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