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
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
|
/*
* AK4104 ALSA SoC (ASoC) driver
*
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
*
* 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/module.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <linux/spi/spi.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <sound/asoundef.h>
/* AK4104 registers addresses */
#define AK4104_REG_CONTROL1 0x00
#define AK4104_REG_RESERVED 0x01
#define AK4104_REG_CONTROL2 0x02
#define AK4104_REG_TX 0x03
#define AK4104_REG_CHN_STATUS(x) ((x) + 0x04)
#define AK4104_NUM_REGS 10
#define AK4104_REG_MASK 0x1f
#define AK4104_READ 0xc0
#define AK4104_WRITE 0xe0
#define AK4104_RESERVED_VAL 0x5b
/* Bit masks for AK4104 registers */
#define AK4104_CONTROL1_RSTN (1 << 0)
#define AK4104_CONTROL1_PW (1 << 1)
#define AK4104_CONTROL1_DIF0 (1 << 2)
#define AK4104_CONTROL1_DIF1 (1 << 3)
#define AK4104_CONTROL2_SEL0 (1 << 0)
#define AK4104_CONTROL2_SEL1 (1 << 1)
#define AK4104_CONTROL2_MODE (1 << 2)
#define AK4104_TX_TXE (1 << 0)
#define AK4104_TX_V (1 << 1)
#define DRV_NAME "ak4104-codec"
struct ak4104_private {
struct regmap *regmap;
};
static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
unsigned int format)
{
struct snd_soc_codec *codec = codec_dai->codec;
int val = 0;
int ret;
/* set DAI format */
switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_RIGHT_J:
break;
case SND_SOC_DAIFMT_LEFT_J:
val |= AK4104_CONTROL1_DIF0;
break;
case SND_SOC_DAIFMT_I2S:
val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
break;
default:
dev_err(codec->dev, "invalid dai format\n");
return -EINVAL;
}
/* This device can only be slave */
if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
return -EINVAL;
ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
val);
if (ret < 0)
return ret;
return 0;
}
static int ak4104_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;
int val = 0;
/* set the IEC958 bits: consumer mode, no copyright bit */
val |= IEC958_AES0_CON_NOT_COPYRIGHT;
snd_soc_write(codec, AK4104_REG_CHN_STATUS(0), val);
val = 0;
switch (params_rate(params)) {
case 22050:
val |= IEC958_AES3_CON_FS_22050;
break;
case 24000:
val |= IEC958_AES3_CON_FS_24000;
break;
case 32000:
val |= IEC958_AES3_CON_FS_32000;
break;
case 44100:
val |= IEC958_AES3_CON_FS_44100;
break;
case 48000:
val |= IEC958_AES3_CON_FS_48000;
break;
case 88200:
val |= IEC958_AES3_CON_FS_88200;
break;
case 96000:
val |= IEC958_AES3_CON_FS_96000;
break;
case 176400:
val |= IEC958_AES3_CON_FS_176400;
break;
case 192000:
val |= IEC958_AES3_CON_FS_192000;
break;
default:
dev_err(codec->dev, "unsupported sampling rate\n");
return -EINVAL;
}
return snd_soc_write(codec, AK4104_REG_CHN_STATUS(3), val);
}
static const struct snd_soc_dai_ops ak4101_dai_ops = {
.hw_params = ak4104_hw_params,
.set_fmt = ak4104_set_dai_fmt,
};
static struct snd_soc_dai_driver ak4104_dai = {
.name = "ak4104-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S24_3LE |
SNDRV_PCM_FMTBIT_S24_LE
},
.ops = &ak4101_dai_ops,
};
static int ak4104_probe(struct snd_soc_codec *codec)
{
struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
int ret;
codec->control_data = ak4104->regmap;
ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP);
if (ret != 0)
return ret;
/* set power-up and non-reset bits */
ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
if (ret < 0)
return ret;
/* enable transmitter */
ret = snd_soc_update_bits(codec, AK4104_REG_TX,
AK4104_TX_TXE, AK4104_TX_TXE);
if (ret < 0)
return ret;
return 0;
}
static int ak4104_remove(struct snd_soc_codec *codec)
{
snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
return 0;
}
static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
.probe = ak4104_probe,
.remove = ak4104_remove,
};
static const struct regmap_config ak4104_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = AK4104_NUM_REGS - 1,
.read_flag_mask = AK4104_READ,
.write_flag_mask = AK4104_WRITE,
.cache_type = REGCACHE_RBTREE,
};
static int ak4104_spi_probe(struct spi_device *spi)
{
struct device_node *np = spi->dev.of_node;
struct ak4104_private *ak4104;
unsigned int val;
int ret;
spi->bits_per_word = 8;
spi->mode = SPI_MODE_0;
ret = spi_setup(spi);
if (ret < 0)
return ret;
ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
GFP_KERNEL);
if (ak4104 == NULL)
return -ENOMEM;
ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
if (IS_ERR(ak4104->regmap)) {
ret = PTR_ERR(ak4104->regmap);
return ret;
}
if (np) {
enum of_gpio_flags flags;
int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
if (gpio_is_valid(gpio)) {
ret = devm_gpio_request_one(&spi->dev, gpio,
flags & OF_GPIO_ACTIVE_LOW ?
GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
"ak4104 reset");
if (ret < 0)
return ret;
}
}
/* read the 'reserved' register - according to the datasheet, it
* should contain 0x5b. Not a good way to verify the presence of
* the device, but there is no hardware ID register. */
ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
if (ret != 0)
return ret;
if (val != AK4104_RESERVED_VAL)
return -ENODEV;
spi_set_drvdata(spi, ak4104);
ret = snd_soc_register_codec(&spi->dev,
&soc_codec_device_ak4104, &ak4104_dai, 1);
return ret;
}
static int __devexit ak4104_spi_remove(struct spi_device *spi)
{
snd_soc_unregister_codec(&spi->dev);
return 0;
}
static const struct of_device_id ak4104_of_match[] = {
{ .compatible = "asahi-kasei,ak4104", },
{ }
};
MODULE_DEVICE_TABLE(of, ak4104_of_match);
static struct spi_driver ak4104_spi_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
.of_match_table = ak4104_of_match,
},
.probe = ak4104_spi_probe,
.remove = __devexit_p(ak4104_spi_remove),
};
module_spi_driver(ak4104_spi_driver);
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
MODULE_LICENSE("GPL");
|
