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         return 0;
  97 }
  98
  99 static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
 100                                                         unsigned int reg)
 101 {
 102         u8 *reg_cache = codec->reg_cache;
 103
 104         if (reg >= codec->reg_cache_size)
 105                 return -EINVAL;
 106
 107         return reg_cache[reg];
 108 }
 109
 110 enum v253_vls {
 111         V253_VLS_NONE = 0,
 112         V253_VLS_T,
 113         V253_VLS_L,
 114         V253_VLS_LT,
 115         V253_VLS_S,
 116         V253_VLS_ST,
 117         V253_VLS_M,
 118         V253_VLS_MST,
 119         V253_VLS_S1,
 120         V253_VLS_S1T,
 121         V253_VLS_MS1T,
 122         V253_VLS_M1,
 123         V253_VLS_M1ST,
 124         V253_VLS_M1S1T,
 125         V253_VLS_H,
 126         V253_VLS_HT,
 127         V253_VLS_MS,
 128         V253_VLS_MS1,
 129         V253_VLS_M1S,
 130         V253_VLS_M1S1,
 131         V253_VLS_TEST,
 132 };
 133
 134 static int cx20442_pm_to_v253_vls(u8 value)
 135 {
 136         switch (value & ~(1 << CX20442_AGC)) {
 137         case 0:
 138                 return V253_VLS_T;
 139         case (1 << CX20442_SPKOUT):
 140         case (1 << CX20442_MIC):
 141         case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
 142                 return V253_VLS_M1S1;
 143         case (1 << CX20442_TELOUT):
 144         case (1 << CX20442_TELIN):
 145         case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
 146                 return V253_VLS_L;
 147         case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
 148                 return V253_VLS_NONE;
 149         }
 150         return -EINVAL;
 151 }
 152 static int cx20442_pm_to_v253_vsp(u8 value)
 153 {
 154         switch (value & ~(1 << CX20442_AGC)) {
 155         case (1 << CX20442_SPKOUT):
 156         case (1 << CX20442_MIC):
 157         case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
 158                 return (bool)(value & (1 << CX20442_AGC));
 159         }
 160         return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
 161 }
 162
 163 static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
 164                                                         unsigned int value)
 165 {
 166         u8 *reg_cache = codec->reg_cache;
 167         int vls, vsp, old, len;
 168         char buf[18];
 169
 170         if (reg >= codec->reg_cache_size)
 171                 return -EINVAL;
 172
 173         /* hw_write and control_data pointers required for talking to the modem
 174          * are expected to be set by the line discipline initialization code */
 175         if (!codec->hw_write || !codec->control_data)
 176                 return -EIO;
 177
 178         old = reg_cache[reg];
 179         reg_cache[reg] = value;
 180
 181         vls = cx20442_pm_to_v253_vls(value);
 182         if (vls < 0)
 183                 return vls;
 184
 185         vsp = cx20442_pm_to_v253_vsp(value);
 186         if (vsp < 0)
 187                 return vsp;
 188
 189         if ((vls == V253_VLS_T) ||
 190                         (vls == cx20442_pm_to_v253_vls(old))) {
 191                 if (vsp == cx20442_pm_to_v253_vsp(old))
 192                         return 0;
 193                 len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
 194         } else if (vsp == cx20442_pm_to_v253_vsp(old))
 195                 len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
 196         else
 197                 len = snprintf(buf, ARRAY_SIZE(buf),
 198                                         "at+vls=%d;+vsp=%d\r", vls, vsp);
 199
 200         if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
 201                 return -ENOMEM;
 202
 203         dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
 204         if (codec->hw_write(codec->control_data, buf, len) != len)
 205                 return -EIO;
 206
 207         return 0;
 208 }
 209
 210
 211 /* Moved up here as line discipline referres it during initialization */
 212 static struct snd_soc_codec *cx20442_codec;
 213
 214
 215 /*
 216  * Line discpline related code
 217  *
 218  * Any of the callback functions below can be used in two ways:
 219  * 1) registerd by a machine driver as one of line discipline operations,
 220  * 2) called from a machine's provided line discipline callback function
 221  *    in case when extra machine specific code must be run as well.
