1 // SPDX-License-Identifier: GPL-2.0-only
3 * wm8728.c -- WM8728 ALSA SoC Audio driver
5 * Copyright 2008 Wolfson Microelectronics plc
10 #include <linux/mod_devicetable.h>
11 #include <linux/module.h>
12 #include <linux/moduleparam.h>
13 #include <linux/init.h>
14 #include <linux/delay.h>
16 #include <linux/i2c.h>
17 #include <linux/platform_device.h>
18 #include <linux/regmap.h>
19 #include <linux/spi/spi.h>
20 #include <linux/slab.h>
21 #include <sound/core.h>
22 #include <sound/pcm.h>
23 #include <sound/pcm_params.h>
24 #include <sound/soc.h>
25 #include <sound/initval.h>
26 #include <sound/tlv.h>
31 * We can't read the WM8728 register space so we cache them instead.
32 * Note that the defaults here aren't the physical defaults, we latch
33 * the volume update bits, mute the output and enable infinite zero
36 static const struct reg_default wm8728_reg_defaults[] = {
43 /* codec private data */
45 struct regmap *regmap;
48 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
50 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
52 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
53 0, 255, 0, wm8728_tlv),
55 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
61 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
62 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
63 SND_SOC_DAPM_OUTPUT("VOUTL"),
64 SND_SOC_DAPM_OUTPUT("VOUTR"),
67 static const struct snd_soc_dapm_route wm8728_intercon[] = {
68 {"VOUTL", NULL, "DAC"},
69 {"VOUTR", NULL, "DAC"},
72 static int wm8728_mute(struct snd_soc_dai *dai, int mute, int direction)
74 struct snd_soc_component *component = dai->component;
75 u16 mute_reg = snd_soc_component_read(component, WM8728_DACCTL);
78 snd_soc_component_write(component, WM8728_DACCTL, mute_reg | 1);
80 snd_soc_component_write(component, WM8728_DACCTL, mute_reg & ~1);
85 static int wm8728_hw_params(struct snd_pcm_substream *substream,
86 struct snd_pcm_hw_params *params,
87 struct snd_soc_dai *dai)
89 struct snd_soc_component *component = dai->component;
90 u16 dac = snd_soc_component_read(component, WM8728_DACCTL);
94 switch (params_width(params)) {
107 snd_soc_component_write(component, WM8728_DACCTL, dac);
112 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
115 struct snd_soc_component *component = codec_dai->component;
116 u16 iface = snd_soc_component_read(component, WM8728_IFCTL);
118 /* Currently only I2S is supported by the driver, though the
119 * hardware is more flexible.
121 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
122 case SND_SOC_DAIFMT_I2S:
129 /* The hardware only support full slave mode */
130 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
131 case SND_SOC_DAIFMT_CBS_CFS:
137 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
138 case SND_SOC_DAIFMT_NB_NF:
141 case SND_SOC_DAIFMT_IB_NF:
145 case SND_SOC_DAIFMT_NB_IF:
149 case SND_SOC_DAIFMT_IB_IF:
156 snd_soc_component_write(component, WM8728_IFCTL, iface);
160 static int wm8728_set_bias_level(struct snd_soc_component *component,
161 enum snd_soc_bias_level level)
163 struct wm8728_priv *wm8728 = snd_soc_component_get_drvdata(component);
167 case SND_SOC_BIAS_ON:
168 case SND_SOC_BIAS_PREPARE:
169 case SND_SOC_BIAS_STANDBY:
170 if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
171 /* Power everything up... */
172 reg = snd_soc_component_read(component, WM8728_DACCTL);
173 snd_soc_component_write(component, WM8728_DACCTL, reg & ~0x4);
175 /* ..then sync in the register cache. */
176 regcache_sync(wm8728->regmap);
180 case SND_SOC_BIAS_OFF:
181 reg = snd_soc_component_read(component, WM8728_DACCTL);
182 snd_soc_component_write(component, WM8728_DACCTL, reg | 0x4);
188 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
190 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
191 SNDRV_PCM_FMTBIT_S24_LE)
193 static const struct snd_soc_dai_ops wm8728_dai_ops = {
194 .hw_params = wm8728_hw_params,
195 .mute_stream = wm8728_mute,
196 .set_fmt = wm8728_set_dai_fmt,
197 .no_capture_mute = 1,
200 static struct snd_soc_dai_driver wm8728_dai = {
201 .name = "wm8728-hifi",
203 .stream_name = "Playback",
206 .rates = WM8728_RATES,
207 .formats = WM8728_FORMATS,
209 .ops = &wm8728_dai_ops,
212 static const struct snd_soc_component_driver soc_component_dev_wm8728 = {
213 .set_bias_level = wm8728_set_bias_level,
214 .controls = wm8728_snd_controls,
215 .num_controls = ARRAY_SIZE(wm8728_snd_controls),
216 .dapm_widgets = wm8728_dapm_widgets,
217 .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
218 .dapm_routes = wm8728_intercon,
219 .num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
220 .suspend_bias_off = 1,
222 .use_pmdown_time = 1,
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_MAPLE,
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 = devm_snd_soc_register_component(&spi->dev,
260 &soc_component_dev_wm8728, &wm8728_dai, 1);
265 static struct spi_driver wm8728_spi_driver = {
268 .of_match_table = wm8728_of_match,
270 .probe = wm8728_spi_probe,
272 #endif /* CONFIG_SPI_MASTER */
274 #if IS_ENABLED(CONFIG_I2C)
275 static int wm8728_i2c_probe(struct i2c_client *i2c)
277 struct wm8728_priv *wm8728;
280 wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv),
285 wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap);
286 if (IS_ERR(wm8728->regmap))
287 return PTR_ERR(wm8728->regmap);
289 i2c_set_clientdata(i2c, wm8728);
291 ret = devm_snd_soc_register_component(&i2c->dev,
292 &soc_component_dev_wm8728, &wm8728_dai, 1);
297 static const struct i2c_device_id wm8728_i2c_id[] = {
301 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
303 static struct i2c_driver wm8728_i2c_driver = {
306 .of_match_table = wm8728_of_match,
308 .probe = wm8728_i2c_probe,
309 .id_table = wm8728_i2c_id,
313 static int __init wm8728_modinit(void)
316 #if IS_ENABLED(CONFIG_I2C)
317 ret = i2c_add_driver(&wm8728_i2c_driver);
319 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
323 #if defined(CONFIG_SPI_MASTER)
324 ret = spi_register_driver(&wm8728_spi_driver);
326 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
332 module_init(wm8728_modinit);
334 static void __exit wm8728_exit(void)
336 #if IS_ENABLED(CONFIG_I2C)
337 i2c_del_driver(&wm8728_i2c_driver);
339 #if defined(CONFIG_SPI_MASTER)
340 spi_unregister_driver(&wm8728_spi_driver);
343 module_exit(wm8728_exit);
345 MODULE_DESCRIPTION("ASoC WM8728 driver");
347 MODULE_LICENSE("GPL");