linux/sound/soc/soc-dapm.c
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   1/*
   2 * soc-dapm.c  --  ALSA SoC Dynamic Audio Power Management
   3 *
   4 * Copyright 2005 Wolfson Microelectronics PLC.
   5 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   6 *
   7 *  This program is free software; you can redistribute  it and/or modify it
   8 *  under  the terms of  the GNU General  Public License as published by the
   9 *  Free Software Foundation;  either version 2 of the  License, or (at your
  10 *  option) any later version.
  11 *
  12 *  Features:
  13 *    o Changes power status of internal codec blocks depending on the
  14 *      dynamic configuration of codec internal audio paths and active
  15 *      DACs/ADCs.
  16 *    o Platform power domain - can support external components i.e. amps and
  17 *      mic/headphone insertion events.
  18 *    o Automatic Mic Bias support
  19 *    o Jack insertion power event initiation - e.g. hp insertion will enable
  20 *      sinks, dacs, etc
  21 *    o Delayed power down of audio subsystem to reduce pops between a quick
  22 *      device reopen.
  23 *
  24 */
  25
  26#include <linux/module.h>
  27#include <linux/moduleparam.h>
  28#include <linux/init.h>
  29#include <linux/async.h>
  30#include <linux/delay.h>
  31#include <linux/pm.h>
  32#include <linux/bitops.h>
  33#include <linux/platform_device.h>
  34#include <linux/jiffies.h>
  35#include <linux/debugfs.h>
  36#include <linux/pm_runtime.h>
  37#include <linux/regulator/consumer.h>
  38#include <linux/clk.h>
  39#include <linux/slab.h>
  40#include <sound/core.h>
  41#include <sound/pcm.h>
  42#include <sound/pcm_params.h>
  43#include <sound/soc.h>
  44#include <sound/initval.h>
  45
  46#include <trace/events/asoc.h>
  47
  48#define DAPM_UPDATE_STAT(widget, val) widget->dapm->card->dapm_stats.val++;
  49
  50/* dapm power sequences - make this per codec in the future */
  51static int dapm_up_seq[] = {
  52        [snd_soc_dapm_pre] = 0,
  53        [snd_soc_dapm_supply] = 1,
  54        [snd_soc_dapm_regulator_supply] = 1,
  55        [snd_soc_dapm_clock_supply] = 1,
  56        [snd_soc_dapm_micbias] = 2,
  57        [snd_soc_dapm_dai_link] = 2,
  58        [snd_soc_dapm_dai] = 3,
  59        [snd_soc_dapm_aif_in] = 3,
  60        [snd_soc_dapm_aif_out] = 3,
  61        [snd_soc_dapm_mic] = 4,
  62        [snd_soc_dapm_mux] = 5,
  63        [snd_soc_dapm_virt_mux] = 5,
  64        [snd_soc_dapm_value_mux] = 5,
  65        [snd_soc_dapm_dac] = 6,
  66        [snd_soc_dapm_mixer] = 7,
  67        [snd_soc_dapm_mixer_named_ctl] = 7,
  68        [snd_soc_dapm_pga] = 8,
  69        [snd_soc_dapm_adc] = 9,
  70        [snd_soc_dapm_out_drv] = 10,
  71        [snd_soc_dapm_hp] = 10,
  72        [snd_soc_dapm_spk] = 10,
  73        [snd_soc_dapm_line] = 10,
  74        [snd_soc_dapm_post] = 11,
  75};
  76
  77static int dapm_down_seq[] = {
  78        [snd_soc_dapm_pre] = 0,
  79        [snd_soc_dapm_adc] = 1,
  80        [snd_soc_dapm_hp] = 2,
  81        [snd_soc_dapm_spk] = 2,
  82        [snd_soc_dapm_line] = 2,
  83        [snd_soc_dapm_out_drv] = 2,
  84        [snd_soc_dapm_pga] = 4,
  85        [snd_soc_dapm_mixer_named_ctl] = 5,
  86        [snd_soc_dapm_mixer] = 5,
  87        [snd_soc_dapm_dac] = 6,
  88        [snd_soc_dapm_mic] = 7,
  89        [snd_soc_dapm_micbias] = 8,
  90        [snd_soc_dapm_mux] = 9,
  91        [snd_soc_dapm_virt_mux] = 9,
  92        [snd_soc_dapm_value_mux] = 9,
  93        [snd_soc_dapm_aif_in] = 10,
  94        [snd_soc_dapm_aif_out] = 10,
  95        [snd_soc_dapm_dai] = 10,
  96        [snd_soc_dapm_dai_link] = 11,
  97        [snd_soc_dapm_clock_supply] = 12,
  98        [snd_soc_dapm_regulator_supply] = 12,
  99        [snd_soc_dapm_supply] = 12,
 100        [snd_soc_dapm_post] = 13,
 101};
 102
 103static void pop_wait(u32 pop_time)
 104{
 105        if (pop_time)
 106                schedule_timeout_uninterruptible(msecs_to_jiffies(pop_time));
 107}
 108
 109static void pop_dbg(struct device *dev, u32 pop_time, const char *fmt, ...)
 110{
 111        va_list args;
 112        char *buf;
 113
 114        if (!pop_time)
 115                return;
 116
 117        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 118        if (buf == NULL)
 119                return;
 120
 121        va_start(args, fmt);
 122        vsnprintf(buf, PAGE_SIZE, fmt, args);
 123        dev_info(dev, "%s", buf);
 124        va_end(args);
 125
 126        kfree(buf);
 127}
 128
 129static bool dapm_dirty_widget(struct snd_soc_dapm_widget *w)
 130{
 131        return !list_empty(&w->dirty);
 132}
 133
 134void dapm_mark_dirty(struct snd_soc_dapm_widget *w, const char *reason)
 135{
 136        if (!dapm_dirty_widget(w)) {
 137                dev_vdbg(w->dapm->dev, "Marking %s dirty due to %s\n",
 138                         w->name, reason);
 139                list_add_tail(&w->dirty, &w->dapm->card->dapm_dirty);
 140        }
 141}
 142EXPORT_SYMBOL_GPL(dapm_mark_dirty);
 143
 144void dapm_mark_io_dirty(struct snd_soc_dapm_context *dapm)
 145{
 146        struct snd_soc_card *card = dapm->card;
 147        struct snd_soc_dapm_widget *w;
 148
 149        mutex_lock(&card->dapm_mutex);
 150
 151        list_for_each_entry(w, &card->widgets, list) {
 152                switch (w->id) {
 153                case snd_soc_dapm_input:
 154                case snd_soc_dapm_output:
 155                        dapm_mark_dirty(w, "Rechecking inputs and outputs");
 156                        break;
 157                default:
 158                        break;
 159                }
 160        }
 161
 162        mutex_unlock(&card->dapm_mutex);
 163}
 164EXPORT_SYMBOL_GPL(dapm_mark_io_dirty);
 165
 166/* create a new dapm widget */
 167static inline struct snd_soc_dapm_widget *dapm_cnew_widget(
 168        const struct snd_soc_dapm_widget *_widget)
 169{
 170        return kmemdup(_widget, sizeof(*_widget), GFP_KERNEL);
 171}
 172
 173/* get snd_card from DAPM context */
 174static inline struct snd_card *dapm_get_snd_card(
 175        struct snd_soc_dapm_context *dapm)
 176{
 177        if (dapm->codec)
 178                return dapm->codec->card->snd_card;
 179        else if (dapm->platform)
 180                return dapm->platform->card->snd_card;
 181        else
 182                BUG();
 183
 184        /* unreachable */
 185        return NULL;
 186}
 187
 188/* get soc_card from DAPM context */
 189static inline struct snd_soc_card *dapm_get_soc_card(
 190                struct snd_soc_dapm_context *dapm)
 191{
 192        if (dapm->codec)
 193                return dapm->codec->card;
 194        else if (dapm->platform)
 195                return dapm->platform->card;
 196        else
 197                BUG();
 198
 199        /* unreachable */
 200        return NULL;
 201}
 202
 203static void dapm_reset(struct snd_soc_card *card)
 204{
 205        struct snd_soc_dapm_widget *w;
 206
 207        memset(&card->dapm_stats, 0, sizeof(card->dapm_stats));
 208
 209        list_for_each_entry(w, &card->widgets, list) {
 210                w->power_checked = false;
 211                w->inputs = -1;
 212                w->outputs = -1;
 213        }
 214}
 215
 216static int soc_widget_read(struct snd_soc_dapm_widget *w, int reg)
 217{
 218        if (w->codec)
 219                return snd_soc_read(w->codec, reg);
 220        else if (w->platform)
 221                return snd_soc_platform_read(w->platform, reg);
 222
 223        dev_err(w->dapm->dev, "no valid widget read method\n");
 224        return -1;
 225}
 226
 227static int soc_widget_write(struct snd_soc_dapm_widget *w, int reg, int val)
 228{
 229        if (w->codec)
 230                return snd_soc_write(w->codec, reg, val);
 231        else if (w->platform)
 232                return snd_soc_platform_write(w->platform, reg, val);
 233
 234        dev_err(w->dapm->dev, "no valid widget write method\n");
 235        return -1;
 236}
 237
 238static inline void soc_widget_lock(struct snd_soc_dapm_widget *w)
 239{
 240        if (w->codec && !w->codec->using_regmap)
 241                mutex_lock(&w->codec->mutex);
 242        else if (w->platform)
 243                mutex_lock(&w->platform->mutex);
 244}
 245
 246static inline void soc_widget_unlock(struct snd_soc_dapm_widget *w)
 247{
 248        if (w->codec && !w->codec->using_regmap)
 249                mutex_unlock(&w->codec->mutex);
 250        else if (w->platform)
 251                mutex_unlock(&w->platform->mutex);
 252}
 253
 254static int soc_widget_update_bits_locked(struct snd_soc_dapm_widget *w,
 255        unsigned short reg, unsigned int mask, unsigned int value)
 256{
 257        bool change;
 258        unsigned int old, new;
 259        int ret;
 260
 261        if (w->codec && w->codec->using_regmap) {
 262                ret = regmap_update_bits_check(w->codec->control_data,
 263                                               reg, mask, value, &change);
 264                if (ret != 0)
 265                        return ret;
 266        } else {
 267                soc_widget_lock(w);
 268                ret = soc_widget_read(w, reg);
 269                if (ret < 0) {
 270                        soc_widget_unlock(w);
 271                        return ret;
 272                }
 273
 274                old = ret;
 275                new = (old & ~mask) | (value & mask);
 276                change = old != new;
 277                if (change) {
 278                        ret = soc_widget_write(w, reg, new);
 279                        if (ret < 0) {
 280                                soc_widget_unlock(w);
 281                                return ret;
 282                        }
 283                }
 284                soc_widget_unlock(w);
 285        }
 286
 287        return change;
 288}
 289
 290/**
 291 * snd_soc_dapm_set_bias_level - set the bias level for the system
 292 * @dapm: DAPM context
 293 * @level: level to configure
 294 *
 295 * Configure the bias (power) levels for the SoC audio device.
 296 *
 297 * Returns 0 for success else error.
 298 */
 299static int snd_soc_dapm_set_bias_level(struct snd_soc_dapm_context *dapm,
 300                                       enum snd_soc_bias_level level)
 301{
 302        struct snd_soc_card *card = dapm->card;
 303        int ret = 0;
 304
 305        trace_snd_soc_bias_level_start(card, level);
 306
 307        if (card && card->set_bias_level)
 308                ret = card->set_bias_level(card, dapm, level);
 309        if (ret != 0)
 310                goto out;
 311
 312        if (dapm->codec) {
 313                if (dapm->codec->driver->set_bias_level)
 314                        ret = dapm->codec->driver->set_bias_level(dapm->codec,
 315                                                                  level);
 316                else
 317                        dapm->bias_level = level;
 318        } else if (!card || dapm != &card->dapm) {
 319                dapm->bias_level = level;
 320        }
 321
 322        if (ret != 0)
 323                goto out;
 324
 325        if (card && card->set_bias_level_post)
 326                ret = card->set_bias_level_post(card, dapm, level);
 327out:
 328        trace_snd_soc_bias_level_done(card, level);
 329
 330        return ret;
 331}
 332
 333/* set up initial codec paths */
 334static void dapm_set_path_status(struct snd_soc_dapm_widget *w,
 335        struct snd_soc_dapm_path *p, int i)
 336{
 337        switch (w->id) {
 338        case snd_soc_dapm_switch:
 339        case snd_soc_dapm_mixer:
 340        case snd_soc_dapm_mixer_named_ctl: {
 341                int val;
 342                struct soc_mixer_control *mc = (struct soc_mixer_control *)
 343                        w->kcontrol_news[i].private_value;
 344                unsigned int reg = mc->reg;
 345                unsigned int shift = mc->shift;
 346                int max = mc->max;
 347                unsigned int mask = (1 << fls(max)) - 1;
 348                unsigned int invert = mc->invert;
 349
 350                val = soc_widget_read(w, reg);
 351                val = (val >> shift) & mask;
 352                if (invert)
 353                        val = max - val;
 354
 355                p->connect = !!val;
 356        }
 357        break;
 358        case snd_soc_dapm_mux: {
 359                struct soc_enum *e = (struct soc_enum *)
 360                        w->kcontrol_news[i].private_value;
 361                int val, item;
 362
 363                val = soc_widget_read(w, e->reg);
 364                item = (val >> e->shift_l) & e->mask;
 365
 366                p->connect = 0;
 367                for (i = 0; i < e->max; i++) {
 368                        if (!(strcmp(p->name, e->texts[i])) && item == i)
 369                                p->connect = 1;
 370                }
 371        }
 372        break;
 373        case snd_soc_dapm_virt_mux: {
 374                struct soc_enum *e = (struct soc_enum *)
 375                        w->kcontrol_news[i].private_value;
 376
 377                p->connect = 0;
 378                /* since a virtual mux has no backing registers to
 379                 * decide which path to connect, it will try to match
 380                 * with the first enumeration.  This is to ensure
 381                 * that the default mux choice (the first) will be
 382                 * correctly powered up during initialization.
