2 * AK4104 ALSA SoC (ASoC) driver
4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
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.
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <sound/core.h>
15 #include <sound/soc.h>
16 #include <sound/initval.h>
17 #include <linux/spi/spi.h>
18 #include <sound/asoundef.h>
20 /* AK4104 registers addresses */
21 #define AK4104_REG_CONTROL1 0x00
22 #define AK4104_REG_RESERVED 0x01
23 #define AK4104_REG_CONTROL2 0x02
24 #define AK4104_REG_TX 0x03
25 #define AK4104_REG_CHN_STATUS(x) ((x) + 0x04)
26 #define AK4104_NUM_REGS 10
28 #define AK4104_REG_MASK 0x1f
29 #define AK4104_READ 0xc0
30 #define AK4104_WRITE 0xe0
31 #define AK4104_RESERVED_VAL 0x5b
33 /* Bit masks for AK4104 registers */
34 #define AK4104_CONTROL1_RSTN (1 << 0)
35 #define AK4104_CONTROL1_PW (1 << 1)
36 #define AK4104_CONTROL1_DIF0 (1 << 2)
37 #define AK4104_CONTROL1_DIF1 (1 << 3)
39 #define AK4104_CONTROL2_SEL0 (1 << 0)
40 #define AK4104_CONTROL2_SEL1 (1 << 1)
41 #define AK4104_CONTROL2_MODE (1 << 2)
43 #define AK4104_TX_TXE (1 << 0)
44 #define AK4104_TX_V (1 << 1)
46 #define DRV_NAME "ak4104-codec"
48 struct ak4104_private {
49 enum snd_soc_control_type control_type;
53 static int ak4104_fill_cache(struct snd_soc_codec *codec)
56 u8 *reg_cache = codec->reg_cache;
57 struct spi_device *spi = codec->control_data;
59 for (i = 0; i < codec->driver->reg_cache_size; i++) {
60 int ret = spi_w8r8(spi, i | AK4104_READ);
62 dev_err(&spi->dev, "SPI write failure\n");
72 static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec,
75 u8 *reg_cache = codec->reg_cache;
77 if (reg >= codec->driver->reg_cache_size)
80 return reg_cache[reg];
83 static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,
86 u8 *cache = codec->reg_cache;
87 struct spi_device *spi = codec->control_data;
89 if (reg >= codec->driver->reg_cache_size)
92 /* only write to the hardware if value has changed */
93 if (cache[reg] != value) {
94 u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value };
96 if (spi_write(spi, tmp, sizeof(tmp))) {
97 dev_err(&spi->dev, "SPI write failed\n");
107 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
110 struct snd_soc_codec *codec = codec_dai->codec;
113 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
117 val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1);
120 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
121 case SND_SOC_DAIFMT_RIGHT_J:
123 case SND_SOC_DAIFMT_LEFT_J:
124 val |= AK4104_CONTROL1_DIF0;
126 case SND_SOC_DAIFMT_I2S:
127 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
130 dev_err(codec->dev, "invalid dai format\n");
134 /* This device can only be slave */
135 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
138 return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
141 static int ak4104_hw_params(struct snd_pcm_substream *substream,
142 struct snd_pcm_hw_params *params,
143 struct snd_soc_dai *dai)
145 struct snd_soc_pcm_runtime *rtd = substream->private_data;
146 struct snd_soc_codec *codec = rtd->codec;
149 /* set the IEC958 bits: consumer mode, no copyright bit */
150 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
151 ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val);
155 switch (params_rate(params)) {
157 val |= IEC958_AES3_CON_FS_44100;
160 val |= IEC958_AES3_CON_FS_48000;
163 val |= IEC958_AES3_CON_FS_32000;
166 dev_err(codec->dev, "unsupported sampling rate\n");
170 return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val);
173 static struct snd_soc_dai_ops ak4101_dai_ops = {
174 .hw_params = ak4104_hw_params,
175 .set_fmt = ak4104_set_dai_fmt,
178 static struct snd_soc_dai_driver ak4104_dai = {
179 .name = "ak4104-hifi",
181 .stream_name = "Playback",
184 .rates = SNDRV_PCM_RATE_8000_192000,
185 .formats = SNDRV_PCM_FMTBIT_S16_LE |
186 SNDRV_PCM_FMTBIT_S24_3LE |
187 SNDRV_PCM_FMTBIT_S24_LE
189 .ops = &ak4101_dai_ops,
192 static int ak4104_probe(struct snd_soc_codec *codec)
194 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
197 codec->control_data = ak4104->control_data;
199 /* read all regs and fill the cache */
200 ret = ak4104_fill_cache(codec);
202 dev_err(codec->dev, "failed to fill register cache\n");
206 /* read the 'reserved' register - according to the datasheet, it
207 * should contain 0x5b. Not a good way to verify the presence of
208 * the device, but there is no hardware ID register. */
209 if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) !=
213 /* set power-up and non-reset bits */
214 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
215 val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN;
216 ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
220 /* enable transmitter */
221 val = ak4104_read_reg_cache(codec, AK4104_REG_TX);
222 val |= AK4104_TX_TXE;
223 ret = ak4104_spi_write(codec, AK4104_REG_TX, val);
227 dev_info(codec->dev, "SPI device initialized\n");
231 static int ak4104_remove(struct snd_soc_codec *codec)
235 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
239 /* clear power-up and non-reset bits */
240 val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
241 ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
246 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
247 .probe = ak4104_probe,
248 .remove = ak4104_remove,
249 .reg_cache_size = AK4104_NUM_REGS,
250 .reg_word_size = sizeof(u16),
253 static int ak4104_spi_probe(struct spi_device *spi)
255 struct ak4104_private *ak4104;
258 spi->bits_per_word = 8;
259 spi->mode = SPI_MODE_0;
260 ret = spi_setup(spi);
264 ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL);
268 ak4104->control_data = spi;
269 ak4104->control_type = SND_SOC_SPI;
270 spi_set_drvdata(spi, ak4104);
272 ret = snd_soc_register_codec(&spi->dev,
273 &soc_codec_device_ak4104, &ak4104_dai, 1);
279 static int __devexit ak4104_spi_remove(struct spi_device *spi)
281 snd_soc_unregister_codec(&spi->dev);
282 kfree(spi_get_drvdata(spi));
286 static struct spi_driver ak4104_spi_driver = {
289 .owner = THIS_MODULE,
291 .probe = ak4104_spi_probe,
292 .remove = __devexit_p(ak4104_spi_remove),
295 static int __init ak4104_init(void)
297 pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n");
298 return spi_register_driver(&ak4104_spi_driver);
300 module_init(ak4104_init);
302 static void __exit ak4104_exit(void)
304 spi_unregister_driver(&ak4104_spi_driver);
306 module_exit(ak4104_exit);
308 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
309 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
310 MODULE_LICENSE("GPL");