diff options
Diffstat (limited to 'sound/soc/codecs/wm8728.c')
| -rw-r--r-- | sound/soc/codecs/wm8728.c | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/sound/soc/codecs/wm8728.c b/sound/soc/codecs/wm8728.c new file mode 100644 index 00000000..86d4718d --- /dev/null +++ b/sound/soc/codecs/wm8728.c @@ -0,0 +1,388 @@ +/* + * wm8728.c -- WM8728 ALSA SoC Audio driver + * + * Copyright 2008 Wolfson Microelectronics plc + * + * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/pm.h> +#include <linux/i2c.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/slab.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> +#include <sound/initval.h> +#include <sound/tlv.h> + +#include "wm8728.h" + +/* + * We can't read the WM8728 register space so we cache them instead. + * Note that the defaults here aren't the physical defaults, we latch + * the volume update bits, mute the output and enable infinite zero + * detect. + */ +static const u16 wm8728_reg_defaults[] = { + 0x1ff, + 0x1ff, + 0x001, + 0x100, +}; + +/* codec private data */ +struct wm8728_priv { + enum snd_soc_control_type control_type; +}; + +static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1); + +static const struct snd_kcontrol_new wm8728_snd_controls[] = { + +SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL, + 0, 255, 0, wm8728_tlv), + +SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0), +}; + +/* + * DAPM controls. + */ +static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = { +SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0), +SND_SOC_DAPM_OUTPUT("VOUTL"), +SND_SOC_DAPM_OUTPUT("VOUTR"), +}; + +static const struct snd_soc_dapm_route wm8728_intercon[] = { + {"VOUTL", NULL, "DAC"}, + {"VOUTR", NULL, "DAC"}, +}; + +static int wm8728_mute(struct snd_soc_dai *dai, int mute) +{ + struct snd_soc_codec *codec = dai->codec; + u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL); + + if (mute) + snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1); + else + snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1); + + return 0; +} + +static int wm8728_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_codec *codec = rtd->codec; + u16 dac = snd_soc_read(codec, WM8728_DACCTL); + + dac &= ~0x18; + + switch (params_format(params)) { + case SNDRV_PCM_FORMAT_S16_LE: + break; + case SNDRV_PCM_FORMAT_S20_3LE: + dac |= 0x10; + break; + case SNDRV_PCM_FORMAT_S24_LE: + dac |= 0x08; + break; + default: + return -EINVAL; + } + + snd_soc_write(codec, WM8728_DACCTL, dac); + + return 0; +} + +static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai, + unsigned int fmt) +{ + struct snd_soc_codec *codec = codec_dai->codec; + u16 iface = snd_soc_read(codec, WM8728_IFCTL); + + /* Currently only I2S is supported by the driver, though the + * hardware is more flexible. + */ + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + iface |= 1; + break; + default: + return -EINVAL; + } + + /* The hardware only support full slave mode */ + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBS_CFS: + break; + default: + return -EINVAL; + } + + switch (fmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: + iface &= ~0x22; + break; + case SND_SOC_DAIFMT_IB_NF: + iface |= 0x20; + iface &= ~0x02; + break; + case SND_SOC_DAIFMT_NB_IF: + iface |= 0x02; + iface &= ~0x20; + break; + case SND_SOC_DAIFMT_IB_IF: + iface |= 0x22; + break; + default: + return -EINVAL; + } + + snd_soc_write(codec, WM8728_IFCTL, iface); + return 0; +} + +static int wm8728_set_bias_level(struct snd_soc_codec *codec, + enum snd_soc_bias_level level) +{ + u16 reg; + int i; + + switch (level) { + case SND_SOC_BIAS_ON: + case SND_SOC_BIAS_PREPARE: + case SND_SOC_BIAS_STANDBY: + if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) { + /* Power everything up... */ + reg = snd_soc_read(codec, WM8728_DACCTL); + snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4); + + /* ..then sync in the register cache. */ + for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++) + snd_soc_write(codec, i, + snd_soc_read(codec, i)); + } + break; + + case SND_SOC_BIAS_OFF: + reg = snd_soc_read(codec, WM8728_DACCTL); + snd_soc_write(codec, WM8728_DACCTL, reg | 0x4); + break; + } + codec->dapm.bias_level = level; + return 0; +} + +#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000) + +#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ + SNDRV_PCM_FMTBIT_S24_LE) + +static struct snd_soc_dai_ops wm8728_dai_ops = { + .hw_params = wm8728_hw_params, + .digital_mute = wm8728_mute, + .set_fmt = wm8728_set_dai_fmt, +}; + +static struct snd_soc_dai_driver wm8728_dai = { + .name = "wm8728-hifi", + .playback = { + .stream_name = "Playback", + .channels_min = 2, + .channels_max = 2, + .rates = WM8728_RATES, + .formats = WM8728_FORMATS, + }, + .ops = &wm8728_dai_ops, +}; + +static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state) +{ + wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); + + return 0; +} + +static int wm8728_resume(struct snd_soc_codec *codec) +{ + wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY); + + return 0; +} + +static int wm8728_probe(struct snd_soc_codec *codec) +{ + struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec); + int ret; + + ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type); + if (ret < 0) { + printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n", + ret); + return ret; + } + + /* power on device */ + wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY); + + snd_soc_add_controls(codec, wm8728_snd_controls, + ARRAY_SIZE(wm8728_snd_controls)); + + return ret; +} + +static int wm8728_remove(struct snd_soc_codec *codec) +{ + wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); + return 0; +} + +static struct snd_soc_codec_driver soc_codec_dev_wm8728 = { + .probe = wm8728_probe, + .remove = wm8728_remove, + .suspend = wm8728_suspend, + .resume = wm8728_resume, + .set_bias_level = wm8728_set_bias_level, + .reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults), + .reg_word_size = sizeof(u16), + .reg_cache_default = wm8728_reg_defaults, + .dapm_widgets = wm8728_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets), + .dapm_routes = wm8728_intercon, + .num_dapm_routes = ARRAY_SIZE(wm8728_intercon), +}; + +#if defined(CONFIG_SPI_MASTER) +static int __devinit wm8728_spi_probe(struct spi_device *spi) +{ + struct wm8728_priv *wm8728; + int ret; + + wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL); + if (wm8728 == NULL) + return -ENOMEM; + + wm8728->control_type = SND_SOC_SPI; + spi_set_drvdata(spi, wm8728); + + ret = snd_soc_register_codec(&spi->dev, + &soc_codec_dev_wm8728, &wm8728_dai, 1); + if (ret < 0) + kfree(wm8728); + return ret; +} + +static int __devexit wm8728_spi_remove(struct spi_device *spi) +{ + snd_soc_unregister_codec(&spi->dev); + kfree(spi_get_drvdata(spi)); + return 0; +} + +static struct spi_driver wm8728_spi_driver = { + .driver = { + .name = "wm8728-codec", + .owner = THIS_MODULE, + }, + .probe = wm8728_spi_probe, + .remove = __devexit_p(wm8728_spi_remove), +}; +#endif /* CONFIG_SPI_MASTER */ + +#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) +static __devinit int wm8728_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct wm8728_priv *wm8728; + int ret; + + wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL); + if (wm8728 == NULL) + return -ENOMEM; + + i2c_set_clientdata(i2c, wm8728); + wm8728->control_type = SND_SOC_I2C; + + ret = snd_soc_register_codec(&i2c->dev, + &soc_codec_dev_wm8728, &wm8728_dai, 1); + if (ret < 0) + kfree(wm8728); + return ret; +} + +static __devexit int wm8728_i2c_remove(struct i2c_client *client) +{ + snd_soc_unregister_codec(&client->dev); + kfree(i2c_get_clientdata(client)); + return 0; +} + +static const struct i2c_device_id wm8728_i2c_id[] = { + { "wm8728", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id); + +static struct i2c_driver wm8728_i2c_driver = { + .driver = { + .name = "wm8728-codec", + .owner = THIS_MODULE, + }, + .probe = wm8728_i2c_probe, + .remove = __devexit_p(wm8728_i2c_remove), + .id_table = wm8728_i2c_id, +}; +#endif + +static int __init wm8728_modinit(void) +{ + int ret = 0; +#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) + ret = i2c_add_driver(&wm8728_i2c_driver); + if (ret != 0) { + printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n", + ret); + } +#endif +#if defined(CONFIG_SPI_MASTER) + ret = spi_register_driver(&wm8728_spi_driver); + if (ret != 0) { + printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n", + ret); + } +#endif + return ret; +} +module_init(wm8728_modinit); + +static void __exit wm8728_exit(void) +{ +#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) + i2c_del_driver(&wm8728_i2c_driver); +#endif +#if defined(CONFIG_SPI_MASTER) + spi_unregister_driver(&wm8728_spi_driver); +#endif +} +module_exit(wm8728_exit); + +MODULE_DESCRIPTION("ASoC WM8728 driver"); +MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); +MODULE_LICENSE("GPL"); |