397 lines
8.9 KiB
C
397 lines
8.9 KiB
C
/*
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* wm8728.c -- WM8728 ALSA SoC Audio driver
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*
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* Copyright 2008 Wolfson Microelectronics plc
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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#include <linux/i2c.h>
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#include <linux/platform_device.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/initval.h>
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#include <sound/tlv.h>
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#include "wm8728.h"
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/*
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* We can't read the WM8728 register space so we cache them instead.
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* Note that the defaults here aren't the physical defaults, we latch
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* the volume update bits, mute the output and enable infinite zero
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* detect.
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*/
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static const u16 wm8728_reg_defaults[] = {
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0x1ff,
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0x1ff,
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0x001,
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0x100,
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};
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/* codec private data */
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struct wm8728_priv {
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enum snd_soc_control_type control_type;
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};
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static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
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static const struct snd_kcontrol_new wm8728_snd_controls[] = {
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SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
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0, 255, 0, wm8728_tlv),
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SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
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};
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/*
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* DAPM controls.
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*/
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static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
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SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
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SND_SOC_DAPM_OUTPUT("VOUTL"),
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SND_SOC_DAPM_OUTPUT("VOUTR"),
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};
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static const struct snd_soc_dapm_route intercon[] = {
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{"VOUTL", NULL, "DAC"},
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{"VOUTR", NULL, "DAC"},
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};
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static int wm8728_add_widgets(struct snd_soc_codec *codec)
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{
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struct snd_soc_dapm_context *dapm = &codec->dapm;
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snd_soc_dapm_new_controls(dapm, wm8728_dapm_widgets,
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ARRAY_SIZE(wm8728_dapm_widgets));
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snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
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return 0;
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}
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static int wm8728_mute(struct snd_soc_dai *dai, int mute)
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{
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struct snd_soc_codec *codec = dai->codec;
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u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
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if (mute)
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snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
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else
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snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
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return 0;
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}
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static int wm8728_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_codec *codec = rtd->codec;
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u16 dac = snd_soc_read(codec, WM8728_DACCTL);
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dac &= ~0x18;
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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break;
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case SNDRV_PCM_FORMAT_S20_3LE:
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dac |= 0x10;
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break;
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case SNDRV_PCM_FORMAT_S24_LE:
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dac |= 0x08;
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break;
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default:
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return -EINVAL;
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}
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snd_soc_write(codec, WM8728_DACCTL, dac);
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return 0;
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}
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static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
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unsigned int fmt)
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{
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struct snd_soc_codec *codec = codec_dai->codec;
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u16 iface = snd_soc_read(codec, WM8728_IFCTL);
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/* Currently only I2S is supported by the driver, though the
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* hardware is more flexible.
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*/
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switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_I2S:
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iface |= 1;
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break;
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default:
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return -EINVAL;
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}
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/* The hardware only support full slave mode */
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switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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case SND_SOC_DAIFMT_CBS_CFS:
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break;
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default:
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return -EINVAL;
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}
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switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
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case SND_SOC_DAIFMT_NB_NF:
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iface &= ~0x22;
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break;
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case SND_SOC_DAIFMT_IB_NF:
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iface |= 0x20;
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iface &= ~0x02;
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break;
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case SND_SOC_DAIFMT_NB_IF:
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iface |= 0x02;
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iface &= ~0x20;
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break;
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case SND_SOC_DAIFMT_IB_IF:
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iface |= 0x22;
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break;
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default:
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return -EINVAL;
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}
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snd_soc_write(codec, WM8728_IFCTL, iface);
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return 0;
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}
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static int wm8728_set_bias_level(struct snd_soc_codec *codec,
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enum snd_soc_bias_level level)
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{
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u16 reg;
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int i;
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switch (level) {
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case SND_SOC_BIAS_ON:
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case SND_SOC_BIAS_PREPARE:
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case SND_SOC_BIAS_STANDBY:
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if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
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/* Power everything up... */
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reg = snd_soc_read(codec, WM8728_DACCTL);
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snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
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/* ..then sync in the register cache. */
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for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++)
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snd_soc_write(codec, i,
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snd_soc_read(codec, i));
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}
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break;
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case SND_SOC_BIAS_OFF:
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reg = snd_soc_read(codec, WM8728_DACCTL);
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snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
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break;
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}
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codec->dapm.bias_level = level;
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return 0;
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}
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#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
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#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
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SNDRV_PCM_FMTBIT_S24_LE)
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static struct snd_soc_dai_ops wm8728_dai_ops = {
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.hw_params = wm8728_hw_params,
