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 <linux/of_device.h>
23 #include <sound/core.h>
24 #include <sound/pcm.h>
25 #include <sound/pcm_params.h>
26 #include <sound/soc.h>
27 #include <sound/initval.h>
28 #include <sound/tlv.h>
33 * We can't read the WM8728 register space so we cache them instead.
34 * Note that the defaults here aren't the physical defaults, we latch
35 * the volume update bits, mute the output and enable infinite zero
38 static const u16 wm8728_reg_defaults[] = {
45 /* codec private data */
47 enum snd_soc_control_type control_type;
50 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
52 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
54 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
55 0, 255, 0, wm8728_tlv),
57 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
63 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
64 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
65 SND_SOC_DAPM_OUTPUT("VOUTL"),
66 SND_SOC_DAPM_OUTPUT("VOUTR"),
69 static const struct snd_soc_dapm_route wm8728_intercon[] = {
70 {"VOUTL", NULL, "DAC"},
71 {"VOUTR", NULL, "DAC"},
74 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
76 struct snd_soc_codec *codec = dai->codec;
77 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
80 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
82 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
87 static int wm8728_hw_params(struct snd_pcm_substream *substream,
88 struct snd_pcm_hw_params *params,
89 struct snd_soc_dai *dai)
91 struct snd_soc_pcm_runtime *rtd = substream->private_data;
92 struct snd_soc_codec *codec = rtd->codec;
93 u16 dac = snd_soc_read(codec, WM8728_DACCTL);
97 switch (params_format(params)) {
98 case SNDRV_PCM_FORMAT_S16_LE:
100 case SNDRV_PCM_FORMAT_S20_3LE:
103 case SNDRV_PCM_FORMAT_S24_LE:
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)
170 case SND_SOC_BIAS_ON:
171 case SND_SOC_BIAS_PREPARE:
172 case SND_SOC_BIAS_STANDBY:
173 if (codec->dapm.bias_level == 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 for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
180 snd_soc_write(codec, i,
181 snd_soc_read(codec, i));
185 case SND_SOC_BIAS_OFF:
186 reg = snd_soc_read(codec, WM8728_DACCTL);
187 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
190 codec->dapm.bias_level = level;
194 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
196 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
197 SNDRV_PCM_FMTBIT_S24_LE)
199 static struct snd_soc_dai_ops wm8728_dai_ops = {
200 .hw_params = wm8728_hw_params,
201 .digital_mute = wm8728_mute,
202 .set_fmt = wm8728_set_dai_fmt,
205 static struct snd_soc_dai_driver wm8728_dai = {
206 .name = "wm8728-hifi",
208 .stream_name = "Playback",
211 .rates = WM8728_RATES,
212 .formats = WM8728_FORMATS,
214 .ops = &wm8728_dai_ops,
217 static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state)
219 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
224 static int wm8728_resume(struct snd_soc_codec *codec)
226 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
231 static int wm8728_probe(struct snd_soc_codec *codec)
233 struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
236 ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type);
238 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
243 /* power on device */
244 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
246 snd_soc_add_controls(codec, wm8728_snd_controls,
247 ARRAY_SIZE(wm8728_snd_controls));
252 static int wm8728_remove(struct snd_soc_codec *codec)
254 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
258 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
259 .probe = wm8728_probe,
260 .remove = wm8728_remove,
261 .suspend = wm8728_suspend,
262 .resume = wm8728_resume,
263 .set_bias_level = wm8728_set_bias_level,
264 .reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults),
265 .reg_word_size = sizeof(u16),
266 .reg_cache_default = wm8728_reg_defaults,
267 .dapm_widgets = wm8728_dapm_widgets,
268 .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
269 .dapm_routes = wm8728_intercon,
270 .num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
273 static const struct of_device_id wm8728_of_match[] = {
274 { .compatible = "wlf,wm8728", },
277 MODULE_DEVICE_TABLE(of, wm8728_of_match);
279 #if defined(CONFIG_SPI_MASTER)
280 static int __devinit wm8728_spi_probe(struct spi_device *spi)
282 struct wm8728_priv *wm8728;
285 wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
289 wm8728->control_type = SND_SOC_SPI;
290 spi_set_drvdata(spi, wm8728);
292 ret = snd_soc_register_codec(&spi->dev,
293 &soc_codec_dev_wm8728, &wm8728_dai, 1);
299 static int __devexit wm8728_spi_remove(struct spi_device *spi)
301 snd_soc_unregister_codec(&spi->dev);
302 kfree(spi_get_drvdata(spi));
306 static struct spi_driver wm8728_spi_driver = {
309 .owner = THIS_MODULE,
310 .of_match_table = wm8728_of_match,
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 = {
354 .owner = THIS_MODULE,
355 .of_match_table = wm8728_of_match,
357 .probe = wm8728_i2c_probe,
358 .remove = __devexit_p(wm8728_i2c_remove),
359 .id_table = wm8728_i2c_id,
363 static int __init wm8728_modinit(void)
366 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
367 ret = i2c_add_driver(&wm8728_i2c_driver);
369 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
373 #if defined(CONFIG_SPI_MASTER)
374 ret = spi_register_driver(&wm8728_spi_driver);
376 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
382 module_init(wm8728_modinit);
384 static void __exit wm8728_exit(void)
386 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
387 i2c_del_driver(&wm8728_i2c_driver);
389 #if defined(CONFIG_SPI_MASTER)
390 spi_unregister_driver(&wm8728_spi_driver);
393 module_exit(wm8728_exit);
395 MODULE_DESCRIPTION("ASoC WM8728 driver");
396 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
397 MODULE_LICENSE("GPL");