ak5386.c
4.14 KB
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
165
166
167
/*
* ALSA SoC driver for
* Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
*
* (c) 2013 Daniel Mack <zonque@gmail.com>
*
* 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.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>
#include <sound/soc.h>
#include <sound/pcm.h>
#include <sound/initval.h>
struct ak5386_priv {
int reset_gpio;
};
static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("AINL"),
SND_SOC_DAPM_INPUT("AINR"),
};
static const struct snd_soc_dapm_route ak5386_dapm_routes[] = {
{ "Capture", NULL, "AINL" },
{ "Capture", NULL, "AINR" },
};
static struct snd_soc_codec_driver soc_codec_ak5386 = {
.dapm_widgets = ak5386_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets),
.dapm_routes = ak5386_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes),
};
static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int format)
{
struct snd_soc_codec *codec = codec_dai->codec;
format &= SND_SOC_DAIFMT_FORMAT_MASK;
if (format != SND_SOC_DAIFMT_LEFT_J &&
format != SND_SOC_DAIFMT_I2S) {
dev_err(codec->dev, "Invalid DAI format\n");
return -EINVAL;
}
return 0;
}
static int ak5386_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
/*
* From the datasheet:
*
* All external clocks (MCLK, SCLK and LRCK) must be present unless
* PDN pin = “L”. If these clocks are not provided, the AK5386 may
* draw excess current due to its use of internal dynamically
* refreshed logic. If the external clocks are not present, place
* the AK5386 in power-down mode (PDN pin = “L”).
*/
if (gpio_is_valid(priv->reset_gpio))
gpio_set_value(priv->reset_gpio, 1);
return 0;
}
static int ak5386_hw_free(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
if (gpio_is_valid(priv->reset_gpio))
gpio_set_value(priv->reset_gpio, 0);
return 0;
}
static const struct snd_soc_dai_ops ak5386_dai_ops = {
.set_fmt = ak5386_set_dai_fmt,
.hw_params = ak5386_hw_params,
.hw_free = ak5386_hw_free,
};
static struct snd_soc_dai_driver ak5386_dai = {
.name = "ak5386-hifi",
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S8 |
SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S24_LE |
SNDRV_PCM_FMTBIT_S24_3LE,
},
.ops = &ak5386_dai_ops,
};
#ifdef CONFIG_OF
static const struct of_device_id ak5386_dt_ids[] = {
{ .compatible = "asahi-kasei,ak5386", },
{ }
};
MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
#endif
static int ak5386_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ak5386_priv *priv;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->reset_gpio = -EINVAL;
dev_set_drvdata(dev, priv);
if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
priv->reset_gpio = of_get_named_gpio(dev->of_node,
"reset-gpio", 0);
if (gpio_is_valid(priv->reset_gpio))
if (devm_gpio_request_one(dev, priv->reset_gpio,
GPIOF_OUT_INIT_LOW,
"AK5386 Reset"))
priv->reset_gpio = -EINVAL;
return snd_soc_register_codec(dev, &soc_codec_ak5386,
&ak5386_dai, 1);
}
static int ak5386_remove(struct platform_device *pdev)
{
snd_soc_unregister_codec(&pdev->dev);
return 0;
}
static struct platform_driver ak5386_driver = {
.probe = ak5386_probe,
.remove = ak5386_remove,
.driver = {
.name = "ak5386",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(ak5386_dt_ids),
},
};
module_platform_driver(ak5386_driver);
MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
MODULE_LICENSE("GPL");