linux/sound/spi/at73c213.c
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   1/*
   2 * Driver for AT73C213 16-bit stereo DAC connected to Atmel SSC
   3 *
   4 * Copyright (C) 2006-2007 Atmel Norway
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms of the GNU General Public License version 2 as published by
   8 * the Free Software Foundation.
   9 */
  10
  11/*#define DEBUG*/
  12
  13#include <linux/clk.h>
  14#include <linux/err.h>
  15#include <linux/delay.h>
  16#include <linux/device.h>
  17#include <linux/dma-mapping.h>
  18#include <linux/init.h>
  19#include <linux/interrupt.h>
  20#include <linux/module.h>
  21#include <linux/mutex.h>
  22#include <linux/platform_device.h>
  23#include <linux/io.h>
  24
  25#include <sound/initval.h>
  26#include <sound/control.h>
  27#include <sound/core.h>
  28#include <sound/pcm.h>
  29
  30#include <linux/atmel-ssc.h>
  31
  32#include <linux/spi/spi.h>
  33#include <linux/spi/at73c213.h>
  34
  35#include "at73c213.h"
  36
  37#define BITRATE_MIN      8000 /* Hardware limit? */
  38#define BITRATE_TARGET  CONFIG_SND_AT73C213_TARGET_BITRATE
  39#define BITRATE_MAX     50000 /* Hardware limit. */
  40
  41/* Initial (hardware reset) AT73C213 register values. */
  42static u8 snd_at73c213_original_image[18] =
  43{
  44        0x00,   /* 00 - CTRL    */
  45        0x05,   /* 01 - LLIG    */
  46        0x05,   /* 02 - RLIG    */
  47        0x08,   /* 03 - LPMG    */
  48        0x08,   /* 04 - RPMG    */
  49        0x00,   /* 05 - LLOG    */
  50        0x00,   /* 06 - RLOG    */
  51        0x22,   /* 07 - OLC     */
  52        0x09,   /* 08 - MC      */
  53        0x00,   /* 09 - CSFC    */
  54        0x00,   /* 0A - MISC    */
  55        0x00,   /* 0B -         */
  56        0x00,   /* 0C - PRECH   */
  57        0x05,   /* 0D - AUXG    */
  58        0x00,   /* 0E -         */
  59        0x00,   /* 0F -         */
  60        0x00,   /* 10 - RST     */
  61        0x00,   /* 11 - PA_CTRL */
  62};
  63
  64struct snd_at73c213 {
  65        struct snd_card                 *card;
  66        struct snd_pcm                  *pcm;
  67        struct snd_pcm_substream        *substream;
  68        struct at73c213_board_info      *board;
  69        int                             irq;
  70        int                             period;
  71        unsigned long                   bitrate;
  72        struct ssc_device               *ssc;
  73        struct spi_device               *spi;
  74        u8                              spi_wbuffer[2];
  75        u8                              spi_rbuffer[2];
  76        /* Image of the SPI registers in AT73C213. */
  77        u8                              reg_image[18];
  78        /* Protect SSC registers against concurrent access. */
  79        spinlock_t                      lock;
  80        /* Protect mixer registers against concurrent access. */
  81        struct mutex                    mixer_lock;
  82};
  83
  84#define get_chip(card) ((struct snd_at73c213 *)card->private_data)
  85
  86static int
  87snd_at73c213_write_reg(struct snd_at73c213 *chip, u8 reg, u8 val)
  88{
  89        struct spi_message msg;
  90        struct spi_transfer msg_xfer = {
  91                .len            = 2,
  92                .cs_change      = 0,
  93        };
  94        int retval;
  95
  96        spi_message_init(&msg);
  97
  98        chip->spi_wbuffer[0] = reg;
  99        chip->spi_wbuffer[1] = val;
 100
 101        msg_xfer.tx_buf = chip->spi_wbuffer;
 102        msg_xfer.rx_buf = chip->spi_rbuffer;
 103        spi_message_add_tail(&msg_xfer, &msg);
 104
 105        retval = spi_sync(chip->spi, &msg);
 106
 107        if (!retval)
 108                chip->reg_image[reg] = val;
 109
 110        return retval;
 111}
 112
 113static struct snd_pcm_hardware snd_at73c213_playback_hw = {
 114        .info           = SNDRV_PCM_INFO_INTERLEAVED |
 115                          SNDRV_PCM_INFO_BLOCK_TRANSFER,
 116        .formats        = SNDRV_PCM_FMTBIT_S16_BE,
 117        .rates          = SNDRV_PCM_RATE_CONTINUOUS,
 118        .rate_min       = 8000,  /* Replaced by chip->bitrate later. */
 119        .rate_max       = 50000, /* Replaced by chip->bitrate later. */
 120        .channels_min   = 1,
 121        .channels_max   = 2,
 122        .buffer_bytes_max = 64 * 1024 - 1,
 123        .period_bytes_min = 512,
 124        .period_bytes_max = 64 * 1024 - 1,
 125        .periods_min    = 4,
 126        .periods_max    = 1024,
 127};
 128
 129/*
 130 * Calculate and set bitrate and divisions.
