sound/pci/aw2/aw2-alsa.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*****************************************************************************
   3  *
   4  * Copyright (C) 2008 Cedric Bregardis <[email protected]> and
   5  * Jean-Christian Hassler <[email protected]>
   6  *
   7  * This file is part of the Audiowerk2 ALSA driver
   8  *
   9  *****************************************************************************/
  10 #include <linux/init.h>
  11 #include <linux/pci.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/slab.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/delay.h>
  16 #include <linux/io.h>
  17 #include <linux/module.h>
  18 #include <sound/core.h>
  19 #include <sound/initval.h>
  20 #include <sound/pcm.h>
  21 #include <sound/pcm_params.h>
  22 #include <sound/control.h>
  23
  24 #include "saa7146.h"
  25 #include "aw2-saa7146.h"
  26
  27 MODULE_AUTHOR("Cedric Bregardis <[email protected]>, "
  28               "Jean-Christian Hassler <[email protected]>");
  29 MODULE_DESCRIPTION("Emagic Audiowerk 2 sound driver");
  30 MODULE_LICENSE("GPL");
  31
  32 /*********************************
  33  * DEFINES
  34  ********************************/
  35 #define CTL_ROUTE_ANALOG 0
  36 #define CTL_ROUTE_DIGITAL 1
  37
  38 /*********************************
  39  * TYPEDEFS
  40  ********************************/
  41   /* hardware definition */
  42 static const struct snd_pcm_hardware snd_aw2_playback_hw = {
  43         .info = (SNDRV_PCM_INFO_MMAP |
  44                  SNDRV_PCM_INFO_INTERLEAVED |
  45                  SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),
  46         .formats = SNDRV_PCM_FMTBIT_S16_LE,
  47         .rates = SNDRV_PCM_RATE_44100,
  48         .rate_min = 44100,
  49         .rate_max = 44100,
  50         .channels_min = 2,
  51         .channels_max = 4,
  52         .buffer_bytes_max = 32768,
  53         .period_bytes_min = 4096,
  54         .period_bytes_max = 32768,
  55         .periods_min = 1,
  56         .periods_max = 1024,
  57 };
  58
  59 static const struct snd_pcm_hardware snd_aw2_capture_hw = {
  60         .info = (SNDRV_PCM_INFO_MMAP |
  61                  SNDRV_PCM_INFO_INTERLEAVED |
  62                  SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),
  63         .formats = SNDRV_PCM_FMTBIT_S16_LE,
  64         .rates = SNDRV_PCM_RATE_44100,
  65         .rate_min = 44100,
  66         .rate_max = 44100,
  67         .channels_min = 2,
  68         .channels_max = 2,
  69         .buffer_bytes_max = 32768,
  70         .period_bytes_min = 4096,
  71         .period_bytes_max = 32768,
  72         .periods_min = 1,
  73         .periods_max = 1024,
  74 };
  75
  76 struct aw2_pcm_device {
  77         struct snd_pcm *pcm;
  78         unsigned int stream_number;
  79         struct aw2 *chip;
  80 };
  81
  82 struct aw2 {
  83         struct snd_aw2_saa7146 saa7146;
  84
  85         struct pci_dev *pci;
  86         int irq;
  87         spinlock_t reg_lock;
  88         struct mutex mtx;
  89
  90         unsigned long iobase_phys;
  91         void __iomem *iobase_virt;
  92
  93         struct snd_card *card;
  94
  95         struct aw2_pcm_device device_playback[NB_STREAM_PLAYBACK];
  96         struct aw2_pcm_device device_capture[NB_STREAM_CAPTURE];
  97 };
  98
  99 /*********************************
 100  * FUNCTION DECLARATIONS
 101  ********************************/
 102 static int snd_aw2_create(struct snd_card *card, struct pci_dev *pci);
 103 static int snd_aw2_probe(struct pci_dev *pci,
 104                          const struct pci_device_id *pci_id);
 105 static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream);
 106 static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream);
 107 static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream);
 108 static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream);
 109 static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream);
 110 static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream);
 111 static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
 112                                         int cmd);
 113 static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
 114                                        int cmd);
