tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * wm8728.c -- WM8728 ALSA SoC Audio driver
3 *
4 * Copyright 2008 Wolfson Microelectronics plc
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
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.
11 */
12
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/init.h>
16#include <linux/delay.h>
17#include <linux/pm.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>
29
30#include "wm8728.h"
31
32/*
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
36 * detect.
37 */
38static const u16 wm8728_reg_defaults[] = {
39 0x1ff,
40 0x1ff,
41 0x001,
42 0x100,
43};
44
45/* codec private data */
46struct wm8728_priv {
47 enum snd_soc_control_type control_type;
48};
49
50static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
51
52static const struct snd_kcontrol_new wm8728_snd_controls[] = {
53
54SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
55 0, 255, 0, wm8728_tlv),
56
57SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
58};
59
60/*
61 * DAPM controls.
62 */
63static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
64SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
65SND_SOC_DAPM_OUTPUT("VOUTL"),
66SND_SOC_DAPM_OUTPUT("VOUTR"),
67};
68
69static const struct snd_soc_dapm_route wm8728_intercon[] = {
70 {"VOUTL", NULL, "DAC"},
71 {"VOUTR", NULL, "DAC"},
72};
73
74static int wm8728_mute(struct snd_soc_dai *dai, int mute)
75{
76 struct snd_soc_codec *codec = dai->codec;
77 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
78
79 if (mute)
80 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
81 else
82 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
83
84 return 0;
85}
86
87static int wm8728_hw_params(struct snd_pcm_substream *substream,
88 struct snd_pcm_hw_params *params,
89 struct snd_soc_dai *dai)
90{
91 struct snd_soc_codec *codec = dai->codec;
92 u16 dac = snd_soc_read(codec, WM8728_DACCTL);
93
94 dac &= ~0x18;
95
96 switch (params_format(params)) {
97 case SNDRV_PCM_FORMAT_S16_LE:
98 break;
99 case SNDRV_PCM_FORMAT_S20_3LE:
100 dac |= 0x10;
101 break;
102 case SNDRV_PCM_FORMAT_S24_LE:
103 dac |= 0x08;
104 break;
105 default:
106 return -EINVAL;
107 }
108
109 snd_soc_write(codec, WM8728_DACCTL, dac);
110
111 return 0;
112}
113
114static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
115 unsigned int fmt)
116{
117 struct snd_soc_codec *codec = codec_dai->codec;
118 u16 iface = snd_soc_read(codec, WM8728_IFCTL);
119
120 /* Currently only I2S is supported by the driver, though the
121 * hardware is more flexible.
122 */
123 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
124 case SND_SOC_DAIFMT_I2S:
125 iface |= 1;
126 break;
127 default:
128 return -EINVAL;
129 }
130
131 /* The hardware only support full slave mode */
132 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
133 case SND_SOC_DAIFMT_CBS_CFS:
134 break;
135 default:
136 return -EINVAL;
137 }
138
139 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
140 case SND_SOC_DAIFMT_NB_NF:
141 iface &= ~0x22;
142 break;
143 case SND_SOC_DAIFMT_IB_NF:
144 iface |= 0x20;
145 iface &= ~0x02;
146 break;
147 case SND_SOC_DAIFMT_NB_IF:
148 iface |= 0x02;
149 iface &= ~0x20;
150 break;
151 case SND_SOC_DAIFMT_IB_IF:
152 iface |= 0x22;
153 break;
154 default:
155 return -EINVAL;
156 }
157
158 snd_soc_write(codec, WM8728_IFCTL, iface);
159 return 0;
160}
161
162static int wm8728_set_bias_level(struct snd_soc_codec *codec,
163 enum snd_soc_bias_level level)
164{
165 u16 reg;
166 int i;
167
168 switch (level) {
169 case SND_SOC_BIAS_ON:
170 case SND_SOC_BIAS_PREPARE:
171 case SND_SOC_BIAS_STANDBY:
172 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
173 /* Power everything up... */
174 reg = snd_soc_read(codec, WM8728_DACCTL);
175 snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
176
177 /* ..then sync in the register cache. */
178 for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
179 snd_soc_write(codec, i,
180 snd_soc_read(codec, i));
181 }
182 break;
183
184 case SND_SOC_BIAS_OFF:
185 reg = snd_soc_read(codec, WM8728_DACCTL);
186 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
187 break;
188 }
189 codec->dapm.bias_level = level;
190 return 0;
191}
192
193#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
194
195#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
196 SNDRV_PCM_FMTBIT_S24_LE)
197
198static const struct snd_soc_dai_ops wm8728_dai_ops = {
199 .hw_params = wm8728_hw_params,
200 .digital_mute = wm8728_mute,
201 .set_fmt = wm8728_set_dai_fmt,
202};
203
204static struct snd_soc_dai_driver wm8728_dai = {
205 .name = "wm8728-hifi",
206 .playback = {
207 .stream_name = "Playback",
208 .channels_min = 2,
209 .channels_max = 2,
210 .rates = WM8728_RATES,
211 .formats = WM8728_FORMATS,
212 },
