sound/spi/at73c213.c

   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/platform_device.h>
  22 #include <linux/io.h>
  23
  24 #include <sound/driver.h>
  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. */
  42 static 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
  64 struct 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 clk                      *bitclk;
  73         struct ssc_device               *ssc;
  74         struct spi_device               *spi;
  75         u8                              spi_wbuffer[2];
  76         u8                              spi_rbuffer[2];
  77         /* Image of the SPI registers in AT73C213. */
  78         u8                              reg_image[18];
  79         /* Protect registers against concurrent access. */
  80         spinlock_t                      lock;
  81 };
  82
  83 #define get_chip(card) ((struct snd_at73c213 *)card->private_data)
  84
  85 static int
  86 snd_at73c213_write_reg(struct snd_at73c213 *chip, u8 reg, u8 val)
  87 {
  88         struct spi_message msg;
  89         struct spi_transfer msg_xfer = {
  90                 .len            = 2,
  91                 .cs_change      = 0,
  92         };
  93         int retval;
  94
  95         spi_message_init(&msg);
  96
  97         chip->spi_wbuffer[0] = reg;
  98         chip->spi_wbuffer[1] = val;
  99
 100         msg_xfer.tx_buf = chip->spi_wbuffer;
 101         msg_xfer.rx_buf = chip->spi_rbuffer;
 102         spi_message_add_tail(&msg_xfer, &msg);
 103
 104         retval = spi_sync(chip->spi, &msg);
 105
 106         if (!retval)
 107                 chip->reg_image[reg] = val;
 108
 109         return retval;
 110 }
 111
 112 static struct snd_pcm_hardware snd_at73c213_playback_hw = {
 113         .info           = SNDRV_PCM_INFO_INTERLEAVED |
 114                           SNDRV_PCM_INFO_BLOCK_TRANSFER,
 115         .formats        = SNDRV_PCM_FMTBIT_S16_BE,
 116         .rates          = SNDRV_PCM_RATE_CONTINUOUS,
 117         .rate_min       = 8000,  /* Replaced by chip->bitrate later. */
 118         .rate_max       = 50000, /* Replaced by chip->bitrate later. */
 119         .channels_min   = 2,
 120         .channels_max   = 2,
 121         .buffer_bytes_max = 64 * 1024 - 1,
 122         .period_bytes_min = 512,
 123         .period_bytes_max = 64 * 1024 - 1,
 124         .periods_min    = 4,
 125         .periods_max    = 1024,
 126 };
 127
 128 /*
 129  * Calculate and set bitrate and divisions.
 130  */
 131 static int snd_at73c213_set_bitrate(struct snd_at73c213 *chip)
 132 {
 133         unsigned long ssc_rate = clk_get_rate(chip->ssc->clk);
 134         unsigned long dac_rate_new, ssc_div, status;
 135         unsigned long ssc_div_max, ssc_div_min;
 136         int max_tries;
 137
 138         /*
 139          * We connect two clocks here, picking divisors so the I2S clocks
 140          * out data at the same rate the DAC clocks it in ... and as close
 141          * as practical to the desired target rate.
 142          *
 143          * The DAC master clock (MCLK) is programmable, and is either 256
 144          * or (not here) 384 times the I2S output clock (BCLK).
 145          */
 146
 147         /* SSC clock / (bitrate * stereo * 16-bit). */
 148         ssc_div = ssc_rate / (BITRATE_TARGET * 2 * 16);
 149         ssc_div_min = ssc_rate / (BITRATE_MAX * 2 * 16);
 150         ssc_div_max = ssc_rate / (BITRATE_MIN * 2 * 16);
 151         max_tries = (ssc_div_max - ssc_div_min) / 2;
 152
 153         if (max_tries < 1)
 154                 max_tries = 1;
 155
 156         /* ssc_div must be a power of 2. */
 157         ssc_div = (ssc_div + 1) & ~1UL;
 158
 159         if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN) {
 160                 ssc_div -= 2;
 161                 if ((ssc_rate / (ssc_div * 2 * 16)) > BITRATE_MAX)
 162                         return -ENXIO;
 163         }
 164
 165         /* Search for a possible bitrate. */
 166         do {
 167                 /* SSC clock / (ssc divider * 16-bit * stereo). */
 168                 if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN)
 169                         return -ENXIO;
 170
 171                 /* 256 / (2 * 16) = 8 */
 172                 dac_rate_new = 8 * (ssc_rate / ssc_div);
 173
 174                 status = clk_round_rate(chip->board->dac_clk, dac_rate_new);
 175                 if (status < 0)
 176                         return status;
 177
 178                 /* Ignore difference smaller than 256 Hz. */
 179                 if ((status/256) == (dac_rate_new/256))
 180                         goto set_rate;
 181
 182                 ssc_div += 2;
 183         } while (--max_tries);
 184
 185         /* Not able to find a valid bitrate. */
 186         return -ENXIO;
 187
 188 set_rate:
 189         status = clk_set_rate(chip->board->dac_clk, status);
 190         if (status < 0)