 131 */
 132static int snd_at73c213_set_bitrate(struct snd_at73c213 *chip)
 133{
 134        unsigned long ssc_rate = clk_get_rate(chip->ssc->clk);
 135        unsigned long dac_rate_new, ssc_div;
 136        int status;
 137        unsigned long ssc_div_max, ssc_div_min;
 138        int max_tries;
 139
 140        /*
 141         * We connect two clocks here, picking divisors so the I2S clocks
 142         * out data at the same rate the DAC clocks it in ... and as close
 143         * as practical to the desired target rate.
 144         *
 145         * The DAC master clock (MCLK) is programmable, and is either 256
 146         * or (not here) 384 times the I2S output clock (BCLK).
 147         */
 148
 149        /* SSC clock / (bitrate * stereo * 16-bit). */
 150        ssc_div = ssc_rate / (BITRATE_TARGET * 2 * 16);
 151        ssc_div_min = ssc_rate / (BITRATE_MAX * 2 * 16);
 152        ssc_div_max = ssc_rate / (BITRATE_MIN * 2 * 16);
 153        max_tries = (ssc_div_max - ssc_div_min) / 2;
 154
 155        if (max_tries < 1)
 156                max_tries = 1;
 157
 158        /* ssc_div must be even. */
 159        ssc_div = (ssc_div + 1) & ~1UL;
 160
 161        if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN) {
 162                ssc_div -= 2;
 163                if ((ssc_rate / (ssc_div * 2 * 16)) > BITRATE_MAX)
 164                        return -ENXIO;
 165        }
 166
 167        /* Search for a possible bitrate. */
 168        do {
 169                /* SSC clock / (ssc divider * 16-bit * stereo). */
 170                if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN)
 171                        return -ENXIO;
 172
 173                /* 256 / (2 * 16) = 8 */
 174                dac_rate_new = 8 * (ssc_rate / ssc_div);
 175
 176                status = clk_round_rate(chip->board->dac_clk, dac_rate_new);
 177                if (status < 0)
 178                        return status;
 179
 180                /* Ignore difference smaller than 256 Hz. */
 181                if ((status/256) == (dac_rate_new/256))
 182                        goto set_rate;
 183
 184                ssc_div += 2;
 185        } while (--max_tries);
 186
 187        /* Not able to find a valid bitrate. */
 188        return -ENXIO;
 189
 190set_rate:
 191        status = clk_set_rate(chip->board->dac_clk, status);
 192        if (status < 0)
 193                return status;
 194
 195        /* Set divider in SSC device. */
 196        ssc_writel(chip->ssc->regs, CMR, ssc_div/2);
 197
 198        /* SSC clock / (ssc divider * 16-bit * stereo). */
 199        chip->bitrate = ssc_rate / (ssc_div * 16 * 2);
 200
 201        dev_info(&chip->spi->dev,
 202                        "at73c213: supported bitrate is %lu (%lu divider)\n",
 203                        chip->bitrate, ssc_div);
 204
 205        return 0;
 206}
 207
 208static int snd_at73c213_pcm_open(struct snd_pcm_substream *substream)
 209{
 210        struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
 211        struct snd_pcm_runtime *runtime = substream->runtime;
 212        int err;
 213
 214        /* ensure buffer_size is a multiple of period_size */
 215        err = snd_pcm_hw_constraint_integer(runtime,
 216                                        SNDRV_PCM_HW_PARAM_PERIODS);
 217        if (err < 0)
 218                return err;
 219        snd_at73c213_playback_hw.rate_min = chip->bitrate;
 220        snd_at73c213_playback_hw.rate_max = chip->bitrate;
 221        runtime->hw = snd_at73c213_playback_hw;
 222        chip->substream = substream;
 223
 224        return 0;
 225}
 226
 227static int snd_at73c213_pcm_close(struct snd_pcm_substream *substream)
 228{
 229        struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
 230        chip->substream = NULL;
 231        return 0;
 232}
 233
 234static int snd_at73c213_pcm_hw_params(struct snd_pcm_substream *substream,
 235                                 struct snd_pcm_hw_params *hw_params)
 236{
 237        struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
 238        int channels = params_channels(hw_params);
 239        int val;
 240
 241        val = ssc_readl(chip->ssc->regs, TFMR);
 242        val = SSC_BFINS(TFMR_DATNB, channels - 1, val);
 243        ssc_writel(chip->ssc->regs, TFMR, val);
 244
 245        return snd_pcm_lib_malloc_pages(substream,
 246                                        params_buffer_bytes(hw_params));
 247}
 248
 249static int snd_at73c213_pcm_hw_free(struct snd_pcm_substream *substream)
 250{
 251        return snd_pcm_lib_free_pages(substream);
 252}
 253
 254static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream)
 255{
 256        struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
 257        struct snd_pcm_runtime *runtime = substream->runtime;
 258        int block_size;
 259
 260        block_size = frames_to_bytes(runtime, runtime->period_size);
 261
 262        chip->period = 0;
 263
