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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*****************************************************************************
0003  *
0004  * Copyright (C) 2008 Cedric Bregardis <cedric.bregardis@free.fr> and
0005  * Jean-Christian Hassler <jhassler@free.fr>
0006  *
0007  * This file is part of the Audiowerk2 ALSA driver
0008  *
0009  *****************************************************************************/
0010 #include <linux/init.h>
0011 #include <linux/pci.h>
0012 #include <linux/dma-mapping.h>
0013 #include <linux/slab.h>
0014 #include <linux/interrupt.h>
0015 #include <linux/delay.h>
0016 #include <linux/io.h>
0017 #include <linux/module.h>
0018 #include <sound/core.h>
0019 #include <sound/initval.h>
0020 #include <sound/pcm.h>
0021 #include <sound/pcm_params.h>
0022 #include <sound/control.h>
0023 
0024 #include "saa7146.h"
0025 #include "aw2-saa7146.h"
0026 
0027 MODULE_AUTHOR("Cedric Bregardis <cedric.bregardis@free.fr>, "
0028           "Jean-Christian Hassler <jhassler@free.fr>");
0029 MODULE_DESCRIPTION("Emagic Audiowerk 2 sound driver");
0030 MODULE_LICENSE("GPL");
0031 
0032 /*********************************
0033  * DEFINES
0034  ********************************/
0035 #define CTL_ROUTE_ANALOG 0
0036 #define CTL_ROUTE_DIGITAL 1
0037 
0038 /*********************************
0039  * TYPEDEFS
0040  ********************************/
0041   /* hardware definition */
0042 static const struct snd_pcm_hardware snd_aw2_playback_hw = {
0043     .info = (SNDRV_PCM_INFO_MMAP |
0044          SNDRV_PCM_INFO_INTERLEAVED |
0045          SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),
0046     .formats = SNDRV_PCM_FMTBIT_S16_LE,
0047     .rates = SNDRV_PCM_RATE_44100,
0048     .rate_min = 44100,
0049     .rate_max = 44100,
0050     .channels_min = 2,
0051     .channels_max = 4,
0052     .buffer_bytes_max = 32768,
0053     .period_bytes_min = 4096,
0054     .period_bytes_max = 32768,
0055     .periods_min = 1,
0056     .periods_max = 1024,
0057 };
0058 
0059 static const struct snd_pcm_hardware snd_aw2_capture_hw = {
0060     .info = (SNDRV_PCM_INFO_MMAP |
0061          SNDRV_PCM_INFO_INTERLEAVED |
0062          SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),
0063     .formats = SNDRV_PCM_FMTBIT_S16_LE,
0064     .rates = SNDRV_PCM_RATE_44100,
0065     .rate_min = 44100,
0066     .rate_max = 44100,
0067     .channels_min = 2,
0068     .channels_max = 2,
0069     .buffer_bytes_max = 32768,
0070     .period_bytes_min = 4096,
0071     .period_bytes_max = 32768,
0072     .periods_min = 1,
0073     .periods_max = 1024,
0074 };
0075 
0076 struct aw2_pcm_device {
0077     struct snd_pcm *pcm;
0078     unsigned int stream_number;
0079     struct aw2 *chip;
0080 };
0081 
0082 struct aw2 {
0083     struct snd_aw2_saa7146 saa7146;
0084 
0085     struct pci_dev *pci;
0086     int irq;
0087     spinlock_t reg_lock;
0088     struct mutex mtx;
0089 
0090     unsigned long iobase_phys;
0091     void __iomem *iobase_virt;
0092 
0093     struct snd_card *card;
0094 
0095     struct aw2_pcm_device device_playback[NB_STREAM_PLAYBACK];
0096     struct aw2_pcm_device device_capture[NB_STREAM_CAPTURE];
0097 };
0098 
0099 /*********************************
0100  * FUNCTION DECLARATIONS
0101  ********************************/
0102 static int snd_aw2_create(struct snd_card *card, struct pci_dev *pci);
0103 static int snd_aw2_probe(struct pci_dev *pci,
0104              const struct pci_device_id *pci_id);
0105 static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream);
0106 static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream);
0107 static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream);
0108 static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream);
0109 static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream);
0110 static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream);
