x86/speculation/mds: Fix documentation typo
[linux/fpc-iii.git] / sound / soc / codecs / dmic.c
blobb88a1ee66f80135b55e7c211e4794a46e202232c
1 /*
2 * dmic.c -- SoC audio for Generic Digital MICs
4 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
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.
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.
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
22 #include <linux/gpio.h>
23 #include <linux/gpio/consumer.h>
24 #include <linux/platform_device.h>
25 #include <linux/slab.h>
26 #include <linux/module.h>
27 #include <sound/core.h>
28 #include <sound/pcm.h>
29 #include <sound/soc.h>
30 #include <sound/soc-dapm.h>
32 static int dmic_daiops_trigger(struct snd_pcm_substream *substream,
33 int cmd, struct snd_soc_dai *dai)
35 struct gpio_desc *dmic_en = snd_soc_dai_get_drvdata(dai);
37 if (!dmic_en)
38 return 0;
40 switch (cmd) {
41 case SNDRV_PCM_TRIGGER_START:
42 case SNDRV_PCM_TRIGGER_RESUME:
43 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
44 gpiod_set_value(dmic_en, 1);
45 break;
46 case SNDRV_PCM_TRIGGER_STOP:
47 case SNDRV_PCM_TRIGGER_SUSPEND:
48 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
49 gpiod_set_value(dmic_en, 0);
50 break;
53 return 0;
56 static const struct snd_soc_dai_ops dmic_dai_ops = {
57 .trigger = dmic_daiops_trigger,
60 static struct snd_soc_dai_driver dmic_dai = {
61 .name = "dmic-hifi",
62 .capture = {
63 .stream_name = "Capture",
64 .channels_min = 1,
65 .channels_max = 8,
66 .rates = SNDRV_PCM_RATE_CONTINUOUS,
67 .formats = SNDRV_PCM_FMTBIT_S32_LE
68 | SNDRV_PCM_FMTBIT_S24_LE
69 | SNDRV_PCM_FMTBIT_S16_LE,
71 .ops = &dmic_dai_ops,
74 static int dmic_codec_probe(struct snd_soc_codec *codec)
76 struct gpio_desc *dmic_en;
78 dmic_en = devm_gpiod_get_optional(codec->dev,
79 "dmicen", GPIOD_OUT_LOW);
80 if (IS_ERR(dmic_en))
81 return PTR_ERR(dmic_en);
83 snd_soc_codec_set_drvdata(codec, dmic_en);
85 return 0;
88 static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
89 SND_SOC_DAPM_AIF_OUT("DMIC AIF", "Capture", 0,
90 SND_SOC_NOPM, 0, 0),
91 SND_SOC_DAPM_INPUT("DMic"),
94 static const struct snd_soc_dapm_route intercon[] = {
95 {"DMIC AIF", NULL, "DMic"},
98 static const struct snd_soc_codec_driver soc_dmic = {
99 .probe = dmic_codec_probe,
100 .component_driver = {
101 .dapm_widgets = dmic_dapm_widgets,
102 .num_dapm_widgets = ARRAY_SIZE(dmic_dapm_widgets),
103 .dapm_routes = intercon,
104 .num_dapm_routes = ARRAY_SIZE(intercon),
108 static int dmic_dev_probe(struct platform_device *pdev)
110 return snd_soc_register_codec(&pdev->dev,
111 &soc_dmic, &dmic_dai, 1);
114 static int dmic_dev_remove(struct platform_device *pdev)
116 snd_soc_unregister_codec(&pdev->dev);
117 return 0;
120 MODULE_ALIAS("platform:dmic-codec");
122 static const struct of_device_id dmic_dev_match[] = {
123 {.compatible = "dmic-codec"},
127 static struct platform_driver dmic_driver = {
128 .driver = {
129 .name = "dmic-codec",
130 .of_match_table = dmic_dev_match,
132 .probe = dmic_dev_probe,
133 .remove = dmic_dev_remove,
136 module_platform_driver(dmic_driver);
138 MODULE_DESCRIPTION("Generic DMIC driver");
139 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
140 MODULE_LICENSE("GPL");