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/spi/spi.h>
21 #include <linux/slab.h>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25 #include <sound/soc.h>
26 #include <sound/initval.h>
27 #include <sound/tlv.h>
32 * We can't read the WM8728 register space so we cache them instead.
33 * Note that the defaults here aren't the physical defaults, we latch
34 * the volume update bits, mute the output and enable infinite zero
37 static const u16 wm8728_reg_defaults[] = {
44 /* codec private data */
46 enum snd_soc_control_type control_type;
49 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
51 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
53 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
54 0, 255, 0, wm8728_tlv),
56 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
62 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
63 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
64 SND_SOC_DAPM_OUTPUT("VOUTL"),
65 SND_SOC_DAPM_OUTPUT("VOUTR"),
68 static const struct snd_soc_dapm_route intercon[] = {
69 {"VOUTL", NULL, "DAC"},
70 {"VOUTR", NULL, "DAC"},
73 static int wm8728_add_widgets(struct snd_soc_codec *codec)
75 struct snd_soc_dapm_context *dapm = &codec->dapm;
77 snd_soc_dapm_new_controls(dapm, wm8728_dapm_widgets,
78 ARRAY_SIZE(wm8728_dapm_widgets));
79 snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
84 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
86 struct snd_soc_codec *codec = dai->codec;
87 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
90 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
92 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
97 static int wm8728_hw_params(struct snd_pcm_substream *substream,
98 struct snd_pcm_hw_params *params,
99 struct snd_soc_dai *dai)
101 struct snd_soc_pcm_runtime *rtd = substream->private_data;
102 struct snd_soc_codec *codec = rtd->codec;
103 u16 dac = snd_soc_read(codec, WM8728_DACCTL);
107 switch (params_format(params)) {
108 case SNDRV_PCM_FORMAT_S16_LE:
110 case SNDRV_PCM_FORMAT_S20_3LE:
113 case SNDRV_PCM_FORMAT_S24_LE:
120 snd_soc_write(codec, WM8728_DACCTL, dac);
125 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
128 struct snd_soc_codec *codec = codec_dai->codec;
129 u16 iface = snd_soc_read(codec, WM8728_IFCTL);
131 /* Currently only I2S is supported by the driver, though the
132 * hardware is more flexible.
134 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
135 case SND_SOC_DAIFMT_I2S:
142 /* The hardware only support full slave mode */
143 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
144 case SND_SOC_DAIFMT_CBS_CFS:
150 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
151 case SND_SOC_DAIFMT_NB_NF:
154 case SND_SOC_DAIFMT_IB_NF:
158 case SND_SOC_DAIFMT_NB_IF:
162 case SND_SOC_DAIFMT_IB_IF:
169 snd_soc_write(codec, WM8728_IFCTL, iface);
173 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
174 enum snd_soc_bias_level level)
180 case SND_SOC_BIAS_ON:
181 case SND_SOC_BIAS_PREPARE:
182 case SND_SOC_BIAS_STANDBY:
183 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
184 /* Power everything up... */
185 reg = snd_soc_read(codec, WM8728_DACCTL);
186 snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
188 /* ..then sync in the register cache. */
189 for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
190 snd_soc_write(codec, i,
191 snd_soc_read(codec, i));
195 case SND_SOC_BIAS_OFF:
196 reg = snd_soc_read(codec, WM8728_DACCTL);
197 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
200 codec->dapm.bias_level = level;
204 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
206 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
207 SNDRV_PCM_FMTBIT_S24_LE)
209 static struct snd_soc_dai_ops wm8728_dai_ops = {
210 .hw_params = wm8728_hw_params,
211 .digital_mute = wm8728_mute,
212 .set_fmt = wm8728_set_dai_fmt,
215 static struct snd_soc_dai_driver wm8728_dai = {
216 .name = "wm8728-hifi",
218 .stream_name = "Playback",
221 .rates = WM8728_RATES,
222 .formats = WM8728_FORMATS,
224 .ops = &wm8728_dai_ops,
227 static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state)
229 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
234 static int wm8728_resume(struct snd_soc_codec *codec)
236 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
241 static int wm8728_probe(struct snd_soc_codec *codec)
243 struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
246 ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type);
248 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
253 /* power on device */
254 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
256 snd_soc_add_controls(codec, wm8728_snd_controls,
257 ARRAY_SIZE(wm8728_snd_controls));
258 wm8728_add_widgets(codec);
263 static int wm8728_remove(struct snd_soc_codec *codec)
265 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
269 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
270 .probe = wm8728_probe,
271 .remove = wm8728_remove,
272 .suspend = wm8728_suspend,
273 .resume = wm8728_resume,
274 .set_bias_level = wm8728_set_bias_level,
275 .reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults),
276 .reg_word_size = sizeof(u16),
277 .reg_cache_default = wm8728_reg_defaults,
280 #if defined(CONFIG_SPI_MASTER)
281 static int __devinit wm8728_spi_probe(struct spi_device *spi)
283 struct wm8728_priv *wm8728;
286 wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
290 wm8728->control_type = SND_SOC_SPI;
291 spi_set_drvdata(spi, wm8728);
293 ret = snd_soc_register_codec(&spi->dev,
294 &soc_codec_dev_wm8728, &wm8728_dai, 1);
300 static int __devexit wm8728_spi_remove(struct spi_device *spi)
302 snd_soc_unregister_codec(&spi->dev);
303 kfree(spi_get_drvdata(spi));
307 static struct spi_driver wm8728_spi_driver = {
309 .name = "wm8728-codec",
310 .owner = THIS_MODULE,
312 .probe = wm8728_spi_probe,
313 .remove = __devexit_p(wm8728_spi_remove),
315 #endif /* CONFIG_SPI_MASTER */
317 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
318 static __devinit int wm8728_i2c_probe(struct i2c_client *i2c,
319 const struct i2c_device_id *id)
321 struct wm8728_priv *wm8728;
324 wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
328 i2c_set_clientdata(i2c, wm8728);
329 wm8728->control_type = SND_SOC_I2C;
331 ret = snd_soc_register_codec(&i2c->dev,
332 &soc_codec_dev_wm8728, &wm8728_dai, 1);
338 static __devexit int wm8728_i2c_remove(struct i2c_client *client)
340 snd_soc_unregister_codec(&client->dev);
341 kfree(i2c_get_clientdata(client));
345 static const struct i2c_device_id wm8728_i2c_id[] = {
349 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
351 static struct i2c_driver wm8728_i2c_driver = {
353 .name = "wm8728-codec",
354 .owner = THIS_MODULE,
356 .probe = wm8728_i2c_probe,
357 .remove = __devexit_p(wm8728_i2c_remove),
358 .id_table = wm8728_i2c_id,
362 static int __init wm8728_modinit(void)
365 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
366 ret = i2c_add_driver(&wm8728_i2c_driver);
368 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
372 #if defined(CONFIG_SPI_MASTER)
373 ret = spi_register_driver(&wm8728_spi_driver);
375 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
381 module_init(wm8728_modinit);
383 static void __exit wm8728_exit(void)
385 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
386 i2c_del_driver(&wm8728_i2c_driver);
388 #if defined(CONFIG_SPI_MASTER)
389 spi_unregister_driver(&wm8728_spi_driver);
392 module_exit(wm8728_exit);
394 MODULE_DESCRIPTION("ASoC WM8728 driver");
395 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
396 MODULE_LICENSE("GPL");