 115 static snd_pcm_uframes_t snd_aw2_pcm_pointer_playback(struct snd_pcm_substream
 116                                                       *substream);
 117 static snd_pcm_uframes_t snd_aw2_pcm_pointer_capture(struct snd_pcm_substream
 118                                                      *substream);
 119 static int snd_aw2_new_pcm(struct aw2 *chip);
 120
 121 static int snd_aw2_control_switch_capture_info(struct snd_kcontrol *kcontrol,
 122                                                struct snd_ctl_elem_info *uinfo);
 123 static int snd_aw2_control_switch_capture_get(struct snd_kcontrol *kcontrol,
 124                                               struct snd_ctl_elem_value
 125                                               *ucontrol);
 126 static int snd_aw2_control_switch_capture_put(struct snd_kcontrol *kcontrol,
 127                                               struct snd_ctl_elem_value
 128                                               *ucontrol);
 129
 130 /*********************************
 131  * VARIABLES
 132  ********************************/
 133 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
 134 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
 135 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
 136
 137 module_param_array(index, int, NULL, 0444);
 138 MODULE_PARM_DESC(index, "Index value for Audiowerk2 soundcard.");
 139 module_param_array(id, charp, NULL, 0444);
 140 MODULE_PARM_DESC(id, "ID string for the Audiowerk2 soundcard.");
 141 module_param_array(enable, bool, NULL, 0444);
 142 MODULE_PARM_DESC(enable, "Enable Audiowerk2 soundcard.");
 143
 144 static const struct pci_device_id snd_aw2_ids[] = {
 145         {PCI_VENDOR_ID_PHILIPS, PCI_DEVICE_ID_PHILIPS_SAA7146, 0, 0,
 146          0, 0, 0},
 147         {0}
 148 };
 149
 150 MODULE_DEVICE_TABLE(pci, snd_aw2_ids);
 151
 152 /* pci_driver definition */
 153 static struct pci_driver aw2_driver = {
 154         .name = KBUILD_MODNAME,
 155         .id_table = snd_aw2_ids,
 156         .probe = snd_aw2_probe,
 157 };
 158
 159 module_pci_driver(aw2_driver);
 160
 161 /* operators for playback PCM alsa interface */
 162 static const struct snd_pcm_ops snd_aw2_playback_ops = {
 163         .open = snd_aw2_pcm_playback_open,
 164         .close = snd_aw2_pcm_playback_close,
 165         .prepare = snd_aw2_pcm_prepare_playback,
 166         .trigger = snd_aw2_pcm_trigger_playback,
 167         .pointer = snd_aw2_pcm_pointer_playback,
 168 };
 169
 170 /* operators for capture PCM alsa interface */
 171 static const struct snd_pcm_ops snd_aw2_capture_ops = {
 172         .open = snd_aw2_pcm_capture_open,
 173         .close = snd_aw2_pcm_capture_close,
 174         .prepare = snd_aw2_pcm_prepare_capture,
 175         .trigger = snd_aw2_pcm_trigger_capture,
 176         .pointer = snd_aw2_pcm_pointer_capture,
 177 };
 178
 179 static const struct snd_kcontrol_new aw2_control = {
 180         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 181         .name = "PCM Capture Route",
 182         .index = 0,
 183         .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 184         .private_value = 0xffff,
 185         .info = snd_aw2_control_switch_capture_info,
 186         .get = snd_aw2_control_switch_capture_get,
 187         .put = snd_aw2_control_switch_capture_put
 188 };
 189
 190 /*********************************
 191  * FUNCTION IMPLEMENTATIONS
 192  ********************************/
 193
 194 /* component-destructor */
 195 static void snd_aw2_free(struct snd_card *card)
 196 {
 197         struct aw2 *chip = card->private_data;
 198
 199         /* Free hardware */
 200         snd_aw2_saa7146_free(&chip->saa7146);
 201 }
 202
 203 /* chip-specific constructor */
 204 static int snd_aw2_create(struct snd_card *card,
 205                           struct pci_dev *pci)
 206 {
 207         struct aw2 *chip = card->private_data;
 208         int err;
 209
 210         /* initialize the PCI entry */
 211         err = pcim_enable_device(pci);
 212         if (err < 0)
 213                 return err;
 214         pci_set_master(pci);
 215
 216         /* check PCI availability (32bit DMA) */
 217         if (dma_set_mask_and_coherent(&pci->dev, DMA_BIT_MASK(32))) {
 218                 dev_err(card->dev, "Impossible to set 32bit mask DMA\n");
 219                 return -ENXIO;
 220         }
