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 <sound/core.h>
22 #include <sound/pcm.h>
23 #include <sound/pcm_params.h>
24 #include <sound/soc.h>
25 #include <sound/soc-dapm.h>
26 #include <sound/initval.h>
27 #include <sound/tlv.h>
31 struct snd_soc_codec_device soc_codec_dev_wm8728;
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
39 static const u16 wm8728_reg_defaults[] = {
46 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
48 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
50 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
51 0, 255, 0, wm8728_tlv),
53 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
59 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
60 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
61 SND_SOC_DAPM_OUTPUT("VOUTL"),
62 SND_SOC_DAPM_OUTPUT("VOUTR"),
65 static const struct snd_soc_dapm_route intercon[] = {
66 {"VOUTL", NULL, "DAC"},
67 {"VOUTR", NULL, "DAC"},
70 static int wm8728_add_widgets(struct snd_soc_codec *codec)
72 snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets,
73 ARRAY_SIZE(wm8728_dapm_widgets));
75 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
77 snd_soc_dapm_new_widgets(codec);
82 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
84 struct snd_soc_codec *codec = dai->codec;
85 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
88 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
90 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
95 static int wm8728_hw_params(struct snd_pcm_substream *substream,
96 struct snd_pcm_hw_params *params,
97 struct snd_soc_dai *dai)
99 struct snd_soc_pcm_runtime *rtd = substream->private_data;
100 struct snd_soc_device *socdev = rtd->socdev;
101 struct snd_soc_codec *codec = socdev->card->codec;
102 u16 dac = snd_soc_read(codec, WM8728_DACCTL);
106 switch (params_format(params)) {
107 case SNDRV_PCM_FORMAT_S16_LE:
109 case SNDRV_PCM_FORMAT_S20_3LE:
112 case SNDRV_PCM_FORMAT_S24_LE:
119 snd_soc_write(codec, WM8728_DACCTL, dac);
124 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
127 struct snd_soc_codec *codec = codec_dai->codec;
128 u16 iface = snd_soc_read(codec, WM8728_IFCTL);
130 /* Currently only I2S is supported by the driver, though the
131 * hardware is more flexible.
133 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
134 case SND_SOC_DAIFMT_I2S:
141 /* The hardware only support full slave mode */
142 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
143 case SND_SOC_DAIFMT_CBS_CFS:
149 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
150 case SND_SOC_DAIFMT_NB_NF:
153 case SND_SOC_DAIFMT_IB_NF:
157 case SND_SOC_DAIFMT_NB_IF:
161 case SND_SOC_DAIFMT_IB_IF:
168 snd_soc_write(codec, WM8728_IFCTL, iface);
172 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
173 enum snd_soc_bias_level level)
179 case SND_SOC_BIAS_ON:
180 case SND_SOC_BIAS_PREPARE:
181 case SND_SOC_BIAS_STANDBY:
182 if (codec->bias_level == SND_SOC_BIAS_OFF) {
183 /* Power everything up... */
184 reg = snd_soc_read(codec, WM8728_DACCTL);
185 snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
187 /* ..then sync in the register cache. */
188 for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
189 snd_soc_write(codec, i,
190 snd_soc_read(codec, i));
194 case SND_SOC_BIAS_OFF:
195 reg = snd_soc_read(codec, WM8728_DACCTL);
196 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
199 codec->bias_level = level;
203 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
205 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
206 SNDRV_PCM_FMTBIT_S24_LE)
208 static struct snd_soc_dai_ops wm8728_dai_ops = {
209 .hw_params = wm8728_hw_params,
210 .digital_mute = wm8728_mute,
211 .set_fmt = wm8728_set_dai_fmt,
214 struct snd_soc_dai wm8728_dai = {
217 .stream_name = "Playback",
220 .rates = WM8728_RATES,
221 .formats = WM8728_FORMATS,
223 .ops = &wm8728_dai_ops,
225 EXPORT_SYMBOL_GPL(wm8728_dai);
227 static int wm8728_suspend(struct platform_device *pdev, pm_message_t state)
229 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
230 struct snd_soc_codec *codec = socdev->card->codec;
232 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
237 static int wm8728_resume(struct platform_device *pdev)
239 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
240 struct snd_soc_codec *codec = socdev->card->codec;
242 wm8728_set_bias_level(codec, codec->suspend_bias_level);
248 * initialise the WM8728 driver
249 * register the mixer and dsp interfaces with the kernel
251 static int wm8728_init(struct snd_soc_device *socdev,
252 enum snd_soc_control_type control)
254 struct snd_soc_codec *codec = socdev->card->codec;
257 codec->name = "WM8728";
258 codec->owner = THIS_MODULE;
259 codec->set_bias_level = wm8728_set_bias_level;
260 codec->dai = &wm8728_dai;
262 codec->bias_level = SND_SOC_BIAS_OFF;
263 codec->reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults);
264 codec->reg_cache = kmemdup(wm8728_reg_defaults,
265 sizeof(wm8728_reg_defaults),
267 if (codec->reg_cache == NULL)
270 ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
272 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
278 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
280 printk(KERN_ERR "wm8728: failed to create pcms\n");
284 /* power on device */
285 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
287 snd_soc_add_controls(codec, wm8728_snd_controls,
288 ARRAY_SIZE(wm8728_snd_controls));
289 wm8728_add_widgets(codec);
290 ret = snd_soc_init_card(socdev);
292 printk(KERN_ERR "wm8728: failed to register card\n");
299 snd_soc_free_pcms(socdev);
300 snd_soc_dapm_free(socdev);
302 kfree(codec->reg_cache);
306 static struct snd_soc_device *wm8728_socdev;
308 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
311 * WM8728 2 wire address is determined by GPIO5
312 * state during powerup.
