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/soc-dapm.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;
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 intercon[] = {
71 {"VOUTL", NULL, "DAC"},
72 {"VOUTR", NULL, "DAC"},
75 static int wm8728_add_widgets(struct snd_soc_codec *codec)
77 snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets,
78 ARRAY_SIZE(wm8728_dapm_widgets));
80 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
85 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
87 struct snd_soc_codec *codec = dai->codec;
88 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
91 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
93 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
98 static int wm8728_hw_params(struct snd_pcm_substream *substream,
99 struct snd_pcm_hw_params *params,
100 struct snd_soc_dai *dai)
102 struct snd_soc_pcm_runtime *rtd = substream->private_data;
103 struct snd_soc_codec *codec = rtd->codec;
104 u16 dac = snd_soc_read(codec, WM8728_DACCTL);
108 switch (params_format(params)) {
109 case SNDRV_PCM_FORMAT_S16_LE:
111 case SNDRV_PCM_FORMAT_S20_3LE:
114 case SNDRV_PCM_FORMAT_S24_LE:
121 snd_soc_write(codec, WM8728_DACCTL, dac);
126 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
129 struct snd_soc_codec *codec = codec_dai->codec;
130 u16 iface = snd_soc_read(codec, WM8728_IFCTL);
132 /* Currently only I2S is supported by the driver, though the
133 * hardware is more flexible.
135 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
136 case SND_SOC_DAIFMT_I2S:
143 /* The hardware only support full slave mode */
144 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
145 case SND_SOC_DAIFMT_CBS_CFS:
151 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
152 case SND_SOC_DAIFMT_NB_NF:
155 case SND_SOC_DAIFMT_IB_NF:
159 case SND_SOC_DAIFMT_NB_IF:
163 case SND_SOC_DAIFMT_IB_IF:
170 snd_soc_write(codec, WM8728_IFCTL, iface);
174 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
175 enum snd_soc_bias_level level)
181 case SND_SOC_BIAS_ON:
182 case SND_SOC_BIAS_PREPARE:
183 case SND_SOC_BIAS_STANDBY:
184 if (codec->bias_level == SND_SOC_BIAS_OFF) {
185 /* Power everything up... */
186 reg = snd_soc_read(codec, WM8728_DACCTL);
187 snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
189 /* ..then sync in the register cache. */
190 for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
191 snd_soc_write(codec, i,
192 snd_soc_read(codec, i));
196 case SND_SOC_BIAS_OFF:
197 reg = snd_soc_read(codec, WM8728_DACCTL);
198 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
201 codec->bias_level = level;
205 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
207 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
208 SNDRV_PCM_FMTBIT_S24_LE)
210 static struct snd_soc_dai_ops wm8728_dai_ops = {
211 .hw_params = wm8728_hw_params,
212 .digital_mute = wm8728_mute,
213 .set_fmt = wm8728_set_dai_fmt,
216 static struct snd_soc_dai_driver wm8728_dai = {
217 .name = "wm8728-hifi",
219 .stream_name = "Playback",
222 .rates = WM8728_RATES,
223 .formats = WM8728_FORMATS,
225 .ops = &wm8728_dai_ops,
228 static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state)
230 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
235 static int wm8728_resume(struct snd_soc_codec *codec)
237 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
242 static int wm8728_probe(struct snd_soc_codec *codec)
244 struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
247 codec->control_data = wm8728->control_data;
248 ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type);
250 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
255 /* power on device */
256 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
258 snd_soc_add_controls(codec, wm8728_snd_controls,
259 ARRAY_SIZE(wm8728_snd_controls));
260 wm8728_add_widgets(codec);
265 static int wm8728_remove(struct snd_soc_codec *codec)
267 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
271 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
272 .probe = wm8728_probe,
273 .remove = wm8728_remove,
274 .suspend = wm8728_suspend,
275 .resume = wm8728_resume,
276 .set_bias_level = wm8728_set_bias_level,
277 .reg_cache_size = sizeof(wm8728_reg_defaults),
278 .reg_word_size = sizeof(u16),
279 .reg_cache_default = wm8728_reg_defaults,
282 #if defined(CONFIG_SPI_MASTER)
283 static int __devinit wm8728_spi_probe(struct spi_device *spi)
285 struct wm8728_priv *wm8728;
288 wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
292 wm8728->control_data = spi;
293 wm8728->control_type = SND_SOC_SPI;
294 spi_set_drvdata(spi, wm8728);
296 ret = snd_soc_register_codec(&spi->dev,
297 &soc_codec_dev_wm8728, &wm8728_dai, 1);
303 static int __devexit wm8728_spi_remove(struct spi_device *spi)
305 snd_soc_unregister_codec(&spi->dev);
306 kfree(spi_get_drvdata(spi));
310 static struct spi_driver wm8728_spi_driver = {
312 .name = "wm8728-codec",
313 .bus = &spi_bus_type,
314 .owner = THIS_MODULE,
316 .probe = wm8728_spi_probe,
317 .remove = __devexit_p(wm8728_spi_remove),
319 #endif /* CONFIG_SPI_MASTER */
321 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
322 static __devinit int wm8728_i2c_probe(struct i2c_client *i2c,
323 const struct i2c_device_id *id)
325 struct wm8728_priv *wm8728;
328 wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
332 i2c_set_clientdata(i2c, wm8728);
333 wm8728->control_data = i2c;
334 wm8728->control_type = SND_SOC_I2C;
336 ret = snd_soc_register_codec(&i2c->dev,
337 &soc_codec_dev_wm8728, &wm8728_dai, 1);
343 static __devexit int wm8728_i2c_remove(struct i2c_client *client)
345 snd_soc_unregister_codec(&client->dev);
346 kfree(i2c_get_clientdata(client));
350 static const struct i2c_device_id wm8728_i2c_id[] = {
354 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
356 static struct i2c_driver wm8728_i2c_driver = {
358 .name = "wm8728-codec",
359 .owner = THIS_MODULE,
361 .probe = wm8728_i2c_probe,
362 .remove = __devexit_p(wm8728_i2c_remove),
363 .id_table = wm8728_i2c_id,
367 static int __init wm8728_modinit(void)
370 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
371 ret = i2c_add_driver(&wm8728_i2c_driver);
373 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
377 #if defined(CONFIG_SPI_MASTER)
378 ret = spi_register_driver(&wm8728_spi_driver);
380 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
386 module_init(wm8728_modinit);
388 static void __exit wm8728_exit(void)
390 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
391 i2c_del_driver(&wm8728_i2c_driver);
393 #if defined(CONFIG_SPI_MASTER)
394 spi_unregister_driver(&wm8728_spi_driver);
397 module_exit(wm8728_exit);
399 MODULE_DESCRIPTION("ASoC WM8728 driver");
400 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
401 MODULE_LICENSE("GPL");