 264        ssc_writel(chip->ssc->regs, PDC_TPR,
 265                        (long)runtime->dma_addr);
 266        ssc_writel(chip->ssc->regs, PDC_TCR,
 267                        runtime->period_size * runtime->channels);
 268        ssc_writel(chip->ssc->regs, PDC_TNPR,
 269                        (long)runtime->dma_addr + block_size);
 270        ssc_writel(chip->ssc->regs, PDC_TNCR,
 271                        runtime->period_size * runtime->channels);
 272
 273        return 0;
 274}
 275
 276static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream,
 277                                   int cmd)
 278{
 279        struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
 280        int retval = 0;
 281
 282        spin_lock(&chip->lock);
 283
 284        switch (cmd) {
 285        case SNDRV_PCM_TRIGGER_START:
 286                ssc_writel(chip->ssc->regs, IER, SSC_BIT(IER_ENDTX));
 287                ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTEN));
 288                break;
 289        case SNDRV_PCM_TRIGGER_STOP:
 290                ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTDIS));
 291                ssc_writel(chip->ssc->regs, IDR, SSC_BIT(IDR_ENDTX));
 292                break;
 293        default:
 294                dev_dbg(&chip->spi->dev, "spurious command %x\n", cmd);
 295                retval = -EINVAL;
 296                break;
 297        }
 298
 299        spin_unlock(&chip->lock);
 300
 301        return retval;
 302}
 303
 304static snd_pcm_uframes_t
 305snd_at73c213_pcm_pointer(struct snd_pcm_substream *substream)
 306{
 307        struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
 308        struct snd_pcm_runtime *runtime = substream->runtime;
 309        snd_pcm_uframes_t pos;
 310        unsigned long bytes;
 311
 312        bytes = ssc_readl(chip->ssc->regs, PDC_TPR)
 313                - (unsigned long)runtime->dma_addr;
 314
 315        pos = bytes_to_frames(runtime, bytes);
 316        if (pos >= runtime->buffer_size)
 317                pos -= runtime->buffer_size;
 318
 319        return pos;
 320}
 321
 322static struct snd_pcm_ops at73c213_playback_ops = {
 323        .open           = snd_at73c213_pcm_open,
 324        .close          = snd_at73c213_pcm_close,
 325        .ioctl          = snd_pcm_lib_ioctl,
 326        .hw_params      = snd_at73c213_pcm_hw_params,
 327        .hw_free        = snd_at73c213_pcm_hw_free,
 328        .prepare        = snd_at73c213_pcm_prepare,
 329        .trigger        = snd_at73c213_pcm_trigger,
 330        .pointer        = snd_at73c213_pcm_pointer,
 331};
 332
 333static int __devinit snd_at73c213_pcm_new(struct snd_at73c213 *chip, int device)
 334{
 335        struct snd_pcm *pcm;
 336        int retval;
 337
 338        retval = snd_pcm_new(chip->card, chip->card->shortname,
 339                        device, 1, 0, &pcm);
 340        if (retval < 0)
 341                goto out;
 342
 343        pcm->private_data = chip;
 344        pcm->info_flags = SNDRV_PCM_INFO_BLOCK_TRANSFER;
 345        strcpy(pcm->name, "at73c213");
 346        chip->pcm = pcm;
 347
 348        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &at73c213_playback_ops);
 349
 350        retval = snd_pcm_lib_preallocate_pages_for_all(chip->pcm,
 351                        SNDRV_DMA_TYPE_DEV, &chip->ssc->pdev->dev,
 352                        64 * 1024, 64 * 1024);
 353out:
 354        return retval;
 355}
 356
 357static irqreturn_t snd_at73c213_interrupt(int irq, void *dev_id)
 358{
 359        struct snd_at73c213 *chip = dev_id;
 360        struct snd_pcm_runtime *runtime = chip->substream->runtime;
 361        u32 status;
 362        int offset;
 363        int block_size;
 364        int next_period;
 365        int retval = IRQ_NONE;
 366
 367        spin_lock(&chip->lock);
 368
 369        block_size = frames_to_bytes(runtime, runtime->period_size);
 370        status = ssc_readl(chip->ssc->regs, IMR);
 371
 372        if (status & SSC_BIT(IMR_ENDTX)) {
 373                chip->period++;
 374                if (chip->period == runtime->periods)
 375                        chip->period = 0;
 376                next_period = chip->period + 1;
 377                if (next_period == runtime->periods)
 378                        next_period = 0;
 379
 380                offset = block_size * next_period;
 381
 382                ssc_writel(chip->ssc->regs, PDC_TNPR,
 383                                (long)runtime->dma_addr + offset);
 384                ssc_writel(chip->ssc->regs, PDC_TNCR,
 385                                runtime->period_size * runtime->channels);
 386                retval = IRQ_HANDLED;
 387        }
 388
 389        ssc_readl(chip->ssc->regs, IMR);
 390        spin_unlock(&chip->lock);
 391
 392        if (status & SSC_BIT(IMR_ENDTX))
 393                snd_pcm_period_elapsed(chip->substream);
 394
 395        return retval;
 396}
 397
 398/*
 399 * Mixer functions.
