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>
22 /* AK4104 registers addresses */
23 #define AK4104_REG_CONTROL1 0x00
24 #define AK4104_REG_RESERVED 0x01
25 #define AK4104_REG_CONTROL2 0x02
26 #define AK4104_REG_TX 0x03
27 #define AK4104_REG_CHN_STATUS(x) ((x) + 0x04)
28 #define AK4104_NUM_REGS 10
30 #define AK4104_REG_MASK 0x1f
31 #define AK4104_READ 0xc0
32 #define AK4104_WRITE 0xe0
33 #define AK4104_RESERVED_VAL 0x5b
35 /* Bit masks for AK4104 registers */
36 #define AK4104_CONTROL1_RSTN (1 << 0)
37 #define AK4104_CONTROL1_PW (1 << 1)
38 #define AK4104_CONTROL1_DIF0 (1 << 2)
39 #define AK4104_CONTROL1_DIF1 (1 << 3)
41 #define AK4104_CONTROL2_SEL0 (1 << 0)
42 #define AK4104_CONTROL2_SEL1 (1 << 1)
43 #define AK4104_CONTROL2_MODE (1 << 2)
45 #define AK4104_TX_TXE (1 << 0)
46 #define AK4104_TX_V (1 << 1)
48 #define DRV_NAME "ak4104"
50 struct ak4104_private {
51 struct snd_soc_codec codec;
52 u8 reg_cache[AK4104_NUM_REGS];
55 static int ak4104_fill_cache(struct snd_soc_codec *codec)
58 u8 *reg_cache = codec->reg_cache;
59 struct spi_device *spi = codec->control_data;
61 for (i = 0; i < codec->reg_cache_size; i++) {
62 int ret = spi_w8r8(spi, i | AK4104_READ);
64 dev_err(&spi->dev, "SPI write failure\n");
74 static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec,
77 u8 *reg_cache = codec->reg_cache;
79 if (reg >= codec->reg_cache_size)
82 return reg_cache[reg];
85 static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,
88 u8 *cache = codec->reg_cache;
89 struct spi_device *spi = codec->control_data;
91 if (reg >= codec->reg_cache_size)
94 /* only write to the hardware if value has changed */
95 if (cache[reg] != value) {
96 u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value };
98 if (spi_write(spi, tmp, sizeof(tmp))) {
99 dev_err(&spi->dev, "SPI write failed\n");
109 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
112 struct snd_soc_codec *codec = codec_dai->codec;
115 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
119 val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1);
122 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
123 case SND_SOC_DAIFMT_RIGHT_J:
125 case SND_SOC_DAIFMT_LEFT_J:
126 val |= AK4104_CONTROL1_DIF0;
128 case SND_SOC_DAIFMT_I2S:
129 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
132 dev_err(codec->dev, "invalid dai format\n");
136 /* This device can only be slave */
137 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
140 return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
143 static int ak4104_hw_params(struct snd_pcm_substream *substream,
144 struct snd_pcm_hw_params *params,
145 struct snd_soc_dai *dai)
147 struct snd_soc_pcm_runtime *rtd = substream->private_data;
148 struct snd_soc_device *socdev = rtd->socdev;
149 struct snd_soc_codec *codec = socdev->card->codec;
152 /* set the IEC958 bits: consumer mode, no copyright bit */
153 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
154 ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val);
158 switch (params_rate(params)) {
160 val |= IEC958_AES3_CON_FS_44100;
163 val |= IEC958_AES3_CON_FS_48000;
166 val |= IEC958_AES3_CON_FS_32000;
169 dev_err(codec->dev, "unsupported sampling rate\n");
173 return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val);
176 static struct snd_soc_dai_ops ak4101_dai_ops = {
177 .hw_params = ak4104_hw_params,
178 .set_fmt = ak4104_set_dai_fmt,
181 struct snd_soc_dai ak4104_dai = {
184 .stream_name = "Playback",
187 .rates = SNDRV_PCM_RATE_8000_192000,
188 .formats = SNDRV_PCM_FMTBIT_S16_LE |
189 SNDRV_PCM_FMTBIT_S24_3LE |
190 SNDRV_PCM_FMTBIT_S24_LE