 383                 */
 384                if (!strcmp(p->name, e->texts[0]))
 385                        p->connect = 1;
 386        }
 387        break;
 388        case snd_soc_dapm_value_mux: {
 389                struct soc_enum *e = (struct soc_enum *)
 390                        w->kcontrol_news[i].private_value;
 391                int val, item;
 392
 393                val = soc_widget_read(w, e->reg);
 394                val = (val >> e->shift_l) & e->mask;
 395                for (item = 0; item < e->max; item++) {
 396                        if (val == e->values[item])
 397                                break;
 398                }
 399
 400                p->connect = 0;
 401                for (i = 0; i < e->max; i++) {
 402                        if (!(strcmp(p->name, e->texts[i])) && item == i)
 403                                p->connect = 1;
 404                }
 405        }
 406        break;
 407        /* does not affect routing - always connected */
 408        case snd_soc_dapm_pga:
 409        case snd_soc_dapm_out_drv:
 410        case snd_soc_dapm_output:
 411        case snd_soc_dapm_adc:
 412        case snd_soc_dapm_input:
 413        case snd_soc_dapm_siggen:
 414        case snd_soc_dapm_dac:
 415        case snd_soc_dapm_micbias:
 416        case snd_soc_dapm_vmid:
 417        case snd_soc_dapm_supply:
 418        case snd_soc_dapm_regulator_supply:
 419        case snd_soc_dapm_clock_supply:
 420        case snd_soc_dapm_aif_in:
 421        case snd_soc_dapm_aif_out:
 422        case snd_soc_dapm_dai:
 423        case snd_soc_dapm_hp:
 424        case snd_soc_dapm_mic:
 425        case snd_soc_dapm_spk:
 426        case snd_soc_dapm_line:
 427        case snd_soc_dapm_dai_link:
 428                p->connect = 1;
 429        break;
 430        /* does affect routing - dynamically connected */
 431        case snd_soc_dapm_pre:
 432        case snd_soc_dapm_post:
 433                p->connect = 0;
 434        break;
 435        }
 436}
 437
 438/* connect mux widget to its interconnecting audio paths */
 439static int dapm_connect_mux(struct snd_soc_dapm_context *dapm,
 440        struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
 441        struct snd_soc_dapm_path *path, const char *control_name,
 442        const struct snd_kcontrol_new *kcontrol)
 443{
 444        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 445        int i;
 446
 447        for (i = 0; i < e->max; i++) {
 448                if (!(strcmp(control_name, e->texts[i]))) {
 449                        list_add(&path->list, &dapm->card->paths);
 450                        list_add(&path->list_sink, &dest->sources);
 451                        list_add(&path->list_source, &src->sinks);
 452                        path->name = (char*)e->texts[i];
 453                        dapm_set_path_status(dest, path, 0);
 454                        return 0;
 455                }
 456        }
 457
 458        return -ENODEV;
 459}
 460
 461/* connect mixer widget to its interconnecting audio paths */
 462static int dapm_connect_mixer(struct snd_soc_dapm_context *dapm,
 463        struct snd_soc_dapm_widget *src, struct snd_soc_dapm_widget *dest,
 464        struct snd_soc_dapm_path *path, const char *control_name)
 465{
 466        int i;
 467
 468        /* search for mixer kcontrol */
 469        for (i = 0; i < dest->num_kcontrols; i++) {
 470                if (!strcmp(control_name, dest->kcontrol_news[i].name)) {
 471                        list_add(&path->list, &dapm->card->paths);
 472                        list_add(&path->list_sink, &dest->sources);
 473                        list_add(&path->list_source, &src->sinks);
 474                        path->name = dest->kcontrol_news[i].name;
 475                        dapm_set_path_status(dest, path, i);
 476                        return 0;
 477                }
 478        }
 479        return -ENODEV;
 480}
 481
 482static int dapm_is_shared_kcontrol(struct snd_soc_dapm_context *dapm,
 483        struct snd_soc_dapm_widget *kcontrolw,
 484        const struct snd_kcontrol_new *kcontrol_new,
 485        struct snd_kcontrol **kcontrol)
 486{
 487        struct snd_soc_dapm_widget *w;
 488        int i;
 489
 490        *kcontrol = NULL;
 491
 492        list_for_each_entry(w, &dapm->card->widgets, list) {
 493                if (w == kcontrolw || w->dapm != kcontrolw->dapm)
 494                        continue;
 495                for (i = 0; i < w->num_kcontrols; i++) {
 496                        if (&w->kcontrol_news[i] == kcontrol_new) {
 497                                if (w->kcontrols)
 498                                        *kcontrol = w->kcontrols[i];
 499                                return 1;
 500                        }
 501                }
 502        }
 503
 504        return 0;
 505}
 506
 507/* create new dapm mixer control */
 508static int dapm_new_mixer(struct snd_soc_dapm_widget *w)
 509{
 510        struct snd_soc_dapm_context *dapm = w->dapm;
 511        int i, ret = 0;
 512        size_t name_len, prefix_len;
 513        struct snd_soc_dapm_path *path;
 514        struct snd_card *card = dapm->card->snd_card;
 515        const char *prefix;
 516        struct snd_soc_dapm_widget_list *wlist;
 517        size_t wlistsize;
 518
 519        if (dapm->codec)
 520                prefix = dapm->codec->name_prefix;
 521        else
 522                prefix = NULL;
 523
 524        if (prefix)
 525                prefix_len = strlen(prefix) + 1;
 526        else
 527                prefix_len = 0;
 528
 529        /* add kcontrol */
 530        for (i = 0; i < w->num_kcontrols; i++) {
 531
 532                /* match name */
 533                list_for_each_entry(path, &w->sources, list_sink) {
 534
 535                        /* mixer/mux paths name must match control name */
 536                        if (path->name != (char *)w->kcontrol_news[i].name)
 537                                continue;
 538
 539                        if (w->kcontrols[i]) {
 540                                path->kcontrol = w->kcontrols[i];
 541                                continue;
 542                        }
 543
 544                        wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
 545                                    sizeof(struct snd_soc_dapm_widget *),
 546                        wlist = kzalloc(wlistsize, GFP_KERNEL);
 547                        if (wlist == NULL) {
 548                                dev_err(dapm->dev,
 549                                        "asoc: can't allocate widget list for %s\n",
 550                                        w->name);
 551                                return -ENOMEM;
 552                        }
 553                        wlist->num_widgets = 1;
 554                        wlist->widgets[0] = w;
 555
 556                        /* add dapm control with long name.
 557                         * for dapm_mixer this is the concatenation of the
 558                         * mixer and kcontrol name.
 559                         * for dapm_mixer_named_ctl this is simply the
 560                         * kcontrol name.
 561                         */
 562                        name_len = strlen(w->kcontrol_news[i].name) + 1;
 563                        if (w->id != snd_soc_dapm_mixer_named_ctl)
 564                                name_len += 1 + strlen(w->name);
 565
 566                        path->long_name = kmalloc(name_len, GFP_KERNEL);
 567
 568                        if (path->long_name == NULL) {
 569                                kfree(wlist);
 570                                return -ENOMEM;
 571                        }
 572
 573                        switch (w->id) {
 574                        default:
 575                                /* The control will get a prefix from
 576                                 * the control creation process but
 577                                 * we're also using the same prefix
 578                                 * for widgets so cut the prefix off
 579                                 * the front of the widget name.
 580                                 */
 581                                snprintf((char *)path->long_name, name_len,
 582                                         "%s %s", w->name + prefix_len,
 583                                         w->kcontrol_news[i].name);
 584                                break;
 585                        case snd_soc_dapm_mixer_named_ctl:
 586                                snprintf((char *)path->long_name, name_len,
 587                                         "%s", w->kcontrol_news[i].name);
 588                                break;
 589                        }
 590
 591                        ((char *)path->long_name)[name_len - 1] = '\0';
 592
 593                        path->kcontrol = snd_soc_cnew(&w->kcontrol_news[i],
 594                                                      wlist, path->long_name,
 595                                                      prefix);
 596                        ret = snd_ctl_add(card, path->kcontrol);
 597                        if (ret < 0) {
 598                                dev_err(dapm->dev,
 599                                        "asoc: failed to add dapm kcontrol %s: %d\n",
 600                                        path->long_name, ret);
 601                                kfree(wlist);
 602                                kfree(path->long_name);
 603                                path->long_name = NULL;
 604                                return ret;
 605                        }
 606                        w->kcontrols[i] = path->kcontrol;
 607                }
 608        }
 609        return ret;
 610}
 611
 612/* create new dapm mux control */
 613static int dapm_new_mux(struct snd_soc_dapm_widget *w)
 614{
 615        struct snd_soc_dapm_context *dapm = w->dapm;
 616        struct snd_soc_dapm_path *path = NULL;
 617        struct snd_kcontrol *kcontrol;
 618        struct snd_card *card = dapm->card->snd_card;
 619        const char *prefix;
 620        size_t prefix_len;
 621        int ret;
 622        struct snd_soc_dapm_widget_list *wlist;
 623        int shared, wlistentries;
 624        size_t wlistsize;
 625        const char *name;
 626
 627        if (w->num_kcontrols != 1) {
 628                dev_err(dapm->dev,
 629                        "asoc: mux %s has incorrect number of controls\n",
 630                        w->name);
 631                return -EINVAL;
 632        }
 633
 634        shared = dapm_is_shared_kcontrol(dapm, w, &w->kcontrol_news[0],
 635                                         &kcontrol);
 636        if (kcontrol) {
 637                wlist = kcontrol->private_data;
 638                wlistentries = wlist->num_widgets + 1;
 639        } else {
 640                wlist = NULL;
 641                wlistentries = 1;
 642        }
 643        wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
 644                wlistentries * sizeof(struct snd_soc_dapm_widget *),
 645        wlist = krealloc(wlist, wlistsize, GFP_KERNEL);
 646        if (wlist == NULL) {
 647                dev_err(dapm->dev,
 648                        "asoc: can't allocate widget list for %s\n", w->name);
 649                return -ENOMEM;
 650        }
 651        wlist->num_widgets = wlistentries;
 652        wlist->widgets[wlistentries - 1] = w;
 653
 654        if (!kcontrol) {
 655                if (dapm->codec)
 656                        prefix = dapm->codec->name_prefix;
 657                else
 658                        prefix = NULL;
 659
 660                if (shared) {
 661                        name = w->kcontrol_news[0].name;
 662                        prefix_len = 0;
 663                } else {
 664                        name = w->name;
 665                        if (prefix)
 666                                prefix_len = strlen(prefix) + 1;
 667                        else
 668                                prefix_len = 0;
 669                }
 670
 671                /*
 672                 * The control will get a prefix from the control creation
 673                 * process but we're also using the same prefix for widgets so
 674                 * cut the prefix off the front of the widget name.
 675                 */
 676                kcontrol = snd_soc_cnew(&w->kcontrol_news[0], wlist,
 677                                        name + prefix_len, prefix);
 678                ret = snd_ctl_add(card, kcontrol);
 679                if (ret < 0) {
 680                        dev_err(dapm->dev, "failed to add kcontrol %s: %d\n",
 681                                w->name, ret);
 682                        kfree(wlist);
 683                        return ret;
 684                }
 685        }
 686
 687        kcontrol->private_data = wlist;
 688
 689        w->kcontrols[0] = kcontrol;
 690
 691        list_for_each_entry(path, &w->sources, list_sink)
 692                path->kcontrol = kcontrol;
 693
 694        return 0;
 695}
 696
 697/* create new dapm volume control */
 698static int dapm_new_pga(struct snd_soc_dapm_widget *w)
 699{
 700        if (w->num_kcontrols)
 701                dev_err(w->dapm->dev,
 702                        "asoc: PGA controls not supported: '%s'\n", w->name);
 703
 704        return 0;
 705}
 706
 707/* reset 'walked' bit for each dapm path */
 708static inline void dapm_clear_walk(struct snd_soc_dapm_context *dapm)
 709{
 710        struct snd_soc_dapm_path *p;
 711
 712        list_for_each_entry(p, &dapm->card->paths, list)
 713                p->walked = 0;
 714}
 715
 716/* We implement power down on suspend by checking the power state of
 717 * the ALSA card - when we are suspending the ALSA state for the card
 718 * is set to D3.
 719 */
 720static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget)
 721{
 722        int level = snd_power_get_state(widget->dapm->card->snd_card);
 723
 724        switch (level) {
 725        case SNDRV_CTL_POWER_D3hot:
 726        case SNDRV_CTL_POWER_D3cold:
 727                if (widget->ignore_suspend)
 728                        dev_dbg(widget->dapm->dev, "%s ignoring suspend\n",
 729                                widget->name);
 730                return widget->ignore_suspend;
 731        default:
 732                return 1;
 733        }
 734}
 735
 736/* add widget to list if it's not already in the list */
 737static int dapm_list_add_widget(struct snd_soc_dapm_widget_list **list,
 738        struct snd_soc_dapm_widget *w)
 739{
 740        struct snd_soc_dapm_widget_list *wlist;
 741        int wlistsize, wlistentries, i;
 742
 743        if (*list == NULL)
 744                return -EINVAL;
 745
 746        wlist = *list;
 747
 748        /* is this widget already in the list */
 749        for (i = 0; i < wlist->num_widgets; i++) {
 750                if (wlist->widgets[i] == w)
 751                        return 0;
 752        }
 753
 754        /* allocate some new space */
 755        wlistentries = wlist->num_widgets + 1;
 756        wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
 757                        wlistentries * sizeof(struct snd_soc_dapm_widget *);
 758        *list = krealloc(wlist, wlistsize, GFP_KERNEL);
 759        if (*list == NULL) {
 760                dev_err(w->dapm->dev, "can't allocate widget list for %s\n",
 761                        w->name);
 762                return -ENOMEM;
 763        }
 764        wlist = *list;
 765
 766        /* insert the widget */
 767        dev_dbg(w->dapm->dev, "added %s in widget list pos %d\n",
 768                        w->name, wlist->num_widgets);
 769
 770        wlist->widgets[wlist->num_widgets] = w;
 771        wlist->num_widgets++;
 772        return 1;
 773}
 774
 775/*
 776 * Recursively check for a completed path to an active or physically connected
 777 * output widget. Returns number of complete paths.
 778 */
 779static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
 780        struct snd_soc_dapm_widget_list **list)
 781{
 782        struct snd_soc_dapm_path *path;
 783        int con = 0;
 784
 785        if (widget->outputs >= 0)
 786                return widget->outputs;
 787
 788        DAPM_UPDATE_STAT(widget, path_checks);
 789
 790        switch (widget->id) {
 791        case snd_soc_dapm_supply:
 792        case snd_soc_dapm_regulator_supply:
 793        case snd_soc_dapm_clock_supply:
 794                return 0;
 795        default:
 796                break;
 797        }
 798
 799        switch (widget->id) {
 800        case snd_soc_dapm_adc:
 801        case snd_soc_dapm_aif_out:
 802        case snd_soc_dapm_dai:
 803                if (widget->active) {
 804                        widget->outputs = snd_soc_dapm_suspend_check(widget);
 805                        return widget->outputs;
 806                }
 807        default:
 808                break;
 809        }
 810
 811        if (widget->connected) {
 812                /* connected pin ? */
 813                if (widget->id == snd_soc_dapm_output && !widget->ext) {
 814                        widget->outputs = snd_soc_dapm_suspend_check(widget);
 815                        return widget->outputs;
 816                }
 817
 818                /* connected jack or spk ? */
 819                if (widget->id == snd_soc_dapm_hp ||
 820                    widget->id == snd_soc_dapm_spk ||
 821                    (widget->id == snd_soc_dapm_line &&
 822                     !list_empty(&widget->sources))) {
 823                        widget->outputs = snd_soc_dapm_suspend_check(widget);
 824                        return widget->outputs;
 825                }
 826        }
 827
 828        list_for_each_entry(path, &widget->sinks, list_source) {
 829                DAPM_UPDATE_STAT(widget, neighbour_checks);
 830
 831                if (path->weak)
 832                        continue;
 833
 834                if (path->walked)
 835                        continue;
 836
 837                trace_snd_soc_dapm_output_path(widget, path);
 838
 839                if (path->sink && path->connect) {
 840                        path->walked = 1;
 841
 842                        /* do we need to add this widget to the list ? */
 843                        if (list) {
 844                                int err;
 845                                err = dapm_list_add_widget(list, path->sink);
 846                                if (err < 0) {
 847                                        dev_err(widget->dapm->dev, "could not add widget %s\n",
 848                                                widget->name);
 849                                        return con;
 850                                }
 851                        }
 852
 853                        con += is_connected_output_ep(path->sink, list);
 854                }
 855        }
 856
 857        widget->outputs = con;
 858
 859        return con;
 860}
 861
 862/*
 863 * Recursively check for a completed path to an active or physically connected
 864 * input widget. Returns number of complete paths.
 865 */
 866static int is_connected_input_ep(struct snd_soc_dapm_widget *widget,
 867        struct snd_soc_dapm_widget_list **list)
 868{
 869        struct snd_soc_dapm_path *path;
 870        int con = 0;
 871
 872        if (widget->inputs >= 0)
 873                return widget->inputs;
 874
 875        DAPM_UPDATE_STAT(widget, path_checks);
 876
 877        switch (widget->id) {
 878        case snd_soc_dapm_supply:
 879        case snd_soc_dapm_regulator_supply:
 880        case snd_soc_dapm_clock_supply:
 881                return 0;
 882        default:
 883                break;
 884        }
 885
 886        /* active stream ? */
 887        switch (widget->id) {
 888        case snd_soc_dapm_dac:
 889        case snd_soc_dapm_aif_in:
 890        case snd_soc_dapm_dai:
 891                if (widget->active) {
 892                        widget->inputs = snd_soc_dapm_suspend_check(widget);
 893                        return widget->inputs;
 894                }
 895        default:
 896                break;
 897        }
 898
 899        if (widget->connected) {
 900                /* connected pin ? */
 901                if (widget->id == snd_soc_dapm_input && !widget->ext) {
 902                        widget->inputs = snd_soc_dapm_suspend_check(widget);
 903                        return widget->inputs;
 904                }
 905
 906                /* connected VMID/Bias for lower pops */
 907                if (widget->id == snd_soc_dapm_vmid) {
 908                        widget->inputs = snd_soc_dapm_suspend_check(widget);
 909                        return widget->inputs;
 910                }
 911
 912                /* connected jack ? */
 913                if (widget->id == snd_soc_dapm_mic ||
 914                    (widget->id == snd_soc_dapm_line &&
 915                     !list_empty(&widget->sinks))) {
 916                        widget->inputs = snd_soc_dapm_suspend_check(widget);
 917                        return widget->inputs;
 918                }
 919
 920                /* signal generator */
 921                if (widget->id == snd_soc_dapm_siggen) {
 922                        widget->inputs = snd_soc_dapm_suspend_check(widget);
 923                        return widget->inputs;
 924                }
 925        }
 926
 927        list_for_each_entry(path, &widget->sources, list_sink) {
 928                DAPM_UPDATE_STAT(widget, neighbour_checks);
 929
 930                if (path->weak)
 931                        continue;
 932
 933                if (path->walked)
 934                        continue;
 935
 936                trace_snd_soc_dapm_input_path(widget, path);
 937
 938                if (path->source && path->connect) {
 939                        path->walked = 1;
 940
 941                        /* do we need to add this widget to the list ? */
 942                        if (list) {
 943                                int err;
 944                                err = dapm_list_add_widget(list, path->source);
 945                                if (err < 0) {
 946                                        dev_err(widget->dapm->dev, "could not add widget %s\n",
 947                                                widget->name);
 948                                        return con;
 949                                }
 950                        }
 951
 952                        con += is_connected_input_ep(path->source, list);
 953                }
 954        }
 955
 956        widget->inputs = con;
 957
 958        return con;
 959}
 960
 961/**
 962 * snd_soc_dapm_get_connected_widgets - query audio path and it's widgets.
