sound/soc/omap/ams-delta.c

   1 /*
   2  * ams-delta.c  --  SoC audio for Amstrad E3 (Delta) videophone
   3  *
   4  * Copyright (C) 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
   5  *
   6  * Initially based on sound/soc/omap/osk5912.x
   7  * Copyright (C) 2008 Mistral Solutions
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  21  * 02110-1301 USA
  22  *
  23  */
  24
  25 #include <linux/gpio.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/tty.h>
  28
  29 #include <sound/soc.h>
  30 #include <sound/jack.h>
  31
  32 #include <asm/mach-types.h>
  33
  34 #include <plat/board-ams-delta.h>
  35 #include <plat/mcbsp.h>
  36
  37 #include "omap-mcbsp.h"
  38 #include "omap-pcm.h"
  39 #include "../codecs/cx20442.h"
  40
  41
  42 /* Board specific DAPM widgets */
  43 static const struct snd_soc_dapm_widget ams_delta_dapm_widgets[] = {
  44         /* Handset */
  45         SND_SOC_DAPM_MIC("Mouthpiece", NULL),
  46         SND_SOC_DAPM_HP("Earpiece", NULL),
  47         /* Handsfree/Speakerphone */
  48         SND_SOC_DAPM_MIC("Microphone", NULL),
  49         SND_SOC_DAPM_SPK("Speaker", NULL),
  50 };
  51
  52 /* How they are connected to codec pins */
  53 static const struct snd_soc_dapm_route ams_delta_audio_map[] = {
  54         {"TELIN", NULL, "Mouthpiece"},
  55         {"Earpiece", NULL, "TELOUT"},
  56
  57         {"MIC", NULL, "Microphone"},
  58         {"Speaker", NULL, "SPKOUT"},
  59 };
  60
  61 /*
  62  * Controls, functional after the modem line discipline is activated.
  63  */
  64
  65 /* Virtual switch: audio input/output constellations */
  66 static const char *ams_delta_audio_mode[] =
  67         {"Mixed", "Handset", "Handsfree", "Speakerphone"};
  68
  69 /* Selection <-> pin translation */
  70 #define AMS_DELTA_MOUTHPIECE    0
  71 #define AMS_DELTA_EARPIECE      1
  72 #define AMS_DELTA_MICROPHONE    2
  73 #define AMS_DELTA_SPEAKER       3
  74 #define AMS_DELTA_AGC           4
  75
  76 #define AMS_DELTA_MIXED         ((1 << AMS_DELTA_EARPIECE) | \
  77                                                 (1 << AMS_DELTA_MICROPHONE))
  78 #define AMS_DELTA_HANDSET       ((1 << AMS_DELTA_MOUTHPIECE) | \
  79                                                 (1 << AMS_DELTA_EARPIECE))
  80 #define AMS_DELTA_HANDSFREE     ((1 << AMS_DELTA_MICROPHONE) | \
  81                                                 (1 << AMS_DELTA_SPEAKER))
  82 #define AMS_DELTA_SPEAKERPHONE  (AMS_DELTA_HANDSFREE | (1 << AMS_DELTA_AGC))
  83
  84 static const unsigned short ams_delta_audio_mode_pins[] = {
  85         AMS_DELTA_MIXED,
  86         AMS_DELTA_HANDSET,
  87         AMS_DELTA_HANDSFREE,
  88         AMS_DELTA_SPEAKERPHONE,
  89 };
  90
  91 static unsigned short ams_delta_audio_agc;
  92
  93 static int ams_delta_set_audio_mode(struct snd_kcontrol *kcontrol,
  94                                         struct snd_ctl_elem_value *ucontrol)
  95 {
  96         struct snd_soc_codec *codec =  snd_kcontrol_chip(kcontrol);
  97         struct snd_soc_dapm_context *dapm = &codec->dapm;
  98         struct soc_enum *control = (struct soc_enum *)kcontrol->private_value;
  99         unsigned short pins;
 100         int pin, changed = 0;
 101
 102         /* Refuse any mode changes if we are not able to control the codec. */
 103         if (!codec->hw_write)
 104                 return -EUNATCH;
 105
 106         if (ucontrol->value.enumerated.item[0] >= control->max)
 107                 return -EINVAL;
 108
 109         mutex_lock(&codec->mutex);
 110
 111         /* Translate selection to bitmap */
 112         pins = ams_delta_audio_mode_pins[ucontrol->value.enumerated.item[0]];
 113
 114         /* Setup pins after corresponding bits if changed */
 115         pin = !!(pins & (1 << AMS_DELTA_MOUTHPIECE));
 116         if (pin != snd_soc_dapm_get_pin_status(dapm, "Mouthpiece")) {
 117                 changed = 1;
 118                 if (pin)
 119                         snd_soc_dapm_enable_pin(dapm, "Mouthpiece");
 120                 else
 121                         snd_soc_dapm_disable_pin(dapm, "Mouthpiece");
 122         }
 123         pin = !!(pins & (1 << AMS_DELTA_EARPIECE));
 124         if (pin != snd_soc_dapm_get_pin_status(dapm, "Earpiece")) {