 400 */
 401static int snd_at73c213_mono_get(struct snd_kcontrol *kcontrol,
 402                                 struct snd_ctl_elem_value *ucontrol)
 403{
 404        struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 405        int reg = kcontrol->private_value & 0xff;
 406        int shift = (kcontrol->private_value >> 8) & 0xff;
 407        int mask = (kcontrol->private_value >> 16) & 0xff;
 408        int invert = (kcontrol->private_value >> 24) & 0xff;
 409
 410        mutex_lock(&chip->mixer_lock);
 411
 412        ucontrol->value.integer.value[0] =
 413                (chip->reg_image[reg] >> shift) & mask;
 414
 415        if (invert)
 416                ucontrol->value.integer.value[0] =
 417                        mask - ucontrol->value.integer.value[0];
 418
 419        mutex_unlock(&chip->mixer_lock);
 420
 421        return 0;
 422}
 423
 424static int snd_at73c213_mono_put(struct snd_kcontrol *kcontrol,
 425                                 struct snd_ctl_elem_value *ucontrol)
 426{
 427        struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 428        int reg = kcontrol->private_value & 0xff;
 429        int shift = (kcontrol->private_value >> 8) & 0xff;
 430        int mask = (kcontrol->private_value >> 16) & 0xff;
 431        int invert = (kcontrol->private_value >> 24) & 0xff;
 432        int change, retval;
 433        unsigned short val;
 434
 435        val = (ucontrol->value.integer.value[0] & mask);
 436        if (invert)
 437                val = mask - val;
 438        val <<= shift;
 439
 440        mutex_lock(&chip->mixer_lock);
 441
 442        val = (chip->reg_image[reg] & ~(mask << shift)) | val;
 443        change = val != chip->reg_image[reg];
 444        retval = snd_at73c213_write_reg(chip, reg, val);
 445
 446        mutex_unlock(&chip->mixer_lock);
 447
 448        if (retval)
 449                return retval;
 450
 451        return change;
 452}
 453
 454static int snd_at73c213_stereo_info(struct snd_kcontrol *kcontrol,
 455                                  struct snd_ctl_elem_info *uinfo)
 456{
 457        int mask = (kcontrol->private_value >> 24) & 0xff;
 458
 459        if (mask == 1)
 460                uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 461        else
 462                uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 463
 464        uinfo->count = 2;
 465        uinfo->value.integer.min = 0;
 466        uinfo->value.integer.max = mask;
 467
 468        return 0;
 469}
 470
 471static int snd_at73c213_stereo_get(struct snd_kcontrol *kcontrol,
 472                                 struct snd_ctl_elem_value *ucontrol)
 473{
 474        struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 475        int left_reg = kcontrol->private_value & 0xff;
 476        int right_reg = (kcontrol->private_value >> 8) & 0xff;
 477        int shift_left = (kcontrol->private_value >> 16) & 0x07;
 478        int shift_right = (kcontrol->private_value >> 19) & 0x07;
 479        int mask = (kcontrol->private_value >> 24) & 0xff;
 480        int invert = (kcontrol->private_value >> 22) & 1;
 481
 482        mutex_lock(&chip->mixer_lock);
 483
 484        ucontrol->value.integer.value[0] =
 485                (chip->reg_image[left_reg] >> shift_left) & mask;
 486        ucontrol->value.integer.value[1] =
 487                (chip->reg_image[right_reg] >> shift_right) & mask;
 488
 489        if (invert) {
 490                ucontrol->value.integer.value[0] =
 491                        mask - ucontrol->value.integer.value[0];
 492                ucontrol->value.integer.value[1] =
 493                        mask - ucontrol->value.integer.value[1];
 494        }
 495
 496        mutex_unlock(&chip->mixer_lock);
 497
 498        return 0;
 499}
 500
 501static int snd_at73c213_stereo_put(struct snd_kcontrol *kcontrol,
 502                                 struct snd_ctl_elem_value *ucontrol)
 503{
 504        struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 505        int left_reg = kcontrol->private_value & 0xff;
 506        int right_reg = (kcontrol->private_value >> 8) & 0xff;
 507        int shift_left = (kcontrol->private_value >> 16) & 0x07;
 508        int shift_right = (kcontrol->private_value >> 19) & 0x07;
 509        int mask = (kcontrol->private_value >> 24) & 0xff;
 510        int invert = (kcontrol->private_value >> 22) & 1;
 511        int change, retval;
 512        unsigned short val1, val2;
 513
 514        val1 = ucontrol->value.integer.value[0] & mask;
 515        val2 = ucontrol->value.integer.value[1] & mask;
 516        if (invert) {
 517                val1 = mask - val1;
 518                val2 = mask - val2;
 519        }
 520        val1 <<= shift_left;
 521        val2 <<= shift_right;
 522
 523        mutex_lock(&chip->mixer_lock);
 524