 191                 return status;
 192
 193         /* Set divider in SSC device. */
 194         ssc_writel(chip->ssc->regs, CMR, ssc_div/2);
 195
 196         /* SSC clock / (ssc divider * 16-bit * stereo). */
 197         chip->bitrate = ssc_rate / (ssc_div * 16 * 2);
 198
 199         dev_info(&chip->spi->dev,
 200                         "at73c213: supported bitrate is %lu (%lu divider)\n",
 201                         chip->bitrate, ssc_div);
 202
 203         return 0;
 204 }
 205
 206 static int snd_at73c213_pcm_open(struct snd_pcm_substream *substream)
 207 {
 208         struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
 209         struct snd_pcm_runtime *runtime = substream->runtime;
 210
 211         snd_at73c213_playback_hw.rate_min = chip->bitrate;
 212         snd_at73c213_playback_hw.rate_max = chip->bitrate;
 213         runtime->hw = snd_at73c213_playback_hw;
 214         chip->substream = substream;
 215
 216         return 0;
 217 }
 218
 219 static int snd_at73c213_pcm_close(struct snd_pcm_substream *substream)
 220 {
 221         struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
 222         chip->substream = NULL;
 223         return 0;
 224 }
 225
 226 static int snd_at73c213_pcm_hw_params(struct snd_pcm_substream *substream,
 227                                  struct snd_pcm_hw_params *hw_params)
 228 {
 229         return snd_pcm_lib_malloc_pages(substream,
 230                                         params_buffer_bytes(hw_params));
 231 }
 232
 233 static int snd_at73c213_pcm_hw_free(struct snd_pcm_substream *substream)
 234 {
 235         return snd_pcm_lib_free_pages(substream);
 236 }
 237
 238 static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream)
 239 {
 240         struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
 241         struct snd_pcm_runtime *runtime = substream->runtime;
 242         int block_size;
 243
 244         block_size = frames_to_bytes(runtime, runtime->period_size);
 245
 246         chip->period = 0;
 247
 248         ssc_writel(chip->ssc->regs, PDC_TPR,
 249                         (long)runtime->dma_addr);
 250         ssc_writel(chip->ssc->regs, PDC_TCR, runtime->period_size * 2);
 251         ssc_writel(chip->ssc->regs, PDC_TNPR,
 252                         (long)runtime->dma_addr + block_size);
 253         ssc_writel(chip->ssc->regs, PDC_TNCR, runtime->period_size * 2);
 254
 255         return 0;
 256 }
 257
 258 static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream,
 259                                    int cmd)
 260 {
 261         struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
 262         int retval = 0;
 263
 264         spin_lock(&chip->lock);
 265
 266         switch (cmd) {
 267         case SNDRV_PCM_TRIGGER_START:
 268                 ssc_writel(chip->ssc->regs, IER, SSC_BIT(IER_ENDTX));
 269                 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTEN));
 270                 break;
 271         case SNDRV_PCM_TRIGGER_STOP:
 272                 ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTDIS));
 273                 ssc_writel(chip->ssc->regs, IDR, SSC_BIT(IDR_ENDTX));
 274                 break;
 275         default:
 276                 dev_dbg(&chip->spi->dev, "spurious command %x\n", cmd);
 277                 retval = -EINVAL;
 278                 break;
 279         }
 280
 281         spin_unlock(&chip->lock);
 282
 283         return retval;
 284 }
 285
 286 static snd_pcm_uframes_t
 287 snd_at73c213_pcm_pointer(struct snd_pcm_substream *substream)
 288 {
 289         struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
 290         struct snd_pcm_runtime *runtime = substream->runtime;
 291         snd_pcm_uframes_t pos;
 292         unsigned long bytes;
 293
 294         bytes = ssc_readl(chip->ssc->regs, PDC_TPR)
 295                 - (unsigned long)runtime->dma_addr;
 296
 297         pos = bytes_to_frames(runtime, bytes);
 298         if (pos >= runtime->buffer_size)
 299                 pos -= runtime->buffer_size;
 300
 301         return pos;
 302 }
 303
 304 static struct snd_pcm_ops at73c213_playback_ops = {
 305         .open           = snd_at73c213_pcm_open,
 306         .close          = snd_at73c213_pcm_close,
 307         .ioctl          = snd_pcm_lib_ioctl,
 308         .hw_params      = snd_at73c213_pcm_hw_params,
 309         .hw_free        = snd_at73c213_pcm_hw_free,
 310         .prepare        = snd_at73c213_pcm_prepare,
 311         .trigger        = snd_at73c213_pcm_trigger,
 312         .pointer        = snd_at73c213_pcm_pointer,
 313 };
 314
 315 static void snd_at73c213_pcm_free(struct snd_pcm *pcm)
 316 {
 317         struct snd_at73c213 *chip = snd_pcm_chip(pcm);
 318         if (chip->pcm) {
 319                 snd_pcm_lib_preallocate_free_for_all(chip->pcm);
 320                 chip->pcm = NULL;
 321         }
 322 }
 323