 963 * @dai: the soc DAI.
 964 * @stream: stream direction.
 965 * @list: list of active widgets for this stream.
 966 *
 967 * Queries DAPM graph as to whether an valid audio stream path exists for
 968 * the initial stream specified by name. This takes into account
 969 * current mixer and mux kcontrol settings. Creates list of valid widgets.
 970 *
 971 * Returns the number of valid paths or negative error.
 972 */
 973int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream,
 974        struct snd_soc_dapm_widget_list **list)
 975{
 976        struct snd_soc_card *card = dai->card;
 977        int paths;
 978
 979        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
 980        dapm_reset(card);
 981
 982        if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 983                paths = is_connected_output_ep(dai->playback_widget, list);
 984        else
 985                paths = is_connected_input_ep(dai->capture_widget, list);
 986
 987        trace_snd_soc_dapm_connected(paths, stream);
 988        dapm_clear_walk(&card->dapm);
 989        mutex_unlock(&card->dapm_mutex);
 990
 991        return paths;
 992}
 993
 994/*
 995 * Handler for generic register modifier widget.
 996 */
 997int dapm_reg_event(struct snd_soc_dapm_widget *w,
 998                   struct snd_kcontrol *kcontrol, int event)
 999{
1000        unsigned int val;
1001
1002        if (SND_SOC_DAPM_EVENT_ON(event))
1003                val = w->on_val;
1004        else
1005                val = w->off_val;
1006
1007        soc_widget_update_bits_locked(w, -(w->reg + 1),
1008                            w->mask << w->shift, val << w->shift);
1009
1010        return 0;
1011}
1012EXPORT_SYMBOL_GPL(dapm_reg_event);
1013
1014/*
1015 * Handler for regulator supply widget.
1016 */
1017int dapm_regulator_event(struct snd_soc_dapm_widget *w,
1018                   struct snd_kcontrol *kcontrol, int event)
1019{
1020        int ret;
1021
1022        if (SND_SOC_DAPM_EVENT_ON(event)) {
1023                if (w->invert & SND_SOC_DAPM_REGULATOR_BYPASS) {
1024                        ret = regulator_allow_bypass(w->regulator, true);
1025                        if (ret != 0)
1026                                dev_warn(w->dapm->dev,
1027                                         "Failed to bypass %s: %d\n",
1028                                         w->name, ret);
1029                }
1030
1031                return regulator_enable(w->regulator);
1032        } else {
1033                if (w->invert & SND_SOC_DAPM_REGULATOR_BYPASS) {
1034                        ret = regulator_allow_bypass(w->regulator, false);
1035                        if (ret != 0)
1036                                dev_warn(w->dapm->dev,
1037                                         "Failed to unbypass %s: %d\n",
1038                                         w->name, ret);
1039                }
1040
1041                return regulator_disable_deferred(w->regulator, w->shift);
1042        }
1043}
1044EXPORT_SYMBOL_GPL(dapm_regulator_event);
1045
1046/*
1047 * Handler for clock supply widget.
1048 */
1049int dapm_clock_event(struct snd_soc_dapm_widget *w,
1050                   struct snd_kcontrol *kcontrol, int event)
1051{
1052        if (!w->clk)
1053                return -EIO;
1054
1055#ifdef CONFIG_HAVE_CLK
1056        if (SND_SOC_DAPM_EVENT_ON(event)) {
1057                return clk_enable(w->clk);
1058        } else {
1059                clk_disable(w->clk);
1060                return 0;
1061        }
1062#endif
1063        return 0;
1064}
1065EXPORT_SYMBOL_GPL(dapm_clock_event);
1066
1067static int dapm_widget_power_check(struct snd_soc_dapm_widget *w)
1068{
1069        if (w->power_checked)
1070                return w->new_power;
1071
1072        if (w->force)
1073                w->new_power = 1;
1074        else
1075                w->new_power = w->power_check(w);
1076
1077        w->power_checked = true;
1078
1079        return w->new_power;
1080}
1081
1082/* Generic check to see if a widget should be powered.
1083 */
1084static int dapm_generic_check_power(struct snd_soc_dapm_widget *w)
1085{
1086        int in, out;
1087
1088        DAPM_UPDATE_STAT(w, power_checks);
1089
1090        in = is_connected_input_ep(w, NULL);
1091        dapm_clear_walk(w->dapm);
1092        out = is_connected_output_ep(w, NULL);
1093        dapm_clear_walk(w->dapm);
1094        return out != 0 && in != 0;
1095}
1096
1097static int dapm_dai_check_power(struct snd_soc_dapm_widget *w)
1098{
1099        DAPM_UPDATE_STAT(w, power_checks);
1100
1101        if (w->active)
1102                return w->active;
1103
1104        return dapm_generic_check_power(w);
1105}
1106
1107/* Check to see if an ADC has power */
1108static int dapm_adc_check_power(struct snd_soc_dapm_widget *w)
1109{
1110        int in;
1111
1112        DAPM_UPDATE_STAT(w, power_checks);
1113
1114        if (w->active) {
1115                in = is_connected_input_ep(w, NULL);
1116                dapm_clear_walk(w->dapm);
1117                return in != 0;
1118        } else {
1119                return dapm_generic_check_power(w);
1120        }
1121}
1122
1123/* Check to see if a DAC has power */
1124static int dapm_dac_check_power(struct snd_soc_dapm_widget *w)
1125{
1126        int out;
1127
1128        DAPM_UPDATE_STAT(w, power_checks);
1129
1130        if (w->active) {
1131                out = is_connected_output_ep(w, NULL);
1132                dapm_clear_walk(w->dapm);
1133                return out != 0;
1134        } else {
1135                return dapm_generic_check_power(w);
1136        }
1137}
1138
1139/* Check to see if a power supply is needed */
1140static int dapm_supply_check_power(struct snd_soc_dapm_widget *w)
1141{
1142        struct snd_soc_dapm_path *path;
1143
1144        DAPM_UPDATE_STAT(w, power_checks);
1145
1146        /* Check if one of our outputs is connected */
1147        list_for_each_entry(path, &w->sinks, list_source) {
1148                DAPM_UPDATE_STAT(w, neighbour_checks);
1149
1150                if (path->weak)
1151                        continue;
1152
1153                if (path->connected &&
1154                    !path->connected(path->source, path->sink))
1155                        continue;
1156
1157                if (!path->sink)
1158                        continue;
1159
1160                if (dapm_widget_power_check(path->sink))
1161                        return 1;
1162        }
1163
1164        dapm_clear_walk(w->dapm);
1165
1166        return 0;
1167}
1168
1169static int dapm_always_on_check_power(struct snd_soc_dapm_widget *w)
1170{
1171        return 1;
1172}
1173
1174static int dapm_seq_compare(struct snd_soc_dapm_widget *a,
1175                            struct snd_soc_dapm_widget *b,
1176                            bool power_up)
1177{
1178        int *sort;
1179
1180        if (power_up)
1181                sort = dapm_up_seq;
1182        else
1183                sort = dapm_down_seq;
1184
1185        if (sort[a->id] != sort[b->id])
1186                return sort[a->id] - sort[b->id];
1187        if (a->subseq != b->subseq) {
1188                if (power_up)
1189                        return a->subseq - b->subseq;
1190                else
1191                        return b->subseq - a->subseq;
1192        }
1193        if (a->reg != b->reg)
1194                return a->reg - b->reg;
1195        if (a->dapm != b->dapm)
1196                return (unsigned long)a->dapm - (unsigned long)b->dapm;
1197
1198        return 0;
1199}
1200
1201/* Insert a widget in order into a DAPM power sequence. */
1202static void dapm_seq_insert(struct snd_soc_dapm_widget *new_widget,
1203                            struct list_head *list,
1204                            bool power_up)
1205{
1206        struct snd_soc_dapm_widget *w;
1207
1208        list_for_each_entry(w, list, power_list)
1209                if (dapm_seq_compare(new_widget, w, power_up) < 0) {
1210                        list_add_tail(&new_widget->power_list, &w->power_list);
1211                        return;
1212                }
1213
1214        list_add_tail(&new_widget->power_list, list);
1215}
1216
1217static void dapm_seq_check_event(struct snd_soc_dapm_context *dapm,
1218                                 struct snd_soc_dapm_widget *w, int event)
1219{
1220        struct snd_soc_card *card = dapm->card;
1221        const char *ev_name;
1222        int power, ret;
1223
1224        switch (event) {
1225        case SND_SOC_DAPM_PRE_PMU:
1226                ev_name = "PRE_PMU";
1227                power = 1;
1228                break;
1229        case SND_SOC_DAPM_POST_PMU:
1230                ev_name = "POST_PMU";
1231                power = 1;
1232                break;
1233        case SND_SOC_DAPM_PRE_PMD:
1234                ev_name = "PRE_PMD";
1235                power = 0;
1236                break;
1237        case SND_SOC_DAPM_POST_PMD:
1238                ev_name = "POST_PMD";
1239                power = 0;
1240                break;
1241        default:
1242                BUG();
1243                return;
1244        }
1245
1246        if (w->power != power)
1247                return;
1248
1249        if (w->event && (w->event_flags & event)) {
1250                pop_dbg(dapm->dev, card->pop_time, "pop test : %s %s\n",
1251                        w->name, ev_name);
1252                trace_snd_soc_dapm_widget_event_start(w, event);
1253                ret = w->event(w, NULL, event);
1254                trace_snd_soc_dapm_widget_event_done(w, event);
1255                if (ret < 0)
1256                        pr_err("%s: %s event failed: %d\n",
1257                               ev_name, w->name, ret);
1258        }
1259}
1260
1261/* Apply the coalesced changes from a DAPM sequence */
1262static void dapm_seq_run_coalesced(struct snd_soc_dapm_context *dapm,
1263                                   struct list_head *pending)
1264{
1265        struct snd_soc_card *card = dapm->card;
1266        struct snd_soc_dapm_widget *w;
1267        int reg, power;
1268        unsigned int value = 0;
1269        unsigned int mask = 0;
1270        unsigned int cur_mask;
1271
1272        reg = list_first_entry(pending, struct snd_soc_dapm_widget,
1273                               power_list)->reg;
1274
1275        list_for_each_entry(w, pending, power_list) {
1276                cur_mask = 1 << w->shift;
1277                BUG_ON(reg != w->reg);
1278
1279                if (w->invert)
1280                        power = !w->power;
1281                else
1282                        power = w->power;
1283
1284                mask |= cur_mask;
1285                if (power)
1286                        value |= cur_mask;
1287
1288                pop_dbg(dapm->dev, card->pop_time,
1289                        "pop test : Queue %s: reg=0x%x, 0x%x/0x%x\n",
1290                        w->name, reg, value, mask);
1291
1292                /* Check for events */
1293                dapm_seq_check_event(dapm, w, SND_SOC_DAPM_PRE_PMU);
1294                dapm_seq_check_event(dapm, w, SND_SOC_DAPM_PRE_PMD);
1295        }
1296
1297        if (reg >= 0) {
1298                /* Any widget will do, they should all be updating the
1299                 * same register.
1300                 */
1301                w = list_first_entry(pending, struct snd_soc_dapm_widget,
1302                                     power_list);
1303
1304                pop_dbg(dapm->dev, card->pop_time,
1305                        "pop test : Applying 0x%x/0x%x to %x in %dms\n",
1306                        value, mask, reg, card->pop_time);
1307                pop_wait(card->pop_time);
1308                soc_widget_update_bits_locked(w, reg, mask, value);
1309        }
1310
1311        list_for_each_entry(w, pending, power_list) {
1312                dapm_seq_check_event(dapm, w, SND_SOC_DAPM_POST_PMU);
1313                dapm_seq_check_event(dapm, w, SND_SOC_DAPM_POST_PMD);
1314        }
1315}
1316
1317/* Apply a DAPM power sequence.
1318 *
1319 * We walk over a pre-sorted list of widgets to apply power to.  In
1320 * order to minimise the number of writes to the device required
1321 * multiple widgets will be updated in a single write where possible.
1322 * Currently anything that requires more than a single write is not
1323 * handled.
1324 */
1325static void dapm_seq_run(struct snd_soc_dapm_context *dapm,
1326                         struct list_head *list, int event, bool power_up)
1327{
1328        struct snd_soc_dapm_widget *w, *n;
1329        LIST_HEAD(pending);
1330        int cur_sort = -1;
1331        int cur_subseq = -1;
1332        int cur_reg = SND_SOC_NOPM;
1333        struct snd_soc_dapm_context *cur_dapm = NULL;
1334        int ret, i;
1335        int *sort;
1336
1337        if (power_up)
1338                sort = dapm_up_seq;
1339        else
1340                sort = dapm_down_seq;
1341
1342        list_for_each_entry_safe(w, n, list, power_list) {
1343                ret = 0;
1344
1345                /* Do we need to apply any queued changes? */
1346                if (sort[w->id] != cur_sort || w->reg != cur_reg ||
1347                    w->dapm != cur_dapm || w->subseq != cur_subseq) {
1348                        if (!list_empty(&pending))
1349                                dapm_seq_run_coalesced(cur_dapm, &pending);
1350
1351                        if (cur_dapm && cur_dapm->seq_notifier) {
1352                                for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
1353                                        if (sort[i] == cur_sort)
1354                                                cur_dapm->seq_notifier(cur_dapm,
1355                                                                       i,
1356                                                                       cur_subseq);
1357                        }
1358
1359                        INIT_LIST_HEAD(&pending);
1360                        cur_sort = -1;
1361                        cur_subseq = INT_MIN;
1362                        cur_reg = SND_SOC_NOPM;
1363                        cur_dapm = NULL;
1364                }
1365
1366                switch (w->id) {
1367                case snd_soc_dapm_pre:
1368                        if (!w->event)
1369                                list_for_each_entry_safe_continue(w, n, list,
1370                                                                  power_list);
1371
1372                        if (event == SND_SOC_DAPM_STREAM_START)
1373                                ret = w->event(w,
1374                                               NULL, SND_SOC_DAPM_PRE_PMU);
1375                        else if (event == SND_SOC_DAPM_STREAM_STOP)
1376                                ret = w->event(w,
1377                                               NULL, SND_SOC_DAPM_PRE_PMD);
1378                        break;
1379
1380                case snd_soc_dapm_post:
1381                        if (!w->event)
1382                                list_for_each_entry_safe_continue(w, n, list,
1383                                                                  power_list);
1384
1385                        if (event == SND_SOC_DAPM_STREAM_START)
1386                                ret = w->event(w,
1387                                               NULL, SND_SOC_DAPM_POST_PMU);
1388                        else if (event == SND_SOC_DAPM_STREAM_STOP)
1389                                ret = w->event(w,
1390                                               NULL, SND_SOC_DAPM_POST_PMD);
1391                        break;
1392
1393                default:
1394                        /* Queue it up for application */
1395                        cur_sort = sort[w->id];
1396                        cur_subseq = w->subseq;
1397                        cur_reg = w->reg;
1398                        cur_dapm = w->dapm;
1399                        list_move(&w->power_list, &pending);
1400                        break;
1401                }
1402
1403                if (ret < 0)
1404                        dev_err(w->dapm->dev,
1405                                "Failed to apply widget power: %d\n", ret);
1406        }
1407
1408        if (!list_empty(&pending))
1409                dapm_seq_run_coalesced(cur_dapm, &pending);
1410
1411        if (cur_dapm && cur_dapm->seq_notifier) {
1412                for (i = 0; i < ARRAY_SIZE(dapm_up_seq); i++)
1413                        if (sort[i] == cur_sort)
1414                                cur_dapm->seq_notifier(cur_dapm,
1415                                                       i, cur_subseq);
1416        }
1417}
1418
1419static void dapm_widget_update(struct snd_soc_dapm_context *dapm)
1420{
1421        struct snd_soc_dapm_update *update = dapm->update;
1422        struct snd_soc_dapm_widget *w;
1423        int ret;
1424
1425        if (!update)
1426                return;
1427
1428        w = update->widget;
1429
1430        if (w->event &&
1431            (w->event_flags & SND_SOC_DAPM_PRE_REG)) {
1432                ret = w->event(w, update->kcontrol, SND_SOC_DAPM_PRE_REG);
1433                if (ret != 0)
1434                        pr_err("%s DAPM pre-event failed: %d\n",
1435                               w->name, ret);
1436        }
1437
1438        ret = soc_widget_update_bits_locked(w, update->reg, update->mask,
1439                                  update->val);
1440        if (ret < 0)
1441                pr_err("%s DAPM update failed: %d\n", w->name, ret);
1442
1443        if (w->event &&
1444            (w->event_flags & SND_SOC_DAPM_POST_REG)) {
1445                ret = w->event(w, update->kcontrol, SND_SOC_DAPM_POST_REG);
1446                if (ret != 0)
1447                        pr_err("%s DAPM post-event failed: %d\n",
1448                               w->name, ret);
1449        }
1450}
1451
1452/* Async callback run prior to DAPM sequences - brings to _PREPARE if
1453 * they're changing state.
