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         u8 reg_cache[1];
  30 };
  31
  32 #define CX20442_PM              0x0
  33
  34 #define CX20442_TELIN           0
  35 #define CX20442_TELOUT          1
  36 #define CX20442_MIC             2
  37 #define CX20442_SPKOUT          3
  38 #define CX20442_AGC             4
  39
  40 static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
  41         SND_SOC_DAPM_OUTPUT("TELOUT"),
  42         SND_SOC_DAPM_OUTPUT("SPKOUT"),
  43         SND_SOC_DAPM_OUTPUT("AGCOUT"),
  44
  45         SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
  46
  47         SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
  48         SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
  49         SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
  50
  51         SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
  52         SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
  53
  54         SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
  55
  56         SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
  57         SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
  58
  59         SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
  60
  61         SND_SOC_DAPM_INPUT("TELIN"),
  62         SND_SOC_DAPM_INPUT("MIC"),
  63         SND_SOC_DAPM_INPUT("AGCIN"),
  64 };
  65
  66 static const struct snd_soc_dapm_route cx20442_audio_map[] = {
  67         {"TELOUT", NULL, "TELOUT Amp"},
  68
  69         {"SPKOUT", NULL, "SPKOUT Mixer"},
  70         {"SPKOUT Mixer", NULL, "SPKOUT Amp"},
  71
  72         {"TELOUT Amp", NULL, "DAC"},
  73         {"SPKOUT Amp", NULL, "DAC"},
  74
  75         {"SPKOUT Mixer", NULL, "SPKOUT AGC"},
  76         {"SPKOUT AGC", NULL, "AGCIN"},
  77
  78         {"AGCOUT", NULL, "MIC AGC"},
  79         {"MIC AGC", NULL, "MIC"},
  80
  81         {"MIC Bias", NULL, "MIC"},
  82         {"Input Mixer", NULL, "MIC Bias"},
  83
  84         {"TELIN Bias", NULL, "TELIN"},
  85         {"Input Mixer", NULL, "TELIN Bias"},
  86
  87         {"ADC", NULL, "Input Mixer"},
  88 };
  89
  90 static int cx20442_add_widgets(struct snd_soc_codec *codec)
  91 {
  92         struct snd_soc_dapm_context *dapm = &codec->dapm;
  93
  94         snd_soc_dapm_new_controls(dapm, cx20442_dapm_widgets,
  95                                   ARRAY_SIZE(cx20442_dapm_widgets));
  96         snd_soc_dapm_add_routes(dapm, cx20442_audio_map,
  97                                 ARRAY_SIZE(cx20442_audio_map));
  98
  99         return 0;
 100 }
 101
 102 static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
 103                                                         unsigned int reg)
 104 {
 105         u8 *reg_cache = codec->reg_cache;
 106
 107         if (reg >= codec->driver->reg_cache_size)
 108                 return -EINVAL;
 109
 110         return reg_cache[reg];
 111 }
 112
 113 enum v253_vls {
 114         V253_VLS_NONE = 0,
 115         V253_VLS_T,
 116         V253_VLS_L,
 117         V253_VLS_LT,
 118         V253_VLS_S,
 119         V253_VLS_ST,
 120         V253_VLS_M,
 121         V253_VLS_MST,
 122         V253_VLS_S1,
 123         V253_VLS_S1T,
 124         V253_VLS_MS1T,
 125         V253_VLS_M1,
 126         V253_VLS_M1ST,
 127         V253_VLS_M1S1T,
 128         V253_VLS_H,
 129         V253_VLS_HT,
 130         V253_VLS_MS,
 131         V253_VLS_MS1,
 132         V253_VLS_M1S,
 133         V253_VLS_M1S1,
 134         V253_VLS_TEST,
 135 };
 136
 137 static int cx20442_pm_to_v253_vls(u8 value)
 138 {
 139         switch (value & ~(1 << CX20442_AGC)) {
 140         case 0:
 141                 return V253_VLS_T;
 142         case (1 << CX20442_SPKOUT):
 143         case (1 << CX20442_MIC):
 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         struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
 170         u8 *reg_cache = codec->reg_cache;
 171         int vls, vsp, old, len;
 172         char buf[18];
 173
 174         if (reg >= codec->driver->reg_cache_size)
 175                 return -EINVAL;
 176
 177         /* hw_write and control_data pointers required for talking to the modem
 178          * are expected to be set by the line discipline initialization code */
 179         if (!codec->hw_write || !cx20442->control_data)
 180                 return -EIO;
 181
 182         old = reg_cache[reg];
 183         reg_cache[reg] = value;
 184
 185         vls = cx20442_pm_to_v253_vls(value);
 186         if (vls < 0)
 187                 return vls;
 188
 189         vsp = cx20442_pm_to_v253_vsp(value);
 190         if (vsp < 0)
 191                 return vsp;
 192
 193         if ((vls == V253_VLS_T) ||
 194                         (vls == cx20442_pm_to_v253_vls(old))) {
 195                 if (vsp == cx20442_pm_to_v253_vsp(old))
 196                         return 0;
 197                 len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
 198         } else if (vsp == cx20442_pm_to_v253_vsp(old))
 199                 len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
 200         else
 201                 len = snprintf(buf, ARRAY_SIZE(buf),
 202                                         "at+vls=%d;+vsp=%d\r", vls, vsp);
 203
 204         if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
 205                 return -ENOMEM;
