LXR linux/sound/soc/codecs/lm4857.c

   1/*
   2 * LM4857 AMP driver
   3 *
   4 * Copyright 2007 Wolfson Microelectronics PLC.
   5 * Author: Graeme Gregory
   6 *         graeme.gregory@wolfsonmicro.com
   7 * Copyright 2011 Lars-Peter Clausen <lars@metafoo.de>
   8 *
   9 *  This program is free software; you can redistribute  it and/or modify it
  10 *  under  the terms of  the GNU General  Public License as published by the
  11 *  Free Software Foundation;  either version 2 of the  License, or (at your
  12 *  option) any later version.
  13 *
  14 */
  15
  16#include <linux/init.h>
  17#include <linux/module.h>
  18#include <linux/i2c.h>
  19#include <linux/regmap.h>
  20#include <linux/slab.h>
  21
  22#include <sound/core.h>
  23#include <sound/soc.h>
  24#include <sound/tlv.h>
  25
  26static const struct reg_default lm4857_default_regs[] = {
  27        { 0x0, 0x00 },
  28        { 0x1, 0x00 },
  29        { 0x2, 0x00 },
  30        { 0x3, 0x00 },
  31};
  32
  33/* The register offsets in the cache array */
  34#define LM4857_MVOL 0
  35#define LM4857_LVOL 1
  36#define LM4857_RVOL 2
  37#define LM4857_CTRL 3
  38
  39/* the shifts required to set these bits */
  40#define LM4857_3D 5
  41#define LM4857_WAKEUP 5
  42#define LM4857_EPGAIN 4
  43
  44static const unsigned int lm4857_mode_values[] = {
  45        0,
  46        6,
  47        7,
  48        8,
  49        9,
  50};
  51
  52static const char * const lm4857_mode_texts[] = {
  53        "Off",
  54        "Earpiece",
  55        "Loudspeaker",
  56        "Loudspeaker + Headphone",
  57        "Headphone",
  58};
  59
  60static SOC_VALUE_ENUM_SINGLE_AUTODISABLE_DECL(lm4857_mode_enum,
  61        LM4857_CTRL, 0, 0xf, lm4857_mode_texts, lm4857_mode_values);
  62
  63static const struct snd_kcontrol_new lm4857_mode_ctrl =
  64        SOC_DAPM_ENUM("Mode", lm4857_mode_enum);
  65
  66static const struct snd_soc_dapm_widget lm4857_dapm_widgets[] = {
  67        SND_SOC_DAPM_INPUT("IN"),
  68
  69        SND_SOC_DAPM_DEMUX("Mode", SND_SOC_NOPM, 0, 0, &lm4857_mode_ctrl),
  70
  71        SND_SOC_DAPM_OUTPUT("LS"),
  72        SND_SOC_DAPM_OUTPUT("HP"),
  73        SND_SOC_DAPM_OUTPUT("EP"),
  74};
  75
  76static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
  77static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
  78
  79static const struct snd_kcontrol_new lm4857_controls[] = {
  80        SOC_SINGLE_TLV("Left Playback Volume", LM4857_LVOL, 0, 31, 0,
  81                stereo_tlv),
  82        SOC_SINGLE_TLV("Right Playback Volume", LM4857_RVOL, 0, 31, 0,
  83                stereo_tlv),
  84        SOC_SINGLE_TLV("Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
  85                mono_tlv),
  86        SOC_SINGLE("Spk 3D Playback Switch", LM4857_LVOL, LM4857_3D, 1, 0),
  87        SOC_SINGLE("HP 3D Playback Switch", LM4857_RVOL, LM4857_3D, 1, 0),
  88        SOC_SINGLE("Fast Wakeup Playback Switch", LM4857_CTRL,
  89                LM4857_WAKEUP, 1, 0),
  90        SOC_SINGLE("Earpiece 6dB Playback Switch", LM4857_CTRL,
  91                LM4857_EPGAIN, 1, 0),
  92};
  93
  94static const struct snd_soc_dapm_route lm4857_routes[] = {
  95        { "Mode", NULL, "IN" },
  96        { "LS", "Loudspeaker", "Mode" },
  97        { "LS", "Loudspeaker + Headphone", "Mode" },
  98        { "HP", "Headphone", "Mode" },
  99        { "HP", "Loudspeaker + Headphone", "Mode" },
 100        { "EP", "Earpiece", "Mode" },
 101};
 102
 103static struct snd_soc_component_driver lm4857_component_driver = {
 104        .controls = lm4857_controls,
 105        .num_controls = ARRAY_SIZE(lm4857_controls),
 106        .dapm_widgets = lm4857_dapm_widgets,
 107        .num_dapm_widgets = ARRAY_SIZE(lm4857_dapm_widgets),
 108        .dapm_routes = lm4857_routes,
 109        .num_dapm_routes = ARRAY_SIZE(lm4857_routes),
 110};
 111
 112static const struct regmap_config lm4857_regmap_config = {
 113        .val_bits = 6,
 114        .reg_bits = 2,
 115
 116        .max_register = LM4857_CTRL,
 117
 118        .cache_type = REGCACHE_FLAT,
 119        .reg_defaults = lm4857_default_regs,
 120        .num_reg_defaults = ARRAY_SIZE(lm4857_default_regs),
 121};
 122
 123static int lm4857_i2c_probe(struct i2c_client *i2c,
 124                            const struct i2c_device_id *id)
 125{
 126        struct regmap *regmap;
 127
 128        regmap = devm_regmap_init_i2c(i2c, &lm4857_regmap_config);
 129        if (IS_ERR(regmap))
 130                return PTR_ERR(regmap);
 131
 132        return devm_snd_soc_register_component(&i2c->dev,
 133                &lm4857_component_driver, NULL, 0);
 134}
 135
 136static const struct i2c_device_id lm4857_i2c_id[] = {
 137        { "lm4857", 0 },
 138        { }
 139};
 140MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
 141
 142static struct i2c_driver lm4857_i2c_driver = {
 143        .driver = {
 144                .name = "lm4857",
 145        },
 146        .probe = lm4857_i2c_probe,
 147        .id_table = lm4857_i2c_id,
 148};
 149
 150module_i2c_driver(lm4857_i2c_driver);
 151
 152MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 153MODULE_DESCRIPTION("LM4857 amplifier driver");
 154MODULE_LICENSE("GPL");
 155