 125                 changed = 1;
 126                 if (pin)
 127                         snd_soc_dapm_enable_pin(dapm, "Earpiece");
 128                 else
 129                         snd_soc_dapm_disable_pin(dapm, "Earpiece");
 130         }
 131         pin = !!(pins & (1 << AMS_DELTA_MICROPHONE));
 132         if (pin != snd_soc_dapm_get_pin_status(dapm, "Microphone")) {
 133                 changed = 1;
 134                 if (pin)
 135                         snd_soc_dapm_enable_pin(dapm, "Microphone");
 136                 else
 137                         snd_soc_dapm_disable_pin(dapm, "Microphone");
 138         }
 139         pin = !!(pins & (1 << AMS_DELTA_SPEAKER));
 140         if (pin != snd_soc_dapm_get_pin_status(dapm, "Speaker")) {
 141                 changed = 1;
 142                 if (pin)
 143                         snd_soc_dapm_enable_pin(dapm, "Speaker");
 144                 else
 145                         snd_soc_dapm_disable_pin(dapm, "Speaker");
 146         }
 147         pin = !!(pins & (1 << AMS_DELTA_AGC));
 148         if (pin != ams_delta_audio_agc) {
 149                 ams_delta_audio_agc = pin;
 150                 changed = 1;
 151                 if (pin)
 152                         snd_soc_dapm_enable_pin(dapm, "AGCIN");
 153                 else
 154                         snd_soc_dapm_disable_pin(dapm, "AGCIN");
 155         }
 156         if (changed)
 157                 snd_soc_dapm_sync(dapm);
 158
 159         mutex_unlock(&codec->mutex);
 160
 161         return changed;
 162 }
 163
 164 static int ams_delta_get_audio_mode(struct snd_kcontrol *kcontrol,
 165                                         struct snd_ctl_elem_value *ucontrol)
 166 {
 167         struct snd_soc_codec *codec =  snd_kcontrol_chip(kcontrol);
 168         struct snd_soc_dapm_context *dapm = &codec->dapm;
 169         unsigned short pins, mode;
 170
 171         pins = ((snd_soc_dapm_get_pin_status(dapm, "Mouthpiece") <<
 172                                                         AMS_DELTA_MOUTHPIECE) |
 173                         (snd_soc_dapm_get_pin_status(dapm, "Earpiece") <<
 174                                                         AMS_DELTA_EARPIECE));
 175         if (pins)
 176                 pins |= (snd_soc_dapm_get_pin_status(dapm, "Microphone") <<
 177                                                         AMS_DELTA_MICROPHONE);
 178         else
 179                 pins = ((snd_soc_dapm_get_pin_status(dapm, "Microphone") <<
 180                                                         AMS_DELTA_MICROPHONE) |
 181                         (snd_soc_dapm_get_pin_status(dapm, "Speaker") <<
 182                                                         AMS_DELTA_SPEAKER) |
 183                         (ams_delta_audio_agc << AMS_DELTA_AGC));
 184
 185         for (mode = 0; mode < ARRAY_SIZE(ams_delta_audio_mode); mode++)
 186                 if (pins == ams_delta_audio_mode_pins[mode])
 187                         break;
 188
 189         if (mode >= ARRAY_SIZE(ams_delta_audio_mode))
 190                 return -EINVAL;
 191
 192         ucontrol->value.enumerated.item[0] = mode;
 193
 194         return 0;
 195 }
 196
 197 static const struct soc_enum ams_delta_audio_enum[] = {
 198         SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(ams_delta_audio_mode),
 199                                                 ams_delta_audio_mode),
 200 };
 201
 202 static const struct snd_kcontrol_new ams_delta_audio_controls[] = {
 203         SOC_ENUM_EXT("Audio Mode", ams_delta_audio_enum[0],
 204                         ams_delta_get_audio_mode, ams_delta_set_audio_mode),
 205 };
 206
 207 /* Hook switch */
 208 static struct snd_soc_jack ams_delta_hook_switch;
 209 static struct snd_soc_jack_gpio ams_delta_hook_switch_gpios[] = {
 210         {
 211                 .gpio = 4,
 212                 .name = "hook_switch",
 213                 .report = SND_JACK_HEADSET,
 214                 .invert = 1,
 215                 .debounce_time = 150,
 216         }
 217 };
 218
 219 /* After we are able to control the codec over the modem,
 220  * the hook switch can be used for dynamic DAPM reconfiguration. */
