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.h>
  22
  23 #include "cx20442.h"
  24
  25
  26 struct cx20442_priv {
  27         enum snd_soc_control_type control_type;
  28         void *control_data;
  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 unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
  90                                                         unsigned int reg)
  91 {
  92         u8 *reg_cache = codec->reg_cache;
  93
  94         if (reg >= codec->driver->reg_cache_size)
  95                 return -EINVAL;
  96
  97         return reg_cache[reg];
  98 }
  99
 100 enum v253_vls {
 101         V253_VLS_NONE = 0,
 102         V253_VLS_T,
 103         V253_VLS_L,
 104         V253_VLS_LT,
 105         V253_VLS_S,
 106         V253_VLS_ST,
 107         V253_VLS_M,
 108         V253_VLS_MST,
 109         V253_VLS_S1,
 110         V253_VLS_S1T,
 111         V253_VLS_MS1T,
 112         V253_VLS_M1,
 113         V253_VLS_M1ST,
 114         V253_VLS_M1S1T,
 115         V253_VLS_H,
 116         V253_VLS_HT,
 117         V253_VLS_MS,
 118         V253_VLS_MS1,
 119         V253_VLS_M1S,
 120         V253_VLS_M1S1,
 121         V253_VLS_TEST,
 122 };
 123
 124 static int cx20442_pm_to_v253_vls(u8 value)
 125 {
 126         switch (value & ~(1 << CX20442_AGC)) {
 127         case 0:
 128                 return V253_VLS_T;
 129         case (1 << CX20442_SPKOUT):
 130         case (1 << CX20442_MIC):
 131         case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
 132                 return V253_VLS_M1S1;
 133         case (1 << CX20442_TELOUT):
 134         case (1 << CX20442_TELIN):
 135         case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
 136                 return V253_VLS_L;
 137         case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
 138                 return V253_VLS_NONE;
 139         }
 140         return -EINVAL;
 141 }
 142 static int cx20442_pm_to_v253_vsp(u8 value)
 143 {
 144         switch (value & ~(1 << CX20442_AGC)) {
 145         case (1 << CX20442_SPKOUT):
 146         case (1 << CX20442_MIC):
 147         case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
 148                 return (bool)(value & (1 << CX20442_AGC));
 149         }
 150         return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
 151 }
 152
 153 static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
 154                                                         unsigned int value)
 155 {
 156         struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
 157         u8 *reg_cache = codec->reg_cache;
 158         int vls, vsp, old, len;
 159         char buf[18];
 160
 161         if (reg >= codec->driver->reg_cache_size)
 162                 return -EINVAL;
 163
 164         /* hw_write and control_data pointers required for talking to the modem
 165          * are expected to be set by the line discipline initialization code */
 166         if (!codec->hw_write || !cx20442->control_data)
 167                 return -EIO;
 168
 169         old = reg_cache[reg];
 170         reg_cache[reg] = value;
 171
 172         vls = cx20442_pm_to_v253_vls(value);
 173         if (vls < 0)
 174                 return vls;
 175
 176         vsp = cx20442_pm_to_v253_vsp(value);
 177         if (vsp < 0)
 178                 return vsp;
 179
 180         if ((vls == V253_VLS_T) ||
 181                         (vls == cx20442_pm_to_v253_vls(old))) {
 182                 if (vsp == cx20442_pm_to_v253_vsp(old))
 183                         return 0;
 184                 len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
 185         } else if (vsp == cx20442_pm_to_v253_vsp(old))
 186                 len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
 187         else
 188                 len = snprintf(buf, ARRAY_SIZE(buf),
 189                                         "at+vls=%d;+vsp=%d\r", vls, vsp);
 190
 191         if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
 192                 return -ENOMEM;
 193
 194         dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
 195         if (codec->hw_write(cx20442->control_data, buf, len) != len)
 196                 return -EIO;
 197
 198         return 0;
 199 }
 200
 201
 202 /*
 203  * Line discpline related code
 204  *
 205  * Any of the callback functions below can be used in two ways:
 206  * 1) registerd by a machine driver as one of line discipline operations,
 207  * 2) called from a machine's provided line discipline callback function
 208  *    in case when extra machine specific code must be run as well.