1454 */
1455static void dapm_pre_sequence_async(void *data, async_cookie_t cookie)
1456{
1457        struct snd_soc_dapm_context *d = data;
1458        int ret;
1459
1460        /* If we're off and we're not supposed to be go into STANDBY */
1461        if (d->bias_level == SND_SOC_BIAS_OFF &&
1462            d->target_bias_level != SND_SOC_BIAS_OFF) {
1463                if (d->dev)
1464                        pm_runtime_get_sync(d->dev);
1465
1466                ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
1467                if (ret != 0)
1468                        dev_err(d->dev,
1469                                "Failed to turn on bias: %d\n", ret);
1470        }
1471
1472        /* Prepare for a STADDBY->ON or ON->STANDBY transition */
1473        if (d->bias_level != d->target_bias_level) {
1474                ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_PREPARE);
1475                if (ret != 0)
1476                        dev_err(d->dev,
1477                                "Failed to prepare bias: %d\n", ret);
1478        }
1479}
1480
1481/* Async callback run prior to DAPM sequences - brings to their final
1482 * state.
1483 */
1484static void dapm_post_sequence_async(void *data, async_cookie_t cookie)
1485{
1486        struct snd_soc_dapm_context *d = data;
1487        int ret;
1488
1489        /* If we just powered the last thing off drop to standby bias */
1490        if (d->bias_level == SND_SOC_BIAS_PREPARE &&
1491            (d->target_bias_level == SND_SOC_BIAS_STANDBY ||
1492             d->target_bias_level == SND_SOC_BIAS_OFF)) {
1493                ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_STANDBY);
1494                if (ret != 0)
1495                        dev_err(d->dev, "Failed to apply standby bias: %d\n",
1496                                ret);
1497        }
1498
1499        /* If we're in standby and can support bias off then do that */
1500        if (d->bias_level == SND_SOC_BIAS_STANDBY &&
1501            d->target_bias_level == SND_SOC_BIAS_OFF) {
1502                ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_OFF);
1503                if (ret != 0)
1504                        dev_err(d->dev, "Failed to turn off bias: %d\n", ret);
1505
1506                if (d->dev)
1507                        pm_runtime_put(d->dev);
1508        }
1509
1510        /* If we just powered up then move to active bias */
1511        if (d->bias_level == SND_SOC_BIAS_PREPARE &&
1512            d->target_bias_level == SND_SOC_BIAS_ON) {
1513                ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_ON);
1514                if (ret != 0)
1515                        dev_err(d->dev, "Failed to apply active bias: %d\n",
1516                                ret);
1517        }
1518}
1519
1520static void dapm_widget_set_peer_power(struct snd_soc_dapm_widget *peer,
1521                                       bool power, bool connect)
1522{
1523        /* If a connection is being made or broken then that update
1524         * will have marked the peer dirty, otherwise the widgets are
1525         * not connected and this update has no impact. */
1526        if (!connect)
1527                return;
1528
1529        /* If the peer is already in the state we're moving to then we
1530         * won't have an impact on it. */
1531        if (power != peer->power)
1532                dapm_mark_dirty(peer, "peer state change");
1533}
1534
1535static void dapm_widget_set_power(struct snd_soc_dapm_widget *w, bool power,
1536                                  struct list_head *up_list,
1537                                  struct list_head *down_list)
1538{
1539        struct snd_soc_dapm_path *path;
1540
1541        if (w->power == power)
1542                return;
1543
1544        trace_snd_soc_dapm_widget_power(w, power);
1545
1546        /* If we changed our power state perhaps our neigbours changed
1547         * also.
1548         */
1549        list_for_each_entry(path, &w->sources, list_sink) {
1550                if (path->source) {
1551                        dapm_widget_set_peer_power(path->source, power,
1552                                                   path->connect);
1553                }
1554        }
1555        switch (w->id) {
1556        case snd_soc_dapm_supply:
1557        case snd_soc_dapm_regulator_supply:
1558        case snd_soc_dapm_clock_supply:
1559                /* Supplies can't affect their outputs, only their inputs */
1560                break;
1561        default:
1562                list_for_each_entry(path, &w->sinks, list_source) {
1563                        if (path->sink) {
1564                                dapm_widget_set_peer_power(path->sink, power,
1565                                                           path->connect);
1566                        }
1567                }
1568                break;
1569        }
1570
1571        if (power)
1572                dapm_seq_insert(w, up_list, true);
1573        else
1574                dapm_seq_insert(w, down_list, false);
1575
1576        w->power = power;
1577}
1578
1579static void dapm_power_one_widget(struct snd_soc_dapm_widget *w,
1580                                  struct list_head *up_list,
1581                                  struct list_head *down_list)
1582{
1583        int power;
1584
1585        switch (w->id) {
1586        case snd_soc_dapm_pre:
1587                dapm_seq_insert(w, down_list, false);
1588                break;
1589        case snd_soc_dapm_post:
1590                dapm_seq_insert(w, up_list, true);
1591                break;
1592
1593        default:
1594                power = dapm_widget_power_check(w);
1595
1596                dapm_widget_set_power(w, power, up_list, down_list);
1597                break;
1598        }
1599}
1600
1601/*
1602 * Scan each dapm widget for complete audio path.
1603 * A complete path is a route that has valid endpoints i.e.:-
1604 *
1605 *  o DAC to output pin.
1606 *  o Input Pin to ADC.
1607 *  o Input pin to Output pin (bypass, sidetone)
1608 *  o DAC to ADC (loopback).
1609 */
1610static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event)
1611{
1612        struct snd_soc_card *card = dapm->card;
1613        struct snd_soc_dapm_widget *w;
1614        struct snd_soc_dapm_context *d;
1615        LIST_HEAD(up_list);
1616        LIST_HEAD(down_list);
1617        ASYNC_DOMAIN_EXCLUSIVE(async_domain);
1618        enum snd_soc_bias_level bias;
1619
1620        trace_snd_soc_dapm_start(card);
1621
1622        list_for_each_entry(d, &card->dapm_list, list) {
1623                if (d->idle_bias_off)
1624                        d->target_bias_level = SND_SOC_BIAS_OFF;
1625                else
1626                        d->target_bias_level = SND_SOC_BIAS_STANDBY;
1627        }
1628
1629        dapm_reset(card);
1630
1631        /* Check which widgets we need to power and store them in
1632         * lists indicating if they should be powered up or down.  We
1633         * only check widgets that have been flagged as dirty but note
1634         * that new widgets may be added to the dirty list while we
1635         * iterate.
1636         */
1637        list_for_each_entry(w, &card->dapm_dirty, dirty) {
1638                dapm_power_one_widget(w, &up_list, &down_list);
1639        }
1640
1641        list_for_each_entry(w, &card->widgets, list) {
1642                switch (w->id) {
1643                case snd_soc_dapm_pre:
1644                case snd_soc_dapm_post:
1645                        /* These widgets always need to be powered */
1646                        break;
1647                default:
1648                        list_del_init(&w->dirty);
1649                        break;
1650                }
1651
1652                if (w->power) {
1653                        d = w->dapm;
1654
1655                        /* Supplies and micbiases only bring the
1656                         * context up to STANDBY as unless something
1657                         * else is active and passing audio they
1658                         * generally don't require full power.  Signal
1659                         * generators are virtual pins and have no
1660                         * power impact themselves.
1661                         */
1662                        switch (w->id) {
1663                        case snd_soc_dapm_siggen:
1664                                break;
1665                        case snd_soc_dapm_supply:
1666                        case snd_soc_dapm_regulator_supply:
1667                        case snd_soc_dapm_clock_supply:
1668                        case snd_soc_dapm_micbias:
1669                                if (d->target_bias_level < SND_SOC_BIAS_STANDBY)
1670                                        d->target_bias_level = SND_SOC_BIAS_STANDBY;
1671                                break;
1672                        default:
1673                                d->target_bias_level = SND_SOC_BIAS_ON;
1674                                break;
1675                        }
1676                }
1677
1678        }
1679
1680        /* Force all contexts in the card to the same bias state if
1681         * they're not ground referenced.
1682         */
1683        bias = SND_SOC_BIAS_OFF;
1684        list_for_each_entry(d, &card->dapm_list, list)
1685                if (d->target_bias_level > bias)
1686                        bias = d->target_bias_level;
1687        list_for_each_entry(d, &card->dapm_list, list)
1688                if (!d->idle_bias_off)
1689                        d->target_bias_level = bias;
1690
1691        trace_snd_soc_dapm_walk_done(card);
1692
1693        /* Run all the bias changes in parallel */
1694        list_for_each_entry(d, &dapm->card->dapm_list, list)
1695                async_schedule_domain(dapm_pre_sequence_async, d,
1696                                        &async_domain);
1697        async_synchronize_full_domain(&async_domain);
1698
1699        /* Power down widgets first; try to avoid amplifying pops. */
1700        dapm_seq_run(dapm, &down_list, event, false);
1701
1702        dapm_widget_update(dapm);
1703
1704        /* Now power up. */
1705        dapm_seq_run(dapm, &up_list, event, true);
1706
1707        /* Run all the bias changes in parallel */
1708        list_for_each_entry(d, &dapm->card->dapm_list, list)
1709                async_schedule_domain(dapm_post_sequence_async, d,
1710                                        &async_domain);
1711        async_synchronize_full_domain(&async_domain);
1712
1713        /* do we need to notify any clients that DAPM event is complete */
1714        list_for_each_entry(d, &card->dapm_list, list) {
1715                if (d->stream_event)
1716                        d->stream_event(d, event);
1717        }
1718
1719        pop_dbg(dapm->dev, card->pop_time,
1720                "DAPM sequencing finished, waiting %dms\n", card->pop_time);
1721        pop_wait(card->pop_time);
1722
1723        trace_snd_soc_dapm_done(card);
1724
1725        return 0;
1726}
1727
1728#ifdef CONFIG_DEBUG_FS
1729static ssize_t dapm_widget_power_read_file(struct file *file,
1730                                           char __user *user_buf,
1731                                           size_t count, loff_t *ppos)
1732{
1733        struct snd_soc_dapm_widget *w = file->private_data;
1734        char *buf;
1735        int in, out;
1736        ssize_t ret;
1737        struct snd_soc_dapm_path *p = NULL;
1738
1739        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1740        if (!buf)
1741                return -ENOMEM;
1742
1743        in = is_connected_input_ep(w, NULL);
1744        dapm_clear_walk(w->dapm);
1745        out = is_connected_output_ep(w, NULL);
1746        dapm_clear_walk(w->dapm);
1747
1748        ret = snprintf(buf, PAGE_SIZE, "%s: %s%s  in %d out %d",
1749                       w->name, w->power ? "On" : "Off",
1750                       w->force ? " (forced)" : "", in, out);
1751
1752        if (w->reg >= 0)
1753                ret += snprintf(buf + ret, PAGE_SIZE - ret,
1754                                " - R%d(0x%x) bit %d",
1755                                w->reg, w->reg, w->shift);
1756
1757        ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
1758
1759        if (w->sname)
1760                ret += snprintf(buf + ret, PAGE_SIZE - ret, " stream %s %s\n",
1761                                w->sname,
1762                                w->active ? "active" : "inactive");
1763
1764        list_for_each_entry(p, &w->sources, list_sink) {
1765                if (p->connected && !p->connected(w, p->sink))
1766                        continue;
1767
1768                if (p->connect)
1769                        ret += snprintf(buf + ret, PAGE_SIZE - ret,
1770                                        " in  \"%s\" \"%s\"\n",
1771                                        p->name ? p->name : "static",
1772                                        p->source->name);
1773        }
1774        list_for_each_entry(p, &w->sinks, list_source) {
1775                if (p->connected && !p->connected(w, p->sink))
1776                        continue;
1777
1778                if (p->connect)
1779                        ret += snprintf(buf + ret, PAGE_SIZE - ret,
1780                                        " out \"%s\" \"%s\"\n",
1781                                        p->name ? p->name : "static",
1782                                        p->sink->name);
1783        }
1784
1785        ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1786
1787        kfree(buf);
1788        return ret;
1789}
1790
1791static const struct file_operations dapm_widget_power_fops = {
1792        .open = simple_open,
1793        .read = dapm_widget_power_read_file,
1794        .llseek = default_llseek,
1795};
1796
1797static ssize_t dapm_bias_read_file(struct file *file, char __user *user_buf,
1798                                   size_t count, loff_t *ppos)
1799{
1800        struct snd_soc_dapm_context *dapm = file->private_data;
1801        char *level;
1802
1803        switch (dapm->bias_level) {
1804        case SND_SOC_BIAS_ON:
1805                level = "On\n";
1806                break;
1807        case SND_SOC_BIAS_PREPARE:
1808                level = "Prepare\n";
1809                break;
1810        case SND_SOC_BIAS_STANDBY:
1811                level = "Standby\n";
1812                break;
1813        case SND_SOC_BIAS_OFF:
1814                level = "Off\n";
1815                break;
1816        default:
1817                BUG();
1818                level = "Unknown\n";
1819                break;
1820        }
1821
1822        return simple_read_from_buffer(user_buf, count, ppos, level,
1823                                       strlen(level));
1824}
1825
1826static const struct file_operations dapm_bias_fops = {
1827        .open = simple_open,
1828        .read = dapm_bias_read_file,
1829        .llseek = default_llseek,
1830};
1831
1832void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
1833        struct dentry *parent)
1834{
1835        struct dentry *d;
1836
1837        dapm->debugfs_dapm = debugfs_create_dir("dapm", parent);
1838
1839        if (!dapm->debugfs_dapm) {
1840                dev_warn(dapm->dev,
1841                       "Failed to create DAPM debugfs directory\n");
1842                return;
1843        }
1844
1845        d = debugfs_create_file("bias_level", 0444,
1846                                dapm->debugfs_dapm, dapm,
1847                                &dapm_bias_fops);
1848        if (!d)
1849                dev_warn(dapm->dev,
1850                         "ASoC: Failed to create bias level debugfs file\n");
1851}
1852
1853static void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
1854{
1855        struct snd_soc_dapm_context *dapm = w->dapm;
1856        struct dentry *d;
1857
1858        if (!dapm->debugfs_dapm || !w->name)
1859                return;
1860
1861        d = debugfs_create_file(w->name, 0444,
1862                                dapm->debugfs_dapm, w,
1863                                &dapm_widget_power_fops);
1864        if (!d)
1865                dev_warn(w->dapm->dev,
1866                        "ASoC: Failed to create %s debugfs file\n",
1867                        w->name);
1868}
1869
1870static void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
1871{
1872        debugfs_remove_recursive(dapm->debugfs_dapm);
1873}
1874
1875#else
1876void snd_soc_dapm_debugfs_init(struct snd_soc_dapm_context *dapm,
1877        struct dentry *parent)
1878{
1879}
1880
1881static inline void dapm_debugfs_add_widget(struct snd_soc_dapm_widget *w)
1882{
1883}
1884
1885static inline void dapm_debugfs_cleanup(struct snd_soc_dapm_context *dapm)
1886{
1887}
1888
1889#endif
1890
1891/* test and update the power status of a mux widget */
1892static int soc_dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
1893                                 struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e)
1894{
1895        struct snd_soc_dapm_path *path;
1896        int found = 0;
1897
1898        if (widget->id != snd_soc_dapm_mux &&
1899            widget->id != snd_soc_dapm_virt_mux &&
1900            widget->id != snd_soc_dapm_value_mux)
1901                return -ENODEV;
1902
1903        /* find dapm widget path assoc with kcontrol */
1904        list_for_each_entry(path, &widget->dapm->card->paths, list) {
1905                if (path->kcontrol != kcontrol)
1906                        continue;
1907
1908                if (!path->name || !e->texts[mux])
1909                        continue;
1910
1911                found = 1;
1912                /* we now need to match the string in the enum to the path */
1913                if (!(strcmp(path->name, e->texts[mux]))) {
