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 int cx20442_add_widgets(struct snd_soc_codec *codec)
  90 {
  91         struct snd_soc_dapm_context *dapm = &codec->dapm;
  92
  93         snd_soc_dapm_new_controls(dapm, cx20442_dapm_widgets,
  94                                   ARRAY_SIZE(cx20442_dapm_widgets));
  95         snd_soc_dapm_add_routes(dapm, cx20442_audio_map,
  96                                 ARRAY_SIZE(cx20442_audio_map));
  97
  98         return 0;
  99 }
 100
 101 static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
 102                                                         unsigned int reg)
 103 {
 104         u8 *reg_cache = codec->reg_cache;
 105
 106         if (reg >= codec->driver->reg_cache_size)
 107                 return -EINVAL;
 108
 109         return reg_cache[reg];
 110 }
 111
 112 enum v253_vls {
 113         V253_VLS_NONE = 0,
 114         V253_VLS_T,
 115         V253_VLS_L,
 116         V253_VLS_LT,
 117         V253_VLS_S,
 118         V253_VLS_ST,
 119         V253_VLS_M,
 120         V253_VLS_MST,
 121         V253_VLS_S1,
 122         V253_VLS_S1T,
 123         V253_VLS_MS1T,
 124         V253_VLS_M1,
 125         V253_VLS_M1ST,
 126         V253_VLS_M1S1T,
 127         V253_VLS_H,
 128         V253_VLS_HT,
 129         V253_VLS_MS,
 130         V253_VLS_MS1,
 131         V253_VLS_M1S,
 132         V253_VLS_M1S1,
 133         V253_VLS_TEST,
 134 };
 135
 136 static int cx20442_pm_to_v253_vls(u8 value)
 137 {
 138         switch (value & ~(1 << CX20442_AGC)) {
 139         case 0:
 140                 return V253_VLS_T;
 141         case (1 << CX20442_SPKOUT):
 142         case (1 << CX20442_MIC):
 143         case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
 144                 return V253_VLS_M1S1;
 145         case (1 << CX20442_TELOUT):
 146         case (1 << CX20442_TELIN):
 147         case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
 148                 return V253_VLS_L;
 149         case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
 150                 return V253_VLS_NONE;
 151         }
 152         return -EINVAL;
 153 }
 154 static int cx20442_pm_to_v253_vsp(u8 value)
 155 {
 156         switch (value & ~(1 << CX20442_AGC)) {
 157         case (1 << CX20442_SPKOUT):
 158         case (1 << CX20442_MIC):
 159         case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
 160                 return (bool)(value & (1 << CX20442_AGC));
 161         }
 162         return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
 163 }
 164
 165 static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
 166                                                         unsigned int value)
 167 {
 168         struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
 169         u8 *reg_cache = codec->reg_cache;
 170         int vls, vsp, old, len;
 171         char buf[18];
 172
 173         if (reg >= codec->driver->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 || !cx20442->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(cx20442->control_data, buf, len) != len)
 208                 return -EIO;
 209
 210         return 0;
 211 }
 212
 213
 214 /*
 215  * Line discpline related code
 216  *
 217  * Any of the callback functions below can be used in two ways:
 218  * 1) registerd by a machine driver as one of line discipline operations,
 219  * 2) called from a machine's provided line discipline callback function
 220  *    in case when extra machine specific code must be run as well.
 221  */
 222
 223 /* Modem init: echo off, digital speaker off, quiet off, voice mode */
 224 static const char *v253_init = "ate0m0q0+fclass=8\r";
 225
 226 /* Line discipline .open() */
 227 static int v253_open(struct tty_struct *tty)
 228 {
 229         int ret, len = strlen(v253_init);
 230
 231         /* Doesn't make sense without write callback */
 232         if (!tty->ops->write)
 233                 return -EINVAL;
 234
 235         /* Won't work if no codec pointer has been passed by a card driver */
 236         if (!tty->disc_data)
 237                 return -ENODEV;
 238
 239         if (tty->ops->write(tty, v253_init, len) != len) {
 240                 ret = -EIO;
 241                 goto err;
 242         }
 243         /* Actual setup will be performed after the modem responds. */
 244         return 0;
 245 err:
 246         tty->disc_data = NULL;
 247         return ret;
 248 }
 249
 250 /* Line discipline .close() */
 251 static void v253_close(struct tty_struct *tty)
 252 {
 253         struct snd_soc_codec *codec = tty->disc_data;
 254         struct cx20442_priv *cx20442;
 255
 256         tty->disc_data = NULL;
 257
 258         if (!codec)
 259                 return;
 260
 261         cx20442 = snd_soc_codec_get_drvdata(codec);
 262
 263         /* Prevent the codec driver from further accessing the modem */
