sound/soc/codecs/cx20442.c

   1 /*
   2  * cx20442.c  --  CX20442 ALSA Soc Audio driver
   3  *
   4  * Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
   5  *
   6  * Initially based on sound/soc/codecs/wm8400.c
   7  * Copyright 2008, 2009 Wolfson Microelectronics PLC.
   8  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   9  *
  10  *  This program is free software; you can redistribute  it and/or modify it
  11  *  under  the terms of  the GNU General  Public License as published by the
  12  *  Free Software Foundation;  either version 2 of the  License, or (at your
  13  *  option) any later version.
  14  */
  15
  16 #include <linux/tty.h>
  17
  18 #include <sound/core.h>
  19 #include <sound/initval.h>
  20 #include <sound/soc-dapm.h>
  21
  22 #include "cx20442.h"
  23
  24
  25 struct cx20442_priv {
  26         struct snd_soc_codec codec;
  27         u8 reg_cache[1];
  28 };
  29
  30 #define CX20442_PM              0x0
  31
  32 #define CX20442_TELIN           0
  33 #define CX20442_TELOUT          1
  34 #define CX20442_MIC             2
  35 #define CX20442_SPKOUT          3
  36 #define CX20442_AGC             4
  37
  38 static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
  39         SND_SOC_DAPM_OUTPUT("TELOUT"),
  40         SND_SOC_DAPM_OUTPUT("SPKOUT"),
  41         SND_SOC_DAPM_OUTPUT("AGCOUT"),
  42
  43         SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
  44
  45         SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
  46         SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
  47         SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
  48
  49         SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
  50         SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
  51
  52         SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
  53
  54         SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
  55         SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
  56
  57         SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
  58
  59         SND_SOC_DAPM_INPUT("TELIN"),
  60         SND_SOC_DAPM_INPUT("MIC"),
  61         SND_SOC_DAPM_INPUT("AGCIN"),
  62 };
  63
  64 static const struct snd_soc_dapm_route cx20442_audio_map[] = {
  65         {"TELOUT", NULL, "TELOUT Amp"},
  66
  67         {"SPKOUT", NULL, "SPKOUT Mixer"},
  68         {"SPKOUT Mixer", NULL, "SPKOUT Amp"},
  69
  70         {"TELOUT Amp", NULL, "DAC"},
  71         {"SPKOUT Amp", NULL, "DAC"},
  72
  73         {"SPKOUT Mixer", NULL, "SPKOUT AGC"},
  74         {"SPKOUT AGC", NULL, "AGCIN"},
  75
  76         {"AGCOUT", NULL, "MIC AGC"},
  77         {"MIC AGC", NULL, "MIC"},
  78
  79         {"MIC Bias", NULL, "MIC"},
  80         {"Input Mixer", NULL, "MIC Bias"},
  81
  82         {"TELIN Bias", NULL, "TELIN"},
  83         {"Input Mixer", NULL, "TELIN Bias"},
  84
  85         {"ADC", NULL, "Input Mixer"},
  86 };
  87
  88 static int cx20442_add_widgets(struct snd_soc_codec *codec)
  89 {
  90         snd_soc_dapm_new_controls(codec, cx20442_dapm_widgets,
  91                                   ARRAY_SIZE(cx20442_dapm_widgets));
  92
  93         snd_soc_dapm_add_routes(codec, cx20442_audio_map,
  94                                 ARRAY_SIZE(cx20442_audio_map));
  95
  96         snd_soc_dapm_new_widgets(codec);
  97         return 0;
  98 }
  99
 100 static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
 101                                                         unsigned int reg)
 102 {
 103         u8 *reg_cache = codec->reg_cache;
 104
 105         if (reg >= codec->reg_cache_size)
 106                 return -EINVAL;
 107
 108         return reg_cache[reg];
 109 }
 110
 111 enum v253_vls {
 112         V253_VLS_NONE = 0,
 113         V253_VLS_T,
 114         V253_VLS_L,
 115         V253_VLS_LT,
 116         V253_VLS_S,
 117         V253_VLS_ST,
 118         V253_VLS_M,