 221 static struct snd_soc_jack_pin ams_delta_hook_switch_pins[] = {
 222         /* Handset */
 223         {
 224                 .pin = "Mouthpiece",
 225                 .mask = SND_JACK_MICROPHONE,
 226         },
 227         {
 228                 .pin = "Earpiece",
 229                 .mask = SND_JACK_HEADPHONE,
 230         },
 231         /* Handsfree */
 232         {
 233                 .pin = "Microphone",
 234                 .mask = SND_JACK_MICROPHONE,
 235                 .invert = 1,
 236         },
 237         {
 238                 .pin = "Speaker",
 239                 .mask = SND_JACK_HEADPHONE,
 240                 .invert = 1,
 241         },
 242 };
 243
 244
 245 /*
 246  * Modem line discipline, required for making above controls functional.
 247  * Activated from userspace with ldattach, possibly invoked from udev rule.
 248  */
 249
 250 /* To actually apply any modem controlled configuration changes to the codec,
 251  * we must connect codec DAI pins to the modem for a moment.  Be carefull not
 252  * to interfere with our digital mute function that shares the same hardware. */
 253 static struct timer_list cx81801_timer;
 254 static bool cx81801_cmd_pending;
 255 static bool ams_delta_muted;
 256 static DEFINE_SPINLOCK(ams_delta_lock);
 257
 258 static void cx81801_timeout(unsigned long data)
 259 {
 260         int muted;
 261
 262         spin_lock(&ams_delta_lock);
 263         cx81801_cmd_pending = 0;
 264         muted = ams_delta_muted;
 265         spin_unlock(&ams_delta_lock);
 266
 267         /* Reconnect the codec DAI back from the modem to the CPU DAI
 268          * only if digital mute still off */
 269         if (!muted)
 270                 ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_CODEC, 0);
 271 }
 272
 273 /*
 274  * Used for passing a codec structure pointer
 275  * from the board initialization code to the tty line discipline.
 276  */
 277 static struct snd_soc_codec *cx20442_codec;
 278
 279 /* Line discipline .open() */
 280 static int cx81801_open(struct tty_struct *tty)
 281 {
 282         int ret;
 283
 284         if (!cx20442_codec)
 285                 return -ENODEV;
 286
 287         /*
 288          * Pass the codec structure pointer for use by other ldisc callbacks,
 289          * both the card and the codec specific parts.
 290          */
 291         tty->disc_data = cx20442_codec;
 292
 293         ret = v253_ops.open(tty);
 294
 295         if (ret < 0)
 296                 tty->disc_data = NULL;
 297
 298         return ret;
 299 }
 300
 301 /* Line discipline .close() */
 302 static void cx81801_close(struct tty_struct *tty)
 303 {
 304         struct snd_soc_codec *codec = tty->disc_data;
 305         struct snd_soc_dapm_context *dapm = &codec->dapm;
 306
 307         del_timer_sync(&cx81801_timer);
 308
 309         /* Prevent the hook switch from further changing the DAPM pins */
 310         INIT_LIST_HEAD(&ams_delta_hook_switch.pins);
 311
 312         if (!codec)
 313                 return;
 314
 315         v253_ops.close(tty);
 316
 317         /* Revert back to default audio input/output constellation */
 318         snd_soc_dapm_disable_pin(dapm, "Mouthpiece");
 319         snd_soc_dapm_enable_pin(dapm, "Earpiece");
 320         snd_soc_dapm_enable_pin(dapm, "Microphone");
 321         snd_soc_dapm_disable_pin(dapm, "Speaker");
 322         snd_soc_dapm_disable_pin(dapm, "AGCIN");
 323         snd_soc_dapm_sync(dapm);
 324 }
 325
 326 /* Line discipline .hangup() */
 327 static int cx81801_hangup(struct tty_struct *tty)
 328 {
 329         cx81801_close(tty);
 330         return 0;
 331 }
 332
 333 /* Line discipline .recieve_buf() */
 334 static void cx81801_receive(struct tty_struct *tty,
 335                                 const unsigned char *cp, char *fp, int count)
 336 {
 337         struct snd_soc_codec *codec = tty->disc_data;
 338         const unsigned char *c;
 339         int apply, ret;
 340
 341         if (!codec)
 342                 return;
 343
 344         if (!codec->hw_write) {
 345                 /* First modem response, complete setup procedure */
 346
 347                 /* Initialize timer used for config pulse generation */
