linux/drivers/pinctrl/pinconf.c
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   1/*
   2 * Core driver for the pin config portions of the pin control subsystem
   3 *
   4 * Copyright (C) 2011 ST-Ericsson SA
   5 * Written on behalf of Linaro for ST-Ericsson
   6 *
   7 * Author: Linus Walleij <linus.walleij@linaro.org>
   8 *
   9 * License terms: GNU General Public License (GPL) version 2
  10 */
  11#define pr_fmt(fmt) "pinconfig core: " fmt
  12
  13#include <linux/kernel.h>
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/device.h>
  17#include <linux/slab.h>
  18#include <linux/debugfs.h>
  19#include <linux/seq_file.h>
  20#include <linux/uaccess.h>
  21#include <linux/pinctrl/machine.h>
  22#include <linux/pinctrl/pinctrl.h>
  23#include <linux/pinctrl/pinconf.h>
  24#include "core.h"
  25#include "pinconf.h"
  26
  27int pinconf_check_ops(struct pinctrl_dev *pctldev)
  28{
  29        const struct pinconf_ops *ops = pctldev->desc->confops;
  30
  31        /* We must be able to read out pin status */
  32        if (!ops->pin_config_get && !ops->pin_config_group_get) {
  33                dev_err(pctldev->dev,
  34                        "pinconf must be able to read out pin status\n");
  35                return -EINVAL;
  36        }
  37        /* We have to be able to config the pins in SOME way */
  38        if (!ops->pin_config_set && !ops->pin_config_group_set) {
  39                dev_err(pctldev->dev,
  40                        "pinconf has to be able to set a pins config\n");
  41                return -EINVAL;
  42        }
  43        return 0;
  44}
  45
  46int pinconf_validate_map(struct pinctrl_map const *map, int i)
  47{
  48        if (!map->data.configs.group_or_pin) {
  49                pr_err("failed to register map %s (%d): no group/pin given\n",
  50                       map->name, i);
  51                return -EINVAL;
  52        }
  53
  54        if (!map->data.configs.num_configs ||
  55                        !map->data.configs.configs) {
  56                pr_err("failed to register map %s (%d): no configs given\n",
  57                       map->name, i);
  58                return -EINVAL;
  59        }
  60
  61        return 0;
  62}
  63
  64int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
  65                           unsigned long *config)
  66{
  67        const struct pinconf_ops *ops = pctldev->desc->confops;
  68
  69        if (!ops || !ops->pin_config_get) {
  70                dev_err(pctldev->dev, "cannot get pin configuration, missing "
  71                        "pin_config_get() function in driver\n");
  72                return -EINVAL;
  73        }
  74
  75        return ops->pin_config_get(pctldev, pin, config);
  76}
  77
  78/**
  79 * pin_config_get() - get the configuration of a single pin parameter
  80 * @dev_name: name of the pin controller device for this pin
  81 * @name: name of the pin to get the config for
  82 * @config: the config pointed to by this argument will be filled in with the
  83 *      current pin state, it can be used directly by drivers as a numeral, or
  84 *      it can be dereferenced to any struct.
  85 */
  86int pin_config_get(const char *dev_name, const char *name,
  87                          unsigned long *config)
  88{
  89        struct pinctrl_dev *pctldev;
  90        int pin;
  91
  92        pctldev = get_pinctrl_dev_from_devname(dev_name);
  93        if (!pctldev) {
  94                pin = -EINVAL;
  95                return pin;
  96        }
  97
  98        mutex_lock(&pctldev->mutex);
  99
 100        pin = pin_get_from_name(pctldev, name);
 101        if (pin < 0)
 102                goto unlock;
 103
 104        pin = pin_config_get_for_pin(pctldev, pin, config);
 105
 106unlock:
 107        mutex_unlock(&pctldev->mutex);
 108        return pin;
 109}
 110EXPORT_SYMBOL(pin_config_get);
 111
 112static int pin_config_set_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
 113                           unsigned long config)
 114{
 115        const struct pinconf_ops *ops = pctldev->desc->confops;
 116        int ret;
 117
 118        if (!ops || !ops->pin_config_set) {
 119                dev_err(pctldev->dev, "cannot configure pin, missing "
 120                        "config function in driver\n");
 121                return -EINVAL;
 122        }
 123
 124        ret = ops->pin_config_set(pctldev, pin, config);
 125        if (ret) {
 126                dev_err(pctldev->dev,
 127                        "unable to set pin configuration on pin %d\n", pin);
 128                return ret;
 129        }
 130
 131        return 0;
 132}
 133
 134/**
 135 * pin_config_set() - set the configuration of a single pin parameter
 136 * @dev_name: name of pin controller device for this pin
 137 * @name: name of the pin to set the config for
 138 * @config: the config in this argument will contain the desired pin state, it
 139 *      can be used directly by drivers as a numeral, or it can be dereferenced
 140 *      to any struct.
