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
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);
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);
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);
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 = {
63 .stream_name = "Capture",
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,
74 static int dmic_component_probe(struct snd_soc_component *component)
76 struct gpio_desc *dmic_en;
78 dmic_en = devm_gpiod_get_optional(component->dev,
79 "dmicen", GPIOD_OUT_LOW);
81 return PTR_ERR(dmic_en);
83 snd_soc_component_set_drvdata(component, dmic_en);
88 static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
89 SND_SOC_DAPM_AIF_OUT("DMIC AIF", "Capture", 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_component_driver soc_dmic = {
99 .probe = dmic_component_probe,
100 .dapm_widgets = dmic_dapm_widgets,
101 .num_dapm_widgets = ARRAY_SIZE(dmic_dapm_widgets),
102 .dapm_routes = intercon,
103 .num_dapm_routes = ARRAY_SIZE(intercon),
105 .use_pmdown_time = 1,
107 .non_legacy_dai_naming = 1,
110 static int dmic_dev_probe(struct platform_device *pdev)
114 struct snd_soc_dai_driver *dai_drv = &dmic_dai;
116 if (pdev->dev.of_node) {
117 err = of_property_read_u32(pdev->dev.of_node, "num-channels", &chans);
118 if (err && (err != -EINVAL))
122 if (chans < 1 || chans > 8)
125 dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL);
129 memcpy(dai_drv, &dmic_dai, sizeof(*dai_drv));
130 dai_drv->capture.channels_max = chans;
134 return devm_snd_soc_register_component(&pdev->dev,
135 &soc_dmic, dai_drv, 1);
138 MODULE_ALIAS("platform:dmic-codec");
140 static const struct of_device_id dmic_dev_match[] = {
141 {.compatible = "dmic-codec"},
145 static struct platform_driver dmic_driver = {
147 .name = "dmic-codec",
148 .of_match_table = dmic_dev_match,
150 .probe = dmic_dev_probe,
153 module_platform_driver(dmic_driver);
155 MODULE_DESCRIPTION("Generic DMIC driver");
156 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
157 MODULE_LICENSE("GPL");