0111 static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
0112                     int cmd);
0113 static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
0114                        int cmd);
0115 static snd_pcm_uframes_t snd_aw2_pcm_pointer_playback(struct snd_pcm_substream
0116                               *substream);
0117 static snd_pcm_uframes_t snd_aw2_pcm_pointer_capture(struct snd_pcm_substream
0118                              *substream);
0119 static int snd_aw2_new_pcm(struct aw2 *chip);
0120 
0121 static int snd_aw2_control_switch_capture_info(struct snd_kcontrol *kcontrol,
0122                            struct snd_ctl_elem_info *uinfo);
0123 static int snd_aw2_control_switch_capture_get(struct snd_kcontrol *kcontrol,
0124                           struct snd_ctl_elem_value
0125                           *ucontrol);
0126 static int snd_aw2_control_switch_capture_put(struct snd_kcontrol *kcontrol,
0127                           struct snd_ctl_elem_value
0128                           *ucontrol);
0129 
0130 /*********************************
0131  * VARIABLES
0132  ********************************/
0133 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
0134 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
0135 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
0136 
0137 module_param_array(index, int, NULL, 0444);
0138 MODULE_PARM_DESC(index, "Index value for Audiowerk2 soundcard.");
0139 module_param_array(id, charp, NULL, 0444);
0140 MODULE_PARM_DESC(id, "ID string for the Audiowerk2 soundcard.");
0141 module_param_array(enable, bool, NULL, 0444);
0142 MODULE_PARM_DESC(enable, "Enable Audiowerk2 soundcard.");
0143 
0144 static const struct pci_device_id snd_aw2_ids[] = {
0145     {PCI_VENDOR_ID_PHILIPS, PCI_DEVICE_ID_PHILIPS_SAA7146, 0, 0,
0146      0, 0, 0},
0147     {0}
0148 };
0149 
0150 MODULE_DEVICE_TABLE(pci, snd_aw2_ids);
0151 
0152 /* pci_driver definition */
0153 static struct pci_driver aw2_driver = {
0154     .name = KBUILD_MODNAME,
0155     .id_table = snd_aw2_ids,
0156     .probe = snd_aw2_probe,
0157 };
0158 
0159 module_pci_driver(aw2_driver);
0160 
0161 /* operators for playback PCM alsa interface */
0162 static const struct snd_pcm_ops snd_aw2_playback_ops = {
0163     .open = snd_aw2_pcm_playback_open,
0164     .close = snd_aw2_pcm_playback_close,
0165     .prepare = snd_aw2_pcm_prepare_playback,
0166     .trigger = snd_aw2_pcm_trigger_playback,
0167     .pointer = snd_aw2_pcm_pointer_playback,
0168 };
0169 
0170 /* operators for capture PCM alsa interface */
0171 static const struct snd_pcm_ops snd_aw2_capture_ops = {
0172     .open = snd_aw2_pcm_capture_open,
0173     .close = snd_aw2_pcm_capture_close,
0174     .prepare = snd_aw2_pcm_prepare_capture,
0175     .trigger = snd_aw2_pcm_trigger_capture,
0176     .pointer = snd_aw2_pcm_pointer_capture,
0177 };
0178 
0179 static const struct snd_kcontrol_new aw2_control = {
0180     .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
0181     .name = "PCM Capture Route",
0182     .index = 0,
0183     .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
0184     .private_value = 0xffff,
0185     .info = snd_aw2_control_switch_capture_info,
0186     .get = snd_aw2_control_switch_capture_get,
0187     .put = snd_aw2_control_switch_capture_put
0188 };
0189 
0190 /*********************************
0191  * FUNCTION IMPLEMENTATIONS
0192  ********************************/
0193 
0194 /* component-destructor */
0195 static void snd_aw2_free(struct snd_card *card)
0196 {
0197     struct aw2 *chip = card->private_data;
0198 
0199     /* Free hardware */
0200     snd_aw2_saa7146_free(&chip->saa7146);
0201 }
0202 
0203 /* chip-specific constructor */
0204 static int snd_aw2_create(struct snd_card *card,
0205               struct pci_dev *pci)
0206 {
0207     struct aw2 *chip = card->private_data;
0208     int err;
0209 
0210     /* initialize the PCI entry */
