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Linux/sound/soc/codecs/wm8728.c

  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 
 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 
 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 
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 
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 
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 
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 
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 
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)
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 
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)
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 
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 
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 
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 

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