 119         V253_VLS_MST,
 120         V253_VLS_S1,
 121         V253_VLS_S1T,
 122         V253_VLS_MS1T,
 123         V253_VLS_M1,
 124         V253_VLS_M1ST,
 125         V253_VLS_M1S1T,
 126         V253_VLS_H,
 127         V253_VLS_HT,
 128         V253_VLS_MS,
 129         V253_VLS_MS1,
 130         V253_VLS_M1S,
 131         V253_VLS_M1S1,
 132         V253_VLS_TEST,
 133 };
 134
 135 static int cx20442_pm_to_v253_vls(u8 value)
 136 {
 137         switch (value & ~(1 << CX20442_AGC)) {
 138         case 0:
 139                 return V253_VLS_T;
 140         case (1 << CX20442_SPKOUT):
 141                 return V253_VLS_S1;
 142         case (1 << CX20442_MIC):
 143                 return V253_VLS_M1;
 144         case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
 145                 return V253_VLS_M1S1;
 146         case (1 << CX20442_TELOUT):
 147         case (1 << CX20442_TELIN):
 148         case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
 149                 return V253_VLS_L;
 150         case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
 151                 return V253_VLS_NONE;
 152         }
 153         return -EINVAL;
 154 }
 155 static int cx20442_pm_to_v253_vsp(u8 value)
 156 {
 157         switch (value & ~(1 << CX20442_AGC)) {
 158         case (1 << CX20442_SPKOUT):
 159         case (1 << CX20442_MIC):
 160         case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
 161                 return (bool)(value & (1 << CX20442_AGC));
 162         }
 163         return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
 164 }
 165
 166 static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
 167                                                         unsigned int value)
 168 {
 169         u8 *reg_cache = codec->reg_cache;
 170         int vls, vsp, old, len;
 171         char buf[18];
 172
 173         if (reg >= codec->reg_cache_size)
 174                 return -EINVAL;
 175
 176         /* hw_write and control_data pointers required for talking to the modem
 177          * are expected to be set by the line discipline initialization code */
 178         if (!codec->hw_write || !codec->control_data)
 179                 return -EIO;
 180
 181         old = reg_cache[reg];
 182         reg_cache[reg] = value;
 183
 184         vls = cx20442_pm_to_v253_vls(value);
 185         if (vls < 0)
 186                 return vls;
 187
 188         vsp = cx20442_pm_to_v253_vsp(value);
 189         if (vsp < 0)
 190                 return vsp;
 191
 192         if ((vls == V253_VLS_T) ||
 193                         (vls == cx20442_pm_to_v253_vls(old))) {
 194                 if (vsp == cx20442_pm_to_v253_vsp(old))
 195                         return 0;
 196                 len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
 197         } else if (vsp == cx20442_pm_to_v253_vsp(old))
 198                 len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
 199         else
 200                 len = snprintf(buf, ARRAY_SIZE(buf),
 201                                         "at+vls=%d;+vsp=%d\r", vls, vsp);
 202
 203         if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
 204                 return -ENOMEM;
 205
 206         dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
 207         if (codec->hw_write(codec->control_data, buf, len) != len)
 208                 return -EIO;
 209
 210         return 0;
 211 }
 212
 213
 214 /* Moved up here as line discipline referres it during initialization */
 215 static struct snd_soc_codec *cx20442_codec;
 216
 217
 218 /*
 219  * Line discpline related code
 220  *
 221  * Any of the callback functions below can be used in two ways:
 222  * 1) registerd by a machine driver as one of line discipline operations,
 223  * 2) called from a machine's provided line discipline callback function
 224  *    in case when extra machine specific code must be run as well.