0211     err = pcim_enable_device(pci);
0212     if (err < 0)
0213         return err;
0214     pci_set_master(pci);
0215 
0216     /* check PCI availability (32bit DMA) */
0217     if (dma_set_mask_and_coherent(&pci->dev, DMA_BIT_MASK(32))) {
0218         dev_err(card->dev, "Impossible to set 32bit mask DMA\n");
0219         return -ENXIO;
0220     }
0221 
0222     /* initialize the stuff */
0223     chip->card = card;
0224     chip->pci = pci;
0225     chip->irq = -1;
0226 
0227     /* (1) PCI resource allocation */
0228     err = pcim_iomap_regions(pci, 1 << 0, "Audiowerk2");
0229     if (err < 0)
0230         return err;
0231     chip->iobase_phys = pci_resource_start(pci, 0);
0232     chip->iobase_virt = pcim_iomap_table(pci)[0];
0233 
0234     /* (2) initialization of the chip hardware */
0235     snd_aw2_saa7146_setup(&chip->saa7146, chip->iobase_virt);
0236 
0237     if (devm_request_irq(&pci->dev, pci->irq, snd_aw2_saa7146_interrupt,
0238                  IRQF_SHARED, KBUILD_MODNAME, chip)) {
0239         dev_err(card->dev, "Cannot grab irq %d\n", pci->irq);
0240         return -EBUSY;
0241     }
0242     chip->irq = pci->irq;
0243     card->sync_irq = chip->irq;
0244     card->private_free = snd_aw2_free;
0245 
0246     dev_info(card->dev,
0247          "Audiowerk 2 sound card (saa7146 chipset) detected and managed\n");
0248     return 0;
0249 }
0250 
0251 /* constructor */
0252 static int snd_aw2_probe(struct pci_dev *pci,
0253              const struct pci_device_id *pci_id)
0254 {
0255     static int dev;
0256     struct snd_card *card;
0257     struct aw2 *chip;
0258     int err;
0259 
0260     /* (1) Continue if device is not enabled, else inc dev */
0261     if (dev >= SNDRV_CARDS)
0262         return -ENODEV;
0263     if (!enable[dev]) {
0264         dev++;
0265         return -ENOENT;
0266     }
0267 
0268     /* (2) Create card instance */
0269     err = snd_devm_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
0270                 sizeof(*chip), &card);
0271     if (err < 0)
0272         return err;
0273     chip = card->private_data;
0274 
0275     /* (3) Create main component */
0276     err = snd_aw2_create(card, pci);
0277     if (err < 0)
0278         goto error;
0279 
0280     /* initialize mutex */
0281     mutex_init(&chip->mtx);
0282     /* init spinlock */
0283     spin_lock_init(&chip->reg_lock);
0284     /* (4) Define driver ID and name string */
0285     strcpy(card->driver, "aw2");
0286     strcpy(card->shortname, "Audiowerk2");
0287 
0288     sprintf(card->longname, "%s with SAA7146 irq %i",
0289         card->shortname, chip->irq);
0290 
0291     /* (5) Create other components */
0292     snd_aw2_new_pcm(chip);
0293 
0294     /* (6) Register card instance */
0295     err = snd_card_register(card);
0296     if (err < 0)
0297         goto error;
0298 
0299     /* (7) Set PCI driver data */
0300     pci_set_drvdata(pci, card);
0301 
0302     dev++;
0303     return 0;
0304 
0305  error:
0306     snd_card_free(card);
0307     return err;
0308 }
0309 
0310 /* open callback */
0311 static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream)
0312 {
0313     struct snd_pcm_runtime *runtime = substream->runtime;
0314 
0315     dev_dbg(substream->pcm->card->dev, "Playback_open\n");
0316     runtime->hw = snd_aw2_playback_hw;
0317     return 0;
0318 }
0319 
0320 /* close callback */
0321 static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream)
0322 {
0323     return 0;
0324 
0325 }
0326 
0327 static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream)
0328 {
0329     struct snd_pcm_runtime *runtime = substream->runtime;
0330 
0331     dev_dbg(substream->pcm->card->dev, "Capture_open\n");
0332     runtime->hw = snd_aw2_capture_hw;
0333     return 0;
0334 }
0335 
0336 /* close callback */
0337 static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream)
0338 {
0339     /* TODO: something to do ? */
