/* * 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/soc-dapm.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 intercon[] = { {"VOUTL", NULL, "DAC"}, {"VOUTR", NULL, "DAC"}, }; static int wm8728_add_widgets(struct snd_soc_codec *codec) { snd_soc_dapm_new_controls(codec, wm8728_dapm_widgets, ARRAY_SIZE(wm8728_dapm_widgets)); snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon)); return 0; } 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->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->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)); wm8728_add_widgets(codec); 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, }; #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");