dmic.c (2ac5e38ea4203852d6e99edd3cf11f044b0a409f) dmic.c (bc0a7dbc5a54a06b925064adba8b07d65acf8718)
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.

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25#include <linux/platform_device.h>
26#include <linux/slab.h>
27#include <linux/module.h>
28#include <sound/core.h>
29#include <sound/pcm.h>
30#include <sound/soc.h>
31#include <sound/soc-dapm.h>
32
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.

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25#include <linux/platform_device.h>
26#include <linux/slab.h>
27#include <linux/module.h>
28#include <sound/core.h>
29#include <sound/pcm.h>
30#include <sound/soc.h>
31#include <sound/soc-dapm.h>
32
33#define MAX_MODESWITCH_DELAY 70
34static int modeswitch_delay;
35module_param(modeswitch_delay, uint, 0644);
36
33struct dmic {
34 struct gpio_desc *gpio_en;
35 int wakeup_delay;
37struct dmic {
38 struct gpio_desc *gpio_en;
39 int wakeup_delay;
40 /* Delay after DMIC mode switch */
41 int modeswitch_delay;
36};
37
42};
43
44int dmic_daiops_trigger(struct snd_pcm_substream *substream,
45 int cmd, struct snd_soc_dai *dai)
46{
47 struct snd_soc_component *component = dai->component;
48 struct dmic *dmic = snd_soc_component_get_drvdata(component);
49
50 switch (cmd) {
51 case SNDRV_PCM_TRIGGER_STOP:
52 if (dmic->modeswitch_delay)
53 mdelay(dmic->modeswitch_delay);
54
55 break;
56 }
57
58 return 0;
59}
60
61static const struct snd_soc_dai_ops dmic_dai_ops = {
62 .trigger = dmic_daiops_trigger,
63};
64
38static int dmic_aif_event(struct snd_soc_dapm_widget *w,
39 struct snd_kcontrol *kcontrol, int event) {
40 struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
41 struct dmic *dmic = snd_soc_component_get_drvdata(component);
42
43 switch (event) {
44 case SND_SOC_DAPM_POST_PMU:
45 if (dmic->gpio_en)

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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,
70 },
65static int dmic_aif_event(struct snd_soc_dapm_widget *w,
66 struct snd_kcontrol *kcontrol, int event) {
67 struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
68 struct dmic *dmic = snd_soc_component_get_drvdata(component);
69
70 switch (event) {
71 case SND_SOC_DAPM_POST_PMU:
72 if (dmic->gpio_en)

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90 .stream_name = "Capture",
91 .channels_min = 1,
92 .channels_max = 8,
93 .rates = SNDRV_PCM_RATE_CONTINUOUS,
94 .formats = SNDRV_PCM_FMTBIT_S32_LE
95 | SNDRV_PCM_FMTBIT_S24_LE
96 | SNDRV_PCM_FMTBIT_S16_LE,
97 },
98 .ops = &dmic_dai_ops,
71};
72
73static int dmic_component_probe(struct snd_soc_component *component)
74{
75 struct dmic *dmic;
76
77 dmic = devm_kzalloc(component->dev, sizeof(*dmic), GFP_KERNEL);
78 if (!dmic)
79 return -ENOMEM;
80
81 dmic->gpio_en = devm_gpiod_get_optional(component->dev,
82 "dmicen", GPIOD_OUT_LOW);
83 if (IS_ERR(dmic->gpio_en))
84 return PTR_ERR(dmic->gpio_en);
85
86 device_property_read_u32(component->dev, "wakeup-delay-ms",
87 &dmic->wakeup_delay);
99};
100
101static int dmic_component_probe(struct snd_soc_component *component)
102{
103 struct dmic *dmic;
104
105 dmic = devm_kzalloc(component->dev, sizeof(*dmic), GFP_KERNEL);
106 if (!dmic)
107 return -ENOMEM;
108
109 dmic->gpio_en = devm_gpiod_get_optional(component->dev,
110 "dmicen", GPIOD_OUT_LOW);
111 if (IS_ERR(dmic->gpio_en))
112 return PTR_ERR(dmic->gpio_en);
113
114 device_property_read_u32(component->dev, "wakeup-delay-ms",
115 &dmic->wakeup_delay);
116 device_property_read_u32(component->dev, "modeswitch-delay-ms",
117 &dmic->modeswitch_delay);
118 if (modeswitch_delay)
119 dmic->modeswitch_delay = modeswitch_delay;
88
120
121 if (dmic->modeswitch_delay > MAX_MODESWITCH_DELAY)
122 dmic->modeswitch_delay = MAX_MODESWITCH_DELAY;
123
89 snd_soc_component_set_drvdata(component, dmic);
90
91 return 0;
92}
93
94static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
95 SND_SOC_DAPM_AIF_OUT_E("DMIC AIF", "Capture", 0,
96 SND_SOC_NOPM, 0, 0, dmic_aif_event,

--- 69 unchanged lines hidden --- 		124 snd_soc_component_set_drvdata(component, dmic);
125
126 return 0;
127}
128
129static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
130 SND_SOC_DAPM_AIF_OUT_E("DMIC AIF", "Capture", 0,
131 SND_SOC_NOPM, 0, 0, dmic_aif_event,

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