317 static int wm8728_i2c_probe(struct i2c_client *i2c,
318 const struct i2c_device_id *id)
320 struct snd_soc_device *socdev = wm8728_socdev;
321 struct snd_soc_codec *codec = socdev->card->codec;
324 i2c_set_clientdata(i2c, codec);
325 codec->control_data = i2c;
327 ret = wm8728_init(socdev, SND_SOC_I2C);
329 pr_err("failed to initialise WM8728\n");
334 static int wm8728_i2c_remove(struct i2c_client *client)
336 struct snd_soc_codec *codec = i2c_get_clientdata(client);
337 kfree(codec->reg_cache);
341 static const struct i2c_device_id wm8728_i2c_id[] = {
345 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
347 static struct i2c_driver wm8728_i2c_driver = {
349 .name = "WM8728 I2C Codec",
350 .owner = THIS_MODULE,
352 .probe = wm8728_i2c_probe,
353 .remove = wm8728_i2c_remove,
354 .id_table = wm8728_i2c_id,
357 static int wm8728_add_i2c_device(struct platform_device *pdev,
358 const struct wm8728_setup_data *setup)
360 struct i2c_board_info info;
361 struct i2c_adapter *adapter;
362 struct i2c_client *client;
365 ret = i2c_add_driver(&wm8728_i2c_driver);
367 dev_err(&pdev->dev, "can't add i2c driver\n");
371 memset(&info, 0, sizeof(struct i2c_board_info));
372 info.addr = setup->i2c_address;
373 strlcpy(info.type, "wm8728", I2C_NAME_SIZE);
375 adapter = i2c_get_adapter(setup->i2c_bus);
377 dev_err(&pdev->dev, "can't get i2c adapter %d\n",
382 client = i2c_new_device(adapter, &info);
383 i2c_put_adapter(adapter);
385 dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
386 (unsigned int)info.addr);
393 i2c_del_driver(&wm8728_i2c_driver);
398 #if defined(CONFIG_SPI_MASTER)
399 static int __devinit wm8728_spi_probe(struct spi_device *spi)
401 struct snd_soc_device *socdev = wm8728_socdev;
402 struct snd_soc_codec *codec = socdev->card->codec;
405 codec->control_data = spi;
407 ret = wm8728_init(socdev, SND_SOC_SPI);
409 dev_err(&spi->dev, "failed to initialise WM8728\n");
414 static int __devexit wm8728_spi_remove(struct spi_device *spi)
419 static struct spi_driver wm8728_spi_driver = {
422 .bus = &spi_bus_type,
423 .owner = THIS_MODULE,
425 .probe = wm8728_spi_probe,
426 .remove = __devexit_p(wm8728_spi_remove),
428 #endif /* CONFIG_SPI_MASTER */
430 static int wm8728_probe(struct platform_device *pdev)
432 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
433 struct wm8728_setup_data *setup;
434 struct snd_soc_codec *codec;
437 setup = socdev->codec_data;
438 codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
442 socdev->card->codec = codec;
443 mutex_init(&codec->mutex);
444 INIT_LIST_HEAD(&codec->dapm_widgets);
445 INIT_LIST_HEAD(&codec->dapm_paths);
447 wm8728_socdev = socdev;
450 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
451 if (setup->i2c_address) {
452 ret = wm8728_add_i2c_device(pdev, setup);
455 #if defined(CONFIG_SPI_MASTER)
457 ret = spi_register_driver(&wm8728_spi_driver);
459 printk(KERN_ERR "can't add spi driver");
469 /* power down chip */
470 static int wm8728_remove(struct platform_device *pdev)
472 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
473 struct snd_soc_codec *codec = socdev->card->codec;
475 if (codec->control_data)
476 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
478 snd_soc_free_pcms(socdev);
479 snd_soc_dapm_free(socdev);
480 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
481 i2c_unregister_device(codec->control_data);
482 i2c_del_driver(&wm8728_i2c_driver);
484 #if defined(CONFIG_SPI_MASTER)
485 spi_unregister_driver(&wm8728_spi_driver);
492 struct snd_soc_codec_device soc_codec_dev_wm8728 = {
493 .probe = wm8728_probe,
494 .remove = wm8728_remove,
495 .suspend = wm8728_suspend,
496 .resume = wm8728_resume,
498 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8728);
500 static int __init wm8728_modinit(void)
502 return snd_soc_register_dai(&wm8728_dai);
504 module_init(wm8728_modinit);
506 static void __exit wm8728_exit(void)
508 snd_soc_unregister_dai(&wm8728_dai);
510 module_exit(wm8728_exit);
512 MODULE_DESCRIPTION("ASoC WM8728 driver");
513 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
514 MODULE_LICENSE("GPL");