Linux Kernel  3.7.1
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dmic.c
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1 /*
2  * dmic.c -- SoC audio for Generic Digital MICs
3  *
4  * Author: Liam Girdwood <[email protected]>
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,
37  .formats = SNDRV_PCM_FMTBIT_S32_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));
61 
62  return 0;
63 }
64 
65 static struct snd_soc_codec_driver soc_dmic = {
66  .probe = dmic_probe,
67 };
68 
69 static int __devinit 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 __devexit dmic_dev_remove(struct platform_device *pdev)
76 {
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 = __devexit_p(dmic_dev_remove),
90 };
91 
92 module_platform_driver(dmic_driver);
93 
94 MODULE_DESCRIPTION("Generic DMIC driver");
95 MODULE_AUTHOR("Liam Girdwood <[email protected]>");
96 MODULE_LICENSE("GPL");