 324 static int __devinit snd_at73c213_pcm_new(struct snd_at73c213 *chip, int device)
 325 {
 326         struct snd_pcm *pcm;
 327         int retval;
 328
 329         retval = snd_pcm_new(chip->card, chip->card->shortname,
 330                         device, 1, 0, &pcm);
 331         if (retval < 0)
 332                 goto out;
 333
 334         pcm->private_data = chip;
 335         pcm->private_free = snd_at73c213_pcm_free;
 336         pcm->info_flags = SNDRV_PCM_INFO_BLOCK_TRANSFER;
 337         strcpy(pcm->name, "at73c213");
 338         chip->pcm = pcm;
 339
 340         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &at73c213_playback_ops);
 341
 342         retval = snd_pcm_lib_preallocate_pages_for_all(chip->pcm,
 343                         SNDRV_DMA_TYPE_DEV, &chip->ssc->pdev->dev,
 344                         64 * 1024, 64 * 1024);
 345 out:
 346         return retval;
 347 }
 348
 349 static irqreturn_t snd_at73c213_interrupt(int irq, void *dev_id)
 350 {
 351         struct snd_at73c213 *chip = dev_id;
 352         struct snd_pcm_runtime *runtime = chip->substream->runtime;
 353         u32 status;
 354         int offset;
 355         int block_size;
 356         int next_period;
 357         int retval = IRQ_NONE;
 358
 359         spin_lock(&chip->lock);
 360
 361         block_size = frames_to_bytes(runtime, runtime->period_size);
 362         status = ssc_readl(chip->ssc->regs, IMR);
 363
 364         if (status & SSC_BIT(IMR_ENDTX)) {
 365                 chip->period++;
 366                 if (chip->period == runtime->periods)
 367                         chip->period = 0;
 368                 next_period = chip->period + 1;
 369                 if (next_period == runtime->periods)
 370                         next_period = 0;
 371
 372                 offset = block_size * next_period;
 373
 374                 ssc_writel(chip->ssc->regs, PDC_TNPR,
 375                                 (long)runtime->dma_addr + offset);
 376                 ssc_writel(chip->ssc->regs, PDC_TNCR, runtime->period_size * 2);
 377                 retval = IRQ_HANDLED;
 378         }
 379
 380         ssc_readl(chip->ssc->regs, IMR);
 381         spin_unlock(&chip->lock);
 382
 383         if (status & SSC_BIT(IMR_ENDTX))
 384                 snd_pcm_period_elapsed(chip->substream);
 385
 386         return retval;
 387 }
 388
 389 /*
 390  * Mixer functions.
 391  */
 392 static int snd_at73c213_mono_get(struct snd_kcontrol *kcontrol,
 393                                  struct snd_ctl_elem_value *ucontrol)
 394 {
 395         struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 396         int reg = kcontrol->private_value & 0xff;
 397         int shift = (kcontrol->private_value >> 8) & 0xff;
 398         int mask = (kcontrol->private_value >> 16) & 0xff;
 399         int invert = (kcontrol->private_value >> 24) & 0xff;
 400
 401         spin_lock_irq(&chip->lock);
 402
 403         ucontrol->value.integer.value[0] =
 404                 (chip->reg_image[reg] >> shift) & mask;
 405
 406         if (invert)
 407                 ucontrol->value.integer.value[0] =
 408                         mask - ucontrol->value.integer.value[0];
 409
 410         spin_unlock_irq(&chip->lock);
 411
 412         return 0;
 413 }
 414
 415 static int snd_at73c213_mono_put(struct snd_kcontrol *kcontrol,
 416                                  struct snd_ctl_elem_value *ucontrol)
 417 {
 418         struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 419         int reg = kcontrol->private_value & 0xff;
 420         int shift = (kcontrol->private_value >> 8) & 0xff;
 421         int mask = (kcontrol->private_value >> 16) & 0xff;
 422         int invert = (kcontrol->private_value >> 24) & 0xff;
 423         int change, retval;
 424         unsigned short val;
 425
 426         val = (ucontrol->value.integer.value[0] & mask);
 427         if (invert)
 428                 val = mask - val;
 429         val <<= shift;
 430
 431         spin_lock_irq(&chip->lock);
 432
 433         val = (chip->reg_image[reg] & ~(mask << shift)) | val;
 434         change = val != chip->reg_image[reg];
 435         retval = snd_at73c213_write_reg(chip, reg, val);
 436
 437         spin_unlock_irq(&chip->lock);
 438
 439         if (retval)
 440                 return retval;
 441
 442         return change;
 443 }
 444
 445 static int snd_at73c213_stereo_info(struct snd_kcontrol *kcontrol,
 446                                   struct snd_ctl_elem_info *uinfo)
 447 {
 448         int mask = (kcontrol->private_value >> 24) & 0xff;
 449
 450         if (mask == 1)
 451                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 452         else
 453                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 454
 455         uinfo->count = 2;
 456         uinfo->value.integer.min = 0;
 457         uinfo->value.integer.max = mask;
 458