 222  */
 223
 224 /* Modem init: echo off, digital speaker off, quiet off, voice mode */
 225 static const char *v253_init = "ate0m0q0+fclass=8\r";
 226
 227 /* Line discipline .open() */
 228 static int v253_open(struct tty_struct *tty)
 229 {
 230         struct snd_soc_codec *codec = cx20442_codec;
 231         int ret, len = strlen(v253_init);
 232
 233         /* Doesn't make sense without write callback */
 234         if (!tty->ops->write)
 235                 return -EINVAL;
 236
 237         /* Pass the codec structure address for use by other ldisc callbacks */
 238         tty->disc_data = codec;
 239
 240         if (tty->ops->write(tty, v253_init, len) != len) {
 241                 ret = -EIO;
 242                 goto err;
 243         }
 244         /* Actual setup will be performed after the modem responds. */
 245         return 0;
 246 err:
 247         tty->disc_data = NULL;
 248         return ret;
 249 }
 250
 251 /* Line discipline .close() */
 252 static void v253_close(struct tty_struct *tty)
 253 {
 254         struct snd_soc_codec *codec = tty->disc_data;
 255
 256         tty->disc_data = NULL;
 257
 258         if (!codec)
 259                 return;
 260
 261         /* Prevent the codec driver from further accessing the modem */
 262         codec->hw_write = NULL;
 263         codec->control_data = NULL;
 264         codec->pop_time = 0;
 265 }
 266
 267 /* Line discipline .hangup() */
 268 static int v253_hangup(struct tty_struct *tty)
 269 {
 270         v253_close(tty);
 271         return 0;
 272 }
 273
 274 /* Line discipline .receive_buf() */
 275 static void v253_receive(struct tty_struct *tty,
 276                                 const unsigned char *cp, char *fp, int count)
 277 {
 278         struct snd_soc_codec *codec = tty->disc_data;
 279
 280         if (!codec)
 281                 return;
 282
 283         if (!codec->control_data) {
 284                 /* First modem response, complete setup procedure */
 285
 286                 /* Set up codec driver access to modem controls */
 287                 codec->control_data = tty;
 288                 codec->hw_write = (hw_write_t)tty->ops->write;
 289                 codec->pop_time = 1;
 290         }
 291 }
 292
 293 /* Line discipline .write_wakeup() */
 294 static void v253_wakeup(struct tty_struct *tty)
 295 {
 296 }
 297
 298 struct tty_ldisc_ops v253_ops = {
 299         .magic = TTY_LDISC_MAGIC,
 300         .name = "cx20442",
 301         .owner = THIS_MODULE,
 302         .open = v253_open,
 303         .close = v253_close,
 304         .hangup = v253_hangup,
 305         .receive_buf = v253_receive,
 306         .write_wakeup = v253_wakeup,
 307 };
 308 EXPORT_SYMBOL_GPL(v253_ops);
 309
 310
 311 /*
 312  * Codec DAI
 313  */
 314
 315 struct snd_soc_dai cx20442_dai = {
 316         .name = "CX20442",
 317         .playback = {
 318                 .stream_name = "Playback",
 319                 .channels_min = 1,
 320                 .channels_max = 1,
 321                 .rates = SNDRV_PCM_RATE_8000,
 322                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 323         },
 324         .capture = {
 325                 .stream_name = "Capture",
 326                 .channels_min = 1,
 327                 .channels_max = 1,
 328                 .rates = SNDRV_PCM_RATE_8000,
 329                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 330         },
 331 };
 332 EXPORT_SYMBOL_GPL(cx20442_dai);
 333
 334 static int cx20442_codec_probe(struct platform_device *pdev)
 335 {
 336         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 337         struct snd_soc_codec *codec;
 338         int ret;
 339
 340         if (!cx20442_codec) {
 341                 dev_err(&pdev->dev, "cx20442 not yet discovered\n");
 342                 return -ENODEV;
 343         }
 344         codec = cx20442_codec;
 345
 346         socdev->card->codec = codec;
 347
 348         /* register pcms */
 349         ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 350         if (ret < 0) {