213 .ops = &wm8728_dai_ops,
214};
215
216static int wm8728_suspend(struct snd_soc_codec *codec)
217{
218 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
219
220 return 0;
221}
222
223static int wm8728_resume(struct snd_soc_codec *codec)
224{
225 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
226
227 return 0;
228}
229
230static int wm8728_probe(struct snd_soc_codec *codec)
231{
232 struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
233 int ret;
234
235 ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type);
236 if (ret < 0) {
237 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
238 ret);
239 return ret;
240 }
241
242 /* power on device */
243 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
244
245 return ret;
246}
247
248static int wm8728_remove(struct snd_soc_codec *codec)
249{
250 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
251 return 0;
252}
253
254static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
255 .probe = wm8728_probe,
256 .remove = wm8728_remove,
257 .suspend = wm8728_suspend,
258 .resume = wm8728_resume,
259 .set_bias_level = wm8728_set_bias_level,
260 .reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults),
261 .reg_word_size = sizeof(u16),
262 .reg_cache_default = wm8728_reg_defaults,
263 .controls = wm8728_snd_controls,
264 .num_controls = ARRAY_SIZE(wm8728_snd_controls),
265 .dapm_widgets = wm8728_dapm_widgets,
266 .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
267 .dapm_routes = wm8728_intercon,
268 .num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
269};
270
271static const struct of_device_id wm8728_of_match[] = {
272 { .compatible = "wlf,wm8728", },
273 { }
274};
275MODULE_DEVICE_TABLE(of, wm8728_of_match);
276
277#if defined(CONFIG_SPI_MASTER)
278static int __devinit wm8728_spi_probe(struct spi_device *spi)
279{
280 struct wm8728_priv *wm8728;
281 int ret;
282
283 wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
284 if (wm8728 == NULL)
285 return -ENOMEM;
286
287 wm8728->control_type = SND_SOC_SPI;
288 spi_set_drvdata(spi, wm8728);
289
290 ret = snd_soc_register_codec(&spi->dev,
291 &soc_codec_dev_wm8728, &wm8728_dai, 1);
292 if (ret < 0)
293 kfree(wm8728);
294 return ret;
295}
296
297static int __devexit wm8728_spi_remove(struct spi_device *spi)
298{
299 snd_soc_unregister_codec(&spi->dev);
300 kfree(spi_get_drvdata(spi));
301 return 0;
302}
303
304static struct spi_driver wm8728_spi_driver = {
305 .driver = {
306 .name = "wm8728",
307 .owner = THIS_MODULE,
308 .of_match_table = wm8728_of_match,
309 },
310 .probe = wm8728_spi_probe,
311 .remove = __devexit_p(wm8728_spi_remove),
312};
313#endif /* CONFIG_SPI_MASTER */
314
315#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
316static __devinit int wm8728_i2c_probe(struct i2c_client *i2c,
317 const struct i2c_device_id *id)
318{
319 struct wm8728_priv *wm8728;
320 int ret;
321
322 wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
323 if (wm8728 == NULL)
324 return -ENOMEM;
325
326 i2c_set_clientdata(i2c, wm8728);
327 wm8728->control_type = SND_SOC_I2C;
328
329 ret = snd_soc_register_codec(&i2c->dev,
330 &soc_codec_dev_wm8728, &wm8728_dai, 1);
331 if (ret < 0)
332 kfree(wm8728);
333 return ret;
334}
335
336static __devexit int wm8728_i2c_remove(struct i2c_client *client)
337{
338 snd_soc_unregister_codec(&client->dev);
339 kfree(i2c_get_clientdata(client));
340 return 0;
341}
342
343static const struct i2c_device_id wm8728_i2c_id[] = {
344 { "wm8728", 0 },
345 { }
346};
347MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
348
349static struct i2c_driver wm8728_i2c_driver = {
350 .driver = {
351 .name = "wm8728",
352 .owner = THIS_MODULE,
353 .of_match_table = wm8728_of_match,
354 },
355 .probe = wm8728_i2c_probe,
356 .remove = __devexit_p(wm8728_i2c_remove),
357 .id_table = wm8728_i2c_id,
358};
359#endif
360
361static int __init wm8728_modinit(void)
362{
363 int ret = 0;
364#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
365 ret = i2c_add_driver(&wm8728_i2c_driver);
366 if (ret != 0) {
367 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
368 ret);
369 }
370#endif
371#if defined(CONFIG_SPI_MASTER)
372 ret = spi_register_driver(&wm8728_spi_driver);
373 if (ret != 0) {
374 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
375 ret);
376 }
377#endif
378 return ret;
379}
380module_init(wm8728_modinit);
381
382static void __exit wm8728_exit(void)
383{
384#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
385 i2c_del_driver(&wm8728_i2c_driver);
386#endif
387#if defined(CONFIG_SPI_MASTER)
388 spi_unregister_driver(&wm8728_spi_driver);
389#endif
390}
391module_exit(wm8728_exit);
392
393MODULE_DESCRIPTION("ASoC WM8728 driver");
394MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
395MODULE_LICENSE("GPL");