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));
80 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
82 struct snd_soc_codec *codec = dai->codec;
83 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
86 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
88 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
93 static int wm8728_hw_params(struct snd_pcm_substream *substream,
94 struct snd_pcm_hw_params *params,
95 struct snd_soc_dai *dai)
97 struct snd_soc_pcm_runtime *rtd = substream->private_data;
98 struct snd_soc_device *socdev = rtd->socdev;
99 struct snd_soc_codec *codec = socdev->card->codec;
100 u16 dac = snd_soc_read(codec, WM8728_DACCTL);
104 switch (params_format(params)) {
105 case SNDRV_PCM_FORMAT_S16_LE:
107 case SNDRV_PCM_FORMAT_S20_3LE:
110 case SNDRV_PCM_FORMAT_S24_LE:
117 snd_soc_write(codec, WM8728_DACCTL, dac);
122 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
125 struct snd_soc_codec *codec = codec_dai->codec;
126 u16 iface = snd_soc_read(codec, WM8728_IFCTL);
128 /* Currently only I2S is supported by the driver, though the
129 * hardware is more flexible.
131 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
132 case SND_SOC_DAIFMT_I2S:
139 /* The hardware only support full slave mode */
140 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
141 case SND_SOC_DAIFMT_CBS_CFS:
147 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
148 case SND_SOC_DAIFMT_NB_NF:
151 case SND_SOC_DAIFMT_IB_NF:
155 case SND_SOC_DAIFMT_NB_IF:
159 case SND_SOC_DAIFMT_IB_IF:
166 snd_soc_write(codec, WM8728_IFCTL, iface);
170 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
171 enum snd_soc_bias_level level)
177 case SND_SOC_BIAS_ON:
178 case SND_SOC_BIAS_PREPARE:
179 case SND_SOC_BIAS_STANDBY:
180 if (codec->bias_level == SND_SOC_BIAS_OFF) {
181 /* Power everything up... */
182 reg = snd_soc_read(codec, WM8728_DACCTL);
183 snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
185 /* ..then sync in the register cache. */
186 for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
187 snd_soc_write(codec, i,
188 snd_soc_read(codec, i));
192 case SND_SOC_BIAS_OFF:
193 reg = snd_soc_read(codec, WM8728_DACCTL);
194 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
197 codec->bias_level = level;
201 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
203 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
204 SNDRV_PCM_FMTBIT_S24_LE)
206 static struct snd_soc_dai_ops wm8728_dai_ops = {
207 .hw_params = wm8728_hw_params,
208 .digital_mute = wm8728_mute,
209 .set_fmt = wm8728_set_dai_fmt,
212 struct snd_soc_dai wm8728_dai = {
215 .stream_name = "Playback",
218 .rates = WM8728_RATES,
219 .formats = WM8728_FORMATS,
221 .ops = &wm8728_dai_ops,
223 EXPORT_SYMBOL_GPL(wm8728_dai);
225 static int wm8728_suspend(struct platform_device *pdev, pm_message_t state)
227 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
228 struct snd_soc_codec *codec = socdev->card->codec;
230 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
235 static int wm8728_resume(struct platform_device *pdev)
237 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
238 struct snd_soc_codec *codec = socdev->card->codec;
240 wm8728_set_bias_level(codec, codec->suspend_bias_level);
246 * initialise the WM8728 driver
247 * register the mixer and dsp interfaces with the kernel
249 static int wm8728_init(struct snd_soc_device *socdev,
250 enum snd_soc_control_type control)
252 struct snd_soc_codec *codec = socdev->card->codec;
255 codec->name = "WM8728";
256 codec->owner = THIS_MODULE;
257 codec->set_bias_level = wm8728_set_bias_level;
258 codec->dai = &wm8728_dai;
260 codec->bias_level = SND_SOC_BIAS_OFF;
261 codec->reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults);
262 codec->reg_cache = kmemdup(wm8728_reg_defaults,
263 sizeof(wm8728_reg_defaults),
265 if (codec->reg_cache == NULL)
268 ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
270 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
276 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
278 printk(KERN_ERR "wm8728: failed to create pcms\n");
282 /* power on device */
283 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
285 snd_soc_add_controls(codec, wm8728_snd_controls,
286 ARRAY_SIZE(wm8728_snd_controls));
287 wm8728_add_widgets(codec);
292 kfree(codec->reg_cache);
296 static struct snd_soc_device *wm8728_socdev;
298 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
301 * WM8728 2 wire address is determined by GPIO5
302 * state during powerup.
