sound/pci/aw2/aw2-alsa.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*****************************************************************************
   3  *
   4  * Copyright (C) 2008 Cedric Bregardis <cedric.bregardis@free.fr> and
   5  * Jean-Christian Hassler <jhassler@free.fr>
   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 <cedric.bregardis@free.fr>, "
  28               "Jean-Christian Hassler <jhassler@free.fr>");
  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                 return err;
 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                 return err;
 298
 299         /* (7) Set PCI driver data */
 300         pci_set_drvdata(pci, card);
 301
 302         dev++;
 303         return 0;
 304 }
 305
 306 /* open callback */
 307 static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream)
 308 {
 309         struct snd_pcm_runtime *runtime = substream->runtime;
 310
 311         dev_dbg(substream->pcm->card->dev, "Playback_open\n");
 312         runtime->hw = snd_aw2_playback_hw;
 313         return 0;
 314 }
 315
 316 /* close callback */
 317 static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream)
 318 {
 319         return 0;
 320
 321 }
 322
 323 static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream)
 324 {
 325         struct snd_pcm_runtime *runtime = substream->runtime;
 326
 327         dev_dbg(substream->pcm->card->dev, "Capture_open\n");
 328         runtime->hw = snd_aw2_capture_hw;
 329         return 0;
 330 }
 331
 332 /* close callback */
 333 static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream)
 334 {
 335         /* TODO: something to do ? */
 336         return 0;
 337 }
 338
 339 /* prepare callback for playback */
 340 static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream)
 341 {
 342         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 343         struct aw2 *chip = pcm_device->chip;
 344         struct snd_pcm_runtime *runtime = substream->runtime;
 345         unsigned long period_size, buffer_size;
 346
 347         mutex_lock(&chip->mtx);
 348
 349         period_size = snd_pcm_lib_period_bytes(substream);
 350         buffer_size = snd_pcm_lib_buffer_bytes(substream);
 351
 352         snd_aw2_saa7146_pcm_init_playback(&chip->saa7146,
 353                                           pcm_device->stream_number,
 354                                           runtime->dma_addr, period_size,
 355                                           buffer_size);
 356
 357         /* Define Interrupt callback */
 358         snd_aw2_saa7146_define_it_playback_callback(pcm_device->stream_number,
 359                                                     (snd_aw2_saa7146_it_cb)
 360                                                     snd_pcm_period_elapsed,
 361                                                     (void *)substream);
 362
 363         mutex_unlock(&chip->mtx);
 364
 365         return 0;
 366 }
 367
 368 /* prepare callback for capture */
 369 static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream)
 370 {
 371         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 372         struct aw2 *chip = pcm_device->chip;
 373         struct snd_pcm_runtime *runtime = substream->runtime;
 374         unsigned long period_size, buffer_size;
 375
 376         mutex_lock(&chip->mtx);
 377
 378         period_size = snd_pcm_lib_period_bytes(substream);
 379         buffer_size = snd_pcm_lib_buffer_bytes(substream);
 380
 381         snd_aw2_saa7146_pcm_init_capture(&chip->saa7146,
 382                                          pcm_device->stream_number,
 383                                          runtime->dma_addr, period_size,
 384                                          buffer_size);
 385
 386         /* Define Interrupt callback */
 387         snd_aw2_saa7146_define_it_capture_callback(pcm_device->stream_number,
 388                                                    (snd_aw2_saa7146_it_cb)
 389                                                    snd_pcm_period_elapsed,
 390                                                    (void *)substream);
 391
 392         mutex_unlock(&chip->mtx);
 393
 394         return 0;
 395 }
 396
 397 /* playback trigger callback */
 398 static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
 399                                         int cmd)
 400 {
 401         int status = 0;
 402         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 403         struct aw2 *chip = pcm_device->chip;
 404         spin_lock(&chip->reg_lock);
 405         switch (cmd) {
 406         case SNDRV_PCM_TRIGGER_START:
 407                 snd_aw2_saa7146_pcm_trigger_start_playback(&chip->saa7146,
 408                                                            pcm_device->
 409                                                            stream_number);
 410                 break;
 411         case SNDRV_PCM_TRIGGER_STOP:
 412                 snd_aw2_saa7146_pcm_trigger_stop_playback(&chip->saa7146,
