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authorDaniel Mack <daniel@caiaq.de>2009-03-08 21:13:17 -0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-03-09 06:46:17 -0400
commita381934e5f9c0c3c292d780d61f5be9c22b2ef54 (patch)
tree48a6b1e05598ee73cbc7f8453bd30b45f084453f /sound/soc
parent055a49b0c92c6282e7db22e9e6ebcae6cb74ebb4 (diff)
ASoC: Add a driver for AK4104 S/PDIF transmitter
This adds a driver for the SPI connected AK4104 S/PDIF transmitter device. Its features are fairly simple, but as there is need to set up certain bits in the IEC958 information, this better goes into a real driver. Signed-off-by: Daniel Mack <daniel@caiaq.de> Cc: Mark Brown <broonie@sirena.org.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc')
-rw-r--r--sound/soc/codecs/Kconfig4
-rw-r--r--sound/soc/codecs/Makefile2
-rw-r--r--sound/soc/codecs/ak4104.c363
-rw-r--r--sound/soc/codecs/ak4104.h7
4 files changed, 376 insertions, 0 deletions
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 628a591c728f..a1af311e7f06 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -14,6 +14,7 @@ config SND_SOC_ALL_CODECS
14 select SND_SOC_AC97_CODEC if SND_SOC_AC97_BUS 14 select SND_SOC_AC97_CODEC if SND_SOC_AC97_BUS
15 select SND_SOC_AD1980 if SND_SOC_AC97_BUS 15 select SND_SOC_AD1980 if SND_SOC_AC97_BUS
16 select SND_SOC_AD73311 if I2C 16 select SND_SOC_AD73311 if I2C
17 select SND_SOC_AK4104 if SPI_MASTER
17 select SND_SOC_AK4535 if I2C 18 select SND_SOC_AK4535 if I2C
18 select SND_SOC_CS4270 if I2C 19 select SND_SOC_CS4270 if I2C
19 select SND_SOC_PCM3008 20 select SND_SOC_PCM3008
@@ -60,6 +61,9 @@ config SND_SOC_AD1980
60config SND_SOC_AD73311 61config SND_SOC_AD73311
61 tristate 62 tristate
62 63
64config SND_SOC_AK4104
65 tristate
66
63config SND_SOC_AK4535 67config SND_SOC_AK4535
64 tristate 68 tristate
65 69
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 3664cdc300b2..4717c3c99040 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -1,6 +1,7 @@
1snd-soc-ac97-objs := ac97.o 1snd-soc-ac97-objs := ac97.o
2snd-soc-ad1980-objs := ad1980.o 2snd-soc-ad1980-objs := ad1980.o
3snd-soc-ad73311-objs := ad73311.o 3snd-soc-ad73311-objs := ad73311.o
4snd-soc-ak4104-objs := ak4104.o
4snd-soc-ak4535-objs := ak4535.o 5snd-soc-ak4535-objs := ak4535.o
5snd-soc-cs4270-objs := cs4270.o 6snd-soc-cs4270-objs := cs4270.o
6snd-soc-l3-objs := l3.o 7snd-soc-l3-objs := l3.o
@@ -30,6 +31,7 @@ snd-soc-wm9713-objs := wm9713.o
30obj-$(CONFIG_SND_SOC_AC97_CODEC) += snd-soc-ac97.o 31obj-$(CONFIG_SND_SOC_AC97_CODEC) += snd-soc-ac97.o
31obj-$(CONFIG_SND_SOC_AD1980) += snd-soc-ad1980.o 32obj-$(CONFIG_SND_SOC_AD1980) += snd-soc-ad1980.o
32obj-$(CONFIG_SND_SOC_AD73311) += snd-soc-ad73311.o 33obj-$(CONFIG_SND_SOC_AD73311) += snd-soc-ad73311.o
34obj-$(CONFIG_SND_SOC_AK4104) += snd-soc-ak4104.o
33obj-$(CONFIG_SND_SOC_AK4535) += snd-soc-ak4535.o 35obj-$(CONFIG_SND_SOC_AK4535) += snd-soc-ak4535.o
34obj-$(CONFIG_SND_SOC_CS4270) += snd-soc-cs4270.o 36obj-$(CONFIG_SND_SOC_CS4270) += snd-soc-cs4270.o
35obj-$(CONFIG_SND_SOC_L3) += snd-soc-l3.o 37obj-$(CONFIG_SND_SOC_L3) += snd-soc-l3.o
diff --git a/sound/soc/codecs/ak4104.c b/sound/soc/codecs/ak4104.c
new file mode 100644
index 000000000000..338381f4fe1e