 459         return 0;
 460 }
 461
 462 static int snd_at73c213_stereo_get(struct snd_kcontrol *kcontrol,
 463                                  struct snd_ctl_elem_value *ucontrol)
 464 {
 465         struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 466         int left_reg = kcontrol->private_value & 0xff;
 467         int right_reg = (kcontrol->private_value >> 8) & 0xff;
 468         int shift_left = (kcontrol->private_value >> 16) & 0x07;
 469         int shift_right = (kcontrol->private_value >> 19) & 0x07;
 470         int mask = (kcontrol->private_value >> 24) & 0xff;
 471         int invert = (kcontrol->private_value >> 22) & 1;
 472
 473         spin_lock_irq(&chip->lock);
 474
 475         ucontrol->value.integer.value[0] =
 476                 (chip->reg_image[left_reg] >> shift_left) & mask;
 477         ucontrol->value.integer.value[1] =
 478                 (chip->reg_image[right_reg] >> shift_right) & mask;
 479
 480         if (invert) {
 481                 ucontrol->value.integer.value[0] =
 482                         mask - ucontrol->value.integer.value[0];
 483                 ucontrol->value.integer.value[1] =
 484                         mask - ucontrol->value.integer.value[1];
 485         }
 486
 487         spin_unlock_irq(&chip->lock);
 488
 489         return 0;
 490 }
 491
 492 static int snd_at73c213_stereo_put(struct snd_kcontrol *kcontrol,
 493                                  struct snd_ctl_elem_value *ucontrol)
 494 {
 495         struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 496         int left_reg = kcontrol->private_value & 0xff;
 497         int right_reg = (kcontrol->private_value >> 8) & 0xff;
 498         int shift_left = (kcontrol->private_value >> 16) & 0x07;
 499         int shift_right = (kcontrol->private_value >> 19) & 0x07;
 500         int mask = (kcontrol->private_value >> 24) & 0xff;
 501         int invert = (kcontrol->private_value >> 22) & 1;
 502         int change, retval;
 503         unsigned short val1, val2;
 504
 505         val1 = ucontrol->value.integer.value[0] & mask;
 506         val2 = ucontrol->value.integer.value[1] & mask;
 507         if (invert) {
 508                 val1 = mask - val1;
 509                 val2 = mask - val2;
 510         }
 511         val1 <<= shift_left;
 512         val2 <<= shift_right;
 513
 514         spin_lock_irq(&chip->lock);
 515
 516         val1 = (chip->reg_image[left_reg] & ~(mask << shift_left)) | val1;
 517         val2 = (chip->reg_image[right_reg] & ~(mask << shift_right)) | val2;
 518         change = val1 != chip->reg_image[left_reg]
 519                 || val2 != chip->reg_image[right_reg];
 520         retval = snd_at73c213_write_reg(chip, left_reg, val1);
 521         if (retval) {
 522                 spin_unlock_irq(&chip->lock);
 523                 goto out;
 524         }
 525         retval = snd_at73c213_write_reg(chip, right_reg, val2);
 526         if (retval) {
 527                 spin_unlock_irq(&chip->lock);
 528                 goto out;
 529         }
 530
 531         spin_unlock_irq(&chip->lock);
 532
 533         return change;
 534
 535 out:
 536         return retval;
 537 }
 538
 539 #define snd_at73c213_mono_switch_info   snd_ctl_boolean_mono_info
 540
 541 static int snd_at73c213_mono_switch_get(struct snd_kcontrol *kcontrol,
 542                                  struct snd_ctl_elem_value *ucontrol)
 543 {
 544         struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 545         int reg = kcontrol->private_value & 0xff;
 546         int shift = (kcontrol->private_value >> 8) & 0xff;
 547         int invert = (kcontrol->private_value >> 24) & 0xff;
 548
 549         spin_lock_irq(&chip->lock);
 550
 551         ucontrol->value.integer.value[0] =
 552                 (chip->reg_image[reg] >> shift) & 0x01;
 553
 554         if (invert)
 555                 ucontrol->value.integer.value[0] =
 556                         0x01 - ucontrol->value.integer.value[0];
 557
 558         spin_unlock_irq(&chip->lock);
 559
 560         return 0;
 561 }
 562
 563 static int snd_at73c213_mono_switch_put(struct snd_kcontrol *kcontrol,
 564                                  struct snd_ctl_elem_value *ucontrol)
 565 {
 566         struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
 567         int reg = kcontrol->private_value & 0xff;
 568         int shift = (kcontrol->private_value >> 8) & 0xff;
 569         int mask = (kcontrol->private_value >> 16) & 0xff;
 570         int invert = (kcontrol->private_value >> 24) & 0xff;
 571         int change, retval;
 572         unsigned short val;
 573
 574         if (ucontrol->value.integer.value[0])
 575                 val = mask;
 576         else
 577                 val = 0;
 578
 579         if (invert)
 580                 val = mask - val;
 581         val <<= shift;
 582
 583         spin_lock_irq(&chip->lock);
 584