1914                        path->connect = 1; /* new connection */
1915                        dapm_mark_dirty(path->source, "mux connection");
1916                } else {
1917                        if (path->connect)
1918                                dapm_mark_dirty(path->source,
1919                                                "mux disconnection");
1920                        path->connect = 0; /* old connection must be powered down */
1921                }
1922        }
1923
1924        if (found) {
1925                dapm_mark_dirty(widget, "mux change");
1926                dapm_power_widgets(widget->dapm, SND_SOC_DAPM_STREAM_NOP);
1927        }
1928
1929        return found;
1930}
1931
1932int snd_soc_dapm_mux_update_power(struct snd_soc_dapm_widget *widget,
1933                struct snd_kcontrol *kcontrol, int mux, struct soc_enum *e)
1934{
1935        struct snd_soc_card *card = widget->dapm->card;
1936        int ret;
1937
1938        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
1939        ret = soc_dapm_mux_update_power(widget, kcontrol, mux, e);
1940        mutex_unlock(&card->dapm_mutex);
1941        if (ret > 0)
1942                soc_dpcm_runtime_update(widget);
1943        return ret;
1944}
1945EXPORT_SYMBOL_GPL(snd_soc_dapm_mux_update_power);
1946
1947/* test and update the power status of a mixer or switch widget */
1948static int soc_dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
1949                                   struct snd_kcontrol *kcontrol, int connect)
1950{
1951        struct snd_soc_dapm_path *path;
1952        int found = 0;
1953
1954        if (widget->id != snd_soc_dapm_mixer &&
1955            widget->id != snd_soc_dapm_mixer_named_ctl &&
1956            widget->id != snd_soc_dapm_switch)
1957                return -ENODEV;
1958
1959        /* find dapm widget path assoc with kcontrol */
1960        list_for_each_entry(path, &widget->dapm->card->paths, list) {
1961                if (path->kcontrol != kcontrol)
1962                        continue;
1963
1964                /* found, now check type */
1965                found = 1;
1966                path->connect = connect;
1967                dapm_mark_dirty(path->source, "mixer connection");
1968        }
1969
1970        if (found) {
1971                dapm_mark_dirty(widget, "mixer update");
1972                dapm_power_widgets(widget->dapm, SND_SOC_DAPM_STREAM_NOP);
1973        }
1974
1975        return found;
1976}
1977
1978int snd_soc_dapm_mixer_update_power(struct snd_soc_dapm_widget *widget,
1979                                struct snd_kcontrol *kcontrol, int connect)
1980{
1981        struct snd_soc_card *card = widget->dapm->card;
1982        int ret;
1983
1984        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
1985        ret = soc_dapm_mixer_update_power(widget, kcontrol, connect);
1986        mutex_unlock(&card->dapm_mutex);
1987        if (ret > 0)
1988                soc_dpcm_runtime_update(widget);
1989        return ret;
1990}
1991EXPORT_SYMBOL_GPL(snd_soc_dapm_mixer_update_power);
1992
1993/* show dapm widget status in sys fs */
1994static ssize_t dapm_widget_show(struct device *dev,
1995        struct device_attribute *attr, char *buf)
1996{
1997        struct snd_soc_pcm_runtime *rtd = dev_get_drvdata(dev);
1998        struct snd_soc_codec *codec =rtd->codec;
1999        struct snd_soc_dapm_widget *w;
2000        int count = 0;
2001        char *state = "not set";
2002
2003        list_for_each_entry(w, &codec->card->widgets, list) {
2004                if (w->dapm != &codec->dapm)
2005                        continue;
2006
2007                /* only display widgets that burnm power */
2008                switch (w->id) {
2009                case snd_soc_dapm_hp:
2010                case snd_soc_dapm_mic:
2011                case snd_soc_dapm_spk:
2012                case snd_soc_dapm_line:
2013                case snd_soc_dapm_micbias:
2014                case snd_soc_dapm_dac:
2015                case snd_soc_dapm_adc:
2016                case snd_soc_dapm_pga:
2017                case snd_soc_dapm_out_drv:
2018                case snd_soc_dapm_mixer:
2019                case snd_soc_dapm_mixer_named_ctl:
2020                case snd_soc_dapm_supply:
2021                case snd_soc_dapm_regulator_supply:
2022                case snd_soc_dapm_clock_supply:
2023                        if (w->name)
2024                                count += sprintf(buf + count, "%s: %s\n",
2025                                        w->name, w->power ? "On":"Off");
2026                break;
2027                default:
2028                break;
2029                }
2030        }
2031
2032        switch (codec->dapm.bias_level) {
2033        case SND_SOC_BIAS_ON:
2034                state = "On";
2035                break;
2036        case SND_SOC_BIAS_PREPARE:
2037                state = "Prepare";
2038                break;
2039        case SND_SOC_BIAS_STANDBY:
2040                state = "Standby";
2041                break;
2042        case SND_SOC_BIAS_OFF:
2043                state = "Off";
2044                break;
2045        }
2046        count += sprintf(buf + count, "PM State: %s\n", state);
2047
2048        return count;
2049}
2050
2051static DEVICE_ATTR(dapm_widget, 0444, dapm_widget_show, NULL);
2052
2053int snd_soc_dapm_sys_add(struct device *dev)
2054{
2055        return device_create_file(dev, &dev_attr_dapm_widget);
2056}
2057
2058static void snd_soc_dapm_sys_remove(struct device *dev)
2059{
2060        device_remove_file(dev, &dev_attr_dapm_widget);
2061}
2062
2063/* free all dapm widgets and resources */
2064static void dapm_free_widgets(struct snd_soc_dapm_context *dapm)
2065{
2066        struct snd_soc_dapm_widget *w, *next_w;
2067        struct snd_soc_dapm_path *p, *next_p;
2068
2069        list_for_each_entry_safe(w, next_w, &dapm->card->widgets, list) {
2070                if (w->dapm != dapm)
2071                        continue;
2072                list_del(&w->list);
2073                /*
2074                 * remove source and sink paths associated to this widget.
2075                 * While removing the path, remove reference to it from both
2076                 * source and sink widgets so that path is removed only once.
2077                 */
2078                list_for_each_entry_safe(p, next_p, &w->sources, list_sink) {
2079                        list_del(&p->list_sink);
2080                        list_del(&p->list_source);
2081                        list_del(&p->list);
2082                        kfree(p->long_name);
2083                        kfree(p);
2084                }
2085                list_for_each_entry_safe(p, next_p, &w->sinks, list_source) {
2086                        list_del(&p->list_sink);
2087                        list_del(&p->list_source);
2088                        list_del(&p->list);
2089                        kfree(p->long_name);
2090                        kfree(p);
2091                }
2092                kfree(w->kcontrols);
2093                kfree(w->name);
2094                kfree(w);
2095        }
2096}
2097
2098static struct snd_soc_dapm_widget *dapm_find_widget(
2099                        struct snd_soc_dapm_context *dapm, const char *pin,
2100                        bool search_other_contexts)
2101{
2102        struct snd_soc_dapm_widget *w;
2103        struct snd_soc_dapm_widget *fallback = NULL;
2104
2105        list_for_each_entry(w, &dapm->card->widgets, list) {
2106                if (!strcmp(w->name, pin)) {
2107                        if (w->dapm == dapm)
2108                                return w;
2109                        else
2110                                fallback = w;
2111                }
2112        }
2113
2114        if (search_other_contexts)
2115                return fallback;
2116
2117        return NULL;
2118}
2119
2120static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
2121                                const char *pin, int status)
2122{
2123        struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
2124
2125        if (!w) {
2126                dev_err(dapm->dev, "dapm: unknown pin %s\n", pin);
2127                return -EINVAL;
2128        }
2129
2130        if (w->connected != status)
2131                dapm_mark_dirty(w, "pin configuration");
2132
2133        w->connected = status;
2134        if (status == 0)
2135                w->force = 0;
2136
2137        return 0;
2138}
2139
2140/**
2141 * snd_soc_dapm_sync - scan and power dapm paths
2142 * @dapm: DAPM context
2143 *
2144 * Walks all dapm audio paths and powers widgets according to their
2145 * stream or path usage.
2146 *
2147 * Returns 0 for success.
2148 */
2149int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
2150{
2151        int ret;
2152
2153        /*
2154         * Suppress early reports (eg, jacks syncing their state) to avoid
2155         * silly DAPM runs during card startup.
2156         */
2157        if (!dapm->card || !dapm->card->instantiated)
2158                return 0;
2159
2160        mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2161        ret = dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
2162        mutex_unlock(&dapm->card->dapm_mutex);
2163        return ret;
2164}
2165EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);
2166
2167static int snd_soc_dapm_add_route(struct snd_soc_dapm_context *dapm,
2168                                  const struct snd_soc_dapm_route *route)
2169{
2170        struct snd_soc_dapm_path *path;
2171        struct snd_soc_dapm_widget *wsource = NULL, *wsink = NULL, *w;
2172        struct snd_soc_dapm_widget *wtsource = NULL, *wtsink = NULL;
2173        const char *sink;
2174        const char *control = route->control;
2175        const char *source;
2176        char prefixed_sink[80];
2177        char prefixed_source[80];
2178        int ret = 0;
2179
2180        if (dapm->codec && dapm->codec->name_prefix) {
2181                snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
2182                         dapm->codec->name_prefix, route->sink);
2183                sink = prefixed_sink;
2184                snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
2185                         dapm->codec->name_prefix, route->source);
2186                source = prefixed_source;
2187        } else {
2188                sink = route->sink;
2189                source = route->source;
2190        }
2191
2192        /*
2193         * find src and dest widgets over all widgets but favor a widget from
2194         * current DAPM context
2195         */
2196        list_for_each_entry(w, &dapm->card->widgets, list) {
2197                if (!wsink && !(strcmp(w->name, sink))) {
2198                        wtsink = w;
2199                        if (w->dapm == dapm)
2200                                wsink = w;
2201                        continue;
2202                }
2203                if (!wsource && !(strcmp(w->name, source))) {
2204                        wtsource = w;
2205                        if (w->dapm == dapm)
2206                                wsource = w;
2207                }
2208        }
2209        /* use widget from another DAPM context if not found from this */
2210        if (!wsink)
2211                wsink = wtsink;
2212        if (!wsource)
2213                wsource = wtsource;
2214
2215        if (wsource == NULL || wsink == NULL)
2216                return -ENODEV;
2217
2218        path = kzalloc(sizeof(struct snd_soc_dapm_path), GFP_KERNEL);
2219        if (!path)
2220                return -ENOMEM;
2221
2222        path->source = wsource;
2223        path->sink = wsink;
2224        path->connected = route->connected;
2225        INIT_LIST_HEAD(&path->list);
2226        INIT_LIST_HEAD(&path->list_source);
2227        INIT_LIST_HEAD(&path->list_sink);
2228
2229        /* check for external widgets */
2230        if (wsink->id == snd_soc_dapm_input) {
2231                if (wsource->id == snd_soc_dapm_micbias ||
2232                        wsource->id == snd_soc_dapm_mic ||
2233                        wsource->id == snd_soc_dapm_line ||
2234                        wsource->id == snd_soc_dapm_output)
2235                        wsink->ext = 1;
2236        }
2237        if (wsource->id == snd_soc_dapm_output) {
2238                if (wsink->id == snd_soc_dapm_spk ||
2239                        wsink->id == snd_soc_dapm_hp ||
2240                        wsink->id == snd_soc_dapm_line ||
2241                        wsink->id == snd_soc_dapm_input)
2242                        wsource->ext = 1;
2243        }
2244
2245        /* connect static paths */
2246        if (control == NULL) {
2247                list_add(&path->list, &dapm->card->paths);
2248                list_add(&path->list_sink, &wsink->sources);
2249                list_add(&path->list_source, &wsource->sinks);
2250                path->connect = 1;
2251                return 0;
2252        }
2253
2254        /* connect dynamic paths */
2255        switch (wsink->id) {
2256        case snd_soc_dapm_adc:
2257        case snd_soc_dapm_dac:
2258        case snd_soc_dapm_pga:
2259        case snd_soc_dapm_out_drv:
2260        case snd_soc_dapm_input:
2261        case snd_soc_dapm_output:
2262        case snd_soc_dapm_siggen:
2263        case snd_soc_dapm_micbias:
2264        case snd_soc_dapm_vmid:
2265        case snd_soc_dapm_pre:
2266        case snd_soc_dapm_post:
2267        case snd_soc_dapm_supply:
2268        case snd_soc_dapm_regulator_supply:
2269        case snd_soc_dapm_clock_supply:
2270        case snd_soc_dapm_aif_in:
2271        case snd_soc_dapm_aif_out:
2272        case snd_soc_dapm_dai:
2273        case snd_soc_dapm_dai_link:
2274                list_add(&path->list, &dapm->card->paths);
2275                list_add(&path->list_sink, &wsink->sources);
2276                list_add(&path->list_source, &wsource->sinks);
2277                path->connect = 1;
2278                return 0;
2279        case snd_soc_dapm_mux:
2280        case snd_soc_dapm_virt_mux:
2281        case snd_soc_dapm_value_mux:
2282                ret = dapm_connect_mux(dapm, wsource, wsink, path, control,
2283                        &wsink->kcontrol_news[0]);
2284                if (ret != 0)
2285                        goto err;
2286                break;
2287        case snd_soc_dapm_switch:
2288        case snd_soc_dapm_mixer:
2289        case snd_soc_dapm_mixer_named_ctl:
2290                ret = dapm_connect_mixer(dapm, wsource, wsink, path, control);
2291                if (ret != 0)
2292                        goto err;
2293                break;
2294        case snd_soc_dapm_hp:
2295        case snd_soc_dapm_mic:
2296        case snd_soc_dapm_line:
2297        case snd_soc_dapm_spk:
2298                list_add(&path->list, &dapm->card->paths);
2299                list_add(&path->list_sink, &wsink->sources);
2300                list_add(&path->list_source, &wsource->sinks);
2301                path->connect = 0;
2302                return 0;
2303        }
2304
2305        dapm_mark_dirty(wsource, "Route added");
2306        dapm_mark_dirty(wsink, "Route added");
2307
2308        return 0;
2309
2310err:
2311        dev_warn(dapm->dev, "asoc: no dapm match for %s --> %s --> %s\n",
2312                 source, control, sink);
2313        kfree(path);
2314        return ret;
2315}
2316
2317static int snd_soc_dapm_del_route(struct snd_soc_dapm_context *dapm,
2318                                  const struct snd_soc_dapm_route *route)
2319{
2320        struct snd_soc_dapm_path *path, *p;
2321        const char *sink;
2322        const char *source;
2323        char prefixed_sink[80];
2324        char prefixed_source[80];
2325
2326        if (route->control) {
2327                dev_err(dapm->dev,
2328                        "Removal of routes with controls not supported\n");
2329                return -EINVAL;
2330        }
2331
2332        if (dapm->codec && dapm->codec->name_prefix) {
2333                snprintf(prefixed_sink, sizeof(prefixed_sink), "%s %s",
2334                         dapm->codec->name_prefix, route->sink);
2335                sink = prefixed_sink;
2336                snprintf(prefixed_source, sizeof(prefixed_source), "%s %s",
2337                         dapm->codec->name_prefix, route->source);
2338                source = prefixed_source;
2339        } else {
2340                sink = route->sink;
2341                source = route->source;
2342        }
2343
2344        path = NULL;
2345        list_for_each_entry(p, &dapm->card->paths, list) {
2346                if (strcmp(p->source->name, source) != 0)
2347                        continue;
2348                if (strcmp(p->sink->name, sink) != 0)
2349                        continue;
2350                path = p;
2351                break;
2352        }
2353
2354        if (path) {
2355                dapm_mark_dirty(path->source, "Route removed");
2356                dapm_mark_dirty(path->sink, "Route removed");
2357
2358                list_del(&path->list);
2359                list_del(&path->list_sink);
2360                list_del(&path->list_source);
2361                kfree(path);
2362        } else {
2363                dev_warn(dapm->dev, "Route %s->%s does not exist\n",
2364                         source, sink);
2365        }
2366
2367        return 0;
2368}
2369
2370/**
2371 * snd_soc_dapm_add_routes - Add routes between DAPM widgets
2372 * @dapm: DAPM context
2373 * @route: audio routes
2374 * @num: number of routes
2375 *
2376 * Connects 2 dapm widgets together via a named audio path. The sink is
2377 * the widget receiving the audio signal, whilst the source is the sender
2378 * of the audio signal.