 525        val1 = (chip->reg_image[left_reg] & ~(mask << shift_left)) | val1;
 526        val2 = (chip->reg_image[right_reg] & ~(mask << shift_right)) | val2;
 527        change = val1 != chip->reg_image[left_reg]
 528                || val2 != chip->reg_image[right_reg];
 529        retval = snd_at73c213_write_reg(chip, left_reg, val1);
 530        if (retval) {
 531                mutex_unlock(&chip->mixer_lock);
 532                goto out;
 533        }
 534        retval = snd_at73c213_write_reg(chip, right_reg, val2);
 535        if (retval) {
 536                mutex_unlock(&chip->mixer_lock);
 537                goto out;
 538        }
 539
 540        mutex_unlock(&chip->mixer_lock);
 541
 542        return change;
 543
 544out:
 545        return retval;
 546}
 547
 548#define snd_at73c213_mono_switch_info   snd_ctl_boolean_mono_info
 549
 550static int snd_at73c213_mono_switch_get(struct snd_kcontrol *kcontrol,
 551                                 struct snd_ctl_elem_value *ucontrol)
 552{
 553        struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 554        int reg = kcontrol->private_value & 0xff;
 555        int shift = (kcontrol->private_value >> 8) & 0xff;
 556        int invert = (kcontrol->private_value >> 24) & 0xff;
 557
 558        mutex_lock(&chip->mixer_lock);
 559
 560        ucontrol->value.integer.value[0] =
 561                (chip->reg_image[reg] >> shift) & 0x01;
 562
 563        if (invert)
 564                ucontrol->value.integer.value[0] =
 565                        0x01 - ucontrol->value.integer.value[0];
 566
 567        mutex_unlock(&chip->mixer_lock);
 568
 569        return 0;
 570}
 571
 572static int snd_at73c213_mono_switch_put(struct snd_kcontrol *kcontrol,
 573                                 struct snd_ctl_elem_value *ucontrol)
 574{
 575        struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 576        int reg = kcontrol->private_value & 0xff;
 577        int shift = (kcontrol->private_value >> 8) & 0xff;
 578        int mask = (kcontrol->private_value >> 16) & 0xff;
 579        int invert = (kcontrol->private_value >> 24) & 0xff;
 580        int change, retval;
 581        unsigned short val;
 582
 583        if (ucontrol->value.integer.value[0])
 584                val = mask;
 585        else
 586                val = 0;
 587
 588        if (invert)
 589                val = mask - val;
 590        val <<= shift;
 591
 592        mutex_lock(&chip->mixer_lock);
 593
 594        val |= (chip->reg_image[reg] & ~(mask << shift));
 595        change = val != chip->reg_image[reg];
 596
 597        retval = snd_at73c213_write_reg(chip, reg, val);
 598
 599        mutex_unlock(&chip->mixer_lock);
 600
 601        if (retval)
 602                return retval;
 603
 604        return change;
 605}
 606
 607static int snd_at73c213_pa_volume_info(struct snd_kcontrol *kcontrol,
 608                                  struct snd_ctl_elem_info *uinfo)
 609{
 610        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 611        uinfo->count = 1;
 612        uinfo->value.integer.min = 0;
 613        uinfo->value.integer.max = ((kcontrol->private_value >> 16) & 0xff) - 1;
 614
 615        return 0;
 616}
 617
 618static int snd_at73c213_line_capture_volume_info(
 619                struct snd_kcontrol *kcontrol,
 620                struct snd_ctl_elem_info *uinfo)
 621{
 622        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 623        uinfo->count = 2;
 624        /* When inverted will give values 0x10001 => 0. */
 625        uinfo->value.integer.min = 14;
 626        uinfo->value.integer.max = 31;
 627
 628        return 0;
 629}
 630
 631static int snd_at73c213_aux_capture_volume_info(
 632                struct snd_kcontrol *kcontrol,
 633                struct snd_ctl_elem_info *uinfo)
 634{
 635        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 636        uinfo->count = 1;
 637        /* When inverted will give values 0x10001 => 0. */
 638        uinfo->value.integer.min = 14;
 639        uinfo->value.integer.max = 31;
 640
 641        return 0;
 642}
 643
 644#define AT73C213_MONO_SWITCH(xname, xindex, reg, shift, mask, invert)   \
 645{                                                                       \
 646        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,                            \
 647        .name = xname,                                                  \
 648        .index = xindex,                                                \
 649        .info = snd_at73c213_mono_switch_info,                          \
 650        .get = snd_at73c213_mono_switch_get,                            \
 651        .put = snd_at73c213_mono_switch_put,                            \
 652        .private_value = (reg | (shift << 8) | (mask << 16) | (invert << 24)) \
 653}
 654