 221
 222         /* initialize the stuff */
 223         chip->card = card;
 224         chip->pci = pci;
 225         chip->irq = -1;
 226
 227         /* (1) PCI resource allocation */
 228         err = pcim_iomap_regions(pci, 1 << 0, "Audiowerk2");
 229         if (err < 0)
 230                 return err;
 231         chip->iobase_phys = pci_resource_start(pci, 0);
 232         chip->iobase_virt = pcim_iomap_table(pci)[0];
 233
 234         /* (2) initialization of the chip hardware */
 235         snd_aw2_saa7146_setup(&chip->saa7146, chip->iobase_virt);
 236
 237         if (devm_request_irq(&pci->dev, pci->irq, snd_aw2_saa7146_interrupt,
 238                              IRQF_SHARED, KBUILD_MODNAME, chip)) {
 239                 dev_err(card->dev, "Cannot grab irq %d\n", pci->irq);
 240                 return -EBUSY;
 241         }
 242         chip->irq = pci->irq;
 243         card->sync_irq = chip->irq;
 244         card->private_free = snd_aw2_free;
 245
 246         dev_info(card->dev,
 247                  "Audiowerk 2 sound card (saa7146 chipset) detected and managed\n");
 248         return 0;
 249 }
 250
 251 /* constructor */
 252 static int snd_aw2_probe(struct pci_dev *pci,
 253                          const struct pci_device_id *pci_id)
 254 {
 255         static int dev;
 256         struct snd_card *card;
 257         struct aw2 *chip;
 258         int err;
 259
 260         /* (1) Continue if device is not enabled, else inc dev */
 261         if (dev >= SNDRV_CARDS)
 262                 return -ENODEV;
 263         if (!enable[dev]) {
 264                 dev++;
 265                 return -ENOENT;
 266         }
 267
 268         /* (2) Create card instance */
 269         err = snd_devm_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
 270                                 sizeof(*chip), &card);
 271         if (err < 0)
 272                 return err;
 273         chip = card->private_data;
 274
 275         /* (3) Create main component */
 276         err = snd_aw2_create(card, pci);
 277         if (err < 0)
 278                 goto error;
 279
 280         /* initialize mutex */
 281         mutex_init(&chip->mtx);
 282         /* init spinlock */
 283         spin_lock_init(&chip->reg_lock);
 284         /* (4) Define driver ID and name string */
 285         strcpy(card->driver, "aw2");
 286         strcpy(card->shortname, "Audiowerk2");
 287
 288         sprintf(card->longname, "%s with SAA7146 irq %i",
 289                 card->shortname, chip->irq);
 290
 291         /* (5) Create other components */
 292         snd_aw2_new_pcm(chip);
 293
 294         /* (6) Register card instance */
 295         err = snd_card_register(card);
 296         if (err < 0)
 297                 goto error;
 298
 299         /* (7) Set PCI driver data */
 300         pci_set_drvdata(pci, card);
 301
 302         dev++;
 303         return 0;
 304
 305  error:
 306         snd_card_free(card);
 307         return err;
 308 }
 309
 310 /* open callback */
 311 static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream)
 312 {
 313         struct snd_pcm_runtime *runtime = substream->runtime;
 314
 315         dev_dbg(substream->pcm->card->dev, "Playback_open\n");
 316         runtime->hw = snd_aw2_playback_hw;
 317         return 0;
 318 }
 319
 320 /* close callback */
 321 static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream)
 322 {
 323         return 0;
 324
 325 }
 326
 327 static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream)
 328 {
 329         struct snd_pcm_runtime *runtime = substream->runtime;
 330
 331         dev_dbg(substream->pcm->card->dev, "Capture_open\n");
 332         runtime->hw = snd_aw2_capture_hw;
 333         return 0;
 334 }
 335
 336 /* close callback */
 337 static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream)
 338 {
 339         /* TODO: something to do ? */
 340         return 0;
 341 }
 342
 343 /* prepare callback for playback */
 344 static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream)
 345 {
 346         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 347         struct aw2 *chip = pcm_device->chip;
 348         struct snd_pcm_runtime *runtime = substream->runtime;
 349         unsigned long period_size, buffer_size;
 350
 351         mutex_lock(&chip->mtx);
