2 * wm8728.c -- WM8728 ALSA SoC Audio driver
4 * Copyright 2008 Wolfson Microelectronics plc
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
18 #include <linux/i2c.h>
19 #include <linux/platform_device.h>
20 #include <linux/regmap.h>
21 #include <linux/spi/spi.h>
22 #include <linux/slab.h>
23 #include <linux/of_device.h>
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27 #include <sound/soc.h>
28 #include <sound/initval.h>
29 #include <sound/tlv.h>
34 * We can't read the WM8728 register space so we cache them instead.
35 * Note that the defaults here aren't the physical defaults, we latch
36 * the volume update bits, mute the output and enable infinite zero
39 static const struct reg_default wm8728_reg_defaults[] = {
46 /* codec private data */
48 struct regmap *regmap;
51 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
53 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
55 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
56 0, 255, 0, wm8728_tlv),
58 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
64 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
65 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
66 SND_SOC_DAPM_OUTPUT("VOUTL"),
67 SND_SOC_DAPM_OUTPUT("VOUTR"),
70 static const struct snd_soc_dapm_route wm8728_intercon[] = {
71 {"VOUTL", NULL, "DAC"},
72 {"VOUTR", NULL, "DAC"},
75 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
77 struct snd_soc_codec *codec = dai->codec;
78 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
81 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
83 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
88 static int wm8728_hw_params(struct snd_pcm_substream *substream,
89 struct snd_pcm_hw_params *params,
90 struct snd_soc_dai *dai)
92 struct snd_soc_codec *codec = dai->codec;
93 u16 dac = snd_soc_read(codec, WM8728_DACCTL);
97 switch (params_width(params)) {
110 snd_soc_write(codec, WM8728_DACCTL, dac);
115 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
118 struct snd_soc_codec *codec = codec_dai->codec;
119 u16 iface = snd_soc_read(codec, WM8728_IFCTL);
121 /* Currently only I2S is supported by the driver, though the
122 * hardware is more flexible.
124 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
125 case SND_SOC_DAIFMT_I2S:
132 /* The hardware only support full slave mode */
133 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
134 case SND_SOC_DAIFMT_CBS_CFS:
140 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
141 case SND_SOC_DAIFMT_NB_NF:
144 case SND_SOC_DAIFMT_IB_NF:
148 case SND_SOC_DAIFMT_NB_IF:
152 case SND_SOC_DAIFMT_IB_IF:
159 snd_soc_write(codec, WM8728_IFCTL, iface);
163 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
164 enum snd_soc_bias_level level)
166 struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
170 case SND_SOC_BIAS_ON:
171 case SND_SOC_BIAS_PREPARE:
172 case SND_SOC_BIAS_STANDBY:
173 if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
174 /* Power everything up... */
175 reg = snd_soc_read(codec, WM8728_DACCTL);
176 snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
178 /* ..then sync in the register cache. */
179 regcache_sync(wm8728->regmap);
183 case SND_SOC_BIAS_OFF:
184 reg = snd_soc_read(codec, WM8728_DACCTL);
185 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
191 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
193 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
194 SNDRV_PCM_FMTBIT_S24_LE)
196 static const struct snd_soc_dai_ops wm8728_dai_ops = {
197 .hw_params = wm8728_hw_params,
198 .digital_mute = wm8728_mute,
199 .set_fmt = wm8728_set_dai_fmt,
202 static struct snd_soc_dai_driver wm8728_dai = {
203 .name = "wm8728-hifi",
205 .stream_name = "Playback",
208 .rates = WM8728_RATES,
209 .formats = WM8728_FORMATS,
211 .ops = &wm8728_dai_ops,
214 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
215 .set_bias_level = wm8728_set_bias_level,
216 .suspend_bias_off = true,
218 .controls = wm8728_snd_controls,
219 .num_controls = ARRAY_SIZE(wm8728_snd_controls),
220 .dapm_widgets = wm8728_dapm_widgets,
221 .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
222 .dapm_routes = wm8728_intercon,
223 .num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
226 static const struct of_device_id wm8728_of_match[] = {
227 { .compatible = "wlf,wm8728", },
230 MODULE_DEVICE_TABLE(of, wm8728_of_match);
232 static const struct regmap_config wm8728_regmap = {
235 .max_register = WM8728_IFCTL,
237 .reg_defaults = wm8728_reg_defaults,
238 .num_reg_defaults = ARRAY_SIZE(wm8728_reg_defaults),
239 .cache_type = REGCACHE_RBTREE,
242 #if defined(CONFIG_SPI_MASTER)
243 static int wm8728_spi_probe(struct spi_device *spi)
245 struct wm8728_priv *wm8728;
248 wm8728 = devm_kzalloc(&spi->dev, sizeof(struct wm8728_priv),
253 wm8728->regmap = devm_regmap_init_spi(spi, &wm8728_regmap);
254 if (IS_ERR(wm8728->regmap))
255 return PTR_ERR(wm8728->regmap);
257 spi_set_drvdata(spi, wm8728);
259 ret = snd_soc_register_codec(&spi->dev,
260 &soc_codec_dev_wm8728, &wm8728_dai, 1);
265 static int wm8728_spi_remove(struct spi_device *spi)
267 snd_soc_unregister_codec(&spi->dev);
272 static struct spi_driver wm8728_spi_driver = {
275 .owner = THIS_MODULE,
276 .of_match_table = wm8728_of_match,
278 .probe = wm8728_spi_probe,
279 .remove = wm8728_spi_remove,
281 #endif /* CONFIG_SPI_MASTER */
283 #if IS_ENABLED(CONFIG_I2C)
284 static int wm8728_i2c_probe(struct i2c_client *i2c,
285 const struct i2c_device_id *id)
287 struct wm8728_priv *wm8728;
290 wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv),
295 wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap);
296 if (IS_ERR(wm8728->regmap))
297 return PTR_ERR(wm8728->regmap);
299 i2c_set_clientdata(i2c, wm8728);
301 ret = snd_soc_register_codec(&i2c->dev,
302 &soc_codec_dev_wm8728, &wm8728_dai, 1);
307 static int wm8728_i2c_remove(struct i2c_client *client)
309 snd_soc_unregister_codec(&client->dev);
313 static const struct i2c_device_id wm8728_i2c_id[] = {
317 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
319 static struct i2c_driver wm8728_i2c_driver = {
322 .of_match_table = wm8728_of_match,
324 .probe = wm8728_i2c_probe,
325 .remove = wm8728_i2c_remove,
326 .id_table = wm8728_i2c_id,
330 static int __init wm8728_modinit(void)
333 #if IS_ENABLED(CONFIG_I2C)
334 ret = i2c_add_driver(&wm8728_i2c_driver);
336 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
340 #if defined(CONFIG_SPI_MASTER)
341 ret = spi_register_driver(&wm8728_spi_driver);
343 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
349 module_init(wm8728_modinit);
351 static void __exit wm8728_exit(void)
353 #if IS_ENABLED(CONFIG_I2C)
354 i2c_del_driver(&wm8728_i2c_driver);
356 #if defined(CONFIG_SPI_MASTER)
357 spi_unregister_driver(&wm8728_spi_driver);
360 module_exit(wm8728_exit);
362 MODULE_DESCRIPTION("ASoC WM8728 driver");
363 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
364 MODULE_LICENSE("GPL");