0340     return 0;
0341 }
0342 
0343 /* prepare callback for playback */
0344 static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream)
0345 {
0346     struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
0347     struct aw2 *chip = pcm_device->chip;
0348     struct snd_pcm_runtime *runtime = substream->runtime;
0349     unsigned long period_size, buffer_size;
0350 
0351     mutex_lock(&chip->mtx);
0352 
0353     period_size = snd_pcm_lib_period_bytes(substream);
0354     buffer_size = snd_pcm_lib_buffer_bytes(substream);
0355 
0356     snd_aw2_saa7146_pcm_init_playback(&chip->saa7146,
0357                       pcm_device->stream_number,
0358                       runtime->dma_addr, period_size,
0359                       buffer_size);
0360 
0361     /* Define Interrupt callback */
0362     snd_aw2_saa7146_define_it_playback_callback(pcm_device->stream_number,
0363                             (snd_aw2_saa7146_it_cb)
0364                             snd_pcm_period_elapsed,
0365                             (void *)substream);
0366 
0367     mutex_unlock(&chip->mtx);
0368 
0369     return 0;
0370 }
0371 
0372 /* prepare callback for capture */
0373 static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream)
0374 {
0375     struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
0376     struct aw2 *chip = pcm_device->chip;
0377     struct snd_pcm_runtime *runtime = substream->runtime;
0378     unsigned long period_size, buffer_size;
0379 
0380     mutex_lock(&chip->mtx);
0381 
0382     period_size = snd_pcm_lib_period_bytes(substream);
0383     buffer_size = snd_pcm_lib_buffer_bytes(substream);
0384 
0385     snd_aw2_saa7146_pcm_init_capture(&chip->saa7146,
0386                      pcm_device->stream_number,
0387                      runtime->dma_addr, period_size,
0388                      buffer_size);
0389 
0390     /* Define Interrupt callback */
0391     snd_aw2_saa7146_define_it_capture_callback(pcm_device->stream_number,
0392                            (snd_aw2_saa7146_it_cb)
0393                            snd_pcm_period_elapsed,
0394                            (void *)substream);
0395 
0396     mutex_unlock(&chip->mtx);
0397 
0398     return 0;
0399 }
0400 
0401 /* playback trigger callback */
0402 static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
0403                     int cmd)
0404 {
0405     int status = 0;
0406     struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
0407     struct aw2 *chip = pcm_device->chip;
0408     spin_lock(&chip->reg_lock);
0409     switch (cmd) {
0410     case SNDRV_PCM_TRIGGER_START:
0411         snd_aw2_saa7146_pcm_trigger_start_playback(&chip->saa7146,
0412                                pcm_device->
0413                                stream_number);
0414         break;
0415     case SNDRV_PCM_TRIGGER_STOP:
0416         snd_aw2_saa7146_pcm_trigger_stop_playback(&chip->saa7146,
0417                               pcm_device->
0418                               stream_number);
0419         break;
0420     default:
0421         status = -EINVAL;
0422     }
0423     spin_unlock(&chip->reg_lock);
0424     return status;
0425 }
0426 
0427 /* capture trigger callback */
0428 static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
0429                        int cmd)
0430 {
0431     int status = 0;
0432     struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
0433     struct aw2 *chip = pcm_device->chip;
0434     spin_lock(&chip->reg_lock);
0435     switch (cmd) {
0436     case SNDRV_PCM_TRIGGER_START:
0437         snd_aw2_saa7146_pcm_trigger_start_capture(&chip->saa7146,
0438                               pcm_device->
0439                               stream_number);
0440         break;
0441     case SNDRV_PCM_TRIGGER_STOP:
0442         snd_aw2_saa7146_pcm_trigger_stop_capture(&chip->saa7146,
0443                              pcm_device->
