kernel/sound/soc/codecs/ics43432.c

   1 /*
   2  * I2S MEMS microphone driver for InvenSense ICS-43432
   3  *
   4  * - Non configurable.
   5  * - I2S interface, 64 BCLs per frame, 32 bits per channel, 24 bit data
   6  *
   7  * Copyright (c) 2015 Axis Communications AB
   8  *
   9  * Licensed under GPL v2.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <sound/core.h>
  16 #include <sound/pcm.h>
  17 #include <sound/pcm_params.h>
  18 #include <sound/soc.h>
  19 #include <sound/initval.h>
  20 #include <sound/tlv.h>
  21
  22 #define ICS43432_RATE_MIN 7190 /* Hz, from data sheet */
  23 #define ICS43432_RATE_MAX 52800  /* Hz, from data sheet */
  24
  25 #define ICS43432_FORMATS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32)
  26
  27 static struct snd_soc_dai_driver ics43432_dai = {
  28         .name = "ics43432-hifi",
  29         .capture = {
  30                 .stream_name = "Capture",
  31                 .channels_min = 1,
  32                 .channels_max = 2,
  33                 .rate_min = ICS43432_RATE_MIN,
  34                 .rate_max = ICS43432_RATE_MAX,
  35                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
  36                 .formats = ICS43432_FORMATS,
  37         },
  38 };
  39
  40 static struct snd_soc_codec_driver ics43432_codec_driver = {
  41 };
  42
  43 static int ics43432_probe(struct platform_device *pdev)
  44 {
  45         return snd_soc_register_codec(&pdev->dev, &ics43432_codec_driver,
  46                         &ics43432_dai, 1);
  47 }
  48
  49 static int ics43432_remove(struct platform_device *pdev)
  50 {
  51         snd_soc_unregister_codec(&pdev->dev);
  52         return 0;
  53 }
  54
  55 #ifdef CONFIG_OF
  56 static const struct of_device_id ics43432_ids[] = {
  57         { .compatible = "invensense,ics43432", },
  58         { }
  59 };
  60 MODULE_DEVICE_TABLE(of, ics43432_ids);
  61 #endif
  62
  63 static struct platform_driver ics43432_driver = {
  64         .driver = {
  65                 .name = "ics43432",
  66                 .of_match_table = of_match_ptr(ics43432_ids),
  67         },
  68         .probe = ics43432_probe,
  69         .remove = ics43432_remove,
  70 };
  71
  72 module_platform_driver(ics43432_driver);
  73
  74 MODULE_DESCRIPTION("ASoC ICS43432 driver");
  75 MODULE_AUTHOR("Ricard Wanderlof <ricardw@axis.com>");
  76 MODULE_LICENSE("GPL v2");