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