0444                              stream_number);
0445         break;
0446     default:
0447         status = -EINVAL;
0448     }
0449     spin_unlock(&chip->reg_lock);
0450     return status;
0451 }
0452 
0453 /* playback pointer callback */
0454 static snd_pcm_uframes_t snd_aw2_pcm_pointer_playback(struct snd_pcm_substream
0455                               *substream)
0456 {
0457     struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
0458     struct aw2 *chip = pcm_device->chip;
0459     unsigned int current_ptr;
0460 
0461     /* get the current hardware pointer */
0462     struct snd_pcm_runtime *runtime = substream->runtime;
0463     current_ptr =
0464         snd_aw2_saa7146_get_hw_ptr_playback(&chip->saa7146,
0465                             pcm_device->stream_number,
0466                             runtime->dma_area,
0467                             runtime->buffer_size);
0468 
0469     return bytes_to_frames(substream->runtime, current_ptr);
0470 }
0471 
0472 /* capture pointer callback */
0473 static snd_pcm_uframes_t snd_aw2_pcm_pointer_capture(struct snd_pcm_substream
0474                              *substream)
0475 {
0476     struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
0477     struct aw2 *chip = pcm_device->chip;
0478     unsigned int current_ptr;
0479 
0480     /* get the current hardware pointer */
0481     struct snd_pcm_runtime *runtime = substream->runtime;
0482     current_ptr =
0483         snd_aw2_saa7146_get_hw_ptr_capture(&chip->saa7146,
0484                            pcm_device->stream_number,
0485                            runtime->dma_area,
0486                            runtime->buffer_size);
0487 
0488     return bytes_to_frames(substream->runtime, current_ptr);
0489 }
0490 
0491 /* create a pcm device */
0492 static int snd_aw2_new_pcm(struct aw2 *chip)
0493 {
0494     struct snd_pcm *pcm_playback_ana;
0495     struct snd_pcm *pcm_playback_num;
0496     struct snd_pcm *pcm_capture;
0497     struct aw2_pcm_device *pcm_device;
0498     int err = 0;
0499 
0500     /* Create new Alsa PCM device */
0501 
0502     err = snd_pcm_new(chip->card, "Audiowerk2 analog playback", 0, 1, 0,
0503               &pcm_playback_ana);
0504     if (err < 0) {
0505         dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
0506         return err;
0507     }
0508 
0509     /* Creation ok */
0510     pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_ANA];
0511 
0512     /* Set PCM device name */
0513     strcpy(pcm_playback_ana->name, "Analog playback");
0514     /* Associate private data to PCM device */
0515     pcm_playback_ana->private_data = pcm_device;
0516     /* set operators of PCM device */
0517     snd_pcm_set_ops(pcm_playback_ana, SNDRV_PCM_STREAM_PLAYBACK,
0518             &snd_aw2_playback_ops);
0519     /* store PCM device */
0520     pcm_device->pcm = pcm_playback_ana;
0521     /* give base chip pointer to our internal pcm device
0522        structure */
0523     pcm_device->chip = chip;
0524     /* Give stream number to PCM device */
0525     pcm_device->stream_number = NUM_STREAM_PLAYBACK_ANA;
0526 
0527     /* pre-allocation of buffers */
0528     /* Preallocate continuous pages. */
0529     snd_pcm_set_managed_buffer_all(pcm_playback_ana,
0530                        SNDRV_DMA_TYPE_DEV,
0531                        &chip->pci->dev,
0532                        64 * 1024, 64 * 1024);
0533 
0534     err = snd_pcm_new(chip->card, "Audiowerk2 digital playback", 1, 1, 0,
0535               &pcm_playback_num);
0536 
0537     if (err < 0) {
0538         dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
0539         return err;
0540     }
0541     /* Creation ok */
0542     pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_DIG];
0543 
0544     /* Set PCM device name */
0545     strcpy(pcm_playback_num->name, "Digital playback");
0546     /* Associate private data to PCM device */
0547     pcm_playback_num->private_data = pcm_device;