 585         val |= (chip->reg_image[reg] & ~(mask << shift));
 586         change = val != chip->reg_image[reg];
 587
 588         retval = snd_at73c213_write_reg(chip, reg, val);
 589
 590         spin_unlock_irq(&chip->lock);
 591
 592         if (retval)
 593                 return retval;
 594
 595         return change;
 596 }
 597
 598 static int snd_at73c213_pa_volume_info(struct snd_kcontrol *kcontrol,
 599                                   struct snd_ctl_elem_info *uinfo)
 600 {
 601         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 602         uinfo->count = 1;
 603         uinfo->value.integer.min = 0;
 604         uinfo->value.integer.max = ((kcontrol->private_value >> 16) & 0xff) - 1;
 605
 606         return 0;
 607 }
 608
 609 static int snd_at73c213_line_capture_volume_info(
 610                 struct snd_kcontrol *kcontrol,
 611                 struct snd_ctl_elem_info *uinfo)
 612 {
 613         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 614         uinfo->count = 2;
 615         /* When inverted will give values 0x10001 => 0. */
 616         uinfo->value.integer.min = 14;
 617         uinfo->value.integer.max = 31;
 618
 619         return 0;
 620 }
 621
 622 static int snd_at73c213_aux_capture_volume_info(
 623                 struct snd_kcontrol *kcontrol,
 624                 struct snd_ctl_elem_info *uinfo)
 625 {
 626         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 627         uinfo->count = 1;
 628         /* When inverted will give values 0x10001 => 0. */
 629         uinfo->value.integer.min = 14;
 630         uinfo->value.integer.max = 31;
 631
 632         return 0;
 633 }
 634
 635 #define AT73C213_MONO_SWITCH(xname, xindex, reg, shift, mask, invert)   \
 636 {                                                                       \
 637         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,                            \
 638         .name = xname,                                                  \
 639         .index = xindex,                                                \
 640         .info = snd_at73c213_mono_switch_info,                          \
 641         .get = snd_at73c213_mono_switch_get,                            \
 642         .put = snd_at73c213_mono_switch_put,                            \
 643         .private_value = (reg | (shift << 8) | (mask << 16) | (invert << 24)) \
 644 }
 645
 646 #define AT73C213_STEREO(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \
 647 {                                                                       \
 648         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,                            \
 649         .name = xname,                                                  \
 650         .index = xindex,                                                \
 651         .info = snd_at73c213_stereo_info,                               \
 652         .get = snd_at73c213_stereo_get,                                 \
 653         .put = snd_at73c213_stereo_put,                                 \
 654         .private_value = (left_reg | (right_reg << 8)                   \
 655                         | (shift_left << 16) | (shift_right << 19)      \
 656                         | (mask << 24) | (invert << 22))                \
 657 }
 658
 659 static struct snd_kcontrol_new snd_at73c213_controls[] __devinitdata = {
 660 AT73C213_STEREO("Master Playback Volume", 0, DAC_LMPG, DAC_RMPG, 0, 0, 0x1f, 1),
 661 AT73C213_STEREO("Master Playback Switch", 0, DAC_LMPG, DAC_RMPG, 5, 5, 1, 1),
 662 AT73C213_STEREO("PCM Playback Volume", 0, DAC_LLOG, DAC_RLOG, 0, 0, 0x1f, 1),
 663 AT73C213_STEREO("PCM Playback Switch", 0, DAC_LLOG, DAC_RLOG, 5, 5, 1, 1),
 664 AT73C213_MONO_SWITCH("Mono PA Playback Switch", 0, DAC_CTRL, DAC_CTRL_ONPADRV,
 665                      0x01, 0),
 666 {
 667         .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
 668         .name   = "PA Playback Volume",
 669         .index  = 0,
 670         .info   = snd_at73c213_pa_volume_info,
 671         .get    = snd_at73c213_mono_get,
 672         .put    = snd_at73c213_mono_put,
 673         .private_value  = PA_CTRL | (PA_CTRL_APAGAIN << 8) | \
 674                 (0x0f << 16) | (1 << 24),
 675 },
 676 AT73C213_MONO_SWITCH("PA High Gain Playback Switch", 0, PA_CTRL, PA_CTRL_APALP,
 677                      0x01, 1),
 678 AT73C213_MONO_SWITCH("PA Playback Switch", 0, PA_CTRL, PA_CTRL_APAON, 0x01, 0),
 679 {
 680         .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
 681         .name   = "Aux Capture Volume",
 682         .index  = 0,
 683         .info   = snd_at73c213_aux_capture_volume_info,
 684         .get    = snd_at73c213_mono_get,
 685         .put    = snd_at73c213_mono_put,
 686         .private_value  = DAC_AUXG | (0 << 8) | (0x1f << 16) | (1 << 24),
 687 },
 688 AT73C213_MONO_SWITCH("Aux Capture Switch", 0, DAC_CTRL, DAC_CTRL_ONAUXIN,
