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 <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/soc.h>
  27 #include <sound/soc-dapm.h>
  28
  29 static struct snd_soc_dai_driver dmic_dai = {
  30         .name = "dmic-hifi",
  31         .capture = {
  32                 .stream_name = "Capture",
  33                 .channels_min = 1,
  34                 .channels_max = 8,
  35                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
  36                 .formats = SNDRV_PCM_FMTBIT_S32_LE
  37                         | SNDRV_PCM_FMTBIT_S24_LE
  38                         | SNDRV_PCM_FMTBIT_S16_LE,
  39         },
  40 };
  41
  42 static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
  43         SND_SOC_DAPM_AIF_OUT("DMIC AIF", "Capture", 0,
  44                              SND_SOC_NOPM, 0, 0),
  45         SND_SOC_DAPM_INPUT("DMic"),
  46 };
  47
  48 static const struct snd_soc_dapm_route intercon[] = {
  49         {"DMIC AIF", NULL, "DMic"},
  50 };
  51
  52 static int dmic_probe(struct snd_soc_codec *codec)
  53 {
  54         struct snd_soc_dapm_context *dapm = &codec->dapm;
  55
  56         snd_soc_dapm_new_controls(dapm, dmic_dapm_widgets,
  57                                   ARRAY_SIZE(dmic_dapm_widgets));
  58         snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
  59         snd_soc_dapm_new_widgets(dapm);
  60
  61         return 0;
  62 }
  63
  64 static struct snd_soc_codec_driver soc_dmic = {
  65         .probe  = dmic_probe,
  66 };
  67
  68 static int __devinit dmic_dev_probe(struct platform_device *pdev)
  69 {
  70         return snd_soc_register_codec(&pdev->dev,
  71                         &soc_dmic, &dmic_dai, 1);
  72 }
  73
  74 static int __devexit dmic_dev_remove(struct platform_device *pdev)
  75 {
  76         snd_soc_unregister_codec(&pdev->dev);
  77         return 0;
  78 }
  79
  80 MODULE_ALIAS("platform:dmic-codec");
  81
  82 static struct platform_driver dmic_driver = {
  83         .driver = {
  84                 .name = "dmic-codec",
  85                 .owner = THIS_MODULE,
  86         },
  87         .probe = dmic_dev_probe,
  88         .remove = __devexit_p(dmic_dev_remove),
  89 };
  90
  91 static int __init dmic_init(void)
  92 {
  93         return platform_driver_register(&dmic_driver);
  94 }
  95 module_init(dmic_init);
  96
  97 static void __exit dmic_exit(void)
  98 {
  99         platform_driver_unregister(&dmic_driver);
 100 }
 101 module_exit(dmic_exit);
 102
 103 MODULE_DESCRIPTION("Generic DMIC driver");
 104 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
 105 MODULE_LICENSE("GPL");