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.digital_mute = wm8728_mute,
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.set_fmt = wm8728_set_dai_fmt,
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};
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static struct snd_soc_dai_driver wm8728_dai = {
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.name = "wm8728-hifi",
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.playback = {
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.stream_name = "Playback",
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.channels_min = 2,
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.channels_max = 2,
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.rates = WM8728_RATES,
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.formats = WM8728_FORMATS,
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},
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.ops = &wm8728_dai_ops,
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};
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static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state)
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{
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wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
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return 0;
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}
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static int wm8728_resume(struct snd_soc_codec *codec)
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{
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wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
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return 0;
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}
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static int wm8728_probe(struct snd_soc_codec *codec)
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{
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struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
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int ret;
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ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type);
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if (ret < 0) {
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printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n",
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ret);
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return ret;
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}
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/* power on device */
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wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
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snd_soc_add_controls(codec, wm8728_snd_controls,
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ARRAY_SIZE(wm8728_snd_controls));
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wm8728_add_widgets(codec);
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return ret;
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}
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static int wm8728_remove(struct snd_soc_codec *codec)
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{
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wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF);
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return 0;
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}
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static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
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.probe = wm8728_probe,
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.remove = wm8728_remove,
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.suspend = wm8728_suspend,
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.resume = wm8728_resume,
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.set_bias_level = wm8728_set_bias_level,
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.reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults),
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.reg_word_size = sizeof(u16),
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.reg_cache_default = wm8728_reg_defaults,
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};
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#if defined(CONFIG_SPI_MASTER)
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static int __devinit wm8728_spi_probe(struct spi_device *spi)
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{
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struct wm8728_priv *wm8728;
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int ret;
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wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
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if (wm8728 == NULL)
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return -ENOMEM;
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wm8728->control_type = SND_SOC_SPI;
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spi_set_drvdata(spi, wm8728);
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ret = snd_soc_register_codec(&spi->dev,
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&soc_codec_dev_wm8728, &wm8728_dai, 1);
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if (ret < 0)
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kfree(wm8728);
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return ret;
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}
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static int __devexit wm8728_spi_remove(struct spi_device *spi)
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{
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snd_soc_unregister_codec(&spi->dev);
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kfree(spi_get_drvdata(spi));
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return 0;
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}
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static struct spi_driver wm8728_spi_driver = {
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.driver = {
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.name = "wm8728-codec",
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.owner = THIS_MODULE,
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},
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.probe = wm8728_spi_probe,
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.remove = __devexit_p(wm8728_spi_remove),
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};
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#endif /* CONFIG_SPI_MASTER */
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#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
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static __devinit int wm8728_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct wm8728_priv *wm8728;
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int ret;
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wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL);
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if (wm8728 == NULL)
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return -ENOMEM;
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i2c_set_clientdata(i2c, wm8728);
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wm8728->control_type = SND_SOC_I2C;
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ret = snd_soc_register_codec(&i2c->dev,
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&soc_codec_dev_wm8728, &wm8728_dai, 1);
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if (ret < 0)
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kfree(wm8728);
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return ret;
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}
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static __devexit int wm8728_i2c_remove(struct i2c_client *client)
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{
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snd_soc_unregister_codec(&client->dev);
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kfree(i2c_get_clientdata(client));
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return 0;
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}
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static const struct i2c_device_id wm8728_i2c_id[] = {
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{ "wm8728", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
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static struct i2c_driver wm8728_i2c_driver = {
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.driver = {
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.name = "wm8728-codec",
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.owner = THIS_MODULE,
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},
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.probe = wm8728_i2c_probe,
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.remove = __devexit_p(wm8728_i2c_remove),
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.id_table = wm8728_i2c_id,
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};
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#endif
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static int __init wm8728_modinit(void)
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{
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int ret = 0;
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#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
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ret = i2c_add_driver(&wm8728_i2c_driver);
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if (ret != 0) {
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printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
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ret);
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}
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#endif
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#if defined(CONFIG_SPI_MASTER)
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ret = spi_register_driver(&wm8728_spi_driver);
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if (ret != 0) {
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printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
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ret);
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}
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#endif
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return ret;
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}
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module_init(wm8728_modinit);
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static void __exit wm8728_exit(void)
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{
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#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
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i2c_del_driver(&wm8728_i2c_driver);
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#endif
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#if defined(CONFIG_SPI_MASTER)
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spi_unregister_driver(&wm8728_spi_driver);
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#endif
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}
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module_exit(wm8728_exit);
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MODULE_DESCRIPTION("ASoC WM8728 driver");
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_LICENSE("GPL");
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