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 <linux/spi/spi.h>
15 #include <linux/of_device.h>
16 #include <linux/of_gpio.h>
17 #include <linux/regulator/consumer.h>
18 #include <sound/asoundef.h>
19 #include <sound/core.h>
20 #include <sound/soc.h>
21 #include <sound/initval.h>
23 /* AK4104 registers addresses */
24 #define AK4104_REG_CONTROL1 0x00
25 #define AK4104_REG_RESERVED 0x01
26 #define AK4104_REG_CONTROL2 0x02
27 #define AK4104_REG_TX 0x03
28 #define AK4104_REG_CHN_STATUS(x) ((x) + 0x04)
29 #define AK4104_NUM_REGS 10
31 #define AK4104_REG_MASK 0x1f
32 #define AK4104_READ 0xc0
33 #define AK4104_WRITE 0xe0
34 #define AK4104_RESERVED_VAL 0x5b
36 /* Bit masks for AK4104 registers */
37 #define AK4104_CONTROL1_RSTN (1 << 0)
38 #define AK4104_CONTROL1_PW (1 << 1)
39 #define AK4104_CONTROL1_DIF0 (1 << 2)
40 #define AK4104_CONTROL1_DIF1 (1 << 3)
42 #define AK4104_CONTROL2_SEL0 (1 << 0)
43 #define AK4104_CONTROL2_SEL1 (1 << 1)
44 #define AK4104_CONTROL2_MODE (1 << 2)
46 #define AK4104_TX_TXE (1 << 0)
47 #define AK4104_TX_V (1 << 1)
49 struct ak4104_private {
50 struct regmap *regmap;
51 struct regulator *regulator;
54 static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
55 SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),
57 SND_SOC_DAPM_OUTPUT("TX"),
60 static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
61 { "TXE", NULL, "Playback" },
62 { "TX", NULL, "TXE" },
65 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
68 struct snd_soc_codec *codec = codec_dai->codec;
69 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
74 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
75 case SND_SOC_DAIFMT_RIGHT_J:
77 case SND_SOC_DAIFMT_LEFT_J:
78 val |= AK4104_CONTROL1_DIF0;
80 case SND_SOC_DAIFMT_I2S:
81 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
84 dev_err(codec->dev, "invalid dai format\n");
88 /* This device can only be slave */
89 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
92 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
93 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
101 static int ak4104_hw_params(struct snd_pcm_substream *substream,
102 struct snd_pcm_hw_params *params,
103 struct snd_soc_dai *dai)
105 struct snd_soc_codec *codec = dai->codec;
106 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
109 /* set the IEC958 bits: consumer mode, no copyright bit */
110 val |= IEC958_AES0_CON_NOT_COPYRIGHT;
111 regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
115 switch (params_rate(params)) {
117 val |= IEC958_AES3_CON_FS_22050;
120 val |= IEC958_AES3_CON_FS_24000;
123 val |= IEC958_AES3_CON_FS_32000;
126 val |= IEC958_AES3_CON_FS_44100;
129 val |= IEC958_AES3_CON_FS_48000;
132 val |= IEC958_AES3_CON_FS_88200;
135 val |= IEC958_AES3_CON_FS_96000;
138 val |= IEC958_AES3_CON_FS_176400;
141 val |= IEC958_AES3_CON_FS_192000;
144 dev_err(codec->dev, "unsupported sampling rate\n");
148 ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
155 static const struct snd_soc_dai_ops ak4101_dai_ops = {
156 .hw_params = ak4104_hw_params,
157 .set_fmt = ak4104_set_dai_fmt,
160 static struct snd_soc_dai_driver ak4104_dai = {
161 .name = "ak4104-hifi",
163 .stream_name = "Playback",
166 .rates = SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
167 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
168 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
169 SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000,
170 .formats = SNDRV_PCM_FMTBIT_S16_LE |
171 SNDRV_PCM_FMTBIT_S24_3LE |
172 SNDRV_PCM_FMTBIT_S24_LE
174 .ops = &ak4101_dai_ops,
177 static int ak4104_probe(struct snd_soc_codec *codec)
179 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
182 ret = regulator_enable(ak4104->regulator);
184 dev_err(codec->dev, "Unable to enable regulator: %d\n", ret);