2379 *
2380 * Returns 0 for success else error. On error all resources can be freed
2381 * with a call to snd_soc_card_free().
2382 */
2383int snd_soc_dapm_add_routes(struct snd_soc_dapm_context *dapm,
2384                            const struct snd_soc_dapm_route *route, int num)
2385{
2386        int i, r, ret = 0;
2387
2388        mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2389        for (i = 0; i < num; i++) {
2390                r = snd_soc_dapm_add_route(dapm, route);
2391                if (r < 0) {
2392                        dev_err(dapm->dev, "Failed to add route %s->%s\n",
2393                                route->source, route->sink);
2394                        ret = r;
2395                }
2396                route++;
2397        }
2398        mutex_unlock(&dapm->card->dapm_mutex);
2399
2400        return ret;
2401}
2402EXPORT_SYMBOL_GPL(snd_soc_dapm_add_routes);
2403
2404/**
2405 * snd_soc_dapm_del_routes - Remove routes between DAPM widgets
2406 * @dapm: DAPM context
2407 * @route: audio routes
2408 * @num: number of routes
2409 *
2410 * Removes routes from the DAPM context.
2411 */
2412int snd_soc_dapm_del_routes(struct snd_soc_dapm_context *dapm,
2413                            const struct snd_soc_dapm_route *route, int num)
2414{
2415        int i, ret = 0;
2416
2417        mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2418        for (i = 0; i < num; i++) {
2419                snd_soc_dapm_del_route(dapm, route);
2420                route++;
2421        }
2422        mutex_unlock(&dapm->card->dapm_mutex);
2423
2424        return ret;
2425}
2426EXPORT_SYMBOL_GPL(snd_soc_dapm_del_routes);
2427
2428static int snd_soc_dapm_weak_route(struct snd_soc_dapm_context *dapm,
2429                                   const struct snd_soc_dapm_route *route)
2430{
2431        struct snd_soc_dapm_widget *source = dapm_find_widget(dapm,
2432                                                              route->source,
2433                                                              true);
2434        struct snd_soc_dapm_widget *sink = dapm_find_widget(dapm,
2435                                                            route->sink,
2436                                                            true);
2437        struct snd_soc_dapm_path *path;
2438        int count = 0;
2439
2440        if (!source) {
2441                dev_err(dapm->dev, "Unable to find source %s for weak route\n",
2442                        route->source);
2443                return -ENODEV;
2444        }
2445
2446        if (!sink) {
2447                dev_err(dapm->dev, "Unable to find sink %s for weak route\n",
2448                        route->sink);
2449                return -ENODEV;
2450        }
2451
2452        if (route->control || route->connected)
2453                dev_warn(dapm->dev, "Ignoring control for weak route %s->%s\n",
2454                         route->source, route->sink);
2455
2456        list_for_each_entry(path, &source->sinks, list_source) {
2457                if (path->sink == sink) {
2458                        path->weak = 1;
2459                        count++;
2460                }
2461        }
2462
2463        if (count == 0)
2464                dev_err(dapm->dev, "No path found for weak route %s->%s\n",
2465                        route->source, route->sink);
2466        if (count > 1)
2467                dev_warn(dapm->dev, "%d paths found for weak route %s->%s\n",
2468                         count, route->source, route->sink);
2469
2470        return 0;
2471}
2472
2473/**
2474 * snd_soc_dapm_weak_routes - Mark routes between DAPM widgets as weak
2475 * @dapm: DAPM context
2476 * @route: audio routes
2477 * @num: number of routes
2478 *
2479 * Mark existing routes matching those specified in the passed array
2480 * as being weak, meaning that they are ignored for the purpose of
2481 * power decisions.  The main intended use case is for sidetone paths
2482 * which couple audio between other independent paths if they are both
2483 * active in order to make the combination work better at the user
2484 * level but which aren't intended to be "used".
2485 *
2486 * Note that CODEC drivers should not use this as sidetone type paths
2487 * can frequently also be used as bypass paths.
2488 */
2489int snd_soc_dapm_weak_routes(struct snd_soc_dapm_context *dapm,
2490                             const struct snd_soc_dapm_route *route, int num)
2491{
2492        int i, err;
2493        int ret = 0;
2494
2495        mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2496        for (i = 0; i < num; i++) {
2497                err = snd_soc_dapm_weak_route(dapm, route);
2498                if (err)
2499                        ret = err;
2500                route++;
2501        }
2502        mutex_unlock(&dapm->card->dapm_mutex);
2503
2504        return ret;
2505}
2506EXPORT_SYMBOL_GPL(snd_soc_dapm_weak_routes);
2507
2508/**
2509 * snd_soc_dapm_new_widgets - add new dapm widgets
2510 * @dapm: DAPM context
2511 *
2512 * Checks the codec for any new dapm widgets and creates them if found.
2513 *
2514 * Returns 0 for success.
2515 */
2516int snd_soc_dapm_new_widgets(struct snd_soc_dapm_context *dapm)
2517{
2518        struct snd_soc_dapm_widget *w;
2519        unsigned int val;
2520
2521        mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
2522
2523        list_for_each_entry(w, &dapm->card->widgets, list)
2524        {
2525                if (w->new)
2526                        continue;
2527
2528                if (w->num_kcontrols) {
2529                        w->kcontrols = kzalloc(w->num_kcontrols *
2530                                                sizeof(struct snd_kcontrol *),
2531                                                GFP_KERNEL);
2532                        if (!w->kcontrols) {
2533                                mutex_unlock(&dapm->card->dapm_mutex);
2534                                return -ENOMEM;
2535                        }
2536                }
2537
2538                switch(w->id) {
2539                case snd_soc_dapm_switch:
2540                case snd_soc_dapm_mixer:
2541                case snd_soc_dapm_mixer_named_ctl:
2542                        dapm_new_mixer(w);
2543                        break;
2544                case snd_soc_dapm_mux:
2545                case snd_soc_dapm_virt_mux:
2546                case snd_soc_dapm_value_mux:
2547                        dapm_new_mux(w);
2548                        break;
2549                case snd_soc_dapm_pga:
2550                case snd_soc_dapm_out_drv:
2551                        dapm_new_pga(w);
2552                        break;
2553                default:
2554                        break;
2555                }
2556
2557                /* Read the initial power state from the device */
2558                if (w->reg >= 0) {
2559                        val = soc_widget_read(w, w->reg);
2560                        val &= 1 << w->shift;
2561                        if (w->invert)
2562                                val = !val;
2563
2564                        if (val)
2565                                w->power = 1;
2566                }
2567
2568                w->new = 1;
2569
2570                dapm_mark_dirty(w, "new widget");
2571                dapm_debugfs_add_widget(w);
2572        }
2573
2574        dapm_power_widgets(dapm, SND_SOC_DAPM_STREAM_NOP);
2575        mutex_unlock(&dapm->card->dapm_mutex);
2576        return 0;
2577}
2578EXPORT_SYMBOL_GPL(snd_soc_dapm_new_widgets);
2579
2580/**
2581 * snd_soc_dapm_get_volsw - dapm mixer get callback
2582 * @kcontrol: mixer control
2583 * @ucontrol: control element information
2584 *
2585 * Callback to get the value of a dapm mixer control.
2586 *
2587 * Returns 0 for success.
2588 */
2589int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol,
2590        struct snd_ctl_elem_value *ucontrol)
2591{
2592        struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2593        struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2594        struct soc_mixer_control *mc =
2595                (struct soc_mixer_control *)kcontrol->private_value;
2596        unsigned int reg = mc->reg;
2597        unsigned int shift = mc->shift;
2598        int max = mc->max;
2599        unsigned int mask = (1 << fls(max)) - 1;
2600        unsigned int invert = mc->invert;
2601
2602        if (snd_soc_volsw_is_stereo(mc))
2603                dev_warn(widget->dapm->dev,
2604                         "Control '%s' is stereo, which is not supported\n",
2605                         kcontrol->id.name);
2606
2607        ucontrol->value.integer.value[0] =
2608                (snd_soc_read(widget->codec, reg) >> shift) & mask;
2609        if (invert)
2610                ucontrol->value.integer.value[0] =
2611                        max - ucontrol->value.integer.value[0];
2612
2613        return 0;
2614}
2615EXPORT_SYMBOL_GPL(snd_soc_dapm_get_volsw);
2616
2617/**
2618 * snd_soc_dapm_put_volsw - dapm mixer set callback
2619 * @kcontrol: mixer control
2620 * @ucontrol: control element information
2621 *
2622 * Callback to set the value of a dapm mixer control.
2623 *
2624 * Returns 0 for success.
2625 */
2626int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
2627        struct snd_ctl_elem_value *ucontrol)
2628{
2629        struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2630        struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2631        struct snd_soc_codec *codec = widget->codec;
2632        struct snd_soc_card *card = codec->card;
2633        struct soc_mixer_control *mc =
2634                (struct soc_mixer_control *)kcontrol->private_value;
2635        unsigned int reg = mc->reg;
2636        unsigned int shift = mc->shift;
2637        int max = mc->max;
2638        unsigned int mask = (1 << fls(max)) - 1;
2639        unsigned int invert = mc->invert;
2640        unsigned int val;
2641        int connect, change;
2642        struct snd_soc_dapm_update update;
2643        int wi;
2644
2645        if (snd_soc_volsw_is_stereo(mc))
2646                dev_warn(widget->dapm->dev,
2647                         "Control '%s' is stereo, which is not supported\n",
2648                         kcontrol->id.name);
2649
2650        val = (ucontrol->value.integer.value[0] & mask);
2651        connect = !!val;
2652
2653        if (invert)
2654                val = max - val;
2655        mask = mask << shift;
2656        val = val << shift;
2657
2658        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2659
2660        change = snd_soc_test_bits(widget->codec, reg, mask, val);
2661        if (change) {
2662                for (wi = 0; wi < wlist->num_widgets; wi++) {
2663                        widget = wlist->widgets[wi];
2664
2665                        widget->value = val;
2666
2667                        update.kcontrol = kcontrol;
2668                        update.widget = widget;
2669                        update.reg = reg;
2670                        update.mask = mask;
2671                        update.val = val;
2672                        widget->dapm->update = &update;
2673
2674                        soc_dapm_mixer_update_power(widget, kcontrol, connect);
2675
2676                        widget->dapm->update = NULL;
2677                }
2678        }
2679
2680        mutex_unlock(&card->dapm_mutex);
2681        return 0;
2682}
2683EXPORT_SYMBOL_GPL(snd_soc_dapm_put_volsw);
2684
2685/**
2686 * snd_soc_dapm_get_enum_double - dapm enumerated double mixer get callback
2687 * @kcontrol: mixer control
2688 * @ucontrol: control element information
2689 *
2690 * Callback to get the value of a dapm enumerated double mixer control.
2691 *
2692 * Returns 0 for success.
2693 */
2694int snd_soc_dapm_get_enum_double(struct snd_kcontrol *kcontrol,
2695        struct snd_ctl_elem_value *ucontrol)
2696{
2697        struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2698        struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2699        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2700        unsigned int val;
2701
2702        val = snd_soc_read(widget->codec, e->reg);
2703        ucontrol->value.enumerated.item[0] = (val >> e->shift_l) & e->mask;
2704        if (e->shift_l != e->shift_r)
2705                ucontrol->value.enumerated.item[1] =
2706                        (val >> e->shift_r) & e->mask;
2707
2708        return 0;
2709}
2710EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_double);
2711
2712/**
2713 * snd_soc_dapm_put_enum_double - dapm enumerated double mixer set callback
2714 * @kcontrol: mixer control
2715 * @ucontrol: control element information
2716 *
2717 * Callback to set the value of a dapm enumerated double mixer control.
2718 *
2719 * Returns 0 for success.
2720 */
2721int snd_soc_dapm_put_enum_double(struct snd_kcontrol *kcontrol,
2722        struct snd_ctl_elem_value *ucontrol)
2723{
2724        struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2725        struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2726        struct snd_soc_codec *codec = widget->codec;
2727        struct snd_soc_card *card = codec->card;
2728        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2729        unsigned int val, mux, change;
2730        unsigned int mask;
2731        struct snd_soc_dapm_update update;
2732        int wi;
2733
2734        if (ucontrol->value.enumerated.item[0] > e->max - 1)
2735                return -EINVAL;
2736        mux = ucontrol->value.enumerated.item[0];
2737        val = mux << e->shift_l;
2738        mask = e->mask << e->shift_l;
2739        if (e->shift_l != e->shift_r) {
2740                if (ucontrol->value.enumerated.item[1] > e->max - 1)
2741                        return -EINVAL;
2742                val |= ucontrol->value.enumerated.item[1] << e->shift_r;
2743                mask |= e->mask << e->shift_r;
2744        }
2745
2746        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2747
2748        change = snd_soc_test_bits(widget->codec, e->reg, mask, val);
2749        if (change) {
2750                for (wi = 0; wi < wlist->num_widgets; wi++) {
2751                        widget = wlist->widgets[wi];
2752
2753                        widget->value = val;
2754
2755                        update.kcontrol = kcontrol;
2756                        update.widget = widget;
2757                        update.reg = e->reg;
2758                        update.mask = mask;
2759                        update.val = val;
2760                        widget->dapm->update = &update;
2761
2762                        soc_dapm_mux_update_power(widget, kcontrol, mux, e);
2763
2764                        widget->dapm->update = NULL;
2765                }
2766        }
2767
2768        mutex_unlock(&card->dapm_mutex);
2769        return change;
2770}
2771EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_double);
2772
2773/**
2774 * snd_soc_dapm_get_enum_virt - Get virtual DAPM mux
2775 * @kcontrol: mixer control
2776 * @ucontrol: control element information
2777 *
2778 * Returns 0 for success.
2779 */
2780int snd_soc_dapm_get_enum_virt(struct snd_kcontrol *kcontrol,
2781                               struct snd_ctl_elem_value *ucontrol)
2782{
2783        struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2784        struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2785
2786        ucontrol->value.enumerated.item[0] = widget->value;
2787
2788        return 0;
2789}
2790EXPORT_SYMBOL_GPL(snd_soc_dapm_get_enum_virt);
2791
2792/**
2793 * snd_soc_dapm_put_enum_virt - Set virtual DAPM mux
2794 * @kcontrol: mixer control
2795 * @ucontrol: control element information
2796 *
2797 * Returns 0 for success.
2798 */
2799int snd_soc_dapm_put_enum_virt(struct snd_kcontrol *kcontrol,
2800                               struct snd_ctl_elem_value *ucontrol)
2801{
2802        struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2803        struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2804        struct snd_soc_codec *codec = widget->codec;
2805        struct snd_soc_card *card = codec->card;
2806        struct soc_enum *e =
2807                (struct soc_enum *)kcontrol->private_value;
2808        int change;
2809        int ret = 0;
2810        int wi;
2811
2812        if (ucontrol->value.enumerated.item[0] >= e->max)
2813                return -EINVAL;
2814
2815        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2816
2817        change = widget->value != ucontrol->value.enumerated.item[0];
2818        if (change) {
2819                for (wi = 0; wi < wlist->num_widgets; wi++) {
2820                        widget = wlist->widgets[wi];
2821
2822                        widget->value = ucontrol->value.enumerated.item[0];
2823
2824                        soc_dapm_mux_update_power(widget, kcontrol, widget->value, e);
2825                }
2826        }
2827
2828        mutex_unlock(&card->dapm_mutex);
2829        return ret;
2830}
2831EXPORT_SYMBOL_GPL(snd_soc_dapm_put_enum_virt);
2832
2833/**
2834 * snd_soc_dapm_get_value_enum_double - dapm semi enumerated double mixer get
2835 *                                      callback
2836 * @kcontrol: mixer control
2837 * @ucontrol: control element information
2838 *
2839 * Callback to get the value of a dapm semi enumerated double mixer control.
