kernel/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
  26 static 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
  44 static const unsigned int lm4857_mode_values[] = {
  45         0,
  46         6,
  47         7,
  48         8,
  49         9,
  50 };
  51
  52 static const char * const lm4857_mode_texts[] = {
  53         "Off",
  54         "Earpiece",
  55         "Loudspeaker",
  56         "Loudspeaker + Headphone",
  57         "Headphone",
  58 };
  59
  60 static SOC_VALUE_ENUM_SINGLE_AUTODISABLE_DECL(lm4857_mode_enum,
  61         LM4857_CTRL, 0, 0xf, lm4857_mode_texts, lm4857_mode_values);
  62
  63 static const struct snd_kcontrol_new lm4857_mode_ctrl =
  64         SOC_DAPM_ENUM("Mode", lm4857_mode_enum);
  65
  66 static 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
  76 static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
  77 static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
  78
  79 static 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
  94 static 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
 103 static 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
 112 static 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
 123 static 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
 136 static const struct i2c_device_id lm4857_i2c_id[] = {
 137         { "lm4857", 0 },
 138         { }
 139 };
 140 MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
 141
 142 static 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
 150 module_i2c_driver(lm4857_i2c_driver);
 151
 152 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 153 MODULE_DESCRIPTION("LM4857 amplifier driver");
 154 MODULE_LICENSE("GPL");