 348                 setup_timer(&cx81801_timer, cx81801_timeout, 0);
 349
 350                 v253_ops.receive_buf(tty, cp, fp, count);
 351
 352                 /* Link hook switch to DAPM pins */
 353                 ret = snd_soc_jack_add_pins(&ams_delta_hook_switch,
 354                                         ARRAY_SIZE(ams_delta_hook_switch_pins),
 355                                         ams_delta_hook_switch_pins);
 356                 if (ret)
 357                         dev_warn(codec->dev,
 358                                 "Failed to link hook switch to DAPM pins, "
 359                                 "will continue with hook switch unlinked.\n");
 360
 361                 return;
 362         }
 363
 364         v253_ops.receive_buf(tty, cp, fp, count);
 365
 366         for (c = &cp[count - 1]; c >= cp; c--) {
 367                 if (*c != '\r')
 368                         continue;
 369                 /* Complete modem response received, apply config to codec */
 370
 371                 spin_lock_bh(&ams_delta_lock);
 372                 mod_timer(&cx81801_timer, jiffies + msecs_to_jiffies(150));
 373                 apply = !ams_delta_muted && !cx81801_cmd_pending;
 374                 cx81801_cmd_pending = 1;
 375                 spin_unlock_bh(&ams_delta_lock);
 376
 377                 /* Apply config pulse by connecting the codec to the modem
 378                  * if not already done */
 379                 if (apply)
 380                         ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_CODEC,
 381                                                 AMS_DELTA_LATCH2_MODEM_CODEC);
 382                 break;
 383         }
 384 }
 385
 386 /* Line discipline .write_wakeup() */
 387 static void cx81801_wakeup(struct tty_struct *tty)
 388 {
 389         v253_ops.write_wakeup(tty);
 390 }
 391
 392 static struct tty_ldisc_ops cx81801_ops = {
 393         .magic = TTY_LDISC_MAGIC,
 394         .name = "cx81801",
 395         .owner = THIS_MODULE,
 396         .open = cx81801_open,
 397         .close = cx81801_close,
 398         .hangup = cx81801_hangup,
 399         .receive_buf = cx81801_receive,
 400         .write_wakeup = cx81801_wakeup,
 401 };
 402
 403
 404 /*
 405  * Even if not very usefull, the sound card can still work without any of the
 406  * above functonality activated.  You can still control its audio input/output
 407  * constellation and speakerphone gain from userspace by issueing AT commands
 408  * over the modem port.
 409  */
 410
 411 static int ams_delta_hw_params(struct snd_pcm_substream *substream,
 412                          struct snd_pcm_hw_params *params)
 413 {
 414         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 415
 416         /* Set cpu DAI configuration */
 417         return snd_soc_dai_set_fmt(rtd->cpu_dai,
 418                                    SND_SOC_DAIFMT_DSP_A |
 419                                    SND_SOC_DAIFMT_NB_NF |
 420                                    SND_SOC_DAIFMT_CBM_CFM);
 421 }
 422
 423 static struct snd_soc_ops ams_delta_ops = {
 424         .hw_params = ams_delta_hw_params,
 425 };
 426
 427
 428 /* Board specific codec bias level control */
 429 static int ams_delta_set_bias_level(struct snd_soc_card *card,
 430                                         enum snd_soc_bias_level level)
 431 {
 432         struct snd_soc_codec *codec = card->rtd->codec;
 433
 434         switch (level) {
 435         case SND_SOC_BIAS_ON:
 436         case SND_SOC_BIAS_PREPARE:
 437         case SND_SOC_BIAS_STANDBY:
 438                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF)
 439                         ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_NRESET,
 440                                                 AMS_DELTA_LATCH2_MODEM_NRESET);
 441                 break;
 442         case SND_SOC_BIAS_OFF:
 443                 if (codec->dapm.bias_level != SND_SOC_BIAS_OFF)
 444                         ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_NRESET,
 445                                                 0);
 446         }
 447         codec->dapm.bias_level = level;
 448
 449         return 0;
 450 }
 451
 452 /* Digital mute implemented using modem/CPU multiplexer.