 264         codec->hw_write = NULL;
 265         cx20442->control_data = NULL;
 266         codec->card->pop_time = 0;
 267 }
 268
 269 /* Line discipline .hangup() */
 270 static int v253_hangup(struct tty_struct *tty)
 271 {
 272         v253_close(tty);
 273         return 0;
 274 }
 275
 276 /* Line discipline .receive_buf() */
 277 static void v253_receive(struct tty_struct *tty,
 278                                 const unsigned char *cp, char *fp, int count)
 279 {
 280         struct snd_soc_codec *codec = tty->disc_data;
 281         struct cx20442_priv *cx20442;
 282
 283         if (!codec)
 284                 return;
 285
 286         cx20442 = snd_soc_codec_get_drvdata(codec);
 287
 288         if (!cx20442->control_data) {
 289                 /* First modem response, complete setup procedure */
 290
 291                 /* Set up codec driver access to modem controls */
 292                 cx20442->control_data = tty;
 293                 codec->hw_write = (hw_write_t)tty->ops->write;
 294                 codec->card->pop_time = 1;
 295         }
 296 }
 297
 298 /* Line discipline .write_wakeup() */
 299 static void v253_wakeup(struct tty_struct *tty)
 300 {
 301 }
 302
 303 struct tty_ldisc_ops v253_ops = {
 304         .magic = TTY_LDISC_MAGIC,
 305         .name = "cx20442",
 306         .owner = THIS_MODULE,
 307         .open = v253_open,
 308         .close = v253_close,
 309         .hangup = v253_hangup,
 310         .receive_buf = v253_receive,
 311         .write_wakeup = v253_wakeup,
 312 };
 313 EXPORT_SYMBOL_GPL(v253_ops);
 314
 315
 316 /*
 317  * Codec DAI
 318  */
 319
 320 static struct snd_soc_dai_driver cx20442_dai = {
 321         .name = "cx20442-voice",
 322         .playback = {
 323                 .stream_name = "Playback",
 324                 .channels_min = 1,
 325                 .channels_max = 1,
 326                 .rates = SNDRV_PCM_RATE_8000,
 327                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 328         },
 329         .capture = {
 330                 .stream_name = "Capture",
 331                 .channels_min = 1,
 332                 .channels_max = 1,
 333                 .rates = SNDRV_PCM_RATE_8000,
 334                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 335         },
 336 };
 337
 338 static int cx20442_codec_probe(struct snd_soc_codec *codec)
 339 {
 340         struct cx20442_priv *cx20442;
 341
 342         cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
 343         if (cx20442 == NULL)
 344                 return -ENOMEM;
 345         snd_soc_codec_set_drvdata(codec, cx20442);
 346
 347         cx20442_add_widgets(codec);
 348
 349         cx20442->control_data = NULL;
 350         codec->hw_write = NULL;
 351         codec->card->pop_time = 0;
 352
 353         return 0;
 354 }
 355
 356 /* power down chip */
 357 static int cx20442_codec_remove(struct snd_soc_codec *codec)
 358 {
 359         struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
 360
 361         if (cx20442->control_data) {
 362                         struct tty_struct *tty = cx20442->control_data;
 363                         tty_hangup(tty);
 364         }
 365
 366         kfree(cx20442);
 367         return 0;
 368 }
 369
 370 static const u8 cx20442_reg;
 371
 372 static struct snd_soc_codec_driver cx20442_codec_dev = {
 373         .probe =        cx20442_codec_probe,
 374         .remove =       cx20442_codec_remove,
 375         .reg_cache_default = &cx20442_reg,
 376         .reg_cache_size = 1,
 377         .reg_word_size = sizeof(u8),
 378         .read = cx20442_read_reg_cache,
 379         .write = cx20442_write,
 380 };
 381
 382 static int cx20442_platform_probe(struct platform_device *pdev)
 383 {
 384         return snd_soc_register_codec(&pdev->dev,
 385                         &cx20442_codec_dev, &cx20442_dai, 1);
 386 }
 387
 388 static int __exit cx20442_platform_remove(struct platform_device *pdev)
 389 {
 390         snd_soc_unregister_codec(&pdev->dev);
 391         return 0;
 392 }
 393
 394 static struct platform_driver cx20442_platform_driver = {
 395         .driver = {
 396                 .name = "cx20442-codec",
 397                 .owner = THIS_MODULE,
 398                 },
 399         .probe = cx20442_platform_probe,
 400         .remove = __exit_p(cx20442_platform_remove),
 401 };
 402
 403 static int __init cx20442_init(void)
 404 {
 405         return platform_driver_register(&cx20442_platform_driver);
 406 }
 407 module_init(cx20442_init);
 408
 409 static void __exit cx20442_exit(void)
 410 {
 411         platform_driver_unregister(&cx20442_platform_driver);
 412 }
 413 module_exit(cx20442_exit);
 414
 415 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
 416 MODULE_AUTHOR("Janusz Krzysztofik");
 417 MODULE_LICENSE("GPL");
 418 MODULE_ALIAS("platform:cx20442-codec");