--- /dev/null
+++ b/sound/soc/codecs/ak4104.c
@@ -0,0 +1,363 @@
1/*
2 * AK4104 ALSA SoC (ASoC) driver
3 *
4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11
12#include <linux/module.h>
13#include <sound/core.h>
14#include <sound/soc.h>
15#include <sound/initval.h>
16#include <linux/spi/spi.h>
17#include <sound/asoundef.h>
18
19#include "ak4104.h"
20
21/* AK4104 registers addresses */
22#define AK4104_REG_CONTROL1 0x00
23#define AK4104_REG_RESERVED 0x01
24#define AK4104_REG_CONTROL2 0x02
25#define AK4104_REG_TX 0x03
26#define AK4104_REG_CHN_STATUS(x) ((x) + 0x04)
27#define AK4104_NUM_REGS 10
28
29#define AK4104_REG_MASK 0x1f
30#define AK4104_READ 0xc0
31#define AK4104_WRITE 0xe0
32#define AK4104_RESERVED_VAL 0x5b
33
34/* Bit masks for AK4104 registers */
35#define AK4104_CONTROL1_RSTN (1 << 0)
36#define AK4104_CONTROL1_PW (1 << 1)
37#define AK4104_CONTROL1_DIF0 (1 << 2)
38#define AK4104_CONTROL1_DIF1 (1 << 3)
39
40#define AK4104_CONTROL2_SEL0 (1 << 0)
41#define AK4104_CONTROL2_SEL1 (1 << 1)
42#define AK4104_CONTROL2_MODE (1 << 2)
43
44#define AK4104_TX_TXE (1 << 0)
45#define AK4104_TX_V (1 << 1)
46
47#define DRV_NAME "ak4104"
48
49struct ak4104_private {
50 struct snd_soc_codec codec;
51 u8 reg_cache[AK4104_NUM_REGS];
52};
53
54static int ak4104_fill_cache(struct snd_soc_codec *codec)
55{
56 int i;
57 u8 *reg_cache = codec->reg_cache;
58 struct spi_device *spi = codec->control_data;
59
60 for (i = 0; i < codec->reg_cache_size; i++) {
61 int ret = spi_w8r8(spi, i | AK4104_READ);
62 if (ret < 0) {
63 dev_err(&spi->dev, "SPI write failure\n");
64 return ret;
65 }
66
67 reg_cache[i] = ret;
68 }
69
70 return 0;
71}
72
73static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec,
74 unsigned int reg)
75{
76 u8 *reg_cache = codec->reg_cache;
77
78 if (reg >= codec->reg_cache_size)
79 return -EINVAL;
80
81 return reg_cache[reg];
82}
83
84static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,
85 unsigned int value)
86{
87 u8 *cache = codec->reg_cache;
88 struct spi_device *spi = codec->control_data;
89
90 if (reg >= codec->reg_cache_size)
91 return -EINVAL;
92
93 reg &= AK4104_REG_MASK;
94 reg |= AK4104_WRITE;
95
96 /* only write to the hardware if value has changed */
97 if (cache[reg] != value) {
98 u8 tmp[2] = { reg, value };
99 if (spi_write(spi, tmp, sizeof(tmp))) {
100 dev_err(&spi->dev, "SPI write failed\n");
101 return -EIO;
102 }
103
104 cache[reg] = value;
105 }
106
107 return 0;
108}
109
110static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
111 unsigned int format)
112{
113 struct snd_soc_codec *codec = codec_dai->codec;
114 int val = 0;
115
116 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
117 if (val < 0)
118 return val;
119
120 val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1);
121
122 /* set DAI format */
123 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
124 case SND_SOC_DAIFMT_RIGHT_J:
125 break;
126 case SND_SOC_DAIFMT_LEFT_J:
127 val |= AK4104_CONTROL1_DIF0;
128 break;
129 case SND_SOC_DAIFMT_I2S:
130 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
131 break;
132 default:
133 dev_err(codec->dev, "invalid dai format\n");
134 return -EINVAL;
135 }
136
137 /* This device can only be slave */