 453  * Shares hardware with codec config pulse generation */
 454 static bool ams_delta_muted = 1;
 455
 456 static int ams_delta_digital_mute(struct snd_soc_dai *dai, int mute)
 457 {
 458         int apply;
 459
 460         if (ams_delta_muted == mute)
 461                 return 0;
 462
 463         spin_lock_bh(&ams_delta_lock);
 464         ams_delta_muted = mute;
 465         apply = !cx81801_cmd_pending;
 466         spin_unlock_bh(&ams_delta_lock);
 467
 468         if (apply)
 469                 ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_CODEC,
 470                                 mute ? AMS_DELTA_LATCH2_MODEM_CODEC : 0);
 471         return 0;
 472 }
 473
 474 /* Our codec DAI probably doesn't have its own .ops structure */
 475 static struct snd_soc_dai_ops ams_delta_dai_ops = {
 476         .digital_mute = ams_delta_digital_mute,
 477 };
 478
 479 /* Will be used if the codec ever has its own digital_mute function */
 480 static int ams_delta_startup(struct snd_pcm_substream *substream)
 481 {
 482         return ams_delta_digital_mute(NULL, 0);
 483 }
 484
 485 static void ams_delta_shutdown(struct snd_pcm_substream *substream)
 486 {
 487         ams_delta_digital_mute(NULL, 1);
 488 }
 489
 490
 491 /*
 492  * Card initialization
 493  */
 494
 495 static int ams_delta_cx20442_init(struct snd_soc_pcm_runtime *rtd)
 496 {
 497         struct snd_soc_codec *codec = rtd->codec;
 498         struct snd_soc_dapm_context *dapm = &codec->dapm;
 499         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 500         struct snd_soc_card *card = rtd->card;
 501         int ret;
 502         /* Codec is ready, now add/activate board specific controls */
 503
 504         /* Store a pointer to the codec structure for tty ldisc use */
 505         cx20442_codec = codec;
 506
 507         /* Set up digital mute if not provided by the codec */
 508         if (!codec_dai->driver->ops) {
 509                 codec_dai->driver->ops = &ams_delta_dai_ops;
 510         } else if (!codec_dai->driver->ops->digital_mute) {
 511                 codec_dai->driver->ops->digital_mute = ams_delta_digital_mute;
 512         } else {
 513                 ams_delta_ops.startup = ams_delta_startup;
 514                 ams_delta_ops.shutdown = ams_delta_shutdown;
 515         }
 516
 517         /* Set codec bias level */
 518         ams_delta_set_bias_level(card, SND_SOC_BIAS_STANDBY);
 519
 520         /* Add hook switch - can be used to control the codec from userspace
 521          * even if line discipline fails */
 522         ret = snd_soc_jack_new(rtd->codec, "hook_switch",
 523                                 SND_JACK_HEADSET, &ams_delta_hook_switch);
 524         if (ret)
 525                 dev_warn(card->dev,
 526                                 "Failed to allocate resources for hook switch, "
 527                                 "will continue without one.\n");
 528         else {
 529                 ret = snd_soc_jack_add_gpios(&ams_delta_hook_switch,
 530                                         ARRAY_SIZE(ams_delta_hook_switch_gpios),
 531                                         ams_delta_hook_switch_gpios);
 532                 if (ret)
 533                         dev_warn(card->dev,
 534                                 "Failed to set up hook switch GPIO line, "
 535                                 "will continue with hook switch inactive.\n");
 536         }
 537
 538         /* Register optional line discipline for over the modem control */
 539         ret = tty_register_ldisc(N_V253, &cx81801_ops);
 540         if (ret) {
 541                 dev_warn(card->dev,
 542                                 "Failed to register line discipline, "
 543                                 "will continue without any controls.\n");
 544                 return 0;
 545         }
 546
 547         /* Add board specific DAPM widgets and routes */
 548         ret = snd_soc_dapm_new_controls(dapm, ams_delta_dapm_widgets,
 549                                         ARRAY_SIZE(ams_delta_dapm_widgets));
 550         if (ret) {
 551                 dev_warn(card->dev,
 552                                 "Failed to register DAPM controls, "
 553                                 "will continue without any.\n");
 554                 return 0;