 141 */
 142int pin_config_set(const char *dev_name, const char *name,
 143                   unsigned long config)
 144{
 145        struct pinctrl_dev *pctldev;
 146        int pin, ret;
 147
 148        pctldev = get_pinctrl_dev_from_devname(dev_name);
 149        if (!pctldev) {
 150                ret = -EINVAL;
 151                return ret;
 152        }
 153
 154        mutex_lock(&pctldev->mutex);
 155
 156        pin = pin_get_from_name(pctldev, name);
 157        if (pin < 0) {
 158                ret = pin;
 159                goto unlock;
 160        }
 161
 162        ret = pin_config_set_for_pin(pctldev, pin, config);
 163
 164unlock:
 165        mutex_unlock(&pctldev->mutex);
 166        return ret;
 167}
 168EXPORT_SYMBOL(pin_config_set);
 169
 170int pin_config_group_get(const char *dev_name, const char *pin_group,
 171                         unsigned long *config)
 172{
 173        struct pinctrl_dev *pctldev;
 174        const struct pinconf_ops *ops;
 175        int selector, ret;
 176
 177        pctldev = get_pinctrl_dev_from_devname(dev_name);
 178        if (!pctldev) {
 179                ret = -EINVAL;
 180                return ret;
 181        }
 182
 183        mutex_lock(&pctldev->mutex);
 184
 185        ops = pctldev->desc->confops;
 186
 187        if (!ops || !ops->pin_config_group_get) {
 188                dev_err(pctldev->dev, "cannot get configuration for pin "
 189                        "group, missing group config get function in "
 190                        "driver\n");
 191                ret = -EINVAL;
 192                goto unlock;
 193        }
 194
 195        selector = pinctrl_get_group_selector(pctldev, pin_group);
 196        if (selector < 0) {
 197                ret = selector;
 198                goto unlock;
 199        }
 200
 201        ret = ops->pin_config_group_get(pctldev, selector, config);
 202
 203unlock:
 204        mutex_unlock(&pctldev->mutex);
 205        return ret;
 206}
 207EXPORT_SYMBOL(pin_config_group_get);
 208
 209int pin_config_group_set(const char *dev_name, const char *pin_group,
 210                         unsigned long config)
 211{
 212        struct pinctrl_dev *pctldev;
 213        const struct pinconf_ops *ops;
 214        const struct pinctrl_ops *pctlops;
 215        int selector;
 216        const unsigned *pins;
 217        unsigned num_pins;
 218        int ret;
 219        int i;
 220
 221        pctldev = get_pinctrl_dev_from_devname(dev_name);
 222        if (!pctldev) {
 223                ret = -EINVAL;
 224                return ret;
 225        }
 226
 227        mutex_lock(&pctldev->mutex);
 228
 229        ops = pctldev->desc->confops;
 230        pctlops = pctldev->desc->pctlops;
 231
 232        if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) {
 233                dev_err(pctldev->dev, "cannot configure pin group, missing "
 234                        "config function in driver\n");
 235                ret = -EINVAL;
 236                goto unlock;
 237        }
 238
 239        selector = pinctrl_get_group_selector(pctldev, pin_group);
 240        if (selector < 0) {
 241                ret = selector;
 242                goto unlock;
 243        }
 244
 245        ret = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins);
 246        if (ret) {
 247                dev_err(pctldev->dev, "cannot configure pin group, error "
 248                        "getting pins\n");
 249                goto unlock;
 250        }
 251
 252        /*
 253         * If the pin controller supports handling entire groups we use that
 254         * capability.