 655#define AT73C213_STEREO(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \
 656{                                                                       \
 657        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,                            \
 658        .name = xname,                                                  \
 659        .index = xindex,                                                \
 660        .info = snd_at73c213_stereo_info,                               \
 661        .get = snd_at73c213_stereo_get,                                 \
 662        .put = snd_at73c213_stereo_put,                                 \
 663        .private_value = (left_reg | (right_reg << 8)                   \
 664                        | (shift_left << 16) | (shift_right << 19)      \
 665                        | (mask << 24) | (invert << 22))                \
 666}
 667
 668static struct snd_kcontrol_new snd_at73c213_controls[] __devinitdata = {
 669AT73C213_STEREO("Master Playback Volume", 0, DAC_LMPG, DAC_RMPG, 0, 0, 0x1f, 1),
 670AT73C213_STEREO("Master Playback Switch", 0, DAC_LMPG, DAC_RMPG, 5, 5, 1, 1),
 671AT73C213_STEREO("PCM Playback Volume", 0, DAC_LLOG, DAC_RLOG, 0, 0, 0x1f, 1),
 672AT73C213_STEREO("PCM Playback Switch", 0, DAC_LLOG, DAC_RLOG, 5, 5, 1, 1),
 673AT73C213_MONO_SWITCH("Mono PA Playback Switch", 0, DAC_CTRL, DAC_CTRL_ONPADRV,
 674                     0x01, 0),
 675{
 676        .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
 677        .name   = "PA Playback Volume",
 678        .index  = 0,
 679        .info   = snd_at73c213_pa_volume_info,
 680        .get    = snd_at73c213_mono_get,
 681        .put    = snd_at73c213_mono_put,
 682        .private_value  = PA_CTRL | (PA_CTRL_APAGAIN << 8) | \
 683                (0x0f << 16) | (1 << 24),
 684},
 685AT73C213_MONO_SWITCH("PA High Gain Playback Switch", 0, PA_CTRL, PA_CTRL_APALP,
 686                     0x01, 1),
 687AT73C213_MONO_SWITCH("PA Playback Switch", 0, PA_CTRL, PA_CTRL_APAON, 0x01, 0),
 688{
 689        .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
 690        .name   = "Aux Capture Volume",
 691        .index  = 0,
 692        .info   = snd_at73c213_aux_capture_volume_info,
 693        .get    = snd_at73c213_mono_get,
 694        .put    = snd_at73c213_mono_put,
 695        .private_value  = DAC_AUXG | (0 << 8) | (0x1f << 16) | (1 << 24),
 696},
 697AT73C213_MONO_SWITCH("Aux Capture Switch", 0, DAC_CTRL, DAC_CTRL_ONAUXIN,
 698                     0x01, 0),
 699{
 700        .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
 701        .name   = "Line Capture Volume",
 702        .index  = 0,
 703        .info   = snd_at73c213_line_capture_volume_info,
 704        .get    = snd_at73c213_stereo_get,
 705        .put    = snd_at73c213_stereo_put,
 706        .private_value  = DAC_LLIG | (DAC_RLIG << 8) | (0 << 16) | (0 << 19)
 707                | (0x1f << 24) | (1 << 22),
 708},
 709AT73C213_MONO_SWITCH("Line Capture Switch", 0, DAC_CTRL, 0, 0x03, 0),
 710};
 711
 712static int __devinit snd_at73c213_mixer(struct snd_at73c213 *chip)
 713{
 714        struct snd_card *card;
 715        int errval, idx;
 716
 717        if (chip == NULL || chip->pcm == NULL)
 718                return -EINVAL;
 719
 720        card = chip->card;
 721
 722        strcpy(card->mixername, chip->pcm->name);
 723
 724        for (idx = 0; idx < ARRAY_SIZE(snd_at73c213_controls); idx++) {
 725                errval = snd_ctl_add(card,
 726                                snd_ctl_new1(&snd_at73c213_controls[idx],
 727                                        chip));
 728                if (errval < 0)
 729                        goto cleanup;
 730        }
 731
 732        return 0;
 733
 734cleanup:
 735        for (idx = 1; idx < ARRAY_SIZE(snd_at73c213_controls) + 1; idx++) {
 736                struct snd_kcontrol *kctl;
 737                kctl = snd_ctl_find_numid(card, idx);
 738                if (kctl)
 739                        snd_ctl_remove(card, kctl);
 740        }
 741        return errval;
 742}
 743
 744/*
 745 * Device functions
 746 */
 747static int __devinit snd_at73c213_ssc_init(struct snd_at73c213 *chip)
 748{
 749        /*
 750         * Continuous clock output.
 751         * Starts on falling TF.
 752         * Delay 1 cycle (1 bit).
 753         * Periode is 16 bit (16 - 1).
 754         */
 755        ssc_writel(chip->ssc->regs, TCMR,
 756                        SSC_BF(TCMR_CKO, 1)
 757                        | SSC_BF(TCMR_START, 4)
 758                        | SSC_BF(TCMR_STTDLY, 1)
 759                        | SSC_BF(TCMR_PERIOD, 16 - 1));
 760        /*
 761         * Data length is 16 bit (16 - 1).
 762         * Transmit MSB first.
 763         * Transmit 2 words each transfer.
 764         * Frame sync length is 16 bit (16 - 1).
 765         * Frame starts on negative pulse.