 352
 353         period_size = snd_pcm_lib_period_bytes(substream);
 354         buffer_size = snd_pcm_lib_buffer_bytes(substream);
 355
 356         snd_aw2_saa7146_pcm_init_playback(&chip->saa7146,
 357                                           pcm_device->stream_number,
 358                                           runtime->dma_addr, period_size,
 359                                           buffer_size);
 360
 361         /* Define Interrupt callback */
 362         snd_aw2_saa7146_define_it_playback_callback(pcm_device->stream_number,
 363                                                     (snd_aw2_saa7146_it_cb)
 364                                                     snd_pcm_period_elapsed,
 365                                                     (void *)substream);
 366
 367         mutex_unlock(&chip->mtx);
 368
 369         return 0;
 370 }
 371
 372 /* prepare callback for capture */
 373 static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream)
 374 {
 375         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 376         struct aw2 *chip = pcm_device->chip;
 377         struct snd_pcm_runtime *runtime = substream->runtime;
 378         unsigned long period_size, buffer_size;
 379
 380         mutex_lock(&chip->mtx);
 381
 382         period_size = snd_pcm_lib_period_bytes(substream);
 383         buffer_size = snd_pcm_lib_buffer_bytes(substream);
 384
 385         snd_aw2_saa7146_pcm_init_capture(&chip->saa7146,
 386                                          pcm_device->stream_number,
 387                                          runtime->dma_addr, period_size,
 388                                          buffer_size);
 389
 390         /* Define Interrupt callback */
 391         snd_aw2_saa7146_define_it_capture_callback(pcm_device->stream_number,
 392                                                    (snd_aw2_saa7146_it_cb)
 393                                                    snd_pcm_period_elapsed,
 394                                                    (void *)substream);
 395
 396         mutex_unlock(&chip->mtx);
 397
 398         return 0;
 399 }
 400
 401 /* playback trigger callback */
 402 static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
 403                                         int cmd)
 404 {
 405         int status = 0;
 406         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 407         struct aw2 *chip = pcm_device->chip;
 408         spin_lock(&chip->reg_lock);
 409         switch (cmd) {
 410         case SNDRV_PCM_TRIGGER_START:
 411                 snd_aw2_saa7146_pcm_trigger_start_playback(&chip->saa7146,
 412                                                            pcm_device->
 413                                                            stream_number);
 414                 break;
 415         case SNDRV_PCM_TRIGGER_STOP:
 416                 snd_aw2_saa7146_pcm_trigger_stop_playback(&chip->saa7146,
 417                                                           pcm_device->
 418                                                           stream_number);
 419                 break;
 420         default:
 421                 status = -EINVAL;
 422         }
 423         spin_unlock(&chip->reg_lock);
 424         return status;
 425 }
 426
 427 /* capture trigger callback */
 428 static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
 429                                        int cmd)
 430 {
 431         int status = 0;
 432         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 433         struct aw2 *chip = pcm_device->chip;
 434         spin_lock(&chip->reg_lock);
 435         switch (cmd) {
 436         case SNDRV_PCM_TRIGGER_START:
 437                 snd_aw2_saa7146_pcm_trigger_start_capture(&chip->saa7146,
 438                                                           pcm_device->
 439                                                           stream_number);
 440                 break;
 441         case SNDRV_PCM_TRIGGER_STOP:
 442                 snd_aw2_saa7146_pcm_trigger_stop_capture(&chip->saa7146,
 443                                                          pcm_device->
 444                                                          stream_number);
 445                 break;
 446         default:
 447                 status = -EINVAL;
 448         }