 255         */
 256        if (ops->pin_config_group_set) {
 257                ret = ops->pin_config_group_set(pctldev, selector, config);
 258                /*
 259                 * If the pin controller prefer that a certain group be handled
 260                 * pin-by-pin as well, it returns -EAGAIN.
 261                 */
 262                if (ret != -EAGAIN)
 263                        goto unlock;
 264        }
 265
 266        /*
 267         * If the controller cannot handle entire groups, we configure each pin
 268         * individually.
 269         */
 270        if (!ops->pin_config_set) {
 271                ret = 0;
 272                goto unlock;
 273        }
 274
 275        for (i = 0; i < num_pins; i++) {
 276                ret = ops->pin_config_set(pctldev, pins[i], config);
 277                if (ret < 0)
 278                        goto unlock;
 279        }
 280
 281        ret = 0;
 282
 283unlock:
 284        mutex_unlock(&pctldev->mutex);
 285
 286        return ret;
 287}
 288EXPORT_SYMBOL(pin_config_group_set);
 289
 290int pinconf_map_to_setting(struct pinctrl_map const *map,
 291                          struct pinctrl_setting *setting)
 292{
 293        struct pinctrl_dev *pctldev = setting->pctldev;
 294        int pin;
 295
 296        switch (setting->type) {
 297        case PIN_MAP_TYPE_CONFIGS_PIN:
 298                pin = pin_get_from_name(pctldev,
 299                                        map->data.configs.group_or_pin);
 300                if (pin < 0) {
 301                        dev_err(pctldev->dev, "could not map pin config for \"%s\"",
 302                                map->data.configs.group_or_pin);
 303                        return pin;
 304                }
 305                setting->data.configs.group_or_pin = pin;
 306                break;
 307        case PIN_MAP_TYPE_CONFIGS_GROUP:
 308                pin = pinctrl_get_group_selector(pctldev,
 309                                         map->data.configs.group_or_pin);
 310                if (pin < 0) {
 311                        dev_err(pctldev->dev, "could not map group config for \"%s\"",
 312                                map->data.configs.group_or_pin);
 313                        return pin;
 314                }
 315                setting->data.configs.group_or_pin = pin;
 316                break;
 317        default:
 318                return -EINVAL;
 319        }
 320
 321        setting->data.configs.num_configs = map->data.configs.num_configs;
 322        setting->data.configs.configs = map->data.configs.configs;
 323
 324        return 0;
 325}
 326
 327void pinconf_free_setting(struct pinctrl_setting const *setting)
 328{
 329}
 330
 331int pinconf_apply_setting(struct pinctrl_setting const *setting)
 332{
 333        struct pinctrl_dev *pctldev = setting->pctldev;
 334        const struct pinconf_ops *ops = pctldev->desc->confops;
 335        int i, ret;
 336
 337        if (!ops) {
 338                dev_err(pctldev->dev, "missing confops\n");
 339                return -EINVAL;
 340        }
 341
 342        switch (setting->type) {
 343        case PIN_MAP_TYPE_CONFIGS_PIN:
 344                if (!ops->pin_config_set) {
 345                        dev_err(pctldev->dev, "missing pin_config_set op\n");
 346                        return -EINVAL;
 347                }
 348                for (i = 0; i < setting->data.configs.num_configs; i++) {
 349                        ret = ops->pin_config_set(pctldev,
 350                                        setting->data.configs.group_or_pin,
 351                                        setting->data.configs.configs[i]);
 352                        if (ret < 0) {
 353                                dev_err(pctldev->dev,
 354                                        "pin_config_set op failed for pin %d config %08lx\n",
 355                                        setting->data.configs.group_or_pin,
 356                                        setting->data.configs.configs[i]);
