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 struct lm4857 {
  27         struct regmap *regmap;
  28         uint8_t mode;
  29 };
  30
  31 static const struct reg_default lm4857_default_regs[] = {
  32         { 0x0, 0x00 },
  33         { 0x1, 0x00 },
  34         { 0x2, 0x00 },
  35         { 0x3, 0x00 },
  36 };
  37
  38 /* The register offsets in the cache array */
  39 #define LM4857_MVOL 0
  40 #define LM4857_LVOL 1
  41 #define LM4857_RVOL 2
  42 #define LM4857_CTRL 3
  43
  44 /* the shifts required to set these bits */
  45 #define LM4857_3D 5
  46 #define LM4857_WAKEUP 5
  47 #define LM4857_EPGAIN 4
  48
  49 static int lm4857_get_mode(struct snd_kcontrol *kcontrol,
  50         struct snd_ctl_elem_value *ucontrol)
  51 {
  52         struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
  53         struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
  54
  55         ucontrol->value.integer.value[0] = lm4857->mode;
  56
  57         return 0;
  58 }
  59
  60 static int lm4857_set_mode(struct snd_kcontrol *kcontrol,
  61         struct snd_ctl_elem_value *ucontrol)
  62 {
  63         struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
  64         struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
  65         uint8_t value = ucontrol->value.integer.value[0];
  66
  67         lm4857->mode = value;
  68
  69         if (codec->dapm.bias_level == SND_SOC_BIAS_ON)
  70                 regmap_update_bits(lm4857->regmap, LM4857_CTRL, 0x0F, value + 6);
  71
  72         return 1;
  73 }
  74
  75 static int lm4857_set_bias_level(struct snd_soc_codec *codec,
  76                                  enum snd_soc_bias_level level)
  77 {
  78         struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
  79
  80         switch (level) {
  81         case SND_SOC_BIAS_ON:
  82                 regmap_update_bits(lm4857->regmap, LM4857_CTRL, 0x0F,
  83                         lm4857->mode + 6);
  84                 break;
  85         case SND_SOC_BIAS_STANDBY:
  86                 regmap_update_bits(lm4857->regmap, LM4857_CTRL, 0x0F, 0);
  87                 break;
  88         default:
  89                 break;
  90         }
  91
  92         codec->dapm.bias_level = level;
  93
  94         return 0;
  95 }
  96
  97 static const char *lm4857_mode[] = {
  98         "Earpiece",
  99         "Loudspeaker",
 100         "Loudspeaker + Headphone",
 101         "Headphone",
 102 };
 103
 104 static SOC_ENUM_SINGLE_EXT_DECL(lm4857_mode_enum, lm4857_mode);
 105
 106 static const struct snd_soc_dapm_widget lm4857_dapm_widgets[] = {
 107         SND_SOC_DAPM_INPUT("IN"),
 108
 109         SND_SOC_DAPM_OUTPUT("LS"),
 110         SND_SOC_DAPM_OUTPUT("HP"),
 111         SND_SOC_DAPM_OUTPUT("EP"),
 112 };
 113
 114 static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
 115 static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
 116
 117 static const struct snd_kcontrol_new lm4857_controls[] = {
 118         SOC_SINGLE_TLV("Left Playback Volume", LM4857_LVOL, 0, 31, 0,
 119                 stereo_tlv),
 120         SOC_SINGLE_TLV("Right Playback Volume", LM4857_RVOL, 0, 31, 0,
 121                 stereo_tlv),
 122         SOC_SINGLE_TLV("Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
 123                 mono_tlv),
 124         SOC_SINGLE("Spk 3D Playback Switch", LM4857_LVOL, LM4857_3D, 1, 0),
 125         SOC_SINGLE("HP 3D Playback Switch", LM4857_RVOL, LM4857_3D, 1, 0),
 126         SOC_SINGLE("Fast Wakeup Playback Switch", LM4857_CTRL,
 127                 LM4857_WAKEUP, 1, 0),
 128         SOC_SINGLE("Earpiece 6dB Playback Switch", LM4857_CTRL,
 129                 LM4857_EPGAIN, 1, 0),
 130
 131         SOC_ENUM_EXT("Mode", lm4857_mode_enum,
 132                 lm4857_get_mode, lm4857_set_mode),
 133 };
 134
 135 /* There is a demux between the input signal and the output signals.
 136  * Currently there is no easy way to model it in ASoC and since it does not make
 137  * much of a difference in practice simply connect the input direclty to the
 138  * outputs. */
 139 static const struct snd_soc_dapm_route lm4857_routes[] = {
 140         {"LS", NULL, "IN"},
 141         {"HP", NULL, "IN"},
 142         {"EP", NULL, "IN"},
 143 };
 144
 145 static struct snd_soc_codec_driver soc_codec_dev_lm4857 = {
 146         .set_bias_level = lm4857_set_bias_level,
 147
 148         .controls = lm4857_controls,
 149         .num_controls = ARRAY_SIZE(lm4857_controls),
 150         .dapm_widgets = lm4857_dapm_widgets,
 151         .num_dapm_widgets = ARRAY_SIZE(lm4857_dapm_widgets),
 152         .dapm_routes = lm4857_routes,
 153         .num_dapm_routes = ARRAY_SIZE(lm4857_routes),
 154 };
 155
 156 static const struct regmap_config lm4857_regmap_config = {
 157         .val_bits = 6,
 158         .reg_bits = 2,
 159
 160         .max_register = LM4857_CTRL,
 161
 162         .cache_type = REGCACHE_FLAT,
 163         .reg_defaults = lm4857_default_regs,
 164         .num_reg_defaults = ARRAY_SIZE(lm4857_default_regs),
 165 };
 166
 167 static int lm4857_i2c_probe(struct i2c_client *i2c,
 168                             const struct i2c_device_id *id)
 169 {
 170         struct lm4857 *lm4857;
 171
 172         lm4857 = devm_kzalloc(&i2c->dev, sizeof(*lm4857), GFP_KERNEL);
 173         if (!lm4857)
 174                 return -ENOMEM;
 175
 176         i2c_set_clientdata(i2c, lm4857);
 177
 178         lm4857->regmap = devm_regmap_init_i2c(i2c, &lm4857_regmap_config);
 179         if (IS_ERR(lm4857->regmap))
 180                 return PTR_ERR(lm4857->regmap);
 181
 182         return snd_soc_register_codec(&i2c->dev, &soc_codec_dev_lm4857, NULL, 0);
 183 }
 184
 185 static int lm4857_i2c_remove(struct i2c_client *i2c)
 186 {
 187         snd_soc_unregister_codec(&i2c->dev);
 188         return 0;
 189 }
 190
 191 static const struct i2c_device_id lm4857_i2c_id[] = {
 192         { "lm4857", 0 },
 193         { }
 194 };
 195 MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
 196
 197 static struct i2c_driver lm4857_i2c_driver = {
 198         .driver = {
 199                 .name = "lm4857",
 200                 .owner = THIS_MODULE,
 201         },
 202         .probe = lm4857_i2c_probe,
 203         .remove = lm4857_i2c_remove,
 204         .id_table = lm4857_i2c_id,
 205 };
 206
 207 module_i2c_driver(lm4857_i2c_driver);
 208
 209 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 210 MODULE_DESCRIPTION("LM4857 amplifier driver");
 211 MODULE_LICENSE("GPL");