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 <linux/slab.h>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25 #include <sound/soc.h>
26 #include <sound/soc-dapm.h>
27 #include <sound/initval.h>
28 #include <sound/tlv.h>
32 struct snd_soc_codec_device soc_codec_dev_wm8728;
35 * We can't read the WM8728 register space so we cache them instead.
36 * Note that the defaults here aren't the physical defaults, we latch
37 * the volume update bits, mute the output and enable infinite zero
40 static const u16 wm8728_reg_defaults[] = {
47 static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
49 static const struct snd_kcontrol_new wm8728_snd_controls[] = {
51 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
52 0, 255, 0, wm8728_tlv),
54 SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
60 static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
61 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
62 SND_SOC_DAPM_OUTPUT("VOUTL"),
63 SND_SOC_DAPM_OUTPUT("VOUTR"),
66 static const struct snd_soc_dapm_route intercon[] = {
67 {"VOUTL", NULL, "DAC"},
68 {"VOUTR", NULL, "DAC"},
71 static int wm8728_add_widgets(struct snd_soc_codec *codec)
73 snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets,
74 ARRAY_SIZE(wm8728_dapm_widgets));
76 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
81 static int wm8728_mute(struct snd_soc_dai *dai, int mute)
83 struct snd_soc_codec *codec = dai->codec;
84 u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
87 snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
89 snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
94 static int wm8728_hw_params(struct snd_pcm_substream *substream,
95 struct snd_pcm_hw_params *params,
96 struct snd_soc_dai *dai)
98 struct snd_soc_pcm_runtime *rtd = substream->private_data;
99 struct snd_soc_device *socdev = rtd->socdev;
100 struct snd_soc_codec *codec = socdev->card->codec;
101 u16 dac = snd_soc_read(codec, WM8728_DACCTL);
105 switch (params_format(params)) {
106 case SNDRV_PCM_FORMAT_S16_LE:
108 case SNDRV_PCM_FORMAT_S20_3LE:
111 case SNDRV_PCM_FORMAT_S24_LE:
118 snd_soc_write(codec, WM8728_DACCTL, dac);
123 static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
126 struct snd_soc_codec *codec = codec_dai->codec;
127 u16 iface = snd_soc_read(codec, WM8728_IFCTL);
129 /* Currently only I2S is supported by the driver, though the
130 * hardware is more flexible.
132 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
133 case SND_SOC_DAIFMT_I2S:
140 /* The hardware only support full slave mode */
141 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
142 case SND_SOC_DAIFMT_CBS_CFS:
148 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
149 case SND_SOC_DAIFMT_NB_NF:
152 case SND_SOC_DAIFMT_IB_NF:
156 case SND_SOC_DAIFMT_NB_IF:
160 case SND_SOC_DAIFMT_IB_IF:
167 snd_soc_write(codec, WM8728_IFCTL, iface);
171 static int wm8728_set_bias_level(struct snd_soc_codec *codec,
172 enum snd_soc_bias_level level)
178 case SND_SOC_BIAS_ON:
179 case SND_SOC_BIAS_PREPARE:
180 case SND_SOC_BIAS_STANDBY:
181 if (codec->bias_level == SND_SOC_BIAS_OFF) {
182 /* Power everything up... */
183 reg = snd_soc_read(codec, WM8728_DACCTL);
184 snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
186 /* ..then sync in the register cache. */
187 for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
188 snd_soc_write(codec, i,
189 snd_soc_read(codec, i));
193 case SND_SOC_BIAS_OFF:
194 reg = snd_soc_read(codec, WM8728_DACCTL);
195 snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
198 codec->bias_level = level;
202 #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
204 #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
205 SNDRV_PCM_FMTBIT_S24_LE)
207 static struct snd_soc_dai_ops wm8728_dai_ops = {
208 .hw_params = wm8728_hw_params,
209 .digital_mute = wm8728_mute,
210 .set_fmt = wm8728_set_dai_fmt,
213 struct snd_soc_dai wm8728_dai = {
216 .stream_name = "Playback",
219 .rates = WM8728_RATES,
220 .formats = WM8728_FORMATS,
222 .ops = &wm8728_dai_ops,
224 EXPORT_SYMBOL_GPL(wm8728_dai);
226 static int wm8728_suspend(struct platform_device *pdev, pm_message_t state)
228 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
229 struct snd_soc_codec *codec = socdev->card->codec;
231 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
236 static int wm8728_resume(struct platform_device *pdev)
238 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
239 struct snd_soc_codec *codec = socdev->card->codec;
241 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
247 * initialise the WM8728 driver
248 * register the mixer and dsp interfaces with the kernel
250 static int wm8728_init(struct snd_soc_device *socdev,
251 enum snd_soc_control_type control)
253 struct snd_soc_codec *codec = socdev->card->codec;
256 codec->name = "WM8728";
257 codec->owner = THIS_MODULE;
258 codec->set_bias_level = wm8728_set_bias_level;
259 codec->dai = &wm8728_dai;
261 codec->bias_level = SND_SOC_BIAS_OFF;
262 codec->reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults);
263 codec->reg_cache = kmemdup(wm8728_reg_defaults,
264 sizeof(wm8728_reg_defaults),
266 if (codec->reg_cache == NULL)
269 ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
271 printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
277 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
279 printk(KERN_ERR "wm8728: failed to create pcms\n");
283 /* power on device */
284 wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
286 snd_soc_add_controls(codec, wm8728_snd_controls,
287 ARRAY_SIZE(wm8728_snd_controls));
288 wm8728_add_widgets(codec);
293 kfree(codec->reg_cache);
297 static struct snd_soc_device *wm8728_socdev;
299 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
302 * WM8728 2 wire address is determined by GPIO5
303 * state during powerup.