 357                                return ret;
 358                        }
 359                }
 360                break;
 361        case PIN_MAP_TYPE_CONFIGS_GROUP:
 362                if (!ops->pin_config_group_set) {
 363                        dev_err(pctldev->dev,
 364                                "missing pin_config_group_set op\n");
 365                        return -EINVAL;
 366                }
 367                for (i = 0; i < setting->data.configs.num_configs; i++) {
 368                        ret = ops->pin_config_group_set(pctldev,
 369                                        setting->data.configs.group_or_pin,
 370                                        setting->data.configs.configs[i]);
 371                        if (ret < 0) {
 372                                dev_err(pctldev->dev,
 373                                        "pin_config_group_set op failed for group %d config %08lx\n",
 374                                        setting->data.configs.group_or_pin,
 375                                        setting->data.configs.configs[i]);
 376                                return ret;
 377                        }
 378                }
 379                break;
 380        default:
 381                return -EINVAL;
 382        }
 383
 384        return 0;
 385}
 386
 387#ifdef CONFIG_DEBUG_FS
 388
 389void pinconf_show_map(struct seq_file *s, struct pinctrl_map const *map)
 390{
 391        struct pinctrl_dev *pctldev;
 392        const struct pinconf_ops *confops;
 393        int i;
 394
 395        pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
 396        if (pctldev)
 397                confops = pctldev->desc->confops;
 398        else
 399                confops = NULL;
 400
 401        switch (map->type) {
 402        case PIN_MAP_TYPE_CONFIGS_PIN:
 403                seq_printf(s, "pin ");
 404                break;
 405        case PIN_MAP_TYPE_CONFIGS_GROUP:
 406                seq_printf(s, "group ");
 407                break;
 408        default:
 409                break;
 410        }
 411
 412        seq_printf(s, "%s\n", map->data.configs.group_or_pin);
 413
 414        for (i = 0; i < map->data.configs.num_configs; i++) {
 415                seq_printf(s, "config ");
 416                if (confops && confops->pin_config_config_dbg_show)
 417                        confops->pin_config_config_dbg_show(pctldev, s,
 418                                                map->data.configs.configs[i]);
 419                else
 420                        seq_printf(s, "%08lx", map->data.configs.configs[i]);
 421                seq_printf(s, "\n");
 422        }
 423}
 424
 425void pinconf_show_setting(struct seq_file *s,
 426                          struct pinctrl_setting const *setting)
 427{
 428        struct pinctrl_dev *pctldev = setting->pctldev;
 429        const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 430        const struct pinconf_ops *confops = pctldev->desc->confops;
 431        struct pin_desc *desc;
 432        int i;
 433
 434        switch (setting->type) {
 435        case PIN_MAP_TYPE_CONFIGS_PIN:
 436                desc = pin_desc_get(setting->pctldev,
 437                                    setting->data.configs.group_or_pin);
 438                seq_printf(s, "pin %s (%d)",
 439                           desc->name ? desc->name : "unnamed",
 440                           setting->data.configs.group_or_pin);
 441                break;
 442        case PIN_MAP_TYPE_CONFIGS_GROUP:
 443                seq_printf(s, "group %s (%d)",
 444                           pctlops->get_group_name(pctldev,
 445                                        setting->data.configs.group_or_pin),
 446                           setting->data.configs.group_or_pin);
 447                break;
 448        default:
 449                break;
 450        }
 451
 452        /*
 453         * FIXME: We should really get the pin controler to dump the config
 454         * values, so they can be decoded to something meaningful.