 413                                                           pcm_device->
 414                                                           stream_number);
 415                 break;
 416         default:
 417                 status = -EINVAL;
 418         }
 419         spin_unlock(&chip->reg_lock);
 420         return status;
 421 }
 422
 423 /* capture trigger callback */
 424 static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
 425                                        int cmd)
 426 {
 427         int status = 0;
 428         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 429         struct aw2 *chip = pcm_device->chip;
 430         spin_lock(&chip->reg_lock);
 431         switch (cmd) {
 432         case SNDRV_PCM_TRIGGER_START:
 433                 snd_aw2_saa7146_pcm_trigger_start_capture(&chip->saa7146,
 434                                                           pcm_device->
 435                                                           stream_number);
 436                 break;
 437         case SNDRV_PCM_TRIGGER_STOP:
 438                 snd_aw2_saa7146_pcm_trigger_stop_capture(&chip->saa7146,
 439                                                          pcm_device->
 440                                                          stream_number);
 441                 break;
 442         default:
 443                 status = -EINVAL;
 444         }
 445         spin_unlock(&chip->reg_lock);
 446         return status;
 447 }
 448
 449 /* playback pointer callback */
 450 static snd_pcm_uframes_t snd_aw2_pcm_pointer_playback(struct snd_pcm_substream
 451                                                       *substream)
 452 {
 453         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 454         struct aw2 *chip = pcm_device->chip;
 455         unsigned int current_ptr;
 456
 457         /* get the current hardware pointer */
 458         struct snd_pcm_runtime *runtime = substream->runtime;
 459         current_ptr =
 460                 snd_aw2_saa7146_get_hw_ptr_playback(&chip->saa7146,
 461                                                     pcm_device->stream_number,
 462                                                     runtime->dma_area,
 463                                                     runtime->buffer_size);
 464
 465         return bytes_to_frames(substream->runtime, current_ptr);
 466 }
 467
 468 /* capture pointer callback */
 469 static snd_pcm_uframes_t snd_aw2_pcm_pointer_capture(struct snd_pcm_substream
 470                                                      *substream)
 471 {
 472         struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
 473         struct aw2 *chip = pcm_device->chip;
 474         unsigned int current_ptr;
 475
 476         /* get the current hardware pointer */
 477         struct snd_pcm_runtime *runtime = substream->runtime;
 478         current_ptr =
 479                 snd_aw2_saa7146_get_hw_ptr_capture(&chip->saa7146,
 480                                                    pcm_device->stream_number,
 481                                                    runtime->dma_area,
 482                                                    runtime->buffer_size);
 483
 484         return bytes_to_frames(substream->runtime, current_ptr);
 485 }
 486
 487 /* create a pcm device */
 488 static int snd_aw2_new_pcm(struct aw2 *chip)
 489 {
 490         struct snd_pcm *pcm_playback_ana;
 491         struct snd_pcm *pcm_playback_num;
 492         struct snd_pcm *pcm_capture;
 493         struct aw2_pcm_device *pcm_device;
 494         int err = 0;
 495
 496         /* Create new Alsa PCM device */
 497
 498         err = snd_pcm_new(chip->card, "Audiowerk2 analog playback", 0, 1, 0,
 499                           &pcm_playback_ana);
 500         if (err < 0) {
 501                 dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
 502                 return err;
 503         }
 504
 505         /* Creation ok */
 506         pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_ANA];
 507
 508         /* Set PCM device name */
 509         strcpy(pcm_playback_ana->name, "Analog playback");
 510         /* Associate private data to PCM device */
 511         pcm_playback_ana->private_data = pcm_device;
 512         /* set operators of PCM device */
 513         snd_pcm_set_ops(pcm_playback_ana, SNDRV_PCM_STREAM_PLAYBACK,
 514                         &snd_aw2_playback_ops);
 515         /* store PCM device */
 516         pcm_device->pcm = pcm_playback_ana;
 517         /* give base chip pointer to our internal pcm device
 518            structure */
 519         pcm_device->chip = chip;
 520         /* Give stream number to PCM device */
 521         pcm_device->stream_number = NUM_STREAM_PLAYBACK_ANA;
 522
 523         /* pre-allocation of buffers */
 524         /* Preallocate continuous pages. */
 525         snd_pcm_set_managed_buffer_all(pcm_playback_ana,
 526                                        SNDRV_DMA_TYPE_DEV,
 527                                        &chip->pci->dev,
