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 struct regmap *regmap;
52 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
55 struct snd_soc_codec *codec = codec_dai->codec;
60 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
61 case SND_SOC_DAIFMT_RIGHT_J:
63 case SND_SOC_DAIFMT_LEFT_J:
64 val |= AK4104_CONTROL1_DIF0;
66 case SND_SOC_DAIFMT_I2S:
67 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
70 dev_err(codec->dev, "invalid dai format\n");
74 /* This device can only be slave */
75 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
78 ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
79 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
87 static int ak4104_hw_params(struct snd_pcm_substream *substream,
88 struct snd_pcm_hw_params *params,
89 struct snd_soc_dai *dai)
91 struct snd_soc_codec *codec = dai->codec;
94 /* set the IEC958 bits: consumer mode, no copyright bit */
95 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
96 snd_soc_write(codec, AK4104_REG_CHN_STATUS(0), val);
100 switch (params_rate(params)) {
102 val |= IEC958_AES3_CON_FS_44100;
105 val |= IEC958_AES3_CON_FS_48000;
108 val |= IEC958_AES3_CON_FS_32000;
111 dev_err(codec->dev, "unsupported sampling rate\n");
115 return snd_soc_write(codec, AK4104_REG_CHN_STATUS(3), val);
118 static const struct snd_soc_dai_ops ak4101_dai_ops = {
119 .hw_params = ak4104_hw_params,
120 .set_fmt = ak4104_set_dai_fmt,
123 static struct snd_soc_dai_driver ak4104_dai = {
124 .name = "ak4104-hifi",
126 .stream_name = "Playback",
129 .rates = SNDRV_PCM_RATE_8000_192000,
130 .formats = SNDRV_PCM_FMTBIT_S16_LE |
131 SNDRV_PCM_FMTBIT_S24_3LE |
132 SNDRV_PCM_FMTBIT_S24_LE
134 .ops = &ak4101_dai_ops,
137 static int ak4104_probe(struct snd_soc_codec *codec)
139 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
142 codec->control_data = ak4104->regmap;
143 ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP);
147 /* set power-up and non-reset bits */
148 ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
149 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
150 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
154 /* enable transmitter */
155 ret = snd_soc_update_bits(codec, AK4104_REG_TX,
156 AK4104_TX_TXE, AK4104_TX_TXE);
163 static int ak4104_remove(struct snd_soc_codec *codec)
165 snd_soc_update_bits(codec, AK4104_REG_CONTROL1,
166 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
171 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
172 .probe = ak4104_probe,
173 .remove = ak4104_remove,
176 static const struct regmap_config ak4104_regmap = {
180 .max_register = AK4104_NUM_REGS - 1,
181 .read_flag_mask = AK4104_READ,
182 .write_flag_mask = AK4104_WRITE,
184 .cache_type = REGCACHE_RBTREE,
187 static int ak4104_spi_probe(struct spi_device *spi)
189 struct ak4104_private *ak4104;
193 spi->bits_per_word = 8;
194 spi->mode = SPI_MODE_0;
195 ret = spi_setup(spi);
199 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
204 ak4104->regmap = regmap_init_spi(spi, &ak4104_regmap);
205 if (IS_ERR(ak4104->regmap)) {
206 ret = PTR_ERR(ak4104->regmap);
210 /* read the 'reserved' register - according to the datasheet, it
211 * should contain 0x5b. Not a good way to verify the presence of
212 * the device, but there is no hardware ID register. */
213 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
216 if (val != AK4104_RESERVED_VAL) {
221 spi_set_drvdata(spi, ak4104);
223 ret = snd_soc_register_codec(&spi->dev,
224 &soc_codec_device_ak4104, &ak4104_dai, 1);
231 regmap_exit(ak4104->regmap);
235 static int __devexit ak4104_spi_remove(struct spi_device *spi)
237 struct ak4104_private *ak4101 = spi_get_drvdata(spi);
238 regmap_exit(ak4101->regmap);
239 snd_soc_unregister_codec(&spi->dev);
243 static struct spi_driver ak4104_spi_driver = {
246 .owner = THIS_MODULE,
248 .probe = ak4104_spi_probe,
249 .remove = __devexit_p(ak4104_spi_remove),
252 module_spi_driver(ak4104_spi_driver);
254 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
255 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
256 MODULE_LICENSE("GPL");