 449         spin_unlock(&chip->reg_lock);
 450         return status;
 451 }
 452
 453 /* playback pointer callback */
 454 static snd_pcm_uframes_t snd_aw2_pcm_pointer_playback(struct snd_pcm_substream
 455                                                       *substream)
 456 {
 457         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 458         struct aw2 *chip = pcm_device->chip;
 459         unsigned int current_ptr;
 460
 461         /* get the current hardware pointer */
 462         struct snd_pcm_runtime *runtime = substream->runtime;
 463         current_ptr =
 464                 snd_aw2_saa7146_get_hw_ptr_playback(&chip->saa7146,
 465                                                     pcm_device->stream_number,
 466                                                     runtime->dma_area,
 467                                                     runtime->buffer_size);
 468
 469         return bytes_to_frames(substream->runtime, current_ptr);
 470 }
 471
 472 /* capture pointer callback */
 473 static snd_pcm_uframes_t snd_aw2_pcm_pointer_capture(struct snd_pcm_substream
 474                                                      *substream)
 475 {
 476         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 477         struct aw2 *chip = pcm_device->chip;
 478         unsigned int current_ptr;
 479
 480         /* get the current hardware pointer */
 481         struct snd_pcm_runtime *runtime = substream->runtime;
 482         current_ptr =
 483                 snd_aw2_saa7146_get_hw_ptr_capture(&chip->saa7146,
 484                                                    pcm_device->stream_number,
 485                                                    runtime->dma_area,
 486                                                    runtime->buffer_size);
 487
 488         return bytes_to_frames(substream->runtime, current_ptr);
 489 }
 490
 491 /* create a pcm device */
 492 static int snd_aw2_new_pcm(struct aw2 *chip)
 493 {
 494         struct snd_pcm *pcm_playback_ana;
 495         struct snd_pcm *pcm_playback_num;
 496         struct snd_pcm *pcm_capture;
 497         struct aw2_pcm_device *pcm_device;
 498         int err = 0;
 499
 500         /* Create new Alsa PCM device */
 501
 502         err = snd_pcm_new(chip->card, "Audiowerk2 analog playback", 0, 1, 0,
 503                           &pcm_playback_ana);
 504         if (err < 0) {
 505                 dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
 506                 return err;
 507         }
 508
 509         /* Creation ok */
 510         pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_ANA];
 511
 512         /* Set PCM device name */
 513         strcpy(pcm_playback_ana->name, "Analog playback");
 514         /* Associate private data to PCM device */
 515         pcm_playback_ana->private_data = pcm_device;
 516         /* set operators of PCM device */
 517         snd_pcm_set_ops(pcm_playback_ana, SNDRV_PCM_STREAM_PLAYBACK,
 518                         &snd_aw2_playback_ops);
 519         /* store PCM device */
 520         pcm_device->pcm = pcm_playback_ana;
 521         /* give base chip pointer to our internal pcm device
 522            structure */
 523         pcm_device->chip = chip;
 524         /* Give stream number to PCM device */
 525         pcm_device->stream_number = NUM_STREAM_PLAYBACK_ANA;
 526
 527         /* pre-allocation of buffers */
 528         /* Preallocate continuous pages. */
 529         snd_pcm_set_managed_buffer_all(pcm_playback_ana,
 530                                        SNDRV_DMA_TYPE_DEV,
 531                                        &chip->pci->dev,
 532                                        64 * 1024, 64 * 1024);
 533
 534         err = snd_pcm_new(chip->card, "Audiowerk2 digital playback", 1, 1, 0,
 535                           &pcm_playback_num);
 536
 537         if (err < 0) {
 538                 dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
 539                 return err;
 540         }
 541         /* Creation ok */
 542         pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_DIG];
 543
 544         /* Set PCM device name */
 545         strcpy(pcm_playback_num->name, "Digital playback");
 546         /* Associate private data to PCM device */
 547         pcm_playback_num->private_data = pcm_device;