2840 *
2841 * Semi enumerated mixer: the enumerated items are referred as values. Can be
2842 * used for handling bitfield coded enumeration for example.
2843 *
2844 * Returns 0 for success.
2845 */
2846int snd_soc_dapm_get_value_enum_double(struct snd_kcontrol *kcontrol,
2847        struct snd_ctl_elem_value *ucontrol)
2848{
2849        struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2850        struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2851        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2852        unsigned int reg_val, val, mux;
2853
2854        reg_val = snd_soc_read(widget->codec, e->reg);
2855        val = (reg_val >> e->shift_l) & e->mask;
2856        for (mux = 0; mux < e->max; mux++) {
2857                if (val == e->values[mux])
2858                        break;
2859        }
2860        ucontrol->value.enumerated.item[0] = mux;
2861        if (e->shift_l != e->shift_r) {
2862                val = (reg_val >> e->shift_r) & e->mask;
2863                for (mux = 0; mux < e->max; mux++) {
2864                        if (val == e->values[mux])
2865                                break;
2866                }
2867                ucontrol->value.enumerated.item[1] = mux;
2868        }
2869
2870        return 0;
2871}
2872EXPORT_SYMBOL_GPL(snd_soc_dapm_get_value_enum_double);
2873
2874/**
2875 * snd_soc_dapm_put_value_enum_double - dapm semi enumerated double mixer set
2876 *                                      callback
2877 * @kcontrol: mixer control
2878 * @ucontrol: control element information
2879 *
2880 * Callback to set the value of a dapm semi enumerated double mixer control.
2881 *
2882 * Semi enumerated mixer: the enumerated items are referred as values. Can be
2883 * used for handling bitfield coded enumeration for example.
2884 *
2885 * Returns 0 for success.
2886 */
2887int snd_soc_dapm_put_value_enum_double(struct snd_kcontrol *kcontrol,
2888        struct snd_ctl_elem_value *ucontrol)
2889{
2890        struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
2891        struct snd_soc_dapm_widget *widget = wlist->widgets[0];
2892        struct snd_soc_codec *codec = widget->codec;
2893        struct snd_soc_card *card = codec->card;
2894        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
2895        unsigned int val, mux, change;
2896        unsigned int mask;
2897        struct snd_soc_dapm_update update;
2898        int wi;
2899
2900        if (ucontrol->value.enumerated.item[0] > e->max - 1)
2901                return -EINVAL;
2902        mux = ucontrol->value.enumerated.item[0];
2903        val = e->values[ucontrol->value.enumerated.item[0]] << e->shift_l;
2904        mask = e->mask << e->shift_l;
2905        if (e->shift_l != e->shift_r) {
2906                if (ucontrol->value.enumerated.item[1] > e->max - 1)
2907                        return -EINVAL;
2908                val |= e->values[ucontrol->value.enumerated.item[1]] << e->shift_r;
2909                mask |= e->mask << e->shift_r;
2910        }
2911
2912        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2913
2914        change = snd_soc_test_bits(widget->codec, e->reg, mask, val);
2915        if (change) {
2916                for (wi = 0; wi < wlist->num_widgets; wi++) {
2917                        widget = wlist->widgets[wi];
2918
2919                        widget->value = val;
2920
2921                        update.kcontrol = kcontrol;
2922                        update.widget = widget;
2923                        update.reg = e->reg;
2924                        update.mask = mask;
2925                        update.val = val;
2926                        widget->dapm->update = &update;
2927
2928                        soc_dapm_mux_update_power(widget, kcontrol, mux, e);
2929
2930                        widget->dapm->update = NULL;
2931                }
2932        }
2933
2934        mutex_unlock(&card->dapm_mutex);
2935        return change;
2936}
2937EXPORT_SYMBOL_GPL(snd_soc_dapm_put_value_enum_double);
2938
2939/**
2940 * snd_soc_dapm_info_pin_switch - Info for a pin switch
2941 *
2942 * @kcontrol: mixer control
2943 * @uinfo: control element information
2944 *
2945 * Callback to provide information about a pin switch control.
2946 */
2947int snd_soc_dapm_info_pin_switch(struct snd_kcontrol *kcontrol,
2948                                 struct snd_ctl_elem_info *uinfo)
2949{
2950        uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
2951        uinfo->count = 1;
2952        uinfo->value.integer.min = 0;
2953        uinfo->value.integer.max = 1;
2954
2955        return 0;
2956}
2957EXPORT_SYMBOL_GPL(snd_soc_dapm_info_pin_switch);
2958
2959/**
2960 * snd_soc_dapm_get_pin_switch - Get information for a pin switch
2961 *
2962 * @kcontrol: mixer control
2963 * @ucontrol: Value
2964 */
2965int snd_soc_dapm_get_pin_switch(struct snd_kcontrol *kcontrol,
2966                                struct snd_ctl_elem_value *ucontrol)
2967{
2968        struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
2969        const char *pin = (const char *)kcontrol->private_value;
2970
2971        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2972
2973        ucontrol->value.integer.value[0] =
2974                snd_soc_dapm_get_pin_status(&card->dapm, pin);
2975
2976        mutex_unlock(&card->dapm_mutex);
2977
2978        return 0;
2979}
2980EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_switch);
2981
2982/**
2983 * snd_soc_dapm_put_pin_switch - Set information for a pin switch
2984 *
2985 * @kcontrol: mixer control
2986 * @ucontrol: Value
2987 */
2988int snd_soc_dapm_put_pin_switch(struct snd_kcontrol *kcontrol,
2989                                struct snd_ctl_elem_value *ucontrol)
2990{
2991        struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
2992        const char *pin = (const char *)kcontrol->private_value;
2993
2994        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
2995
2996        if (ucontrol->value.integer.value[0])
2997                snd_soc_dapm_enable_pin(&card->dapm, pin);
2998        else
2999                snd_soc_dapm_disable_pin(&card->dapm, pin);
3000
3001        mutex_unlock(&card->dapm_mutex);
3002
3003        snd_soc_dapm_sync(&card->dapm);
3004        return 0;
3005}
3006EXPORT_SYMBOL_GPL(snd_soc_dapm_put_pin_switch);
3007
3008static struct snd_soc_dapm_widget *
3009snd_soc_dapm_new_control(struct snd_soc_dapm_context *dapm,
3010                         const struct snd_soc_dapm_widget *widget)
3011{
3012        struct snd_soc_dapm_widget *w;
3013        size_t name_len;
3014        int ret;
3015
3016        if ((w = dapm_cnew_widget(widget)) == NULL)
3017                return NULL;
3018
3019        switch (w->id) {
3020        case snd_soc_dapm_regulator_supply:
3021                w->regulator = devm_regulator_get(dapm->dev, w->name);
3022                if (IS_ERR(w->regulator)) {
3023                        ret = PTR_ERR(w->regulator);
3024                        dev_err(dapm->dev, "Failed to request %s: %d\n",
3025                                w->name, ret);
3026                        return NULL;
3027                }
3028                break;
3029        case snd_soc_dapm_clock_supply:
3030#ifdef CONFIG_CLKDEV_LOOKUP
3031                w->clk = devm_clk_get(dapm->dev, w->name);
3032                if (IS_ERR(w->clk)) {
3033                        ret = PTR_ERR(w->clk);
3034                        dev_err(dapm->dev, "Failed to request %s: %d\n",
3035                                w->name, ret);
3036                        return NULL;
3037                }
3038#else
3039                return NULL;
3040#endif
3041                break;
3042        default:
3043                break;
3044        }
3045
3046        name_len = strlen(widget->name) + 1;
3047        if (dapm->codec && dapm->codec->name_prefix)
3048                name_len += 1 + strlen(dapm->codec->name_prefix);
3049        w->name = kmalloc(name_len, GFP_KERNEL);
3050        if (w->name == NULL) {
3051                kfree(w);
3052                return NULL;
3053        }
3054        if (dapm->codec && dapm->codec->name_prefix)
3055                snprintf((char *)w->name, name_len, "%s %s",
3056                        dapm->codec->name_prefix, widget->name);
3057        else
3058                snprintf((char *)w->name, name_len, "%s", widget->name);
3059
3060        switch (w->id) {
3061        case snd_soc_dapm_switch:
3062        case snd_soc_dapm_mixer:
3063        case snd_soc_dapm_mixer_named_ctl:
3064                w->power_check = dapm_generic_check_power;
3065                break;
3066        case snd_soc_dapm_mux:
3067        case snd_soc_dapm_virt_mux:
3068        case snd_soc_dapm_value_mux:
3069                w->power_check = dapm_generic_check_power;
3070                break;
3071        case snd_soc_dapm_adc:
3072        case snd_soc_dapm_aif_out:
3073                w->power_check = dapm_adc_check_power;
3074                break;
3075        case snd_soc_dapm_dac:
3076        case snd_soc_dapm_aif_in:
3077                w->power_check = dapm_dac_check_power;
3078                break;
3079        case snd_soc_dapm_pga:
3080        case snd_soc_dapm_out_drv:
3081        case snd_soc_dapm_input:
3082        case snd_soc_dapm_output:
3083        case snd_soc_dapm_micbias:
3084        case snd_soc_dapm_spk:
3085        case snd_soc_dapm_hp:
3086        case snd_soc_dapm_mic:
3087        case snd_soc_dapm_line:
3088        case snd_soc_dapm_dai_link:
3089                w->power_check = dapm_generic_check_power;
3090                break;
3091        case snd_soc_dapm_supply:
3092        case snd_soc_dapm_regulator_supply:
3093        case snd_soc_dapm_clock_supply:
3094                w->power_check = dapm_supply_check_power;
3095                break;
3096        case snd_soc_dapm_dai:
3097                w->power_check = dapm_dai_check_power;
3098                break;
3099        default:
3100                w->power_check = dapm_always_on_check_power;
3101                break;
3102        }
3103
3104        dapm->n_widgets++;
3105        w->dapm = dapm;
3106        w->codec = dapm->codec;
3107        w->platform = dapm->platform;
3108        INIT_LIST_HEAD(&w->sources);
3109        INIT_LIST_HEAD(&w->sinks);
3110        INIT_LIST_HEAD(&w->list);
3111        INIT_LIST_HEAD(&w->dirty);
3112        list_add(&w->list, &dapm->card->widgets);
3113
3114        /* machine layer set ups unconnected pins and insertions */
3115        w->connected = 1;
3116        return w;
3117}
3118
3119/**
3120 * snd_soc_dapm_new_controls - create new dapm controls
3121 * @dapm: DAPM context
3122 * @widget: widget array
3123 * @num: number of widgets
3124 *
3125 * Creates new DAPM controls based upon the templates.
3126 *
3127 * Returns 0 for success else error.
3128 */
3129int snd_soc_dapm_new_controls(struct snd_soc_dapm_context *dapm,
3130        const struct snd_soc_dapm_widget *widget,
3131        int num)
3132{
3133        struct snd_soc_dapm_widget *w;
3134        int i;
3135        int ret = 0;
3136
3137        mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_INIT);
3138        for (i = 0; i < num; i++) {
3139                w = snd_soc_dapm_new_control(dapm, widget);
3140                if (!w) {
3141                        dev_err(dapm->dev,
3142                                "ASoC: Failed to create DAPM control %s\n",
3143                                widget->name);
3144                        ret = -ENOMEM;
3145                        break;
3146                }
3147                widget++;
3148        }
3149        mutex_unlock(&dapm->card->dapm_mutex);
3150        return ret;
3151}
3152EXPORT_SYMBOL_GPL(snd_soc_dapm_new_controls);
3153
3154static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
3155                                  struct snd_kcontrol *kcontrol, int event)
3156{
3157        struct snd_soc_dapm_path *source_p, *sink_p;
3158        struct snd_soc_dai *source, *sink;
3159        const struct snd_soc_pcm_stream *config = w->params;
3160        struct snd_pcm_substream substream;
3161        struct snd_pcm_hw_params *params = NULL;
3162        u64 fmt;
3163        int ret;
3164
3165        BUG_ON(!config);
3166        BUG_ON(list_empty(&w->sources) || list_empty(&w->sinks));
3167
3168        /* We only support a single source and sink, pick the first */
3169        source_p = list_first_entry(&w->sources, struct snd_soc_dapm_path,
3170                                    list_sink);
3171        sink_p = list_first_entry(&w->sinks, struct snd_soc_dapm_path,
3172                                  list_source);
3173
3174        BUG_ON(!source_p || !sink_p);
3175        BUG_ON(!sink_p->source || !source_p->sink);
3176        BUG_ON(!source_p->source || !sink_p->sink);
3177
3178        source = source_p->source->priv;
3179        sink = sink_p->sink->priv;
3180
3181        /* Be a little careful as we don't want to overflow the mask array */
3182        if (config->formats) {
3183                fmt = ffs(config->formats) - 1;
3184        } else {
3185                dev_warn(w->dapm->dev, "Invalid format %llx specified\n",
3186                         config->formats);
3187                fmt = 0;
3188        }
3189
3190        /* Currently very limited parameter selection */
3191        params = kzalloc(sizeof(*params), GFP_KERNEL);
3192        if (!params) {
3193                ret = -ENOMEM;
3194                goto out;
3195        }
3196        snd_mask_set(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), fmt);
3197
3198        hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->min =
3199                config->rate_min;
3200        hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE)->max =
3201                config->rate_max;
3202
3203        hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->min
3204                = config->channels_min;
3205        hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS)->max
3206                = config->channels_max;
3207
3208        memset(&substream, 0, sizeof(substream));
3209
3210        switch (event) {
3211        case SND_SOC_DAPM_PRE_PMU:
3212                if (source->driver->ops && source->driver->ops->hw_params) {
3213                        substream.stream = SNDRV_PCM_STREAM_CAPTURE;
3214                        ret = source->driver->ops->hw_params(&substream,
3215                                                             params, source);
3216                        if (ret != 0) {
3217                                dev_err(source->dev,
3218                                        "hw_params() failed: %d\n", ret);
3219                                goto out;
3220                        }
3221                }
3222
3223                if (sink->driver->ops && sink->driver->ops->hw_params) {
3224                        substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
3225                        ret = sink->driver->ops->hw_params(&substream, params,
3226                                                           sink);
3227                        if (ret != 0) {
3228                                dev_err(sink->dev,
3229                                        "hw_params() failed: %d\n", ret);
3230                                goto out;
3231                        }
3232                }
3233                break;
3234
3235        case SND_SOC_DAPM_POST_PMU:
3236                ret = snd_soc_dai_digital_mute(sink, 0);
3237                if (ret != 0 && ret != -ENOTSUPP)
3238                        dev_warn(sink->dev, "Failed to unmute: %d\n", ret);
3239                ret = 0;
3240                break;
3241
3242        case SND_SOC_DAPM_PRE_PMD:
3243                ret = snd_soc_dai_digital_mute(sink, 1);
3244                if (ret != 0 && ret != -ENOTSUPP)
3245                        dev_warn(sink->dev, "Failed to mute: %d\n", ret);
3246                ret = 0;
3247                break;
3248
3249        default:
3250                BUG();
3251                return -EINVAL;
3252        }
3253
3254out:
3255        kfree(params);
3256        return ret;
3257}
3258
3259int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
3260                         const struct snd_soc_pcm_stream *params,
3261                         struct snd_soc_dapm_widget *source,
3262                         struct snd_soc_dapm_widget *sink)
3263{
3264        struct snd_soc_dapm_route routes[2];
3265        struct snd_soc_dapm_widget template;
3266        struct snd_soc_dapm_widget *w;
3267        size_t len;
3268        char *link_name;
3269
3270        len = strlen(source->name) + strlen(sink->name) + 2;
3271        link_name = devm_kzalloc(card->dev, len, GFP_KERNEL);
3272        if (!link_name)
3273                return -ENOMEM;
3274        snprintf(link_name, len, "%s-%s", source->name, sink->name);
3275
3276        memset(&template, 0, sizeof(template));
3277        template.reg = SND_SOC_NOPM;
3278        template.id = snd_soc_dapm_dai_link;
3279        template.name = link_name;
3280        template.event = snd_soc_dai_link_event;
3281        template.event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
3282                SND_SOC_DAPM_PRE_PMD;
3283
3284        dev_dbg(card->dev, "adding %s widget\n", link_name);
3285
3286        w = snd_soc_dapm_new_control(&card->dapm, &template);
3287        if (!w) {
3288                dev_err(card->dev, "Failed to create %s widget\n",
3289                        link_name);
3290                return -ENOMEM;
3291        }