 455         */
 456        for (i = 0; i < setting->data.configs.num_configs; i++) {
 457                seq_printf(s, " ");
 458                if (confops && confops->pin_config_config_dbg_show)
 459                        confops->pin_config_config_dbg_show(pctldev, s,
 460                                setting->data.configs.configs[i]);
 461                else
 462                        seq_printf(s, "%08lx",
 463                                   setting->data.configs.configs[i]);
 464        }
 465
 466        seq_printf(s, "\n");
 467}
 468
 469static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
 470                             struct seq_file *s, int pin)
 471{
 472        const struct pinconf_ops *ops = pctldev->desc->confops;
 473
 474        /* no-op when not using generic pin config */
 475        pinconf_generic_dump_pin(pctldev, s, pin);
 476        if (ops && ops->pin_config_dbg_show)
 477                ops->pin_config_dbg_show(pctldev, s, pin);
 478}
 479
 480static int pinconf_pins_show(struct seq_file *s, void *what)
 481{
 482        struct pinctrl_dev *pctldev = s->private;
 483        const struct pinconf_ops *ops = pctldev->desc->confops;
 484        unsigned i, pin;
 485
 486        if (!ops || !ops->pin_config_get)
 487                return 0;
 488
 489        seq_puts(s, "Pin config settings per pin\n");
 490        seq_puts(s, "Format: pin (name): configs\n");
 491
 492        mutex_lock(&pctldev->mutex);
 493
 494        /* The pin number can be retrived from the pin controller descriptor */
 495        for (i = 0; i < pctldev->desc->npins; i++) {
 496                struct pin_desc *desc;
 497
 498                pin = pctldev->desc->pins[i].number;
 499                desc = pin_desc_get(pctldev, pin);
 500                /* Skip if we cannot search the pin */
 501                if (desc == NULL)
 502                        continue;
 503
 504                seq_printf(s, "pin %d (%s):", pin,
 505                           desc->name ? desc->name : "unnamed");
 506
 507                pinconf_dump_pin(pctldev, s, pin);
 508
 509                seq_printf(s, "\n");
 510        }
 511
 512        mutex_unlock(&pctldev->mutex);
 513
 514        return 0;
 515}
 516
 517static void pinconf_dump_group(struct pinctrl_dev *pctldev,
 518                               struct seq_file *s, unsigned selector,
 519                               const char *gname)
 520{
 521        const struct pinconf_ops *ops = pctldev->desc->confops;
 522
 523        /* no-op when not using generic pin config */
 524        pinconf_generic_dump_group(pctldev, s, gname);
 525        if (ops && ops->pin_config_group_dbg_show)
 526                ops->pin_config_group_dbg_show(pctldev, s, selector);
 527}
 528
 529static int pinconf_groups_show(struct seq_file *s, void *what)
 530{
 531        struct pinctrl_dev *pctldev = s->private;
 532        const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 533        const struct pinconf_ops *ops = pctldev->desc->confops;
 534        unsigned ngroups = pctlops->get_groups_count(pctldev);
 535        unsigned selector = 0;
 536
 537        if (!ops || !ops->pin_config_group_get)
 538                return 0;
 539
 540        seq_puts(s, "Pin config settings per pin group\n");
 541        seq_puts(s, "Format: group (name): configs\n");
 542
 543        while (selector < ngroups) {
 544                const char *gname = pctlops->get_group_name(pctldev, selector);
 545
 546                seq_printf(s, "%u (%s):", selector, gname);
 547                pinconf_dump_group(pctldev, s, selector, gname);
 548                seq_printf(s, "\n");
 549
 550                selector++;
 551        }
 552
 553        return 0;
 554}
 555
 556static int pinconf_pins_open(struct inode *inode, struct file *file)
 557{
 558        return single_open(file, pinconf_pins_show, inode->i_private);
 559}
 560
 561static int pinconf_groups_open(struct inode *inode, struct file *file)
 562{
 563        return single_open(file, pinconf_groups_show, inode->i_private);
 564}
 565
 566static const struct file_operations pinconf_pins_ops = {
 567        .open           = pinconf_pins_open,
 568        .read           = seq_read,
 569        .llseek         = seq_lseek,
 570        .release        = single_release,
 571};
 572
 573static const struct file_operations pinconf_groups_ops = {
 574        .open           = pinconf_groups_open,
 575        .read           = seq_read,
 576        .llseek         = seq_lseek,
 577        .release        = single_release,
 578};
 579
 580#define MAX_NAME_LEN 15
 581
 582struct dbg_cfg {
 583        enum pinctrl_map_type map_type;
 584        char dev_name[MAX_NAME_LEN+1];
 585        char state_name[MAX_NAME_LEN+1];
 586        char pin_name[MAX_NAME_LEN+1];
 587};
 588
 589/*
 590 * Goal is to keep this structure as global in order to simply read the
 591 * pinconf-config file after a write to check config is as expected
 592 */
 593static struct dbg_cfg pinconf_dbg_conf;
 594
 595/**
 596 * pinconf_dbg_config_print() - display the pinctrl config from the pinctrl
 597 * map, of the dev/pin/state that was last written to pinconf-config file.
