sound/soc/codecs/dmic.c

   1 /*
   2  * dmic.c  --  SoC audio for Generic Digital MICs
   3  *
   4  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18  * 02110-1301 USA
  19  *
  20  */
  21
  22 #include <linux/platform_device.h>
  23 #include <linux/slab.h>
  24 #include <linux/module.h>
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/soc.h>
  28 #include <sound/soc-dapm.h>
  29
  30 static struct snd_soc_dai_driver dmic_dai = {
  31         .name = "dmic-hifi",
  32         .capture = {
  33                 .stream_name = "Capture",
  34                 .channels_min = 1,
  35                 .channels_max = 8,
  36                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
  37                 .formats = SNDRV_PCM_FMTBIT_S32_LE
  38                         | SNDRV_PCM_FMTBIT_S24_LE
  39                         | SNDRV_PCM_FMTBIT_S16_LE,
  40         },
  41 };
  42
  43 static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
  44         SND_SOC_DAPM_AIF_OUT("DMIC AIF", "Capture", 0,
  45                              SND_SOC_NOPM, 0, 0),
  46         SND_SOC_DAPM_INPUT("DMic"),
  47 };
  48
  49 static const struct snd_soc_dapm_route intercon[] = {
  50         {"DMIC AIF", NULL, "DMic"},
  51 };
  52
  53 static int dmic_probe(struct snd_soc_codec *codec)
  54 {
  55         struct snd_soc_dapm_context *dapm = &codec->dapm;
  56
  57         snd_soc_dapm_new_controls(dapm, dmic_dapm_widgets,
  58                                   ARRAY_SIZE(dmic_dapm_widgets));
  59         snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
  60         snd_soc_dapm_new_widgets(dapm);
  61
  62         return 0;
  63 }
  64
  65 static struct snd_soc_codec_driver soc_dmic = {
  66         .probe  = dmic_probe,
  67 };
  68
  69 static int dmic_dev_probe(struct platform_device *pdev)
  70 {
  71         return snd_soc_register_codec(&pdev->dev,
  72                         &soc_dmic, &dmic_dai, 1);
  73 }
  74
  75 static int dmic_dev_remove(struct platform_device *pdev)
  76 {
  77         snd_soc_unregister_codec(&pdev->dev);
  78         return 0;
  79 }
  80
  81 MODULE_ALIAS("platform:dmic-codec");
  82
  83 static struct platform_driver dmic_driver = {
  84         .driver = {
  85                 .name = "dmic-codec",
  86                 .owner = THIS_MODULE,
  87         },
  88         .probe = dmic_dev_probe,
  89         .remove = dmic_dev_remove,
  90 };
  91
  92 module_platform_driver(dmic_driver);
  93
  94 MODULE_DESCRIPTION("Generic DMIC driver");
  95 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
  96 MODULE_LICENSE("GPL");