3292
3293        w->params = params;
3294
3295        memset(&routes, 0, sizeof(routes));
3296
3297        routes[0].source = source->name;
3298        routes[0].sink = link_name;
3299        routes[1].source = link_name;
3300        routes[1].sink = sink->name;
3301
3302        return snd_soc_dapm_add_routes(&card->dapm, routes,
3303                                       ARRAY_SIZE(routes));
3304}
3305
3306int snd_soc_dapm_new_dai_widgets(struct snd_soc_dapm_context *dapm,
3307                                 struct snd_soc_dai *dai)
3308{
3309        struct snd_soc_dapm_widget template;
3310        struct snd_soc_dapm_widget *w;
3311
3312        WARN_ON(dapm->dev != dai->dev);
3313
3314        memset(&template, 0, sizeof(template));
3315        template.reg = SND_SOC_NOPM;
3316
3317        if (dai->driver->playback.stream_name) {
3318                template.id = snd_soc_dapm_dai;
3319                template.name = dai->driver->playback.stream_name;
3320                template.sname = dai->driver->playback.stream_name;
3321
3322                dev_dbg(dai->dev, "adding %s widget\n",
3323                        template.name);
3324
3325                w = snd_soc_dapm_new_control(dapm, &template);
3326                if (!w) {
3327                        dev_err(dapm->dev, "Failed to create %s widget\n",
3328                                dai->driver->playback.stream_name);
3329                }
3330
3331                w->priv = dai;
3332                dai->playback_widget = w;
3333        }
3334
3335        if (dai->driver->capture.stream_name) {
3336                template.id = snd_soc_dapm_dai;
3337                template.name = dai->driver->capture.stream_name;
3338                template.sname = dai->driver->capture.stream_name;
3339
3340                dev_dbg(dai->dev, "adding %s widget\n",
3341                        template.name);
3342
3343                w = snd_soc_dapm_new_control(dapm, &template);
3344                if (!w) {
3345                        dev_err(dapm->dev, "Failed to create %s widget\n",
3346                                dai->driver->capture.stream_name);
3347                }
3348
3349                w->priv = dai;
3350                dai->capture_widget = w;
3351        }
3352
3353        return 0;
3354}
3355
3356int snd_soc_dapm_link_dai_widgets(struct snd_soc_card *card)
3357{
3358        struct snd_soc_dapm_widget *dai_w, *w;
3359        struct snd_soc_dai *dai;
3360        struct snd_soc_dapm_route r;
3361
3362        memset(&r, 0, sizeof(r));
3363
3364        /* For each DAI widget... */
3365        list_for_each_entry(dai_w, &card->widgets, list) {
3366                if (dai_w->id != snd_soc_dapm_dai)
3367                        continue;
3368
3369                dai = dai_w->priv;
3370
3371                /* ...find all widgets with the same stream and link them */
3372                list_for_each_entry(w, &card->widgets, list) {
3373                        if (w->dapm != dai_w->dapm)
3374                                continue;
3375
3376                        if (w->id == snd_soc_dapm_dai)
3377                                continue;
3378
3379                        if (!w->sname)
3380                                continue;
3381
3382                        if (dai->driver->playback.stream_name &&
3383                            strstr(w->sname,
3384                                   dai->driver->playback.stream_name)) {
3385                                r.source = dai->playback_widget->name;
3386                                r.sink = w->name;
3387                                dev_dbg(dai->dev, "%s -> %s\n",
3388                                         r.source, r.sink);
3389
3390                                snd_soc_dapm_add_route(w->dapm, &r);
3391                        }
3392
3393                        if (dai->driver->capture.stream_name &&
3394                            strstr(w->sname,
3395                                   dai->driver->capture.stream_name)) {
3396                                r.source = w->name;
3397                                r.sink = dai->capture_widget->name;
3398                                dev_dbg(dai->dev, "%s -> %s\n",
3399                                        r.source, r.sink);
3400
3401                                snd_soc_dapm_add_route(w->dapm, &r);
3402                        }
3403                }
3404        }
3405
3406        return 0;
3407}
3408
3409static void soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
3410        int event)
3411{
3412
3413        struct snd_soc_dapm_widget *w_cpu, *w_codec;
3414        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
3415        struct snd_soc_dai *codec_dai = rtd->codec_dai;
3416
3417        if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
3418                w_cpu = cpu_dai->playback_widget;
3419                w_codec = codec_dai->playback_widget;
3420        } else {
3421                w_cpu = cpu_dai->capture_widget;
3422                w_codec = codec_dai->capture_widget;
3423        }
3424
3425        if (w_cpu) {
3426
3427                dapm_mark_dirty(w_cpu, "stream event");
3428
3429                switch (event) {
3430                case SND_SOC_DAPM_STREAM_START:
3431                        w_cpu->active = 1;
3432                        break;
3433                case SND_SOC_DAPM_STREAM_STOP:
3434                        w_cpu->active = 0;
3435                        break;
3436                case SND_SOC_DAPM_STREAM_SUSPEND:
3437                case SND_SOC_DAPM_STREAM_RESUME:
3438                case SND_SOC_DAPM_STREAM_PAUSE_PUSH:
3439                case SND_SOC_DAPM_STREAM_PAUSE_RELEASE:
3440                        break;
3441                }
3442        }
3443
3444        if (w_codec) {
3445
3446                dapm_mark_dirty(w_codec, "stream event");
3447
3448                switch (event) {
3449                case SND_SOC_DAPM_STREAM_START:
3450                        w_codec->active = 1;
3451                        break;
3452                case SND_SOC_DAPM_STREAM_STOP:
3453                        w_codec->active = 0;
3454                        break;
3455                case SND_SOC_DAPM_STREAM_SUSPEND:
3456                case SND_SOC_DAPM_STREAM_RESUME:
3457                case SND_SOC_DAPM_STREAM_PAUSE_PUSH:
3458                case SND_SOC_DAPM_STREAM_PAUSE_RELEASE:
3459                        break;
3460                }
3461        }
3462
3463        dapm_power_widgets(&rtd->card->dapm, event);
3464}
3465
3466/**
3467 * snd_soc_dapm_stream_event - send a stream event to the dapm core
3468 * @rtd: PCM runtime data
3469 * @stream: stream name
3470 * @event: stream event
3471 *
3472 * Sends a stream event to the dapm core. The core then makes any
3473 * necessary widget power changes.
3474 *
3475 * Returns 0 for success else error.
3476 */
3477void snd_soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
3478                              int event)
3479{
3480        struct snd_soc_card *card = rtd->card;
3481
3482        mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
3483        soc_dapm_stream_event(rtd, stream, event);
3484        mutex_unlock(&card->dapm_mutex);
3485}
3486
3487/**
3488 * snd_soc_dapm_enable_pin - enable pin.
3489 * @dapm: DAPM context
3490 * @pin: pin name
3491 *
3492 * Enables input/output pin and its parents or children widgets iff there is
3493 * a valid audio route and active audio stream.
3494 * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3495 * do any widget power switching.
3496 */
3497int snd_soc_dapm_enable_pin(struct snd_soc_dapm_context *dapm, const char *pin)
3498{
3499        return snd_soc_dapm_set_pin(dapm, pin, 1);
3500}
3501EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin);
3502
3503/**
3504 * snd_soc_dapm_force_enable_pin - force a pin to be enabled
3505 * @dapm: DAPM context
3506 * @pin: pin name
3507 *
3508 * Enables input/output pin regardless of any other state.  This is
3509 * intended for use with microphone bias supplies used in microphone
3510 * jack detection.
3511 *
3512 * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3513 * do any widget power switching.
3514 */
3515int snd_soc_dapm_force_enable_pin(struct snd_soc_dapm_context *dapm,
3516                                  const char *pin)
3517{
3518        struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
3519
3520        if (!w) {
3521                dev_err(dapm->dev, "dapm: unknown pin %s\n", pin);
3522                return -EINVAL;
3523        }
3524
3525        dev_dbg(w->dapm->dev, "dapm: force enable pin %s\n", pin);
3526        w->connected = 1;
3527        w->force = 1;
3528        dapm_mark_dirty(w, "force enable");
3529
3530        return 0;
3531}
3532EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin);
3533
3534/**
3535 * snd_soc_dapm_disable_pin - disable pin.
3536 * @dapm: DAPM context
3537 * @pin: pin name
3538 *
3539 * Disables input/output pin and its parents or children widgets.
3540 * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3541 * do any widget power switching.
3542 */
3543int snd_soc_dapm_disable_pin(struct snd_soc_dapm_context *dapm,
3544                             const char *pin)
3545{
3546        return snd_soc_dapm_set_pin(dapm, pin, 0);
3547}
3548EXPORT_SYMBOL_GPL(snd_soc_dapm_disable_pin);
3549
3550/**
3551 * snd_soc_dapm_nc_pin - permanently disable pin.
3552 * @dapm: DAPM context
3553 * @pin: pin name
3554 *
3555 * Marks the specified pin as being not connected, disabling it along
3556 * any parent or child widgets.  At present this is identical to
3557 * snd_soc_dapm_disable_pin() but in future it will be extended to do
3558 * additional things such as disabling controls which only affect
3559 * paths through the pin.
3560 *
3561 * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to
3562 * do any widget power switching.
3563 */
3564int snd_soc_dapm_nc_pin(struct snd_soc_dapm_context *dapm, const char *pin)
3565{
3566        return snd_soc_dapm_set_pin(dapm, pin, 0);
3567}
3568EXPORT_SYMBOL_GPL(snd_soc_dapm_nc_pin);
3569
3570/**
3571 * snd_soc_dapm_get_pin_status - get audio pin status
3572 * @dapm: DAPM context
3573 * @pin: audio signal pin endpoint (or start point)
3574 *
3575 * Get audio pin status - connected or disconnected.
3576 *
3577 * Returns 1 for connected otherwise 0.
3578 */
3579int snd_soc_dapm_get_pin_status(struct snd_soc_dapm_context *dapm,
3580                                const char *pin)
3581{
3582        struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, true);
3583
3584        if (w)
3585                return w->connected;
3586
3587        return 0;
3588}
3589EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_status);
3590
3591/**
3592 * snd_soc_dapm_ignore_suspend - ignore suspend status for DAPM endpoint
3593 * @dapm: DAPM context
3594 * @pin: audio signal pin endpoint (or start point)
3595 *
3596 * Mark the given endpoint or pin as ignoring suspend.  When the
3597 * system is disabled a path between two endpoints flagged as ignoring
3598 * suspend will not be disabled.  The path must already be enabled via
3599 * normal means at suspend time, it will not be turned on if it was not
3600 * already enabled.
3601 */
3602int snd_soc_dapm_ignore_suspend(struct snd_soc_dapm_context *dapm,
3603                                const char *pin)
3604{
3605        struct snd_soc_dapm_widget *w = dapm_find_widget(dapm, pin, false);
3606
3607        if (!w) {
3608                dev_err(dapm->dev, "dapm: unknown pin %s\n", pin);
3609                return -EINVAL;
3610        }
3611
3612        w->ignore_suspend = 1;
3613
3614        return 0;
3615}
3616EXPORT_SYMBOL_GPL(snd_soc_dapm_ignore_suspend);
3617
3618static bool snd_soc_dapm_widget_in_card_paths(struct snd_soc_card *card,
3619                                              struct snd_soc_dapm_widget *w)
3620{
3621        struct snd_soc_dapm_path *p;
3622
3623        list_for_each_entry(p, &card->paths, list) {
3624                if ((p->source == w) || (p->sink == w)) {
3625                        dev_dbg(card->dev,
3626                            "... Path %s(id:%d dapm:%p) - %s(id:%d dapm:%p)\n",
3627                            p->source->name, p->source->id, p->source->dapm,
3628                            p->sink->name, p->sink->id, p->sink->dapm);
3629
3630                        /* Connected to something other than the codec */
3631                        if (p->source->dapm != p->sink->dapm)
3632                                return true;
3633                        /*
3634                         * Loopback connection from codec external pin to
3635                         * codec external pin
3636                         */
3637                        if (p->sink->id == snd_soc_dapm_input) {
3638                                switch (p->source->id) {
3639                                case snd_soc_dapm_output:
3640                                case snd_soc_dapm_micbias:
3641                                        return true;
3642                                default:
3643                                        break;
3644                                }
3645                        }
3646                }
3647        }
3648
3649        return false;
3650}
3651
3652/**
3653 * snd_soc_dapm_auto_nc_codec_pins - call snd_soc_dapm_nc_pin for unused pins
3654 * @codec: The codec whose pins should be processed
3655 *
3656 * Automatically call snd_soc_dapm_nc_pin() for any external pins in the codec
3657 * which are unused. Pins are used if they are connected externally to the
3658 * codec, whether that be to some other device, or a loop-back connection to
3659 * the codec itself.
3660 */
3661void snd_soc_dapm_auto_nc_codec_pins(struct snd_soc_codec *codec)
3662{
3663        struct snd_soc_card *card = codec->card;
3664        struct snd_soc_dapm_context *dapm = &codec->dapm;
3665        struct snd_soc_dapm_widget *w;
3666
3667        dev_dbg(codec->dev, "Auto NC: DAPMs: card:%p codec:%p\n",
3668                &card->dapm, &codec->dapm);
3669
3670        list_for_each_entry(w, &card->widgets, list) {
3671                if (w->dapm != dapm)
3672                        continue;
3673                switch (w->id) {
3674                case snd_soc_dapm_input:
3675                case snd_soc_dapm_output:
3676                case snd_soc_dapm_micbias:
3677                        dev_dbg(codec->dev, "Auto NC: Checking widget %s\n",
3678                                w->name);
3679                        if (!snd_soc_dapm_widget_in_card_paths(card, w)) {
3680                                dev_dbg(codec->dev,
3681                                        "... Not in map; disabling\n");
3682                                snd_soc_dapm_nc_pin(dapm, w->name);
3683                        }
3684                        break;
3685                default:
3686                        break;
3687                }
3688        }
3689}
3690
3691/**
3692 * snd_soc_dapm_free - free dapm resources
3693 * @dapm: DAPM context
3694 *
3695 * Free all dapm widgets and resources.
3696 */
3697void snd_soc_dapm_free(struct snd_soc_dapm_context *dapm)
3698{
3699        snd_soc_dapm_sys_remove(dapm->dev);
3700        dapm_debugfs_cleanup(dapm);
3701        dapm_free_widgets(dapm);
3702        list_del(&dapm->list);
3703}
3704EXPORT_SYMBOL_GPL(snd_soc_dapm_free);
3705
3706static void soc_dapm_shutdown_codec(struct snd_soc_dapm_context *dapm)
3707{
3708        struct snd_soc_card *card = dapm->card;
3709        struct snd_soc_dapm_widget *w;
3710        LIST_HEAD(down_list);
3711        int powerdown = 0;
3712
3713        mutex_lock(&card->dapm_mutex);
3714
3715        list_for_each_entry(w, &dapm->card->widgets, list) {
3716                if (w->dapm != dapm)
3717                        continue;
3718                if (w->power) {
3719                        dapm_seq_insert(w, &down_list, false);
3720                        w->power = 0;
3721                        powerdown = 1;
3722                }
3723        }
3724
3725        /* If there were no widgets to power down we're already in
3726         * standby.
3727         */
3728        if (powerdown) {
3729                if (dapm->bias_level == SND_SOC_BIAS_ON)
3730                        snd_soc_dapm_set_bias_level(dapm,
3731                                                    SND_SOC_BIAS_PREPARE);
3732                dapm_seq_run(dapm, &down_list, 0, false);
3733                if (dapm->bias_level == SND_SOC_BIAS_PREPARE)
3734                        snd_soc_dapm_set_bias_level(dapm,
3735                                                    SND_SOC_BIAS_STANDBY);
3736        }
3737
3738        mutex_unlock(&card->dapm_mutex);
3739}
3740
3741/*
3742 * snd_soc_dapm_shutdown - callback for system shutdown
3743 */
3744void snd_soc_dapm_shutdown(struct snd_soc_card *card)
3745{
3746        struct snd_soc_codec *codec;
3747
3748        list_for_each_entry(codec, &card->codec_dev_list, card_list) {
3749                soc_dapm_shutdown_codec(&codec->dapm);
3750                if (codec->dapm.bias_level == SND_SOC_BIAS_STANDBY)
3751                        snd_soc_dapm_set_bias_level(&codec->dapm,
3752                                                    SND_SOC_BIAS_OFF);
3753        }
3754}
3755
3756/* Module information */
3757MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
3758MODULE_DESCRIPTION("Dynamic Audio Power Management core for ALSA SoC");
3759MODULE_LICENSE("GPL");
3760
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