1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*
* dmic.c -- SoC audio for Generic Digital MICs
*
* Author: Liam Girdwood <lrg@slimlogic.co.uk>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
struct dmic {
struct gpio_desc *gpio_en;
int wakeup_delay;
};
static int dmic_aif_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event) {
struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
struct dmic *dmic = snd_soc_codec_get_drvdata(codec);
switch (event) {
case SND_SOC_DAPM_POST_PMU:
if (dmic->gpio_en)
gpiod_set_value(dmic->gpio_en, 1);
if (dmic->wakeup_delay)
msleep(dmic->wakeup_delay);
break;
case SND_SOC_DAPM_POST_PMD:
if (dmic->gpio_en)
gpiod_set_value(dmic->gpio_en, 0);
break;
}
return 0;
}
static struct snd_soc_dai_driver dmic_dai = {
.name = "dmic-hifi",
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 8,
.rates = SNDRV_PCM_RATE_CONTINUOUS,
.formats = SNDRV_PCM_FMTBIT_S32_LE
| SNDRV_PCM_FMTBIT_S24_LE
| SNDRV_PCM_FMTBIT_S16_LE,
},
};
static int dmic_component_probe(struct snd_soc_component *component)
{
struct dmic *dmic;
dmic = devm_kzalloc(component->dev, sizeof(*dmic), GFP_KERNEL);
if (!dmic)
return -ENOMEM;
dmic->gpio_en = devm_gpiod_get_optional(component->dev,
"dmicen", GPIOD_OUT_LOW);
if (IS_ERR(dmic->gpio_en))
return PTR_ERR(dmic->gpio_en);
device_property_read_u32(component->dev, "wakeup-delay-ms",
&dmic->wakeup_delay);
snd_soc_component_set_drvdata(component, dmic);
return 0;
}
static const struct snd_soc_dapm_widget dmic_dapm_widgets[] = {
SND_SOC_DAPM_AIF_OUT_E("DMIC AIF", "Capture", 0,
SND_SOC_NOPM, 0, 0, dmic_aif_event,
SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
SND_SOC_DAPM_INPUT("DMic"),
};
static const struct snd_soc_dapm_route intercon[] = {
{"DMIC AIF", NULL, "DMic"},
};
static const struct snd_soc_component_driver soc_dmic = {
.probe = dmic_component_probe,
.dapm_widgets = dmic_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(dmic_dapm_widgets),
.dapm_routes = intercon,
.num_dapm_routes = ARRAY_SIZE(intercon),
.idle_bias_on = 1,
.use_pmdown_time = 1,
.endianness = 1,
.non_legacy_dai_naming = 1,
};
static int dmic_dev_probe(struct platform_device *pdev)
{
int err;
u32 chans;
struct snd_soc_dai_driver *dai_drv = &dmic_dai;
if (pdev->dev.of_node) {
err = of_property_read_u32(pdev->dev.of_node, "num-channels", &chans);
if (err && (err != -EINVAL))
return err;
if (!err) {
if (chans < 1 || chans > 8)
return -EINVAL;
dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL);
if (!dai_drv)
return -ENOMEM;
memcpy(dai_drv, &dmic_dai, sizeof(*dai_drv));
dai_drv->capture.channels_max = chans;
}
}
return devm_snd_soc_register_component(&pdev->dev,
&soc_dmic, dai_drv, 1);
}
MODULE_ALIAS("platform:dmic-codec");
static const struct of_device_id dmic_dev_match[] = {
{.compatible = "dmic-codec"},
{}
};
static struct platform_driver dmic_driver = {
.driver = {
.name = "dmic-codec",
.of_match_table = dmic_dev_match,
},
.probe = dmic_dev_probe,
};
module_platform_driver(dmic_driver);
MODULE_DESCRIPTION("Generic DMIC driver");
MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
MODULE_LICENSE("GPL");
|