307 static int wm8728_i2c_probe(struct i2c_client *i2c,
308 const struct i2c_device_id *id)
310 struct snd_soc_device *socdev = wm8728_socdev;
311 struct snd_soc_codec *codec = socdev->card->codec;
314 i2c_set_clientdata(i2c, codec);
315 codec->control_data = i2c;
317 ret = wm8728_init(socdev, SND_SOC_I2C);
319 pr_err("failed to initialise WM8728\n");
324 static int wm8728_i2c_remove(struct i2c_client *client)
326 struct snd_soc_codec *codec = i2c_get_clientdata(client);
327 kfree(codec->reg_cache);
331 static const struct i2c_device_id wm8728_i2c_id[] = {
335 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
337 static struct i2c_driver wm8728_i2c_driver = {
339 .name = "WM8728 I2C Codec",
340 .owner = THIS_MODULE,
342 .probe = wm8728_i2c_probe,
343 .remove = wm8728_i2c_remove,
344 .id_table = wm8728_i2c_id,
347 static int wm8728_add_i2c_device(struct platform_device *pdev,
348 const struct wm8728_setup_data *setup)
350 struct i2c_board_info info;
351 struct i2c_adapter *adapter;
352 struct i2c_client *client;
355 ret = i2c_add_driver(&wm8728_i2c_driver);
357 dev_err(&pdev->dev, "can't add i2c driver\n");
361 memset(&info, 0, sizeof(struct i2c_board_info));
362 info.addr = setup->i2c_address;
363 strlcpy(info.type, "wm8728", I2C_NAME_SIZE);
365 adapter = i2c_get_adapter(setup->i2c_bus);
367 dev_err(&pdev->dev, "can't get i2c adapter %d\n",
372 client = i2c_new_device(adapter, &info);
373 i2c_put_adapter(adapter);
375 dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
376 (unsigned int)info.addr);
383 i2c_del_driver(&wm8728_i2c_driver);
388 #if defined(CONFIG_SPI_MASTER)
389 static int __devinit wm8728_spi_probe(struct spi_device *spi)
391 struct snd_soc_device *socdev = wm8728_socdev;
392 struct snd_soc_codec *codec = socdev->card->codec;
395 codec->control_data = spi;
397 ret = wm8728_init(socdev, SND_SOC_SPI);
399 dev_err(&spi->dev, "failed to initialise WM8728\n");
404 static int __devexit wm8728_spi_remove(struct spi_device *spi)
409 static struct spi_driver wm8728_spi_driver = {
412 .bus = &spi_bus_type,
413 .owner = THIS_MODULE,
415 .probe = wm8728_spi_probe,
416 .remove = __devexit_p(wm8728_spi_remove),
418 #endif /* CONFIG_SPI_MASTER */
420 static int wm8728_probe(struct platform_device *pdev)
422 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
423 struct wm8728_setup_data *setup;
424 struct snd_soc_codec *codec;
427 setup = socdev->codec_data;
428 codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
432 socdev->card->codec = codec;
433 mutex_init(&codec->mutex);
434 INIT_LIST_HEAD(&codec->dapm_widgets);
435 INIT_LIST_HEAD(&codec->dapm_paths);
437 wm8728_socdev = socdev;
440 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
441 if (setup->i2c_address) {
442 ret = wm8728_add_i2c_device(pdev, setup);
445 #if defined(CONFIG_SPI_MASTER)
447 ret = spi_register_driver(&wm8728_spi_driver);
449 printk(KERN_ERR "can't add spi driver");
459 /* power down chip */
460 static int wm8728_remove(struct platform_device *pdev)
462 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
463 struct snd_soc_codec *codec = socdev->card->codec;
465 if (codec->control_data)
466 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
468 snd_soc_free_pcms(socdev);
469 snd_soc_dapm_free(socdev);
470 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
471 i2c_unregister_device(codec->control_data);
472 i2c_del_driver(&wm8728_i2c_driver);
474 #if defined(CONFIG_SPI_MASTER)
475 spi_unregister_driver(&wm8728_spi_driver);
482 struct snd_soc_codec_device soc_codec_dev_wm8728 = {
483 .probe = wm8728_probe,
484 .remove = wm8728_remove,
485 .suspend = wm8728_suspend,
486 .resume = wm8728_resume,
488 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8728);
490 static int __init wm8728_modinit(void)
492 return snd_soc_register_dai(&wm8728_dai);
494 module_init(wm8728_modinit);
496 static void __exit wm8728_exit(void)
498 snd_soc_unregister_dai(&wm8728_dai);
500 module_exit(wm8728_exit);
502 MODULE_DESCRIPTION("ASoC WM8728 driver");
503 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
504 MODULE_LICENSE("GPL");