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 <linux/of_device.h>
19 #include <linux/of_gpio.h>
20 #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 struct ak4104_private {
49 struct regmap *regmap;
52 static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
53 SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),
55 SND_SOC_DAPM_OUTPUT("TX"),
58 static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
59 { "TXE", NULL, "Playback" },
60 { "TX", NULL, "TXE" },
63 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
66 struct snd_soc_codec *codec = codec_dai->codec;
67 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
72 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
73 case SND_SOC_DAIFMT_RIGHT_J:
75 case SND_SOC_DAIFMT_LEFT_J:
76 val |= AK4104_CONTROL1_DIF0;
78 case SND_SOC_DAIFMT_I2S:
79 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
82 dev_err(codec->dev, "invalid dai format\n");
86 /* This device can only be slave */
87 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
90 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
91 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
99 static int ak4104_hw_params(struct snd_pcm_substream *substream,
100 struct snd_pcm_hw_params *params,
101 struct snd_soc_dai *dai)
103 struct snd_soc_codec *codec = dai->codec;
104 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
107 /* set the IEC958 bits: consumer mode, no copyright bit */
108 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
109 regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
113 switch (params_rate(params)) {
115 val |= IEC958_AES3_CON_FS_22050;
118 val |= IEC958_AES3_CON_FS_24000;
121 val |= IEC958_AES3_CON_FS_32000;
124 val |= IEC958_AES3_CON_FS_44100;
127 val |= IEC958_AES3_CON_FS_48000;
130 val |= IEC958_AES3_CON_FS_88200;
133 val |= IEC958_AES3_CON_FS_96000;
136 val |= IEC958_AES3_CON_FS_176400;
139 val |= IEC958_AES3_CON_FS_192000;
142 dev_err(codec->dev, "unsupported sampling rate\n");
146 ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
153 static const struct snd_soc_dai_ops ak4101_dai_ops = {
154 .hw_params = ak4104_hw_params,
155 .set_fmt = ak4104_set_dai_fmt,
158 static struct snd_soc_dai_driver ak4104_dai = {
159 .name = "ak4104-hifi",
161 .stream_name = "Playback",
164 .rates = SNDRV_PCM_RATE_8000_192000,
165 .formats = SNDRV_PCM_FMTBIT_S16_LE |
166 SNDRV_PCM_FMTBIT_S24_3LE |
167 SNDRV_PCM_FMTBIT_S24_LE
169 .ops = &ak4101_dai_ops,
172 static int ak4104_probe(struct snd_soc_codec *codec)
174 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
177 codec->control_data = ak4104->regmap;
179 /* set power-up and non-reset bits */
180 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
181 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
182 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
186 /* enable transmitter */
187 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
188 AK4104_TX_TXE, AK4104_TX_TXE);
195 static int ak4104_remove(struct snd_soc_codec *codec)
197 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
199 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
200 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
205 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
206 .probe = ak4104_probe,
207 .remove = ak4104_remove,
209 .dapm_widgets = ak4104_dapm_widgets,
210 .num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets),
211 .dapm_routes = ak4104_dapm_routes,
212 .num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes),
215 static const struct regmap_config ak4104_regmap = {
219 .max_register = AK4104_NUM_REGS - 1,
220 .read_flag_mask = AK4104_READ,
221 .write_flag_mask = AK4104_WRITE,
223 .cache_type = REGCACHE_RBTREE,
226 static int ak4104_spi_probe(struct spi_device *spi)
228 struct device_node *np = spi->dev.of_node;
229 struct ak4104_private *ak4104;
233 spi->bits_per_word = 8;
234 spi->mode = SPI_MODE_0;
235 ret = spi_setup(spi);
239 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
244 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
245 if (IS_ERR(ak4104->regmap)) {
246 ret = PTR_ERR(ak4104->regmap);
251 enum of_gpio_flags flags;
252 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
254 if (gpio_is_valid(gpio)) {
255 ret = devm_gpio_request_one(&spi->dev, gpio,
256 flags & OF_GPIO_ACTIVE_LOW ?
257 GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
264 /* read the 'reserved' register - according to the datasheet, it
265 * should contain 0x5b. Not a good way to verify the presence of
266 * the device, but there is no hardware ID register. */
267 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
270 if (val != AK4104_RESERVED_VAL)
273 spi_set_drvdata(spi, ak4104);
275 ret = snd_soc_register_codec(&spi->dev,
276 &soc_codec_device_ak4104, &ak4104_dai, 1);
280 static int ak4104_spi_remove(struct spi_device *spi)
282 snd_soc_unregister_codec(&spi->dev);
286 static const struct of_device_id ak4104_of_match[] = {
287 { .compatible = "asahi-kasei,ak4104", },
290 MODULE_DEVICE_TABLE(of, ak4104_of_match);
292 static const struct spi_device_id ak4104_id_table[] = {
296 MODULE_DEVICE_TABLE(spi, ak4104_id_table);
298 static struct spi_driver ak4104_spi_driver = {
301 .owner = THIS_MODULE,
302 .of_match_table = ak4104_of_match,
304 .id_table = ak4104_id_table,
305 .probe = ak4104_spi_probe,
306 .remove = ak4104_spi_remove,
309 module_spi_driver(ak4104_spi_driver);
311 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
312 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
313 MODULE_LICENSE("GPL");