138 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
139 return -EINVAL;
140
141 return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
142}
143
144static int ak4104_hw_params(struct snd_pcm_substream *substream,
145 struct snd_pcm_hw_params *params,
146 struct snd_soc_dai *dai)
147{
148 struct snd_soc_pcm_runtime *rtd = substream->private_data;
149 struct snd_soc_device *socdev = rtd->socdev;
150 struct snd_soc_codec *codec = socdev->card->codec;
151 int val = 0;
152
153 /* set the IEC958 bits: consumer mode, no copyright bit */
154 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
155 ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val);
156
157 val = 0;
158
159 switch (params_rate(params)) {
160 case 44100:
161 val |= IEC958_AES3_CON_FS_44100;
162 break;
163 case 48000:
164 val |= IEC958_AES3_CON_FS_48000;
165 break;
166 case 32000:
167 val |= IEC958_AES3_CON_FS_32000;
168 break;
169 default:
170 dev_err(codec->dev, "unsupported sampling rate\n");
171 return -EINVAL;
172 }
173
174 return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val);
175}
176
177struct snd_soc_dai ak4104_dai = {
178 .name = DRV_NAME,
179 .playback = {
180 .stream_name = "Playback",
181 .channels_min = 2,
182 .channels_max = 2,
183 .rates = SNDRV_PCM_RATE_44100 |
184 SNDRV_PCM_RATE_48000 |
185 SNDRV_PCM_RATE_32000,
186 .formats = SNDRV_PCM_FMTBIT_S16_LE |
187 SNDRV_PCM_FMTBIT_S24_3LE |
188 SNDRV_PCM_FMTBIT_S24_LE
189 },
190 .ops = {
191 .hw_params = ak4104_hw_params,
192 .set_fmt = ak4104_set_dai_fmt,
193 }
194};
195
196static struct snd_soc_codec *ak4104_codec;
197
198static int ak4104_spi_probe(struct spi_device *spi)
199{
200 struct snd_soc_codec *codec;
201 struct ak4104_private *ak4104;
202 int ret, val;
203
204 spi->bits_per_word = 8;
205 spi->mode = SPI_MODE_0;
206 ret = spi_setup(spi);
207 if (ret < 0)
208 return ret;
209
210 ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL);
211 if (!ak4104) {
212 dev_err(&spi->dev, "could not allocate codec\n");
213 return -ENOMEM;
214 }
215
216 codec = &ak4104->codec;
217 mutex_init(&codec->mutex);
218 INIT_LIST_HEAD(&codec->dapm_widgets);
219 INIT_LIST_HEAD(&codec->dapm_paths);
220
221 codec->dev = &spi->dev;
222 codec->name = DRV_NAME;
223 codec->owner = THIS_MODULE;
224 codec->dai = &ak4104_dai;
225 codec->num_dai = 1;
226 codec->private_data = ak4104;
227 codec->control_data = spi;
228 codec->reg_cache = ak4104->reg_cache;
229 codec->reg_cache_size = AK4104_NUM_REGS;
230
231 /* read all regs and fill the cache */
232 ret = ak4104_fill_cache(codec);
233 if (ret < 0) {
234 dev_err(&spi->dev, "failed to fill register cache\n");
235 return ret;
236 }
237
238 /* read the 'reserved' register - according to the datasheet, it
239 * should contain 0x5b. Not a good way to verify the presence of
240 * the device, but there is no hardware ID register. */
241 if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) !=
242 AK4104_RESERVED_VAL) {
243 ret = -ENODEV;
244 goto error_free_codec;
245 }
246
247 /* set power-up and non-reset bits */
248 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
249 val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN;
250 ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