192 .ops = &ak4101_dai_ops,
195 static struct snd_soc_codec *ak4104_codec;
197 static int ak4104_spi_probe(struct spi_device *spi)
199 struct snd_soc_codec *codec;
200 struct ak4104_private *ak4104;
203 spi->bits_per_word = 8;
204 spi->mode = SPI_MODE_0;
205 ret = spi_setup(spi);
209 ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL);
211 dev_err(&spi->dev, "could not allocate codec\n");
215 codec = &ak4104->codec;
216 mutex_init(&codec->mutex);
217 INIT_LIST_HEAD(&codec->dapm_widgets);
218 INIT_LIST_HEAD(&codec->dapm_paths);
220 codec->dev = &spi->dev;
221 codec->name = DRV_NAME;
222 codec->owner = THIS_MODULE;
223 codec->dai = &ak4104_dai;
225 snd_soc_codec_set_drvdata(codec, ak4104);
226 codec->control_data = spi;
227 codec->reg_cache = ak4104->reg_cache;
228 codec->reg_cache_size = AK4104_NUM_REGS;
230 /* read all regs and fill the cache */
231 ret = ak4104_fill_cache(codec);
233 dev_err(&spi->dev, "failed to fill register cache\n");
237 /* read the 'reserved' register - according to the datasheet, it
238 * should contain 0x5b. Not a good way to verify the presence of
239 * the device, but there is no hardware ID register. */
240 if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) !=
241 AK4104_RESERVED_VAL) {
243 goto error_free_codec;
246 /* set power-up and non-reset bits */
247 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
248 val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN;
249 ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
251 goto error_free_codec;
253 /* enable transmitter */
254 val = ak4104_read_reg_cache(codec, AK4104_REG_TX);
255 val |= AK4104_TX_TXE;
256 ret = ak4104_spi_write(codec, AK4104_REG_TX, val);
258 goto error_free_codec;
260 ak4104_codec = codec;
261 ret = snd_soc_register_dai(&ak4104_dai);
263 dev_err(&spi->dev, "failed to register DAI\n");
264 goto error_free_codec;
267 spi_set_drvdata(spi, ak4104);
268 dev_info(&spi->dev, "SPI device initialized\n");
273 ak4104_dai.dev = NULL;
277 static int __devexit ak4104_spi_remove(struct spi_device *spi)
280 struct ak4104_private *ak4104 = spi_get_drvdata(spi);
282 val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1);
286 /* clear power-up and non-reset bits */
287 val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
288 ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val);
297 static int ak4104_probe(struct platform_device *pdev)
299 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
300 struct snd_soc_codec *codec = ak4104_codec;
303 /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */
304 socdev->card->codec = codec;
307 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
309 dev_err(codec->dev, "failed to create pcms\n");
316 static int ak4104_remove(struct platform_device *pdev)
318 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
319 snd_soc_free_pcms(socdev);
323 struct snd_soc_codec_device soc_codec_device_ak4104 = {
324 .probe = ak4104_probe,
325 .remove = ak4104_remove
327 EXPORT_SYMBOL_GPL(soc_codec_device_ak4104);
329 static struct spi_driver ak4104_spi_driver = {
332 .owner = THIS_MODULE,
334 .probe = ak4104_spi_probe,
335 .remove = __devexit_p(ak4104_spi_remove),
338 static int __init ak4104_init(void)
340 pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n");
341 return spi_register_driver(&ak4104_spi_driver);
343 module_init(ak4104_init);
345 static void __exit ak4104_exit(void)
347 spi_unregister_driver(&ak4104_spi_driver);
349 module_exit(ak4104_exit);
351 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
352 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
353 MODULE_LICENSE("GPL");