 598 * @s: string filled in  with config description
 599 * @d: not used
 600 */
 601static int pinconf_dbg_config_print(struct seq_file *s, void *d)
 602{
 603        struct pinctrl_maps *maps_node;
 604        const struct pinctrl_map *map;
 605        struct pinctrl_dev *pctldev = NULL;
 606        const struct pinconf_ops *confops = NULL;
 607        const struct pinctrl_map_configs *configs;
 608        struct dbg_cfg *dbg = &pinconf_dbg_conf;
 609        int i, j;
 610        bool found = false;
 611        unsigned long config;
 612
 613        mutex_lock(&pinctrl_maps_mutex);
 614
 615        /* Parse the pinctrl map and look for the elected pin/state */
 616        for_each_maps(maps_node, i, map) {
 617                if (map->type != dbg->map_type)
 618                        continue;
 619                if (strcmp(map->dev_name, dbg->dev_name))
 620                        continue;
 621                if (strcmp(map->name, dbg->state_name))
 622                        continue;
 623
 624                for (j = 0; j < map->data.configs.num_configs; j++) {
 625                        if (!strcmp(map->data.configs.group_or_pin,
 626                                        dbg->pin_name)) {
 627                                /*
 628                                 * We found the right pin / state, read the
 629                                 * config and he pctldev for later use
 630                                 */
 631                                configs = &map->data.configs;
 632                                pctldev = get_pinctrl_dev_from_devname
 633                                        (map->ctrl_dev_name);
 634                                found = true;
 635                                break;
 636                        }
 637                }
 638        }
 639
 640        if (!found) {
 641                seq_printf(s, "No config found for dev/state/pin, expected:\n");
 642                seq_printf(s, "Searched dev:%s\n", dbg->dev_name);
 643                seq_printf(s, "Searched state:%s\n", dbg->state_name);
 644                seq_printf(s, "Searched pin:%s\n", dbg->pin_name);
 645                seq_printf(s, "Use: modify config_pin <devname> "\
 646                                "<state> <pinname> <value>\n");
 647                goto exit;
 648        }
 649
 650        config = *(configs->configs);
 651        seq_printf(s, "Dev %s has config of %s in state %s: 0x%08lX\n",
 652                        dbg->dev_name, dbg->pin_name,
 653                        dbg->state_name, config);
 654
 655        if (pctldev)
 656                confops = pctldev->desc->confops;
 657
 658        if (confops && confops->pin_config_config_dbg_show)
 659                confops->pin_config_config_dbg_show(pctldev, s, config);
 660
 661exit:
 662        mutex_unlock(&pinctrl_maps_mutex);
 663
 664        return 0;
 665}
 666
 667/**
 668 * pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl
 669 * map, of a dev/pin/state entry based on user entries to pinconf-config
 670 * @user_buf: contains the modification request with expected format:
 671 *     modify config_pin <devicename> <state> <pinname> <newvalue>
 672 * modify is literal string, alternatives like add/delete not supported yet
 673 * config_pin is literal, alternatives like config_mux not supported yet
 674 * <devicename> <state> <pinname> are values that should match the pinctrl-maps
 675 * <newvalue> reflects the new config and is driver dependant
 676 */
 677static int pinconf_dbg_config_write(struct file *file,
 678        const char __user *user_buf, size_t count, loff_t *ppos)
 679{
 680        struct pinctrl_maps *maps_node;
 681        const struct pinctrl_map *map;
 682        struct pinctrl_dev *pctldev = NULL;
 683        const struct pinconf_ops *confops = NULL;
 684        struct dbg_cfg *dbg = &pinconf_dbg_conf;
 685        const struct pinctrl_map_configs *configs;
 686        char config[MAX_NAME_LEN+1];
 687        bool found = false;
 688        char buf[128];
 689        char *b = &buf[0];
 690        int buf_size;
 691        char *token;
 692        int i;
 693
 694        /* Get userspace string and assure termination */
 695        buf_size = min(count, (sizeof(buf)-1));
 696        if (copy_from_user(buf, user_buf, buf_size))
 697                return -EFAULT;
 698        buf[buf_size] = 0;
 699
 700        /*
 701         * need to parse entry and extract parameters:
 702         * modify configs_pin devicename state pinname newvalue