 766         */
 767        ssc_writel(chip->ssc->regs, TFMR,
 768                        SSC_BF(TFMR_DATLEN, 16 - 1)
 769                        | SSC_BIT(TFMR_MSBF)
 770                        | SSC_BF(TFMR_DATNB, 1)
 771                        | SSC_BF(TFMR_FSLEN, 16 - 1)
 772                        | SSC_BF(TFMR_FSOS, 1));
 773
 774        return 0;
 775}
 776
 777static int __devinit snd_at73c213_chip_init(struct snd_at73c213 *chip)
 778{
 779        int retval;
 780        unsigned char dac_ctrl = 0;
 781
 782        retval = snd_at73c213_set_bitrate(chip);
 783        if (retval)
 784                goto out;
 785
 786        /* Enable DAC master clock. */
 787        clk_enable(chip->board->dac_clk);
 788
 789        /* Initialize at73c213 on SPI bus. */
 790        retval = snd_at73c213_write_reg(chip, DAC_RST, 0x04);
 791        if (retval)
 792                goto out_clk;
 793        msleep(1);
 794        retval = snd_at73c213_write_reg(chip, DAC_RST, 0x03);
 795        if (retval)
 796                goto out_clk;
 797
 798        /* Precharge everything. */
 799        retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0xff);
 800        if (retval)
 801                goto out_clk;
 802        retval = snd_at73c213_write_reg(chip, PA_CTRL, (1<<PA_CTRL_APAPRECH));
 803        if (retval)
 804                goto out_clk;
 805        retval = snd_at73c213_write_reg(chip, DAC_CTRL,
 806                        (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR));
 807        if (retval)
 808                goto out_clk;
 809
 810        msleep(50);
 811
 812        /* Stop precharging PA. */
 813        retval = snd_at73c213_write_reg(chip, PA_CTRL,
 814                        (1<<PA_CTRL_APALP) | 0x0f);
 815        if (retval)
 816                goto out_clk;
 817
 818        msleep(450);
 819
 820        /* Stop precharging DAC, turn on master power. */
 821        retval = snd_at73c213_write_reg(chip, DAC_PRECH, (1<<DAC_PRECH_ONMSTR));
 822        if (retval)
 823                goto out_clk;
 824
 825        msleep(1);
 826
 827        /* Turn on DAC. */
 828        dac_ctrl = (1<<DAC_CTRL_ONDACL) | (1<<DAC_CTRL_ONDACR)
 829                | (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR);
 830
 831        retval = snd_at73c213_write_reg(chip, DAC_CTRL, dac_ctrl);
 832        if (retval)
 833                goto out_clk;
 834
 835        /* Mute sound. */
 836        retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
 837        if (retval)
 838                goto out_clk;
 839        retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
 840        if (retval)
 841                goto out_clk;
 842        retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
 843        if (retval)
 844                goto out_clk;
 845        retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
 846        if (retval)
 847                goto out_clk;
 848        retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
 849        if (retval)
 850                goto out_clk;
 851        retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
 852        if (retval)
 853                goto out_clk;
 854        retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
 855        if (retval)
 856                goto out_clk;
 857
 858        /* Enable I2S device, i.e. clock output. */
 859        ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));
 860
 861        goto out;
 862
 863out_clk:
 864        clk_disable(chip->board->dac_clk);
 865out:
 866        return retval;
 867}
 868
 869static int snd_at73c213_dev_free(struct snd_device *device)
 870{
 871        struct snd_at73c213 *chip = device->device_data;
 872
 873        ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
 874        if (chip->irq >= 0) {
 875                free_irq(chip->irq, chip);
 876                chip->irq = -1;
 877        }
 878
 879        return 0;
 880}
 881
 882static int __devinit snd_at73c213_dev_init(struct snd_card *card,
 883                                         struct spi_device *spi)
 884{
 885        static struct snd_device_ops ops = {
 886                .dev_free       = snd_at73c213_dev_free,
 887        };
 888        struct snd_at73c213 *chip = get_chip(card);
 889        int irq, retval;
 890
 891        irq = chip->ssc->irq;
 892        if (irq < 0)
 893                return irq;
 894
 895        spin_lock_init(&chip->lock);
 896        mutex_init(&chip->mixer_lock);
 897        chip->card = card;
 898        chip->irq = -1;
 899
 900        retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip);
 901        if (retval) {
 902                dev_dbg(&chip->spi->dev, "unable to request irq %d\n", irq);
 903                goto out;
 904        }
 905        chip->irq = irq;
 906
 907        memcpy(&chip->reg_image, &snd_at73c213_original_image,
 908                        sizeof(snd_at73c213_original_image));
 909
 910        retval = snd_at73c213_ssc_init(chip);
 911        if (retval)
 912                goto out_irq;
 913
 914        retval = snd_at73c213_chip_init(chip);
 915        if (retval)
 916                goto out_irq;
 917
 918        retval = snd_at73c213_pcm_new(chip, 0);
 919        if (retval)
 920                goto out_irq;
 921
 922        retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
 923        if (retval)
 924                goto out_irq;
 925
 926        retval = snd_at73c213_mixer(chip);
 927        if (retval)
 928                goto out_snd_dev;
 929
 930        snd_card_set_dev(card, &spi->dev);
 931
 932        goto out;
 933
 934out_snd_dev:
 935        snd_device_free(card, chip);
 936out_irq:
 937        free_irq(chip->irq, chip);
 938        chip->irq = -1;
 939out:
 940        return retval;
 941}
 942
 943static int __devinit snd_at73c213_probe(struct spi_device *spi)
 944{
 945        struct snd_card                 *card;