 689                      0x01, 0),
 690 {
 691         .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
 692         .name   = "Line Capture Volume",
 693         .index  = 0,
 694         .info   = snd_at73c213_line_capture_volume_info,
 695         .get    = snd_at73c213_stereo_get,
 696         .put    = snd_at73c213_stereo_put,
 697         .private_value  = DAC_LLIG | (DAC_RLIG << 8) | (0 << 16) | (0 << 19)
 698                 | (0x1f << 24) | (1 << 22),
 699 },
 700 AT73C213_MONO_SWITCH("Line Capture Switch", 0, DAC_CTRL, 0, 0x03, 0),
 701 };
 702
 703 static int __devinit snd_at73c213_mixer(struct snd_at73c213 *chip)
 704 {
 705         struct snd_card *card;
 706         int errval, idx;
 707
 708         if (chip == NULL || chip->pcm == NULL)
 709                 return -EINVAL;
 710
 711         card = chip->card;
 712
 713         strcpy(card->mixername, chip->pcm->name);
 714
 715         for (idx = 0; idx < ARRAY_SIZE(snd_at73c213_controls); idx++) {
 716                 errval = snd_ctl_add(card,
 717                                 snd_ctl_new1(&snd_at73c213_controls[idx],
 718                                         chip));
 719                 if (errval < 0)
 720                         goto cleanup;
 721         }
 722
 723         return 0;
 724
 725 cleanup:
 726         for (idx = 1; idx < ARRAY_SIZE(snd_at73c213_controls) + 1; idx++) {
 727                 struct snd_kcontrol *kctl;
 728                 kctl = snd_ctl_find_numid(card, idx);
 729                 if (kctl)
 730                         snd_ctl_remove(card, kctl);
 731         }
 732         return errval;
 733 }
 734
 735 /*
 736  * Device functions
 737  */
 738 static int snd_at73c213_ssc_init(struct snd_at73c213 *chip)
 739 {
 740         /*
 741          * Continuous clock output.
 742          * Starts on falling TF.
 743          * Delay 1 cycle (1 bit).
 744          * Periode is 16 bit (16 - 1).
 745          */
 746         ssc_writel(chip->ssc->regs, TCMR,
 747                         SSC_BF(TCMR_CKO, 1)
 748                         | SSC_BF(TCMR_START, 4)
 749                         | SSC_BF(TCMR_STTDLY, 1)
 750                         | SSC_BF(TCMR_PERIOD, 16 - 1));
 751         /*
 752          * Data length is 16 bit (16 - 1).
 753          * Transmit MSB first.
 754          * Transmit 2 words each transfer.
 755          * Frame sync length is 16 bit (16 - 1).
 756          * Frame starts on negative pulse.
 757          */
 758         ssc_writel(chip->ssc->regs, TFMR,
 759                         SSC_BF(TFMR_DATLEN, 16 - 1)
 760                         | SSC_BIT(TFMR_MSBF)
 761                         | SSC_BF(TFMR_DATNB, 1)
 762                         | SSC_BF(TFMR_FSLEN, 16 - 1)
 763                         | SSC_BF(TFMR_FSOS, 1));
 764
 765         return 0;
 766 }
 767
 768 static int snd_at73c213_chip_init(struct snd_at73c213 *chip)
 769 {
 770         int retval;
 771         unsigned char dac_ctrl = 0;
 772
 773         retval = snd_at73c213_set_bitrate(chip);
 774         if (retval)
 775                 goto out;
 776
 777         /* Enable DAC master clock. */
 778         clk_enable(chip->board->dac_clk);
 779
 780         /* Initialize at73c213 on SPI bus. */
 781         retval = snd_at73c213_write_reg(chip, DAC_RST, 0x04);
 782         if (retval)
 783                 goto out_clk;
 784         msleep(1);
 785         retval = snd_at73c213_write_reg(chip, DAC_RST, 0x03);
 786         if (retval)
 787                 goto out_clk;
 788
 789         /* Precharge everything. */
 790         retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0xff);
 791         if (retval)
 792                 goto out_clk;
 793         retval = snd_at73c213_write_reg(chip, PA_CTRL, (1<<PA_CTRL_APAPRECH));
 794         if (retval)
 795                 goto out_clk;
 796         retval = snd_at73c213_write_reg(chip, DAC_CTRL,
 797                         (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR));
 798         if (retval)
 799                 goto out_clk;
 800
 801         msleep(50);
 802
 803         /* Stop precharging PA. */
 804         retval = snd_at73c213_write_reg(chip, PA_CTRL,
 805                         (1<<PA_CTRL_APALP) | 0x0f);
 806         if (retval)
 807                 goto out_clk;
 808
 809         msleep(450);
 810
 811         /* Stop precharging DAC, turn on master power. */
 812         retval = snd_at73c213_write_reg(chip, DAC_PRECH, (1<<DAC_PRECH_ONMSTR));
 813         if (retval)
 814                 goto out_clk;
 815
 816         msleep(1);
 817
 818         /* Turn on DAC. */
 819         dac_ctrl = (1<<DAC_CTRL_ONDACL) | (1<<DAC_CTRL_ONDACR)
 820                 | (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR);
 821
 822         retval = snd_at73c213_write_reg(chip, DAC_CTRL, dac_ctrl);
 823         if (retval)
 824                 goto out_clk;
 825
