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/regmap.h>
21 #include <linux/spi/spi.h>
22 #include <linux/slab.h>
23 #include <linux/of_device.h>
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27 #include <sound/soc.h>
28 #include <sound/initval.h>
29 #include <sound/tlv.h>
30
31 #include "wm8728.h"
32
33 /*
34 * We can't read the WM8728 register space so we cache them instead.
35 * Note that the defaults here aren't the physical defaults, we latch
36 * the volume update bits, mute the output and enable infinite zero
37 * detect.
38 */
39 static const struct reg_default wm8728_reg_defaults[] = {
40 { 0, 0x1ff },
41 { 1, 0x1ff },
42 { 2, 0x001 },
43 { 3, 0x100 },
44 };
45
46 /* codec private data */
47 struct wm8728_priv {
48 struct regmap *regmap;
49 };
50
51 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
52
53 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
54
55 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
56 0, 255, 0, wm8728_tlv),
57
58 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
59 };
60
61 /*
62 * DAPM controls.
63 */
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"),
68 };
69
70 static const struct snd_soc_dapm_route wm8728_intercon[] = {
71 {"VOUTL", NULL, "DAC"},
72 {"VOUTR", NULL, "DAC"},
73 };
74
wm8728_mute(struct snd_soc_dai * dai,int mute)75 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
76 {
77 struct snd_soc_codec *codec = dai->codec;
78 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
79
80 if (mute)
81 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
82 else
83 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
84
85 return 0;
86 }
87
wm8728_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)88 static int wm8728_hw_params(struct snd_pcm_substream *substream,
89 struct snd_pcm_hw_params *params,
90 struct snd_soc_dai *dai)
91 {
92 struct snd_soc_codec *codec = dai->codec;
93 u16 dac = snd_soc_read(codec, WM8728_DACCTL);
94
95 dac &= ~0x18;
96
97 switch (params_width(params)) {
98 case 16:
99 break;
100 case 20:
101 dac |= 0x10;
102 break;
103 case 24:
104 dac |= 0x08;
105 break;
106 default:
107 return -EINVAL;
108 }
109
110 snd_soc_write(codec, WM8728_DACCTL, dac);
111
112 return 0;
113 }
114
wm8728_set_dai_fmt(struct snd_soc_dai * codec_dai,unsigned int fmt)115 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
116 unsigned int fmt)
117 {
118 struct snd_soc_codec *codec = codec_dai->codec;
119 u16 iface = snd_soc_read(codec, WM8728_IFCTL);
120
121 /* Currently only I2S is supported by the driver, though the
122 * hardware is more flexible.
123 */
124 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
125 case SND_SOC_DAIFMT_I2S:
126 iface |= 1;
127 break;
128 default:
129 return -EINVAL;
130 }
131
132 /* The hardware only support full slave mode */
133 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
134 case SND_SOC_DAIFMT_CBS_CFS:
135 break;
136 default:
137 return -EINVAL;
138 }
139
140 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
141 case SND_SOC_DAIFMT_NB_NF:
142 iface &= ~0x22;
143 break;
144 case SND_SOC_DAIFMT_IB_NF:
145 iface |= 0x20;
146 iface &= ~0x02;
147 break;
148 case SND_SOC_DAIFMT_NB_IF:
149 iface |= 0x02;
150 iface &= ~0x20;
151 break;
152 case SND_SOC_DAIFMT_IB_IF:
153 iface |= 0x22;
154 break;
155 default:
156 return -EINVAL;
157 }
158
159 snd_soc_write(codec, WM8728_IFCTL, iface);
160 return 0;
161 }
162
wm8728_set_bias_level(struct snd_soc_codec * codec,enum snd_soc_bias_level level)163 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
164 enum snd_soc_bias_level level)
165 {
166 struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
167 u16 reg;
168
169 switch (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);
177
178 /* ..then sync in the register cache. */
179 regcache_sync(wm8728->regmap);
180 }
181 break;
182
183 case SND_SOC_BIAS_OFF:
184 reg = snd_soc_read(codec, WM8728_DACCTL);
185 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
186 break;
187 }
188 codec->dapm.bias_level = level;
189 return 0;
190 }
191
192 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
193
194 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
195 SNDRV_PCM_FMTBIT_S24_LE)
196
197 static const struct snd_soc_dai_ops wm8728_dai_ops = {
198 .hw_params = wm8728_hw_params,
199 .digital_mute = wm8728_mute,
200 .set_fmt = wm8728_set_dai_fmt,
201 };
202
203 static struct snd_soc_dai_driver wm8728_dai = {
204 .name = "wm8728-hifi",
205 .playback = {
206 .stream_name = "Playback",
207 .channels_min = 2,
208 .channels_max = 2,
209 .rates = WM8728_RATES,
210 .formats = WM8728_FORMATS,
211 },
212 .ops = &wm8728_dai_ops,
213 };
214
wm8728_suspend(struct snd_soc_codec * codec)215 static int wm8728_suspend(struct snd_soc_codec *codec)
216 {
217 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
218
219 return 0;
220 }
