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 reg &= AK4104_REG_MASK;
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");
110 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
113 struct snd_soc_codec *codec = codec_dai->codec;
116 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
120 val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1);
123 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
124 case SND_SOC_DAIFMT_RIGHT_J:
126 case SND_SOC_DAIFMT_LEFT_J:
127 val |= AK4104_CONTROL1_DIF0;
129 case SND_SOC_DAIFMT_I2S:
130 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
133 dev_err(codec->dev, "invalid dai format\n");
137 /* This device can only be slave */
138 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
141 return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
144 static int ak4104_hw_params(struct snd_pcm_substream *substream,
145 struct snd_pcm_hw_params *params,
146 struct snd_soc_dai *dai)
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;
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);
159 switch (params_rate(params)) {
161 val |= IEC958_AES3_CON_FS_44100;
164 val |= IEC958_AES3_CON_FS_48000;
167 val |= IEC958_AES3_CON_FS_32000;
170 dev_err(codec->dev, "unsupported sampling rate\n");
174 return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val);
177 struct snd_soc_dai ak4104_dai = {
180 .stream_name = "Playback",
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
191 .hw_params = ak4104_hw_params,
192 .set_fmt = ak4104_set_dai_fmt,
196 static struct snd_soc_codec *ak4104_codec;
198 static int ak4104_spi_probe(struct spi_device *spi)
200 struct snd_soc_codec *codec;
201 struct ak4104_private *ak4104;
204 spi->bits_per_word = 8;
205 spi->mode = SPI_MODE_0;
206 ret = spi_setup(spi);
210 ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL);
212 dev_err(&spi->dev, "could not allocate codec\n");
216 codec = &ak4104->codec;
217 mutex_init(&codec->mutex);
218 INIT_LIST_HEAD(&codec->dapm_widgets);
219 INIT_LIST_HEAD(&codec->dapm_paths);
221 codec->dev = &spi->dev;
222 codec->name = DRV_NAME;
223 codec->owner = THIS_MODULE;
224 codec->dai = &ak4104_dai;
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;
231 /* read all regs and fill the cache */
232 ret = ak4104_fill_cache(codec);
234 dev_err(&spi->dev, "failed to fill register cache\n");
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) {
244 goto error_free_codec;
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);
252 goto error_free_codec;
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);
259 goto error_free_codec;
261 ak4104_codec = codec;
262 ret = snd_soc_register_dai(&ak4104_dai);
264 dev_err(&spi->dev, "failed to register DAI\n");
265 goto error_free_codec;
268 spi_set_drvdata(spi, ak4104);
269 dev_info(&spi->dev, "SPI device initialized\n");
274 ak4104_dai.dev = NULL;
278 static int __devexit ak4104_spi_remove(struct spi_device *spi)
281 struct ak4104_private *ak4104 = spi_get_drvdata(spi);
283 val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1);
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);
298 static int ak4104_probe(struct platform_device *pdev)
300 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
301 struct snd_soc_codec *codec = ak4104_codec;
304 /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */
305 socdev->card->codec = codec;
308 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
310 dev_err(codec->dev, "failed to create pcms\n");
314 /* Register the socdev */
315 ret = snd_soc_init_card(socdev);
317 dev_err(codec->dev, "failed to register card\n");
318 snd_soc_free_pcms(socdev);
325 static int ak4104_remove(struct platform_device *pdev)
327 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
328 snd_soc_free_pcms(socdev);
332 struct snd_soc_codec_device soc_codec_device_ak4104 = {
333 .probe = ak4104_probe,
334 .remove = ak4104_remove
336 EXPORT_SYMBOL_GPL(soc_codec_device_ak4104);
338 static struct spi_driver ak4104_spi_driver = {
341 .owner = THIS_MODULE,
343 .probe = ak4104_spi_probe,
344 .remove = __devexit_p(ak4104_spi_remove),
347 static int __init ak4104_init(void)
349 pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n");
350 return spi_register_driver(&ak4104_spi_driver);
352 module_init(ak4104_init);
354 static void __exit ak4104_exit(void)
356 spi_unregister_driver(&ak4104_spi_driver);
358 module_exit(ak4104_exit);
360 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
361 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
362 MODULE_LICENSE("GPL");