308 static int wm8728_i2c_probe(struct i2c_client *i2c,
309 const struct i2c_device_id *id)
311 struct snd_soc_device *socdev = wm8728_socdev;
312 struct snd_soc_codec *codec = socdev->card->codec;
315 i2c_set_clientdata(i2c, codec);
316 codec->control_data = i2c;
318 ret = wm8728_init(socdev, SND_SOC_I2C);
320 pr_err("failed to initialise WM8728\n");
325 static int wm8728_i2c_remove(struct i2c_client *client)
327 struct snd_soc_codec *codec = i2c_get_clientdata(client);
328 kfree(codec->reg_cache);
332 static const struct i2c_device_id wm8728_i2c_id[] = {
336 MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
338 static struct i2c_driver wm8728_i2c_driver = {
340 .name = "WM8728 I2C Codec",
341 .owner = THIS_MODULE,
343 .probe = wm8728_i2c_probe,
344 .remove = wm8728_i2c_remove,
345 .id_table = wm8728_i2c_id,
348 static int wm8728_add_i2c_device(struct platform_device *pdev,
349 const struct wm8728_setup_data *setup)
351 struct i2c_board_info info;
352 struct i2c_adapter *adapter;
353 struct i2c_client *client;
356 ret = i2c_add_driver(&wm8728_i2c_driver);
358 dev_err(&pdev->dev, "can't add i2c driver\n");
362 memset(&info, 0, sizeof(struct i2c_board_info));
363 info.addr = setup->i2c_address;
364 strlcpy(info.type, "wm8728", I2C_NAME_SIZE);
366 adapter = i2c_get_adapter(setup->i2c_bus);
368 dev_err(&pdev->dev, "can't get i2c adapter %d\n",
373 client = i2c_new_device(adapter, &info);
374 i2c_put_adapter(adapter);
376 dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
377 (unsigned int)info.addr);
384 i2c_del_driver(&wm8728_i2c_driver);
389 #if defined(CONFIG_SPI_MASTER)
390 static int __devinit wm8728_spi_probe(struct spi_device *spi)
392 struct snd_soc_device *socdev = wm8728_socdev;
393 struct snd_soc_codec *codec = socdev->card->codec;
396 codec->control_data = spi;
398 ret = wm8728_init(socdev, SND_SOC_SPI);
400 dev_err(&spi->dev, "failed to initialise WM8728\n");
405 static int __devexit wm8728_spi_remove(struct spi_device *spi)
410 static struct spi_driver wm8728_spi_driver = {
413 .bus = &spi_bus_type,
414 .owner = THIS_MODULE,
416 .probe = wm8728_spi_probe,
417 .remove = __devexit_p(wm8728_spi_remove),
419 #endif /* CONFIG_SPI_MASTER */
421 static int wm8728_probe(struct platform_device *pdev)
423 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
424 struct wm8728_setup_data *setup;
425 struct snd_soc_codec *codec;
428 setup = socdev->codec_data;
429 codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
433 socdev->card->codec = codec;
434 mutex_init(&codec->mutex);
435 INIT_LIST_HEAD(&codec->dapm_widgets);
436 INIT_LIST_HEAD(&codec->dapm_paths);
438 wm8728_socdev = socdev;
441 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
442 if (setup->i2c_address) {
443 ret = wm8728_add_i2c_device(pdev, setup);
446 #if defined(CONFIG_SPI_MASTER)
448 ret = spi_register_driver(&wm8728_spi_driver);
450 printk(KERN_ERR "can't add spi driver");
460 /* power down chip */
461 static int wm8728_remove(struct platform_device *pdev)
463 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
464 struct snd_soc_codec *codec = socdev->card->codec;
466 if (codec->control_data)
467 wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
469 snd_soc_free_pcms(socdev);
470 snd_soc_dapm_free(socdev);
471 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
472 i2c_unregister_device(codec->control_data);
473 i2c_del_driver(&wm8728_i2c_driver);
475 #if defined(CONFIG_SPI_MASTER)
476 spi_unregister_driver(&wm8728_spi_driver);
483 struct snd_soc_codec_device soc_codec_dev_wm8728 = {
484 .probe = wm8728_probe,
485 .remove = wm8728_remove,
486 .suspend = wm8728_suspend,
487 .resume = wm8728_resume,
489 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8728);
491 static int __init wm8728_modinit(void)
493 return snd_soc_register_dai(&wm8728_dai);
495 module_init(wm8728_modinit);
497 static void __exit wm8728_exit(void)
499 snd_soc_unregister_dai(&wm8728_dai);
501 module_exit(wm8728_exit);
503 MODULE_DESCRIPTION("ASoC WM8728 driver");
504 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
505 MODULE_LICENSE("GPL");