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 <sound/core.h>
14 #include <sound/soc.h>
15 #include <sound/initval.h>
16 #include <linux/spi/spi.h>
17 #include <sound/asoundef.h>
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
29 #define AK4104_REG_MASK 0x1f
30 #define AK4104_READ 0xc0
31 #define AK4104_WRITE 0xe0
32 #define AK4104_RESERVED_VAL 0x5b
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)
40 #define AK4104_CONTROL2_SEL0 (1 << 0)
41 #define AK4104_CONTROL2_SEL1 (1 << 1)
42 #define AK4104_CONTROL2_MODE (1 << 2)
44 #define AK4104_TX_TXE (1 << 0)
45 #define AK4104_TX_V (1 << 1)
47 #define DRV_NAME "ak4104"
49 struct ak4104_private {
50 struct snd_soc_codec codec;
51 u8 reg_cache[AK4104_NUM_REGS];
54 static int ak4104_fill_cache(struct snd_soc_codec *codec)
57 u8 *reg_cache = codec->reg_cache;
58 struct spi_device *spi = codec->control_data;
60 for (i = 0; i < codec->reg_cache_size; i++) {
61 int ret = spi_w8r8(spi, i | AK4104_READ);
63 dev_err(&spi->dev, "SPI write failure\n");
73 static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec,
76 u8 *reg_cache = codec->reg_cache;
78 if (reg >= codec->reg_cache_size)
81 return reg_cache[reg];
84 static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,
87 u8 *cache = codec->reg_cache;
88 struct spi_device *spi = codec->control_data;
90 if (reg >= codec->reg_cache_size)
93 /* only write to the hardware if value has changed */
94 if (cache[reg] != value) {
95 u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value };
97 if (spi_write(spi, tmp, sizeof(tmp))) {
98 dev_err(&spi->dev, "SPI write failed\n");
108 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
111 struct snd_soc_codec *codec = codec_dai->codec;
114 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
118 val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1);
121 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
122 case SND_SOC_DAIFMT_RIGHT_J:
124 case SND_SOC_DAIFMT_LEFT_J:
125 val |= AK4104_CONTROL1_DIF0;
127 case SND_SOC_DAIFMT_I2S:
128 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
131 dev_err(codec->dev, "invalid dai format\n");
135 /* This device can only be slave */
136 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
139 return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
142 static int ak4104_hw_params(struct snd_pcm_substream *substream,
143 struct snd_pcm_hw_params *params,
144 struct snd_soc_dai *dai)
146 struct snd_soc_pcm_runtime *rtd = substream->private_data;
147 struct snd_soc_device *socdev = rtd->socdev;
148 struct snd_soc_codec *codec = socdev->card->codec;
151 /* set the IEC958 bits: consumer mode, no copyright bit */
152 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
153 ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val);
157 switch (params_rate(params)) {
159 val |= IEC958_AES3_CON_FS_44100;
162 val |= IEC958_AES3_CON_FS_48000;
165 val |= IEC958_AES3_CON_FS_32000;
168 dev_err(codec->dev, "unsupported sampling rate\n");
172 return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val);
175 static struct snd_soc_dai_ops ak4101_dai_ops = {
176 .hw_params = ak4104_hw_params,
177 .set_fmt = ak4104_set_dai_fmt,
180 struct snd_soc_dai ak4104_dai = {
183 .stream_name = "Playback",
186 .rates = SNDRV_PCM_RATE_8000_192000,
187 .formats = SNDRV_PCM_FMTBIT_S16_LE |
188 SNDRV_PCM_FMTBIT_S24_3LE |
189 SNDRV_PCM_FMTBIT_S24_LE
191 .ops = &ak4101_dai_ops,
194 static struct snd_soc_codec *ak4104_codec;
196 static int ak4104_spi_probe(struct spi_device *spi)
198 struct snd_soc_codec *codec;
199 struct ak4104_private *ak4104;
202 spi->bits_per_word = 8;
203 spi->mode = SPI_MODE_0;
204 ret = spi_setup(spi);
208 ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL);
210 dev_err(&spi->dev, "could not allocate codec\n");
214 codec = &ak4104->codec;
215 mutex_init(&codec->mutex);
216 INIT_LIST_HEAD(&codec->dapm_widgets);
217 INIT_LIST_HEAD(&codec->dapm_paths);
219 codec->dev = &spi->dev;
220 codec->name = DRV_NAME;
221 codec->owner = THIS_MODULE;
222 codec->dai = &ak4104_dai;
224 codec->private_data = ak4104;
225 codec->control_data = spi;
226 codec->reg_cache = ak4104->reg_cache;
227 codec->reg_cache_size = AK4104_NUM_REGS;
229 /* read all regs and fill the cache */
230 ret = ak4104_fill_cache(codec);
232 dev_err(&spi->dev, "failed to fill register cache\n");
236 /* read the 'reserved' register - according to the datasheet, it
237 * should contain 0x5b. Not a good way to verify the presence of
238 * the device, but there is no hardware ID register. */
239 if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) !=
240 AK4104_RESERVED_VAL) {
242 goto error_free_codec;
245 /* set power-up and non-reset bits */
246 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
247 val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN;
248 ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
250 goto error_free_codec;
252 /* enable transmitter */
253 val = ak4104_read_reg_cache(codec, AK4104_REG_TX);
254 val |= AK4104_TX_TXE;
255 ret = ak4104_spi_write(codec, AK4104_REG_TX, val);
257 goto error_free_codec;
259 ak4104_codec = codec;
260 ret = snd_soc_register_dai(&ak4104_dai);
262 dev_err(&spi->dev, "failed to register DAI\n");
263 goto error_free_codec;
266 spi_set_drvdata(spi, ak4104);
267 dev_info(&spi->dev, "SPI device initialized\n");
272 ak4104_dai.dev = NULL;
276 static int __devexit ak4104_spi_remove(struct spi_device *spi)
279 struct ak4104_private *ak4104 = spi_get_drvdata(spi);
281 val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1);
285 /* clear power-up and non-reset bits */
286 val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
287 ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val);
296 static int ak4104_probe(struct platform_device *pdev)
298 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
299 struct snd_soc_codec *codec = ak4104_codec;
302 /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */
303 socdev->card->codec = codec;
306 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
308 dev_err(codec->dev, "failed to create pcms\n");
315 static int ak4104_remove(struct platform_device *pdev)
317 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
318 snd_soc_free_pcms(socdev);
322 struct snd_soc_codec_device soc_codec_device_ak4104 = {
323 .probe = ak4104_probe,
324 .remove = ak4104_remove
326 EXPORT_SYMBOL_GPL(soc_codec_device_ak4104);
328 static struct spi_driver ak4104_spi_driver = {
331 .owner = THIS_MODULE,
333 .probe = ak4104_spi_probe,
334 .remove = __devexit_p(ak4104_spi_remove),
337 static int __init ak4104_init(void)
339 pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n");
340 return spi_register_driver(&ak4104_spi_driver);
342 module_init(ak4104_init);
344 static void __exit ak4104_exit(void)
346 spi_unregister_driver(&ak4104_spi_driver);
348 module_exit(ak4104_exit);
350 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
351 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
352 MODULE_LICENSE("GPL");