 206
 207         dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
 208         if (codec->hw_write(cx20442->control_data, buf, len) != len)
 209                 return -EIO;
 210
 211         return 0;
 212 }
 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         int ret, len = strlen(v253_init);
 231
 232         /* Doesn't make sense without write callback */
 233         if (!tty->ops->write)
 234                 return -EINVAL;
 235
 236         /* Won't work if no codec pointer has been passed by a card driver */
 237         if (!tty->disc_data)
 238                 return -ENODEV;
 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         struct cx20442_priv *cx20442;
 256
 257         tty->disc_data = NULL;
 258
 259         if (!codec)
 260                 return;
 261
 262         cx20442 = snd_soc_codec_get_drvdata(codec);
 263
 264         /* Prevent the codec driver from further accessing the modem */
 265         codec->hw_write = NULL;
 266         cx20442->control_data = NULL;
 267         codec->dapm.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         struct cx20442_priv *cx20442;
 283
 284         if (!codec)
 285                 return;
 286
 287         cx20442 = snd_soc_codec_get_drvdata(codec);
 288
 289         if (!cx20442->control_data) {
 290                 /* First modem response, complete setup procedure */
 291
 292                 /* Set up codec driver access to modem controls */
 293                 cx20442->control_data = tty;
 294                 codec->hw_write = (hw_write_t)tty->ops->write;
 295                 codec->dapm.pop_time = 1;
 296         }
 297 }
 298
 299 /* Line discipline .write_wakeup() */
 300 static void v253_wakeup(struct tty_struct *tty)
 301 {
 302 }
 303
 304 struct tty_ldisc_ops v253_ops = {
 305         .magic = TTY_LDISC_MAGIC,
 306         .name = "cx20442",
 307         .owner = THIS_MODULE,
 308         .open = v253_open,
 309         .close = v253_close,
 310         .hangup = v253_hangup,
 311         .receive_buf = v253_receive,
 312         .write_wakeup = v253_wakeup,
 313 };
 314 EXPORT_SYMBOL_GPL(v253_ops);
 315
 316
 317 /*
 318  * Codec DAI
 319  */
 320
 321 static struct snd_soc_dai_driver cx20442_dai = {
 322         .name = "cx20442-voice",
 323         .playback = {
 324                 .stream_name = "Playback",
 325                 .channels_min = 1,
 326                 .channels_max = 1,
 327                 .rates = SNDRV_PCM_RATE_8000,
 328                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 329         },
 330         .capture = {
 331                 .stream_name = "Capture",
 332                 .channels_min = 1,
 333                 .channels_max = 1,
 334                 .rates = SNDRV_PCM_RATE_8000,
 335                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 336         },
 337 };
 338
 339 static int cx20442_codec_probe(struct snd_soc_codec *codec)
 340 {
 341         struct cx20442_priv *cx20442;
 342
 343         cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
 344         if (cx20442 == NULL)
 345                 return -ENOMEM;
 346         snd_soc_codec_set_drvdata(codec, cx20442);
 347
 348         cx20442_add_widgets(codec);
 349
 350         cx20442->control_data = NULL;
 351         codec->hw_write = NULL;
 352         codec->dapm.pop_time = 0;
 353
 354         return 0;
 355 }
 356
 357 /* power down chip */
 358 static int cx20442_codec_remove(struct snd_soc_codec *codec)
 359 {
 360         struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
 361
 362         if (cx20442->control_data) {
 363                         struct tty_struct *tty = cx20442->control_data;
 364                         tty_hangup(tty);
 365         }
 366
 367         kfree(cx20442);
 368         return 0;
 369 }
 370
 371 static struct snd_soc_codec_driver cx20442_codec_dev = {
 372         .probe =        cx20442_codec_probe,
 373         .remove =       cx20442_codec_remove,
 374         .reg_cache_size = 1,
 375         .reg_word_size = sizeof(u8),
 376         .read = cx20442_read_reg_cache,
 377         .write = cx20442_write,
 378 };
 379
 380 static int cx20442_platform_probe(struct platform_device *pdev)
 381 {
 382         return snd_soc_register_codec(&pdev->dev,
 383                         &cx20442_codec_dev, &cx20442_dai, 1);
 384 }
 385
 386 static int __exit cx20442_platform_remove(struct platform_device *pdev)
 387 {
 388         snd_soc_unregister_codec(&pdev->dev);
 389         return 0;
 390 }
 391
 392 static struct platform_driver cx20442_platform_driver = {
 393         .driver = {
 394                 .name = "cx20442-codec",
 395                 .owner = THIS_MODULE,
 396                 },
 397         .probe = cx20442_platform_probe,
 398         .remove = __exit_p(cx20442_platform_remove),
 399 };
 400
 401 static int __init cx20442_init(void)
 402 {
 403         return platform_driver_register(&cx20442_platform_driver);
 404 }
 405 module_init(cx20442_init);
 406
 407 static void __exit cx20442_exit(void)
 408 {
 409         platform_driver_unregister(&cx20442_platform_driver);
 410 }
 411 module_exit(cx20442_exit);
 412
 413 MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
 414 MODULE_AUTHOR("Janusz Krzysztofik");
 415 MODULE_LICENSE("GPL");
 416 MODULE_ALIAS("platform:cx20442-codec");