 548         /* set operators of PCM device */
 549         snd_pcm_set_ops(pcm_playback_num, SNDRV_PCM_STREAM_PLAYBACK,
 550                         &snd_aw2_playback_ops);
 551         /* store PCM device */
 552         pcm_device->pcm = pcm_playback_num;
 553         /* give base chip pointer to our internal pcm device
 554            structure */
 555         pcm_device->chip = chip;
 556         /* Give stream number to PCM device */
 557         pcm_device->stream_number = NUM_STREAM_PLAYBACK_DIG;
 558
 559         /* pre-allocation of buffers */
 560         /* Preallocate continuous pages. */
 561         snd_pcm_set_managed_buffer_all(pcm_playback_num,
 562                                        SNDRV_DMA_TYPE_DEV,
 563                                        &chip->pci->dev,
 564                                        64 * 1024, 64 * 1024);
 565
 566         err = snd_pcm_new(chip->card, "Audiowerk2 capture", 2, 0, 1,
 567                           &pcm_capture);
 568
 569         if (err < 0) {
 570                 dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
 571                 return err;
 572         }
 573
 574         /* Creation ok */
 575         pcm_device = &chip->device_capture[NUM_STREAM_CAPTURE_ANA];
 576
 577         /* Set PCM device name */
 578         strcpy(pcm_capture->name, "Capture");
 579         /* Associate private data to PCM device */
 580         pcm_capture->private_data = pcm_device;
 581         /* set operators of PCM device */
 582         snd_pcm_set_ops(pcm_capture, SNDRV_PCM_STREAM_CAPTURE,
 583                         &snd_aw2_capture_ops);
 584         /* store PCM device */
 585         pcm_device->pcm = pcm_capture;
 586         /* give base chip pointer to our internal pcm device
 587            structure */
 588         pcm_device->chip = chip;
 589         /* Give stream number to PCM device */
 590         pcm_device->stream_number = NUM_STREAM_CAPTURE_ANA;
 591
 592         /* pre-allocation of buffers */
 593         /* Preallocate continuous pages. */
 594         snd_pcm_set_managed_buffer_all(pcm_capture,
 595                                        SNDRV_DMA_TYPE_DEV,
 596                                        &chip->pci->dev,
 597                                        64 * 1024, 64 * 1024);
 598
 599         /* Create control */
 600         err = snd_ctl_add(chip->card, snd_ctl_new1(&aw2_control, chip));
 601         if (err < 0) {
 602                 dev_err(chip->card->dev, "snd_ctl_add error (0x%X)\n", err);
 603                 return err;
 604         }
 605
 606         return 0;
 607 }
 608
 609 static int snd_aw2_control_switch_capture_info(struct snd_kcontrol *kcontrol,
 610                                                struct snd_ctl_elem_info *uinfo)
 611 {
 612         static const char * const texts[2] = {
 613                 "Analog", "Digital"
 614         };
 615         return snd_ctl_enum_info(uinfo, 1, 2, texts);
 616 }
 617
 618 static int snd_aw2_control_switch_capture_get(struct snd_kcontrol *kcontrol,
 619                                               struct snd_ctl_elem_value
 620                                               *ucontrol)
 621 {
 622         struct aw2 *chip = snd_kcontrol_chip(kcontrol);
 623         if (snd_aw2_saa7146_is_using_digital_input(&chip->saa7146))
 624                 ucontrol->value.enumerated.item[0] = CTL_ROUTE_DIGITAL;
 625         else
 626                 ucontrol->value.enumerated.item[0] = CTL_ROUTE_ANALOG;
 627         return 0;
 628 }
 629
 630 static int snd_aw2_control_switch_capture_put(struct snd_kcontrol *kcontrol,
 631                                               struct snd_ctl_elem_value
 632                                               *ucontrol)
 633 {
 634         struct aw2 *chip = snd_kcontrol_chip(kcontrol);
 635         int changed = 0;
 636         int is_disgital =
 637             snd_aw2_saa7146_is_using_digital_input(&chip->saa7146);
 638
 639         if (((ucontrol->value.integer.value[0] == CTL_ROUTE_DIGITAL)
 640              && !is_disgital)
 641             || ((ucontrol->value.integer.value[0] == CTL_ROUTE_ANALOG)
 642                 && is_disgital)) {
 643                 snd_aw2_saa7146_use_digital_input(&chip->saa7146, !is_disgital);
 644                 changed = 1;
 645         }
 646         return changed;
 647 }