 703         */
 704
 705        /* Get arg: 'modify' */
 706        token = strsep(&b, " ");
 707        if (!token)
 708                return -EINVAL;
 709        if (strcmp(token, "modify"))
 710                return -EINVAL;
 711
 712        /* Get arg type: "config_pin" type supported so far */
 713        token = strsep(&b, " ");
 714        if (!token)
 715                return -EINVAL;
 716        if (strcmp(token, "config_pin"))
 717                return -EINVAL;
 718        dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
 719
 720        /* get arg 'device_name' */
 721        token = strsep(&b, " ");
 722        if (token == NULL)
 723                return -EINVAL;
 724        if (strlen(token) >= MAX_NAME_LEN)
 725                return -EINVAL;
 726        strncpy(dbg->dev_name, token, MAX_NAME_LEN);
 727
 728        /* get arg 'state_name' */
 729        token = strsep(&b, " ");
 730        if (token == NULL)
 731                return -EINVAL;
 732        if (strlen(token) >= MAX_NAME_LEN)
 733                return -EINVAL;
 734        strncpy(dbg->state_name, token, MAX_NAME_LEN);
 735
 736        /* get arg 'pin_name' */
 737        token = strsep(&b, " ");
 738        if (token == NULL)
 739                return -EINVAL;
 740        if (strlen(token) >= MAX_NAME_LEN)
 741                return -EINVAL;
 742        strncpy(dbg->pin_name, token, MAX_NAME_LEN);
 743
 744        /* get new_value of config' */
 745        token = strsep(&b, " ");
 746        if (token == NULL)
 747                return -EINVAL;
 748        if (strlen(token) >= MAX_NAME_LEN)
 749                return -EINVAL;
 750        strncpy(config, token, MAX_NAME_LEN);
 751
 752        mutex_lock(&pinctrl_maps_mutex);
 753
 754        /* Parse the pinctrl map and look for the selected dev/state/pin */
 755        for_each_maps(maps_node, i, map) {
 756                if (strcmp(map->dev_name, dbg->dev_name))
 757                        continue;
 758                if (map->type != dbg->map_type)
 759                        continue;
 760                if (strcmp(map->name, dbg->state_name))
 761                        continue;
 762
 763                /*  we found the right pin / state, so overwrite config */
 764                if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
 765                        found = true;
 766                        pctldev = get_pinctrl_dev_from_devname(
 767                                        map->ctrl_dev_name);
 768                        configs = &map->data.configs;
 769                        break;
 770                }
 771        }
 772
 773        if (!found) {
 774                count = -EINVAL;
 775                goto exit;
 776        }
 777
 778        if (pctldev)
 779                confops = pctldev->desc->confops;
 780
 781        if (confops && confops->pin_config_dbg_parse_modify) {
 782                for (i = 0; i < configs->num_configs; i++) {
 783                        confops->pin_config_dbg_parse_modify(pctldev,
 784                                                     config,
 785                                                     &configs->configs[i]);
 786                }
 787        }
 788
 789exit:
 790        mutex_unlock(&pinctrl_maps_mutex);
 791
 792        return count;
 793}
 794
 795static int pinconf_dbg_config_open(struct inode *inode, struct file *file)
 796{
 797        return single_open(file, pinconf_dbg_config_print, inode->i_private);
 798}
 799
 800static const struct file_operations pinconf_dbg_pinconfig_fops = {
 801        .open = pinconf_dbg_config_open,
 802        .write = pinconf_dbg_config_write,
 803        .read = seq_read,
 804        .llseek = seq_lseek,
 805        .release = single_release,
 806        .owner = THIS_MODULE,
 807};
 808
 809void pinconf_init_device_debugfs(struct dentry *devroot,
 810                         struct pinctrl_dev *pctldev)
 811{
 812        debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO,
 813                            devroot, pctldev, &pinconf_pins_ops);
 814        debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO,
 815                            devroot, pctldev, &pinconf_groups_ops);
 816        debugfs_create_file("pinconf-config",  (S_IRUGO | S_IWUSR | S_IWGRP),
 817                            devroot, pctldev, &pinconf_dbg_pinconfig_fops);
 818}
 819
 820#endif
 821
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