 225  */
 226
 227 /* Modem init: echo off, digital speaker off, quiet off, voice mode */
 228 static const char *v253_init = "ate0m0q0+fclass=8\r";
 229
 230 /* Line discipline .open() */
 231 static int v253_open(struct tty_struct *tty)
 232 {
 233         struct snd_soc_codec *codec = cx20442_codec;
 234         int ret, len = strlen(v253_init);
 235
 236         /* Doesn't make sense without write callback */
 237         if (!tty->ops->write)
 238                 return -EINVAL;
 239
 240         /* Pass the codec structure address for use by other ldisc callbacks */
 241         tty->disc_data = codec;
 242
 243         if (tty->ops->write(tty, v253_init, len) != len) {
 244                 ret = -EIO;
 245                 goto err;
 246         }
 247         /* Actual setup will be performed after the modem responds. */
 248         return 0;
 249 err:
 250         tty->disc_data = NULL;
 251         return ret;
 252 }
 253
 254 /* Line discipline .close() */
 255 static void v253_close(struct tty_struct *tty)
 256 {
 257         struct snd_soc_codec *codec = tty->disc_data;
 258
 259         tty->disc_data = NULL;
 260
 261         if (!codec)
 262                 return;
 263
 264         /* Prevent the codec driver from further accessing the modem */
 265         codec->hw_write = NULL;
 266         codec->control_data = NULL;
 267         codec->pop_time = 0;
 268 }
 269
 270 /* Line discipline .hangup() */
 271 static int v253_hangup(struct tty_struct *tty)
 272 {
 273         v253_close(tty);
 274         return 0;
 275 }
 276
 277 /* Line discipline .receive_buf() */
 278 static void v253_receive(struct tty_struct *tty,
 279                                 const unsigned char *cp, char *fp, int count)
 280 {
 281         struct snd_soc_codec *codec = tty->disc_data;
 282
 283         if (!codec)
 284                 return;
 285
 286         if (!codec->control_data) {
 287                 /* First modem response, complete setup procedure */
 288
 289                 /* Set up codec driver access to modem controls */
 290                 codec->control_data = tty;
 291                 codec->hw_write = (hw_write_t)tty->ops->write;
 292                 codec->pop_time = 1;
 293         }
 294 }
 295
 296 /* Line discipline .write_wakeup() */
 297 static void v253_wakeup(struct tty_struct *tty)
 298 {
 299 }
 300
 301 struct tty_ldisc_ops v253_ops = {
 302         .magic = TTY_LDISC_MAGIC,
 303         .name = "cx20442",
 304         .owner = THIS_MODULE,
 305         .open = v253_open,
 306         .close = v253_close,
 307         .hangup = v253_hangup,
 308         .receive_buf = v253_receive,
 309         .write_wakeup = v253_wakeup,
 310 };
 311 EXPORT_SYMBOL_GPL(v253_ops);
 312
 313
 314 /*
 315  * Codec DAI
 316  */
 317
 318 struct snd_soc_dai cx20442_dai = {
 319         .name = "CX20442",
 320         .playback = {
 321                 .stream_name = "Playback",
 322                 .channels_min = 1,
 323                 .channels_max = 1,
 324                 .rates = SNDRV_PCM_RATE_8000,
 325                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 326         },
 327         .capture = {
 328                 .stream_name = "Capture",
 329                 .channels_min = 1,
 330                 .channels_max = 1,
 331                 .rates = SNDRV_PCM_RATE_8000,
 332                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 333         },
 334 };
 335 EXPORT_SYMBOL_GPL(cx20442_dai);
 336
 337 static int cx20442_codec_probe(struct platform_device *pdev)
 338 {
 339         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 340         struct snd_soc_codec *codec;
 341         int ret;
 342
 343         if (!cx20442_codec) {
 344                 dev_err(&pdev->dev, "cx20442 not yet discovered\n");
 345                 return -ENODEV;
 346         }
 347         codec = cx20442_codec;
 348
 349         socdev->card->codec = codec;
 350
 351         /* register pcms */
 352         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 353         if (ret < 0) {
 354                 dev_err(&pdev->dev, "failed to create pcms\n");
 355                 goto pcm_err;
 356         }
 357
 358         cx20442_add_widgets(codec);
 359
