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