 351                 dev_err(&pdev->dev, "failed to create pcms\n");
 352                 goto pcm_err;
 353         }
 354
 355         cx20442_add_widgets(codec);
 356
 357 pcm_err:
 358         return ret;
 359 }
 360
 361 /* power down chip */
 362 static int cx20442_codec_remove(struct platform_device *pdev)
 363 {
 364         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 365
 366         snd_soc_free_pcms(socdev);
 367         snd_soc_dapm_free(socdev);
 368
 369         return 0;
 370 }
 371
 372 struct snd_soc_codec_device cx20442_codec_dev = {
 373         .probe =        cx20442_codec_probe,
 374         .remove =       cx20442_codec_remove,
 375 };
 376 EXPORT_SYMBOL_GPL(cx20442_codec_dev);
 377
 378 static int cx20442_register(struct cx20442_priv *cx20442)
 379 {
 380         struct snd_soc_codec *codec = &cx20442->codec;
 381         int ret;
 382
 383         mutex_init(&codec->mutex);
 384         INIT_LIST_HEAD(&codec->dapm_widgets);
 385         INIT_LIST_HEAD(&codec->dapm_paths);
 386
 387         codec->name = "CX20442";
 388         codec->owner = THIS_MODULE;
 389         codec->private_data = cx20442;
 390
 391         codec->dai = &cx20442_dai;
 392         codec->num_dai = 1;
 393
 394         codec->reg_cache = &cx20442->reg_cache;
 395         codec->reg_cache_size = ARRAY_SIZE(cx20442->reg_cache);
 396         codec->read = cx20442_read_reg_cache;
 397         codec->write = cx20442_write;
 398
 399         codec->bias_level = SND_SOC_BIAS_OFF;
 400
 401         cx20442_dai.dev = codec->dev;
 402
 403         cx20442_codec = codec;
 404
 405         ret = snd_soc_register_codec(codec);
 406         if (ret != 0) {
 407                 dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 408                 goto err;
 409         }
 410
 411         ret = snd_soc_register_dai(&cx20442_dai);
 412         if (ret != 0) {
 413                 dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
 414                 goto err_codec;
 415         }
 416
 417         return 0;
 418
 419 err_codec:
 420         snd_soc_unregister_codec(codec);
 421 err:
 422         cx20442_codec = NULL;
 423         kfree(cx20442);
 424         return ret;
 425 }
 426
 427 static void cx20442_unregister(struct cx20442_priv *cx20442)
 428 {
 429         snd_soc_unregister_dai(&cx20442_dai);
 430         snd_soc_unregister_codec(&cx20442->codec);
 431
 432         cx20442_codec = NULL;
 433         kfree(cx20442);
 434 }
 435
 436 static int cx20442_platform_probe(struct platform_device *pdev)
 437 {
 438         struct cx20442_priv *cx20442;
 439         struct snd_soc_codec *codec;
 440
 441         cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
 442         if (cx20442 == NULL)
 443                 return -ENOMEM;
 444
 445         codec = &cx20442->codec;
 446
 447         codec->control_data = NULL;
 448         codec->hw_write = NULL;
 449         codec->pop_time = 0;
 450
 451         codec->dev = &pdev->dev;
 452         platform_set_drvdata(pdev, cx20442);
 453
 454         return cx20442_register(cx20442);
 455 }
 456
 457 static int __exit cx20442_platform_remove(struct platform_device *pdev)
 458 {
 459         struct cx20442_priv *cx20442 = platform_get_drvdata(pdev);
 460
 461         cx20442_unregister(cx20442);
 462         return 0;
 463 }
 464
 465 static struct platform_driver cx20442_platform_driver = {
 466         .driver = {
 467                 .name = "cx20442",
 468                 .owner = THIS_MODULE,
 469                 },
 470         .probe = cx20442_platform_probe,
 471         .remove = __exit_p(cx20442_platform_remove),
 472 };
 473
 474 static int __init cx20442_init(void)
 475 {
 476         return platform_driver_register(&cx20442_platform_driver);
 477 }
 478 module_init(cx20442_init);
 479
 480 static void __exit cx20442_exit(void)
 481 {
 482         platform_driver_unregister(&cx20442_platform_driver);
 483 }
 484 module_exit(cx20442_exit);
 485
 486 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
 487 MODULE_AUTHOR("Janusz Krzysztofik");
 488 MODULE_LICENSE("GPL");
 489 MODULE_ALIAS("platform:cx20442");