251 if (ret < 0)
252 goto error_free_codec;
253
254 /* enable transmitter */
255 val = ak4104_read_reg_cache(codec, AK4104_REG_TX);
256 val |= AK4104_TX_TXE;
257 ret = ak4104_spi_write(codec, AK4104_REG_TX, val);
258 if (ret < 0)
259 goto error_free_codec;
260
261 ak4104_codec = codec;
262 ret = snd_soc_register_dai(&ak4104_dai);
263 if (ret < 0) {
264 dev_err(&spi->dev, "failed to register DAI\n");
265 goto error_free_codec;
266 }
267
268 spi_set_drvdata(spi, ak4104);
269 dev_info(&spi->dev, "SPI device initialized\n");
270 return 0;
271
272error_free_codec:
273 kfree(ak4104);
274 ak4104_dai.dev = NULL;
275 return ret;
276}
277
278static int __devexit ak4104_spi_remove(struct spi_device *spi)
279{
280 int ret, val;
281 struct ak4104_private *ak4104 = spi_get_drvdata(spi);
282
283 val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1);
284 if (val < 0)
285 return val;
286
287 /* clear power-up and non-reset bits */
288 val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
289 ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val);
290 if (ret < 0)
291 return ret;
292
293 ak4104_codec = NULL;
294 kfree(ak4104);
295 return 0;
296}
297
298static int ak4104_probe(struct platform_device *pdev)
299{
300 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
301 struct snd_soc_codec *codec = ak4104_codec;
302 int ret;
303
304 /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */
305 socdev->card->codec = codec;
306
307 /* Register PCMs */
308 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
309 if (ret < 0) {
310 dev_err(codec->dev, "failed to create pcms\n");
311 return ret;
312 }
313
314 /* Register the socdev */
315 ret = snd_soc_init_card(socdev);
316 if (ret < 0) {
317 dev_err(codec->dev, "failed to register card\n");
318 snd_soc_free_pcms(socdev);
319 return ret;
320 }
321
322 return 0;
323}
324
325static int ak4104_remove(struct platform_device *pdev)
326{
327 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
328 snd_soc_free_pcms(socdev);
329 return 0;
330};
331
332struct snd_soc_codec_device soc_codec_device_ak4104 = {
333 .probe = ak4104_probe,
334 .remove = ak4104_remove
335};
336EXPORT_SYMBOL_GPL(soc_codec_device_ak4104);
337
338static struct spi_driver ak4104_spi_driver = {
339 .driver = {
340 .name = DRV_NAME,
341 .owner = THIS_MODULE,
342 },
343 .probe = ak4104_spi_probe,
344 .remove = __devexit_p(ak4104_spi_remove),
345};
346
347static int __init ak4104_init(void)
348{
349 pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n");
350 return spi_register_driver(&ak4104_spi_driver);
351}
352module_init(ak4104_init);
353
354static void __exit ak4104_exit(void)
355{
356 spi_unregister_driver(&ak4104_spi_driver);
357}
358module_exit(ak4104_exit);
359
360MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
361MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
362MODULE_LICENSE("GPL");
363
diff --git a/sound/soc/codecs/ak4104.h b/sound/soc/codecs/ak4104.h
new file mode 100644
index 000000000000..eb88fe7e4def
--- /dev/null
+++ b/sound/soc/codecs/ak4104.h
@@ -0,0 +1,7 @@
1#ifndef _AK4104_H
2#define _AK4104_H
3
4extern struct snd_soc_dai ak4104_dai;
5extern struct snd_soc_codec_device soc_codec_device_ak4104;
6
7#endif