 946        struct snd_at73c213             *chip;
 947        struct at73c213_board_info      *board;
 948        int                             retval;
 949        char                            id[16];
 950
 951        board = spi->dev.platform_data;
 952        if (!board) {
 953                dev_dbg(&spi->dev, "no platform_data\n");
 954                return -ENXIO;
 955        }
 956
 957        if (!board->dac_clk) {
 958                dev_dbg(&spi->dev, "no DAC clk\n");
 959                return -ENXIO;
 960        }
 961
 962        if (IS_ERR(board->dac_clk)) {
 963                dev_dbg(&spi->dev, "no DAC clk\n");
 964                return PTR_ERR(board->dac_clk);
 965        }
 966
 967        /* Allocate "card" using some unused identifiers. */
 968        snprintf(id, sizeof id, "at73c213_%d", board->ssc_id);
 969        retval = snd_card_create(-1, id, THIS_MODULE,
 970                                 sizeof(struct snd_at73c213), &card);
 971        if (retval < 0)
 972                goto out;
 973
 974        chip = card->private_data;
 975        chip->spi = spi;
 976        chip->board = board;
 977
 978        chip->ssc = ssc_request(board->ssc_id);
 979        if (IS_ERR(chip->ssc)) {
 980                dev_dbg(&spi->dev, "could not get ssc%d device\n",
 981                                board->ssc_id);
 982                retval = PTR_ERR(chip->ssc);
 983                goto out_card;
 984        }
 985
 986        retval = snd_at73c213_dev_init(card, spi);
 987        if (retval)
 988                goto out_ssc;
 989
 990        strcpy(card->driver, "at73c213");
 991        strcpy(card->shortname, board->shortname);
 992        sprintf(card->longname, "%s on irq %d", card->shortname, chip->irq);
 993
 994        retval = snd_card_register(card);
 995        if (retval)
 996                goto out_ssc;
 997
 998        dev_set_drvdata(&spi->dev, card);
 999
1000        goto out;
1001
1002out_ssc:
1003        ssc_free(chip->ssc);
1004out_card:
1005        snd_card_free(card);
1006out:
1007        return retval;
1008}
1009
1010static int __devexit snd_at73c213_remove(struct spi_device *spi)
1011{
1012        struct snd_card *card = dev_get_drvdata(&spi->dev);
1013        struct snd_at73c213 *chip = card->private_data;
1014        int retval;
1015
1016        /* Stop playback. */
1017        ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
1018
1019        /* Mute sound. */
1020        retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
1021        if (retval)
1022                goto out;
1023        retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
1024        if (retval)
1025                goto out;
1026        retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
1027        if (retval)
1028                goto out;
1029        retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
1030        if (retval)
1031                goto out;
1032        retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
1033        if (retval)
1034                goto out;
1035        retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
1036        if (retval)
1037                goto out;
1038        retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
1039        if (retval)
1040                goto out;
1041
1042        /* Turn off PA. */
1043        retval = snd_at73c213_write_reg(chip, PA_CTRL,
1044                                        chip->reg_image[PA_CTRL] | 0x0f);
1045        if (retval)
1046                goto out;
1047        msleep(10);
1048        retval = snd_at73c213_write_reg(chip, PA_CTRL,
1049                                        (1 << PA_CTRL_APALP) | 0x0f);
1050        if (retval)
1051                goto out;
1052
1053        /* Turn off external DAC. */
1054        retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x0c);
1055        if (retval)
1056                goto out;
1057        msleep(2);
1058        retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x00);
1059        if (retval)
1060                goto out;
1061
1062        /* Turn off master power. */
1063        retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0x00);
1064        if (retval)
1065                goto out;
1066
1067out:
1068        /* Stop DAC master clock. */
1069        clk_disable(chip->board->dac_clk);
1070
1071        ssc_free(chip->ssc);
1072        snd_card_free(card);
1073        dev_set_drvdata(&spi->dev, NULL);
1074
1075        return 0;
1076}
1077
1078#ifdef CONFIG_PM
1079static int snd_at73c213_suspend(struct spi_device *spi, pm_message_t msg)
1080{
1081        struct snd_card *card = dev_get_drvdata(&spi->dev);
1082        struct snd_at73c213 *chip = card->private_data;
1083
1084        ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
1085        clk_disable(chip->board->dac_clk);
1086
1087        return 0;
1088}
1089
1090static int snd_at73c213_resume(struct spi_device *spi)
1091{
1092        struct snd_card *card = dev_get_drvdata(&spi->dev);
1093        struct snd_at73c213 *chip = card->private_data;
1094
1095        clk_enable(chip->board->dac_clk);
1096        ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));
1097
1098        return 0;
1099}
1100#else
1101#define snd_at73c213_suspend NULL
1102#define snd_at73c213_resume NULL
1103#endif
1104
1105static struct spi_driver at73c213_driver = {
1106        .driver         = {
1107                .name   = "at73c213",
1108        },
1109        .probe          = snd_at73c213_probe,
1110        .suspend        = snd_at73c213_suspend,
1111        .resume         = snd_at73c213_resume,
1112        .remove         = __devexit_p(snd_at73c213_remove),
1113};
1114
1115module_spi_driver(at73c213_driver);
1116
1117MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
1118MODULE_DESCRIPTION("Sound driver for AT73C213 with Atmel SSC");
1119MODULE_LICENSE("GPL");
1120
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