 826         /* Mute sound. */
 827         retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
 828         if (retval)
 829                 goto out_clk;
 830         retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
 831         if (retval)
 832                 goto out_clk;
 833         retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
 834         if (retval)
 835                 goto out_clk;
 836         retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
 837         if (retval)
 838                 goto out_clk;
 839         retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
 840         if (retval)
 841                 goto out_clk;
 842         retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
 843         if (retval)
 844                 goto out_clk;
 845         retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
 846         if (retval)
 847                 goto out_clk;
 848
 849         /* Enable I2S device, i.e. clock output. */
 850         ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));
 851
 852         goto out;
 853
 854 out_clk:
 855         clk_disable(chip->board->dac_clk);
 856 out:
 857         return retval;
 858 }
 859
 860 static int snd_at73c213_dev_free(struct snd_device *device)
 861 {
 862         struct snd_at73c213 *chip = device->device_data;
 863
 864         ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
 865         if (chip->irq >= 0) {
 866                 free_irq(chip->irq, chip);
 867                 chip->irq = -1;
 868         }
 869
 870         return 0;
 871 }
 872
 873 static int __devinit snd_at73c213_dev_init(struct snd_card *card,
 874                                          struct spi_device *spi)
 875 {
 876         static struct snd_device_ops ops = {
 877                 .dev_free       = snd_at73c213_dev_free,
 878         };
 879         struct snd_at73c213 *chip = get_chip(card);
 880         int irq, retval;
 881
 882         irq = chip->ssc->irq;
 883         if (irq < 0)
 884                 return irq;
 885
 886         spin_lock_init(&chip->lock);
 887         chip->card = card;
 888         chip->irq = -1;
 889
 890         retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip);
 891         if (retval) {
 892                 dev_dbg(&chip->spi->dev, "unable to request irq %d\n", irq);
 893                 goto out;
 894         }
 895         chip->irq = irq;
 896
 897         memcpy(&chip->reg_image, &snd_at73c213_original_image,
 898                         sizeof(snd_at73c213_original_image));
 899
 900         retval = snd_at73c213_ssc_init(chip);
 901         if (retval)
 902                 goto out_irq;
 903
 904         retval = snd_at73c213_chip_init(chip);
 905         if (retval)
 906                 goto out_irq;
 907
 908         retval = snd_at73c213_pcm_new(chip, 0);
 909         if (retval)
 910                 goto out_irq;
 911
 912         retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
 913         if (retval)
 914                 goto out_irq;
 915
 916         retval = snd_at73c213_mixer(chip);
 917         if (retval)
 918                 goto out_snd_dev;
 919
 920         snd_card_set_dev(card, &spi->dev);
 921
 922         goto out;
 923
 924 out_snd_dev:
 925         snd_device_free(card, chip);
 926 out_irq:
 927         free_irq(chip->irq, chip);
 928         chip->irq = -1;
 929 out:
 930         return retval;
 931 }
 932
 933 static int snd_at73c213_probe(struct spi_device *spi)
 934 {
 935         struct snd_card                 *card;
 936         struct snd_at73c213             *chip;
 937         struct at73c213_board_info      *board;
 938         int                             retval;
 939         char                            id[16];
 940
 941         board = spi->dev.platform_data;
 942         if (!board) {
 943                 dev_dbg(&spi->dev, "no platform_data\n");
 944                 return -ENXIO;
 945         }
 946
 947         if (!board->dac_clk) {
 948                 dev_dbg(&spi->dev, "no DAC clk\n");
 949                 return -ENXIO;
 950         }
 951
 952         if (IS_ERR(board->dac_clk)) {
 953                 dev_dbg(&spi->dev, "no DAC clk\n");
 954                 return PTR_ERR(board->dac_clk);
 955         }
 956
 957         retval = -ENOMEM;
 958
 959         /* Allocate "card" using some unused identifiers. */
 960         snprintf(id, sizeof id, "at73c213_%d", board->ssc_id);
 961         card = snd_card_new(-1, id, THIS_MODULE, sizeof(struct snd_at73c213));
 962         if (!card)
 963                 goto out;
 964
 965         chip = card->private_data;
 966         chip->spi = spi;
 967         chip->board = board;
 968
 969         chip->ssc = ssc_request(board->ssc_id);
 970         if (IS_ERR(chip->ssc)) {
 971                 dev_dbg(&spi->dev, "could not get ssc%d device\n",
 972                                 board->ssc_id);