 528                                        64 * 1024, 64 * 1024);
 529
 530         err = snd_pcm_new(chip->card, "Audiowerk2 digital playback", 1, 1, 0,
 531                           &pcm_playback_num);
 532
 533         if (err < 0) {
 534                 dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
 535                 return err;
 536         }
 537         /* Creation ok */
 538         pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_DIG];
 539
 540         /* Set PCM device name */
 541         strcpy(pcm_playback_num->name, "Digital playback");
 542         /* Associate private data to PCM device */
 543         pcm_playback_num->private_data = pcm_device;
 544         /* set operators of PCM device */
 545         snd_pcm_set_ops(pcm_playback_num, SNDRV_PCM_STREAM_PLAYBACK,
 546                         &snd_aw2_playback_ops);
 547         /* store PCM device */
 548         pcm_device->pcm = pcm_playback_num;
 549         /* give base chip pointer to our internal pcm device
 550            structure */
 551         pcm_device->chip = chip;
 552         /* Give stream number to PCM device */
 553         pcm_device->stream_number = NUM_STREAM_PLAYBACK_DIG;
 554
 555         /* pre-allocation of buffers */
 556         /* Preallocate continuous pages. */
 557         snd_pcm_set_managed_buffer_all(pcm_playback_num,
 558                                        SNDRV_DMA_TYPE_DEV,
 559                                        &chip->pci->dev,
 560                                        64 * 1024, 64 * 1024);
 561
 562         err = snd_pcm_new(chip->card, "Audiowerk2 capture", 2, 0, 1,
 563                           &pcm_capture);
 564
 565         if (err < 0) {
 566                 dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
 567                 return err;
 568         }
 569
 570         /* Creation ok */
 571         pcm_device = &chip->device_capture[NUM_STREAM_CAPTURE_ANA];
 572
 573         /* Set PCM device name */
 574         strcpy(pcm_capture->name, "Capture");
 575         /* Associate private data to PCM device */
 576         pcm_capture->private_data = pcm_device;
 577         /* set operators of PCM device */
 578         snd_pcm_set_ops(pcm_capture, SNDRV_PCM_STREAM_CAPTURE,
 579                         &snd_aw2_capture_ops);
 580         /* store PCM device */
 581         pcm_device->pcm = pcm_capture;
 582         /* give base chip pointer to our internal pcm device
 583            structure */
 584         pcm_device->chip = chip;
 585         /* Give stream number to PCM device */
 586         pcm_device->stream_number = NUM_STREAM_CAPTURE_ANA;
 587
 588         /* pre-allocation of buffers */
 589         /* Preallocate continuous pages. */
 590         snd_pcm_set_managed_buffer_all(pcm_capture,
 591                                        SNDRV_DMA_TYPE_DEV,
 592                                        &chip->pci->dev,
 593                                        64 * 1024, 64 * 1024);
 594
 595         /* Create control */
 596         err = snd_ctl_add(chip->card, snd_ctl_new1(&aw2_control, chip));
 597         if (err < 0) {
 598                 dev_err(chip->card->dev, "snd_ctl_add error (0x%X)\n", err);
 599                 return err;
 600         }
 601
 602         return 0;
 603 }
 604
 605 static int snd_aw2_control_switch_capture_info(struct snd_kcontrol *kcontrol,
 606                                                struct snd_ctl_elem_info *uinfo)
 607 {
 608         static const char * const texts[2] = {
 609                 "Analog", "Digital"
 610         };
 611         return snd_ctl_enum_info(uinfo, 1, 2, texts);
 612 }
 613
 614 static int snd_aw2_control_switch_capture_get(struct snd_kcontrol *kcontrol,
 615                                               struct snd_ctl_elem_value
 616                                               *ucontrol)
 617 {
 618         struct aw2 *chip = snd_kcontrol_chip(kcontrol);
 619         if (snd_aw2_saa7146_is_using_digital_input(&chip->saa7146))
 620                 ucontrol->value.enumerated.item[0] = CTL_ROUTE_DIGITAL;
 621         else
 622                 ucontrol->value.enumerated.item[0] = CTL_ROUTE_ANALOG;
 623         return 0;
 624 }
 625
 626 static int snd_aw2_control_switch_capture_put(struct snd_kcontrol *kcontrol,
 627                                               struct snd_ctl_elem_value
 628                                               *ucontrol)
 629 {
 630         struct aw2 *chip = snd_kcontrol_chip(kcontrol);
 631         int changed = 0;
 632         int is_disgital =
 633             snd_aw2_saa7146_is_using_digital_input(&chip->saa7146);
 634
 635         if (((ucontrol->value.integer.value[0] == CTL_ROUTE_DIGITAL)
 636              && !is_disgital)
 637             || ((ucontrol->value.integer.value[0] == CTL_ROUTE_ANALOG)
 638                 && is_disgital)) {
 639                 snd_aw2_saa7146_use_digital_input(&chip->saa7146, !is_disgital);
 640                 changed = 1;
 641         }
 642         return changed;
 643 }