 360         ret = snd_soc_init_card(socdev);
 361         if (ret < 0) {
 362                 dev_err(&pdev->dev, "failed to register card\n");
 363                 goto card_err;
 364         }
 365
 366         return ret;
 367
 368 card_err:
 369         snd_soc_free_pcms(socdev);
 370         snd_soc_dapm_free(socdev);
 371 pcm_err:
 372         return ret;
 373 }
 374
 375 /* power down chip */
 376 static int cx20442_codec_remove(struct platform_device *pdev)
 377 {
 378         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 379
 380         snd_soc_free_pcms(socdev);
 381         snd_soc_dapm_free(socdev);
 382
 383         return 0;
 384 }
 385
 386 struct snd_soc_codec_device cx20442_codec_dev = {
 387         .probe =        cx20442_codec_probe,
 388         .remove =       cx20442_codec_remove,
 389 };
 390 EXPORT_SYMBOL_GPL(cx20442_codec_dev);
 391
 392 static int cx20442_register(struct cx20442_priv *cx20442)
 393 {
 394         struct snd_soc_codec *codec = &cx20442->codec;
 395         int ret;
 396
 397         mutex_init(&codec->mutex);
 398         INIT_LIST_HEAD(&codec->dapm_widgets);
 399         INIT_LIST_HEAD(&codec->dapm_paths);
 400
 401         codec->name = "CX20442";
 402         codec->owner = THIS_MODULE;
 403         codec->private_data = cx20442;
 404
 405         codec->dai = &cx20442_dai;
 406         codec->num_dai = 1;
 407
 408         codec->reg_cache = &cx20442->reg_cache;
 409         codec->reg_cache_size = ARRAY_SIZE(cx20442->reg_cache);
 410         codec->read = cx20442_read_reg_cache;
 411         codec->write = cx20442_write;
 412
 413         codec->bias_level = SND_SOC_BIAS_OFF;
 414
 415         cx20442_dai.dev = codec->dev;
 416
 417         cx20442_codec = codec;
 418
 419         ret = snd_soc_register_codec(codec);
 420         if (ret != 0) {
 421                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 422                 goto err;
 423         }
 424
 425         ret = snd_soc_register_dai(&cx20442_dai);
 426         if (ret != 0) {
 427                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 428                 goto err_codec;
 429         }
 430
 431         return 0;
 432
 433 err_codec:
 434         snd_soc_unregister_codec(codec);
 435 err:
 436         cx20442_codec = NULL;
 437         kfree(cx20442);
 438         return ret;
 439 }
 440
 441 static void cx20442_unregister(struct cx20442_priv *cx20442)
 442 {
 443         snd_soc_unregister_dai(&cx20442_dai);
 444         snd_soc_unregister_codec(&cx20442->codec);
 445
 446         cx20442_codec = NULL;
 447         kfree(cx20442);
 448 }
 449
 450 static int cx20442_platform_probe(struct platform_device *pdev)
 451 {
 452         struct cx20442_priv *cx20442;
 453         struct snd_soc_codec *codec;
 454
 455         cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
 456         if (cx20442 == NULL)
 457                 return -ENOMEM;
 458
 459         codec = &cx20442->codec;
 460
 461         codec->control_data = NULL;
 462         codec->hw_write = NULL;
 463         codec->pop_time = 0;
 464
 465         codec->dev = &pdev->dev;
 466         platform_set_drvdata(pdev, cx20442);
 467
 468         return cx20442_register(cx20442);
 469 }
 470
 471 static int __exit cx20442_platform_remove(struct platform_device *pdev)
 472 {
 473         struct cx20442_priv *cx20442 = platform_get_drvdata(pdev);
 474
 475         cx20442_unregister(cx20442);
 476         return 0;
 477 }
 478
 479 static struct platform_driver cx20442_platform_driver = {
 480         .driver = {
 481                 .name = "cx20442",
 482                 .owner = THIS_MODULE,
 483                 },
 484         .probe = cx20442_platform_probe,
 485         .remove = __exit_p(cx20442_platform_remove),
 486 };
 487
 488 static int __init cx20442_init(void)
 489 {
 490         return platform_driver_register(&cx20442_platform_driver);
 491 }
 492 module_init(cx20442_init);
 493
 494 static void __exit cx20442_exit(void)
 495 {
 496         platform_driver_unregister(&cx20442_platform_driver);
 497 }
 498 module_exit(cx20442_exit);
 499
 500 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
 501 MODULE_AUTHOR("Janusz Krzysztofik");
 502 MODULE_LICENSE("GPL");
 503 MODULE_ALIAS("platform:cx20442");