 973                 retval = PTR_ERR(chip->ssc);
 974                 goto out_card;
 975         }
 976
 977         retval = snd_at73c213_dev_init(card, spi);
 978         if (retval)
 979                 goto out_ssc;
 980
 981         strcpy(card->driver, "at73c213");
 982         strcpy(card->shortname, board->shortname);
 983         sprintf(card->longname, "%s on irq %d", card->shortname, chip->irq);
 984
 985         retval = snd_card_register(card);
 986         if (retval)
 987                 goto out_ssc;
 988
 989         dev_set_drvdata(&spi->dev, card);
 990
 991         goto out;
 992
 993 out_ssc:
 994         ssc_free(chip->ssc);
 995 out_card:
 996         snd_card_free(card);
 997 out:
 998         return retval;
 999 }
1000
1001 static int __devexit snd_at73c213_remove(struct spi_device *spi)
1002 {
1003         struct snd_card *card = dev_get_drvdata(&spi->dev);
1004         struct snd_at73c213 *chip = card->private_data;
1005         int retval;
1006
1007         /* Stop playback. */
1008         ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
1009
1010         /* Mute sound. */
1011         retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
1012         if (retval)
1013                 goto out;
1014         retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
1015         if (retval)
1016                 goto out;
1017         retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
1018         if (retval)
1019                 goto out;
1020         retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
1021         if (retval)
1022                 goto out;
1023         retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
1024         if (retval)
1025                 goto out;
1026         retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
1027         if (retval)
1028                 goto out;
1029         retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
1030         if (retval)
1031                 goto out;
1032
1033         /* Turn off PA. */
1034         retval = snd_at73c213_write_reg(chip, PA_CTRL,
1035                                         chip->reg_image[PA_CTRL] | 0x0f);
1036         if (retval)
1037                 goto out;
1038         msleep(10);
1039         retval = snd_at73c213_write_reg(chip, PA_CTRL,
1040                                         (1 << PA_CTRL_APALP) | 0x0f);
1041         if (retval)
1042                 goto out;
1043
1044         /* Turn off external DAC. */
1045         retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x0c);
1046         if (retval)
1047                 goto out;
1048         msleep(2);
1049         retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x00);
1050         if (retval)
1051                 goto out;
1052
1053         /* Turn off master power. */
1054         retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0x00);
1055         if (retval)
1056                 goto out;
1057
1058 out:
1059         /* Stop DAC master clock. */
1060         clk_disable(chip->board->dac_clk);
1061
1062         ssc_free(chip->ssc);
1063         snd_card_free(card);
1064         dev_set_drvdata(&spi->dev, NULL);
1065
1066         return 0;
1067 }
1068
1069 #ifdef CONFIG_PM
1070 static int snd_at73c213_suspend(struct spi_device *spi, pm_message_t msg)
1071 {
1072         struct snd_card *card = dev_get_drvdata(&spi->dev);
1073         struct snd_at73c213 *chip = card->private_data;
1074
1075         ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
1076         clk_disable(chip->board->dac_clk);
1077
1078         return 0;
1079 }
1080
1081 static int snd_at73c213_resume(struct spi_device *spi)
1082 {
1083         struct snd_card *card = dev_get_drvdata(&spi->dev);
1084         struct snd_at73c213 *chip = card->private_data;
1085
1086         clk_enable(chip->board->dac_clk);
1087         ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));
1088
1089         return 0;
1090 }
1091 #else
1092 #define snd_at73c213_suspend NULL
1093 #define snd_at73c213_resume NULL
1094 #endif
1095
1096 static struct spi_driver at73c213_driver = {
1097         .driver         = {
1098                 .name   = "at73c213",
1099         },
1100         .probe          = snd_at73c213_probe,
1101         .suspend        = snd_at73c213_suspend,
1102         .resume         = snd_at73c213_resume,
1103         .remove         = __devexit_p(snd_at73c213_remove),
1104 };
1105
1106 static int __init at73c213_init(void)
1107 {
1108         return spi_register_driver(&at73c213_driver);
1109 }
1110 module_init(at73c213_init);
1111
1112 static void __exit at73c213_exit(void)
1113 {
1114         spi_unregister_driver(&at73c213_driver);
1115 }
1116 module_exit(at73c213_exit);
1117
1118 MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
1119 MODULE_DESCRIPTION("Sound driver for AT73C213 with Atmel SSC");
1120 MODULE_LICENSE("GPL");