 209  */
 210
 211 /* Modem init: echo off, digital speaker off, quiet off, voice mode */
 212 static const char *v253_init = "ate0m0q0+fclass=8\r";
 213
 214 /* Line discipline .open() */
 215 static int v253_open(struct tty_struct *tty)
 216 {
 217         int ret, len = strlen(v253_init);
 218
 219         /* Doesn't make sense without write callback */
 220         if (!tty->ops->write)
 221                 return -EINVAL;
 222
 223         /* Won't work if no codec pointer has been passed by a card driver */
 224         if (!tty->disc_data)
 225                 return -ENODEV;
 226
 227         if (tty->ops->write(tty, v253_init, len) != len) {
 228                 ret = -EIO;
 229                 goto err;
 230         }
 231         /* Actual setup will be performed after the modem responds. */
 232         return 0;
 233 err:
 234         tty->disc_data = NULL;
 235         return ret;
 236 }
 237
 238 /* Line discipline .close() */
 239 static void v253_close(struct tty_struct *tty)
 240 {
 241         struct snd_soc_codec *codec = tty->disc_data;
 242         struct cx20442_priv *cx20442;
 243
 244         tty->disc_data = NULL;
 245
 246         if (!codec)
 247                 return;
 248
 249         cx20442 = snd_soc_codec_get_drvdata(codec);
 250
 251         /* Prevent the codec driver from further accessing the modem */
 252         codec->hw_write = NULL;
 253         cx20442->control_data = NULL;
 254         codec->card->pop_time = 0;
 255 }
 256
 257 /* Line discipline .hangup() */
 258 static int v253_hangup(struct tty_struct *tty)
 259 {
 260         v253_close(tty);
 261         return 0;
 262 }
 263
 264 /* Line discipline .receive_buf() */
 265 static void v253_receive(struct tty_struct *tty,
 266                                 const unsigned char *cp, char *fp, int count)
 267 {
 268         struct snd_soc_codec *codec = tty->disc_data;
 269         struct cx20442_priv *cx20442;
 270
 271         if (!codec)
 272                 return;
 273
 274         cx20442 = snd_soc_codec_get_drvdata(codec);
 275
 276         if (!cx20442->control_data) {
 277                 /* First modem response, complete setup procedure */
 278
 279                 /* Set up codec driver access to modem controls */
 280                 cx20442->control_data = tty;
 281                 codec->hw_write = (hw_write_t)tty->ops->write;
 282                 codec->card->pop_time = 1;
 283         }
 284 }
 285
 286 /* Line discipline .write_wakeup() */
 287 static void v253_wakeup(struct tty_struct *tty)
 288 {
 289 }
 290
 291 struct tty_ldisc_ops v253_ops = {
 292         .magic = TTY_LDISC_MAGIC,
 293         .name = "cx20442",
 294         .owner = THIS_MODULE,
 295         .open = v253_open,
 296         .close = v253_close,
 297         .hangup = v253_hangup,
 298         .receive_buf = v253_receive,
 299         .write_wakeup = v253_wakeup,
 300 };
 301 EXPORT_SYMBOL_GPL(v253_ops);
 302
 303
 304 /*
 305  * Codec DAI
 306  */
 307
 308 static struct snd_soc_dai_driver cx20442_dai = {
 309         .name = "cx20442-voice",
 310         .playback = {
 311                 .stream_name = "Playback",
 312                 .channels_min = 1,
 313                 .channels_max = 1,
 314                 .rates = SNDRV_PCM_RATE_8000,
 315                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 316         },
 317         .capture = {
 318                 .stream_name = "Capture",
 319                 .channels_min = 1,
 320                 .channels_max = 1,
 321                 .rates = SNDRV_PCM_RATE_8000,
 322                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 323         },
 324 };
 325
 326 static int cx20442_codec_probe(struct snd_soc_codec *codec)
 327 {
 328         struct cx20442_priv *cx20442;
 329
 330         cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
 331         if (cx20442 == NULL)
 332                 return -ENOMEM;
 333         snd_soc_codec_set_drvdata(codec, cx20442);
 334
 335         cx20442->control_data = NULL;
 336         codec->hw_write = NULL;
 337         codec->card->pop_time = 0;
 338
 339         return 0;
 340 }
 341
 342 /* power down chip */
 343 static int cx20442_codec_remove(struct snd_soc_codec *codec)
 344 {
 345         struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
 346
 347         if (cx20442->control_data) {
 348                         struct tty_struct *tty = cx20442->control_data;
 349                         tty_hangup(tty);
 350         }
 351
 352         kfree(cx20442);
 353         return 0;
 354 }
 355
 356 static const u8 cx20442_reg;
 357
 358 static struct snd_soc_codec_driver cx20442_codec_dev = {
 359         .probe =        cx20442_codec_probe,
 360         .remove =       cx20442_codec_remove,
 361         .reg_cache_default = &cx20442_reg,
 362         .reg_cache_size = 1,
 363         .reg_word_size = sizeof(u8),
 364         .read = cx20442_read_reg_cache,
 365         .write = cx20442_write,
 366         .dapm_widgets = cx20442_dapm_widgets,
 367         .num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets),
 368         .dapm_routes = cx20442_audio_map,
 369         .num_dapm_routes = ARRAY_SIZE(cx20442_audio_map),
 370 };
 371
 372 static int cx20442_platform_probe(struct platform_device *pdev)
 373 {
 374         return snd_soc_register_codec(&pdev->dev,
 375                         &cx20442_codec_dev, &cx20442_dai, 1);
 376 }
 377
 378 static int __exit cx20442_platform_remove(struct platform_device *pdev)
 379 {
 380         snd_soc_unregister_codec(&pdev->dev);
 381         return 0;
 382 }
 383
 384 static struct platform_driver cx20442_platform_driver = {
 385         .driver = {
 386                 .name = "cx20442-codec",
 387                 .owner = THIS_MODULE,
 388                 },
 389         .probe = cx20442_platform_probe,
 390         .remove = __exit_p(cx20442_platform_remove),
 391 };
 392
 393 static int __init cx20442_init(void)
 394 {
 395         return platform_driver_register(&cx20442_platform_driver);
 396 }
 397 module_init(cx20442_init);
 398
 399 static void __exit cx20442_exit(void)
 400 {
 401         platform_driver_unregister(&cx20442_platform_driver);
 402 }
 403 module_exit(cx20442_exit);
 404
 405 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
 406 MODULE_AUTHOR("Janusz Krzysztofik");
 407 MODULE_LICENSE("GPL");
 408 MODULE_ALIAS("platform:cx20442-codec");