221
wm8728_resume(struct snd_soc_codec * codec)222 static int wm8728_resume(struct snd_soc_codec *codec)
223 {
224 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
225
226 return 0;
227 }
228
wm8728_probe(struct snd_soc_codec * codec)229 static int wm8728_probe(struct snd_soc_codec *codec)
230 {
231 /* power on device */
232 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
233
234 return 0;
235 }
236
wm8728_remove(struct snd_soc_codec * codec)237 static int wm8728_remove(struct snd_soc_codec *codec)
238 {
239 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
240 return 0;
241 }
242
243 static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
244 .probe = wm8728_probe,
245 .remove = wm8728_remove,
246 .suspend = wm8728_suspend,
247 .resume = wm8728_resume,
248 .set_bias_level = wm8728_set_bias_level,
249 .controls = wm8728_snd_controls,
250 .num_controls = ARRAY_SIZE(wm8728_snd_controls),
251 .dapm_widgets = wm8728_dapm_widgets,
252 .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
253 .dapm_routes = wm8728_intercon,
254 .num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
255 };
256
257 static const struct of_device_id wm8728_of_match[] = {
258 { .compatible = "wlf,wm8728", },
259 { }
260 };
261 MODULE_DEVICE_TABLE(of, wm8728_of_match);
262
263 static const struct regmap_config wm8728_regmap = {
264 .reg_bits = 7,
265 .val_bits = 9,
266 .max_register = WM8728_IFCTL,
267
268 .reg_defaults = wm8728_reg_defaults,
269 .num_reg_defaults = ARRAY_SIZE(wm8728_reg_defaults),
270 .cache_type = REGCACHE_RBTREE,
271 };
272
273 #if defined(CONFIG_SPI_MASTER)
wm8728_spi_probe(struct spi_device * spi)274 static int wm8728_spi_probe(struct spi_device *spi)
275 {
276 struct wm8728_priv *wm8728;
277 int ret;
278
279 wm8728 = devm_kzalloc(&spi->dev, sizeof(struct wm8728_priv),
280 GFP_KERNEL);
281 if (wm8728 == NULL)
282 return -ENOMEM;
283
284 wm8728->regmap = devm_regmap_init_spi(spi, &wm8728_regmap);
285 if (IS_ERR(wm8728->regmap))
286 return PTR_ERR(wm8728->regmap);
287
288 spi_set_drvdata(spi, wm8728);
289
290 ret = snd_soc_register_codec(&spi->dev,
291 &soc_codec_dev_wm8728, &wm8728_dai, 1);
292
293 return ret;
294 }
295
wm8728_spi_remove(struct spi_device * spi)296 static int wm8728_spi_remove(struct spi_device *spi)
297 {
298 snd_soc_unregister_codec(&spi->dev);
299
300 return 0;
301 }
302
303 static struct spi_driver wm8728_spi_driver = {
304 .driver = {
305 .name = "wm8728",
306 .owner = THIS_MODULE,
307 .of_match_table = wm8728_of_match,
308 },
309 .probe = wm8728_spi_probe,
310 .remove = wm8728_spi_remove,
311 };
312 #endif /* CONFIG_SPI_MASTER */
313
314 #if IS_ENABLED(CONFIG_I2C)
wm8728_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)315 static int wm8728_i2c_probe(struct i2c_client *i2c,
316 const struct i2c_device_id *id)
317 {
318 struct wm8728_priv *wm8728;
319 int ret;
320
321 wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv),
322 GFP_KERNEL);
323 if (wm8728 == NULL)
324 return -ENOMEM;
325
326 wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap);
327 if (IS_ERR(wm8728->regmap))
328 return PTR_ERR(wm8728->regmap);
329
330 i2c_set_clientdata(i2c, wm8728);
331
332 ret = snd_soc_register_codec(&i2c->dev,
333 &soc_codec_dev_wm8728, &wm8728_dai, 1);
334
335 return ret;
336 }
337
wm8728_i2c_remove(struct i2c_client * client)338 static int wm8728_i2c_remove(struct i2c_client *client)
339 {
340 snd_soc_unregister_codec(&client->dev);
341 return 0;
342 }
343
344 static const struct i2c_device_id wm8728_i2c_id[] = {
345 { "wm8728", 0 },
346 { }
347 };
348 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
349
350 static struct i2c_driver wm8728_i2c_driver = {
351 .driver = {
352 .name = "wm8728",
353 .owner = THIS_MODULE,
354 .of_match_table = wm8728_of_match,
355 },
356 .probe = wm8728_i2c_probe,
357 .remove = wm8728_i2c_remove,
358 .id_table = wm8728_i2c_id,
359 };
360 #endif
361
wm8728_modinit(void)362 static int __init wm8728_modinit(void)
363 {
364 int ret = 0;
365 #if IS_ENABLED(CONFIG_I2C)
366 ret = i2c_add_driver(&wm8728_i2c_driver);
367 if (ret != 0) {
368 printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
369 ret);
370 }
371 #endif
372 #if defined(CONFIG_SPI_MASTER)
373 ret = spi_register_driver(&wm8728_spi_driver);
374 if (ret != 0) {
375 printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
376 ret);
377 }
378 #endif
379 return ret;
380 }
381 module_init(wm8728_modinit);
382
wm8728_exit(void)383 static void __exit wm8728_exit(void)
384 {
385 #if IS_ENABLED(CONFIG_I2C)
386 i2c_del_driver(&wm8728_i2c_driver);
387 #endif
388 #if defined(CONFIG_SPI_MASTER)
389 spi_unregister_driver(&wm8728_spi_driver);
390 #endif
391 }
392 module_exit(wm8728_exit);
393
394 MODULE_DESCRIPTION("ASoC WM8728 driver");
395 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
396 MODULE_LICENSE("GPL");
397