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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
/*
* Driver for the 1250-EV1 audio I/O module
*
* Copyright 2011 Wolfson Microelectronics plc
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/wm1250-ev1.h>
static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
"WM1250 CLK_ENA",
"WM1250 CLK_SEL0",
"WM1250 CLK_SEL1",
"WM1250 OSR",
"WM1250 MASTER",
};
struct wm1250_priv {
struct gpio gpios[WM1250_EV1_NUM_GPIOS];
};
static int wm1250_ev1_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
struct wm1250_priv *wm1250 = dev_get_drvdata(codec->dev);
int ena;
if (wm1250)
ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
else
ena = -1;
switch (level) {
case SND_SOC_BIAS_ON:
break;
case SND_SOC_BIAS_PREPARE:
break;
case SND_SOC_BIAS_STANDBY:
if (ena >= 0)
gpio_set_value_cansleep(ena, 1);
break;
case SND_SOC_BIAS_OFF:
if (ena >= 0)
gpio_set_value_cansleep(ena, 0);
break;
}
codec->dapm.bias_level = level;
return 0;
}
static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_INPUT("WM1250 Input"),
SND_SOC_DAPM_OUTPUT("WM1250 Output"),
};
static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
{ "ADC", NULL, "WM1250 Input" },
{ "WM1250 Output", NULL, "DAC" },
};
static struct snd_soc_dai_driver wm1250_ev1_dai = {
.name = "wm1250-ev1",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 1,
.rates = SNDRV_PCM_RATE_8000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 1,
.rates = SNDRV_PCM_RATE_8000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
};
static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
.dapm_widgets = wm1250_ev1_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
.dapm_routes = wm1250_ev1_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),
.set_bias_level = wm1250_ev1_set_bias_level,
.idle_bias_off = true,
};
static int __devinit wm1250_ev1_pdata(struct i2c_client *i2c)
{
struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
struct wm1250_priv *wm1250;
int i, ret;
if (!pdata)
return 0;
wm1250 = kzalloc(sizeof(*wm1250), GFP_KERNEL);
if (!wm1250) {
dev_err(&i2c->dev, "Unable to allocate private data\n");
ret = -ENOMEM;
goto err;
}
for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
wm1250->gpios[i].gpio = pdata->gpios[i];
wm1250->gpios[i].label = wm1250_gpio_names[i];
wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
}
wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;
ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
if (ret != 0) {
dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
goto err_alloc;
}
dev_set_drvdata(&i2c->dev, wm1250);
return ret;
err_alloc:
kfree(wm1250);
err:
return ret;
}
static void wm1250_ev1_free(struct i2c_client *i2c)
{
struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);
if (wm1250) {
gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
kfree(wm1250);
}
}
static int __devinit wm1250_ev1_probe(struct i2c_client *i2c,
const struct i2c_device_id *i2c_id)
{
int id, board, rev, ret;
dev_set_drvdata(&i2c->dev, NULL);
board = i2c_smbus_read_byte_data(i2c, 0);
if (board < 0) {
dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
return board;
}
id = (board & 0xfe) >> 2;
rev = board & 0x3;
if (id != 1) {
dev_err(&i2c->dev, "Unknown board ID %d\n", id);
return -ENODEV;
}
dev_info(&i2c->dev, "revision %d\n", rev + 1);
ret = wm1250_ev1_pdata(i2c);
if (ret != 0)
return ret;
ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
&wm1250_ev1_dai, 1);
if (ret != 0) {
dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
wm1250_ev1_free(i2c);
return ret;
}
return 0;
}
static int __devexit wm1250_ev1_remove(struct i2c_client *i2c)
{
snd_soc_unregister_codec(&i2c->dev);
wm1250_ev1_free(i2c);
return 0;
}
static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
{ "wm1250-ev1", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);
static struct i2c_driver wm1250_ev1_i2c_driver = {
.driver = {
.name = "wm1250-ev1",
.owner = THIS_MODULE,
},
.probe = wm1250_ev1_probe,
.remove = __devexit_p(wm1250_ev1_remove),
.id_table = wm1250_ev1_i2c_id,
};
static int __init wm1250_ev1_modinit(void)
{
int ret = 0;
ret = i2c_add_driver(&wm1250_ev1_i2c_driver);
if (ret != 0)
pr_err("Failed to register WM1250-EV1 I2C driver: %d\n", ret);
return ret;
}
module_init(wm1250_ev1_modinit);
static void __exit wm1250_ev1_exit(void)
{
i2c_del_driver(&wm1250_ev1_i2c_driver);
}
module_exit(wm1250_ev1_exit);
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
MODULE_LICENSE("GPL");
|
