276 lines
6.3 KiB
C
276 lines
6.3 KiB
C
/*
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* LM4857 AMP driver
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*
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* Copyright 2007 Wolfson Microelectronics PLC.
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* Author: Graeme Gregory
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* graeme.gregory@wolfsonmicro.com
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* Copyright 2011 Lars-Peter Clausen <lars@metafoo.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <sound/soc.h>
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#include <sound/tlv.h>
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struct lm4857 {
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struct i2c_client *i2c;
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uint8_t mode;
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};
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static const uint8_t lm4857_default_regs[] = {
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0x00, 0x00, 0x00, 0x00,
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};
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/* The register offsets in the cache array */
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#define LM4857_MVOL 0
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#define LM4857_LVOL 1
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#define LM4857_RVOL 2
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#define LM4857_CTRL 3
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/* the shifts required to set these bits */
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#define LM4857_3D 5
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#define LM4857_WAKEUP 5
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#define LM4857_EPGAIN 4
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static int lm4857_write(struct snd_soc_codec *codec, unsigned int reg,
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unsigned int value)
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{
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uint8_t data;
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int ret;
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ret = snd_soc_cache_write(codec, reg, value);
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if (ret < 0)
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return ret;
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data = (reg << 6) | value;
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ret = i2c_master_send(codec->control_data, &data, 1);
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if (ret != 1) {
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dev_err(codec->dev, "Failed to write register: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static unsigned int lm4857_read(struct snd_soc_codec *codec,
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unsigned int reg)
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{
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unsigned int val;
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int ret;
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ret = snd_soc_cache_read(codec, reg, &val);
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if (ret)
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return -1;
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return val;
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}
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static int lm4857_get_mode(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
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struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
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ucontrol->value.integer.value[0] = lm4857->mode;
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return 0;
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}
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static int lm4857_set_mode(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
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struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
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uint8_t value = ucontrol->value.integer.value[0];
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lm4857->mode = value;
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if (codec->dapm.bias_level == SND_SOC_BIAS_ON)
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snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, value + 6);
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return 1;
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}
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static int lm4857_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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struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
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switch (level) {
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case SND_SOC_BIAS_ON:
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snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, lm4857->mode + 6);
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break;
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case SND_SOC_BIAS_STANDBY:
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snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, 0);
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break;
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default:
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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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static const char *lm4857_mode[] = {
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"Earpiece",
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"Loudspeaker",
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"Loudspeaker + Headphone",
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"Headphone",
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};
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static const struct soc_enum lm4857_mode_enum =
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SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(lm4857_mode), lm4857_mode);
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static const struct snd_soc_dapm_widget lm4857_dapm_widgets[] = {
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SND_SOC_DAPM_INPUT("IN"),
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SND_SOC_DAPM_OUTPUT("LS"),
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SND_SOC_DAPM_OUTPUT("HP"),
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SND_SOC_DAPM_OUTPUT("EP"),
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};
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static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
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static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
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static const struct snd_kcontrol_new lm4857_controls[] = {
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SOC_SINGLE_TLV("Left Playback Volume", LM4857_LVOL, 0, 31, 0,
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stereo_tlv),
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SOC_SINGLE_TLV("Right Playback Volume", LM4857_RVOL, 0, 31, 0,
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stereo_tlv),
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SOC_SINGLE_TLV("Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
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mono_tlv),
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SOC_SINGLE("Spk 3D Playback Switch", LM4857_LVOL, LM4857_3D, 1, 0),
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SOC_SINGLE("HP 3D Playback Switch", LM4857_RVOL, LM4857_3D, 1, 0),
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SOC_SINGLE("Fast Wakeup Playback Switch", LM4857_CTRL,
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LM4857_WAKEUP, 1, 0),
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SOC_SINGLE("Earpiece 6dB Playback Switch", LM4857_CTRL,
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LM4857_EPGAIN, 1, 0),
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SOC_ENUM_EXT("Mode", lm4857_mode_enum,
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lm4857_get_mode, lm4857_set_mode),
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};
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/* There is a demux between the input signal and the output signals.
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* Currently there is no easy way to model it in ASoC and since it does not make
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* much of a difference in practice simply connect the input direclty to the
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* outputs. */
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static const struct snd_soc_dapm_route lm4857_routes[] = {
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{"LS", NULL, "IN"},
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{"HP", NULL, "IN"},
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{"EP", NULL, "IN"},
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};
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static int lm4857_probe(struct snd_soc_codec *codec)
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{
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struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
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struct snd_soc_dapm_context *dapm = &codec->dapm;
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int ret;
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codec->control_data = lm4857->i2c;
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ret = snd_soc_add_controls(codec, lm4857_controls,
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ARRAY_SIZE(lm4857_controls));
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if (ret)
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return ret;
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ret = snd_soc_dapm_new_controls(dapm, lm4857_dapm_widgets,
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ARRAY_SIZE(lm4857_dapm_widgets));
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if (ret)
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return ret;
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ret = snd_soc_dapm_add_routes(dapm, lm4857_routes,
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ARRAY_SIZE(lm4857_routes));
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if (ret)
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return ret;
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snd_soc_dapm_new_widgets(dapm);
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return 0;
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}
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static struct snd_soc_codec_driver soc_codec_dev_lm4857 = {
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.write = lm4857_write,
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.read = lm4857_read,
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.probe = lm4857_probe,
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.reg_cache_size = ARRAY_SIZE(lm4857_default_regs),
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.reg_word_size = sizeof(uint8_t),
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.reg_cache_default = lm4857_default_regs,
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.set_bias_level = lm4857_set_bias_level,
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};
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static int __devinit lm4857_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 lm4857 *lm4857;
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int ret;
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lm4857 = kzalloc(sizeof(*lm4857), GFP_KERNEL);
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if (!lm4857)
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return -ENOMEM;
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i2c_set_clientdata(i2c, lm4857);
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lm4857->i2c = i2c;
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ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_lm4857, NULL, 0);
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if (ret) {
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kfree(lm4857);
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return ret;
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}
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return 0;
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}
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static int __devexit lm4857_i2c_remove(struct i2c_client *i2c)
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{
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struct lm4857 *lm4857 = i2c_get_clientdata(i2c);
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snd_soc_unregister_codec(&i2c->dev);
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kfree(lm4857);
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return 0;
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}
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static const struct i2c_device_id lm4857_i2c_id[] = {
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{ "lm4857", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
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static struct i2c_driver lm4857_i2c_driver = {
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.driver = {
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.name = "lm4857",
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.owner = THIS_MODULE,
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},
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.probe = lm4857_i2c_probe,
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.remove = __devexit_p(lm4857_i2c_remove),
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.id_table = lm4857_i2c_id,
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};
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static int __init lm4857_init(void)
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{
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return i2c_add_driver(&lm4857_i2c_driver);
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}
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module_init(lm4857_init);
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static void __exit lm4857_exit(void)
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{
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i2c_del_driver(&lm4857_i2c_driver);
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}
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module_exit(lm4857_exit);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("LM4857 amplifier driver");
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MODULE_LICENSE("GPL");
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