 555         }
 556
 557         ret = snd_soc_dapm_add_routes(dapm, ams_delta_audio_map,
 558                                         ARRAY_SIZE(ams_delta_audio_map));
 559         if (ret) {
 560                 dev_warn(card->dev,
 561                                 "Failed to set up DAPM routes, "
 562                                 "will continue with codec default map.\n");
 563                 return 0;
 564         }
 565
 566         /* Set up initial pin constellation */
 567         snd_soc_dapm_disable_pin(dapm, "Mouthpiece");
 568         snd_soc_dapm_enable_pin(dapm, "Earpiece");
 569         snd_soc_dapm_enable_pin(dapm, "Microphone");
 570         snd_soc_dapm_disable_pin(dapm, "Speaker");
 571         snd_soc_dapm_disable_pin(dapm, "AGCIN");
 572         snd_soc_dapm_disable_pin(dapm, "AGCOUT");
 573         snd_soc_dapm_sync(dapm);
 574
 575         /* Add virtual switch */
 576         ret = snd_soc_add_controls(codec, ams_delta_audio_controls,
 577                                         ARRAY_SIZE(ams_delta_audio_controls));
 578         if (ret)
 579                 dev_warn(card->dev,
 580                                 "Failed to register audio mode control, "
 581                                 "will continue without it.\n");
 582
 583         return 0;
 584 }
 585
 586 /* DAI glue - connects codec <--> CPU */
 587 static struct snd_soc_dai_link ams_delta_dai_link = {
 588         .name = "CX20442",
 589         .stream_name = "CX20442",
 590         .cpu_dai_name ="omap-mcbsp-dai.0",
 591         .codec_dai_name = "cx20442-voice",
 592         .init = ams_delta_cx20442_init,
 593         .platform_name = "omap-pcm-audio",
 594         .codec_name = "cx20442-codec",
 595         .ops = &ams_delta_ops,
 596 };
 597
 598 /* Audio card driver */
 599 static struct snd_soc_card ams_delta_audio_card = {
 600         .name = "AMS_DELTA",
 601         .dai_link = &ams_delta_dai_link,
 602         .num_links = 1,
 603         .set_bias_level = ams_delta_set_bias_level,
 604 };
 605
 606 /* Module init/exit */
 607 static struct platform_device *ams_delta_audio_platform_device;
 608 static struct platform_device *cx20442_platform_device;
 609
 610 static int __init ams_delta_module_init(void)
 611 {
 612         int ret;
 613
 614         if (!(machine_is_ams_delta()))
 615                 return -ENODEV;
 616
 617         ams_delta_audio_platform_device =
 618                         platform_device_alloc("soc-audio", -1);
 619         if (!ams_delta_audio_platform_device)
 620                 return -ENOMEM;
 621
 622         platform_set_drvdata(ams_delta_audio_platform_device,
 623                                 &ams_delta_audio_card);
 624
 625         ret = platform_device_add(ams_delta_audio_platform_device);
 626         if (ret)
 627                 goto err;
 628
 629         /*
 630          * Codec platform device could be registered from elsewhere (board?),
 631          * but I do it here as it makes sense only if used with the card.
 632          */
 633         cx20442_platform_device =
 634                 platform_device_register_simple("cx20442-codec", -1, NULL, 0);
 635         return 0;
 636 err:
 637         platform_device_put(ams_delta_audio_platform_device);
 638         return ret;
 639 }
 640 module_init(ams_delta_module_init);
 641
 642 static void __exit ams_delta_module_exit(void)
 643 {
 644         if (tty_unregister_ldisc(N_V253) != 0)
 645                 dev_warn(&ams_delta_audio_platform_device->dev,
 646                         "failed to unregister V253 line discipline\n");
 647
 648         snd_soc_jack_free_gpios(&ams_delta_hook_switch,
 649                         ARRAY_SIZE(ams_delta_hook_switch_gpios),
 650                         ams_delta_hook_switch_gpios);
 651
 652         /* Keep modem power on */
 653         ams_delta_set_bias_level(&ams_delta_audio_card, SND_SOC_BIAS_STANDBY);
 654
 655         platform_device_unregister(cx20442_platform_device);
 656         platform_device_unregister(ams_delta_audio_platform_device);
 657 }
 658 module_exit(ams_delta_module_exit);
 659
 660 MODULE_AUTHOR("Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>");
 661 MODULE_DESCRIPTION("ALSA SoC driver for Amstrad E3 (Delta) videophone");
 662 MODULE_LICENSE("GPL");