0548     /* set operators of PCM device */
0549     snd_pcm_set_ops(pcm_playback_num, SNDRV_PCM_STREAM_PLAYBACK,
0550             &snd_aw2_playback_ops);
0551     /* store PCM device */
0552     pcm_device->pcm = pcm_playback_num;
0553     /* give base chip pointer to our internal pcm device
0554        structure */
0555     pcm_device->chip = chip;
0556     /* Give stream number to PCM device */
0557     pcm_device->stream_number = NUM_STREAM_PLAYBACK_DIG;
0558 
0559     /* pre-allocation of buffers */
0560     /* Preallocate continuous pages. */
0561     snd_pcm_set_managed_buffer_all(pcm_playback_num,
0562                        SNDRV_DMA_TYPE_DEV,
0563                        &chip->pci->dev,
0564                        64 * 1024, 64 * 1024);
0565 
0566     err = snd_pcm_new(chip->card, "Audiowerk2 capture", 2, 0, 1,
0567               &pcm_capture);
0568 
0569     if (err < 0) {
0570         dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
0571         return err;
0572     }
0573 
0574     /* Creation ok */
0575     pcm_device = &chip->device_capture[NUM_STREAM_CAPTURE_ANA];
0576 
0577     /* Set PCM device name */
0578     strcpy(pcm_capture->name, "Capture");
0579     /* Associate private data to PCM device */
0580     pcm_capture->private_data = pcm_device;
0581     /* set operators of PCM device */
0582     snd_pcm_set_ops(pcm_capture, SNDRV_PCM_STREAM_CAPTURE,
0583             &snd_aw2_capture_ops);
0584     /* store PCM device */
0585     pcm_device->pcm = pcm_capture;
0586     /* give base chip pointer to our internal pcm device
0587        structure */
0588     pcm_device->chip = chip;
0589     /* Give stream number to PCM device */
0590     pcm_device->stream_number = NUM_STREAM_CAPTURE_ANA;
0591 
0592     /* pre-allocation of buffers */
0593     /* Preallocate continuous pages. */
0594     snd_pcm_set_managed_buffer_all(pcm_capture,
0595                        SNDRV_DMA_TYPE_DEV,
0596                        &chip->pci->dev,
0597                        64 * 1024, 64 * 1024);
0598 
0599     /* Create control */
0600     err = snd_ctl_add(chip->card, snd_ctl_new1(&aw2_control, chip));
0601     if (err < 0) {
0602         dev_err(chip->card->dev, "snd_ctl_add error (0x%X)\n", err);
0603         return err;
0604     }
0605 
0606     return 0;
0607 }
0608 
0609 static int snd_aw2_control_switch_capture_info(struct snd_kcontrol *kcontrol,
0610                            struct snd_ctl_elem_info *uinfo)
0611 {
0612     static const char * const texts[2] = {
0613         "Analog", "Digital"
0614     };
0615     return snd_ctl_enum_info(uinfo, 1, 2, texts);
0616 }
0617 
0618 static int snd_aw2_control_switch_capture_get(struct snd_kcontrol *kcontrol,
0619                           struct snd_ctl_elem_value
0620                           *ucontrol)
0621 {
0622     struct aw2 *chip = snd_kcontrol_chip(kcontrol);
0623     if (snd_aw2_saa7146_is_using_digital_input(&chip->saa7146))
0624         ucontrol->value.enumerated.item[0] = CTL_ROUTE_DIGITAL;
0625     else
0626         ucontrol->value.enumerated.item[0] = CTL_ROUTE_ANALOG;
0627     return 0;
0628 }
0629 
0630 static int snd_aw2_control_switch_capture_put(struct snd_kcontrol *kcontrol,
0631                           struct snd_ctl_elem_value
0632                           *ucontrol)
0633 {
0634     struct aw2 *chip = snd_kcontrol_chip(kcontrol);
0635     int changed = 0;
0636     int is_disgital =
0637         snd_aw2_saa7146_is_using_digital_input(&chip->saa7146);
0638 
0639     if (((ucontrol->value.integer.value[0] == CTL_ROUTE_DIGITAL)
0640          && !is_disgital)
0641         || ((ucontrol->value.integer.value[0] == CTL_ROUTE_ANALOG)
0642         && is_disgital)) {
0643         snd_aw2_saa7146_use_digital_input(&chip->saa7146, !is_disgital);
0644         changed = 1;
0645     }
0646     return changed;
0647 }
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