188 /* set power-up and non-reset bits */
189 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
190 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
191 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
193 goto exit_disable_regulator;
195 /* enable transmitter */
196 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
197 AK4104_TX_TXE, AK4104_TX_TXE);
199 goto exit_disable_regulator;
203 exit_disable_regulator:
204 regulator_disable(ak4104->regulator);
208 static int ak4104_remove(struct snd_soc_codec *codec)
210 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
212 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
213 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
214 regulator_disable(ak4104->regulator);
220 static int ak4104_soc_suspend(struct snd_soc_codec *codec)
222 struct ak4104_private *priv = snd_soc_codec_get_drvdata(codec);
224 regulator_disable(priv->regulator);
229 static int ak4104_soc_resume(struct snd_soc_codec *codec)
231 struct ak4104_private *priv = snd_soc_codec_get_drvdata(codec);
234 ret = regulator_enable(priv->regulator);
241 #define ak4104_soc_suspend NULL
242 #define ak4104_soc_resume NULL
243 #endif /* CONFIG_PM */
245 static struct snd_soc_codec_driver soc_codec_device_ak4104 = {
246 .probe = ak4104_probe,
247 .remove = ak4104_remove,
248 .suspend = ak4104_soc_suspend,
249 .resume = ak4104_soc_resume,
251 .component_driver = {
252 .dapm_widgets = ak4104_dapm_widgets,
253 .num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets),
254 .dapm_routes = ak4104_dapm_routes,
255 .num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes),
259 static const struct regmap_config ak4104_regmap = {
263 .max_register = AK4104_NUM_REGS - 1,
264 .read_flag_mask = AK4104_READ,
265 .write_flag_mask = AK4104_WRITE,
267 .cache_type = REGCACHE_RBTREE,
270 static int ak4104_spi_probe(struct spi_device *spi)
272 struct device_node *np = spi->dev.of_node;
273 struct ak4104_private *ak4104;
277 spi->bits_per_word = 8;
278 spi->mode = SPI_MODE_0;
279 ret = spi_setup(spi);
283 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
288 ak4104->regulator = devm_regulator_get(&spi->dev, "vdd");
289 if (IS_ERR(ak4104->regulator)) {
290 ret = PTR_ERR(ak4104->regulator);
291 dev_err(&spi->dev, "Unable to get Vdd regulator: %d\n", ret);
295 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
296 if (IS_ERR(ak4104->regmap)) {
297 ret = PTR_ERR(ak4104->regmap);
302 enum of_gpio_flags flags;
303 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
305 if (gpio_is_valid(gpio)) {
306 ret = devm_gpio_request_one(&spi->dev, gpio,
307 flags & OF_GPIO_ACTIVE_LOW ?
308 GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
315 /* read the 'reserved' register - according to the datasheet, it
316 * should contain 0x5b. Not a good way to verify the presence of
317 * the device, but there is no hardware ID register. */
318 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
321 if (val != AK4104_RESERVED_VAL)
324 spi_set_drvdata(spi, ak4104);
326 ret = snd_soc_register_codec(&spi->dev,
327 &soc_codec_device_ak4104, &ak4104_dai, 1);
331 static int ak4104_spi_remove(struct spi_device *spi)
333 snd_soc_unregister_codec(&spi->dev);
337 static const struct of_device_id ak4104_of_match[] = {
338 { .compatible = "asahi-kasei,ak4104", },
341 MODULE_DEVICE_TABLE(of, ak4104_of_match);
343 static const struct spi_device_id ak4104_id_table[] = {
347 MODULE_DEVICE_TABLE(spi, ak4104_id_table);
349 static struct spi_driver ak4104_spi_driver = {
352 .of_match_table = ak4104_of_match,
354 .id_table = ak4104_id_table,
355 .probe = ak4104_spi_probe,
356 .remove = ak4104_spi_remove,
359 module_spi_driver(ak4104_spi_driver);
361 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
362 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
363 MODULE_LICENSE("GPL");