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/slab.h>
  20
  21 #include <sound/core.h>
  22 #include <sound/soc.h>
  23 #include <sound/tlv.h>
  24
  25 struct lm4857 {
  26         struct i2c_client *i2c;
  27         uint8_t mode;
  28 };
  29
  30 static const uint8_t lm4857_default_regs[] = {
  31         0x00, 0x00, 0x00, 0x00,
  32 };
  33
  34 /* The register offsets in the cache array */
  35 #define LM4857_MVOL 0
  36 #define LM4857_LVOL 1
  37 #define LM4857_RVOL 2
  38 #define LM4857_CTRL 3
  39
  40 /* the shifts required to set these bits */
  41 #define LM4857_3D 5
  42 #define LM4857_WAKEUP 5
  43 #define LM4857_EPGAIN 4
  44
  45 static int lm4857_write(struct snd_soc_codec *codec, unsigned int reg,
  46                 unsigned int value)
  47 {
  48         uint8_t data;
  49         int ret;
  50
  51         ret = snd_soc_cache_write(codec, reg, value);
  52         if (ret < 0)
  53                 return ret;
  54
  55         data = (reg << 6) | value;
  56         ret = i2c_master_send(codec->control_data, &data, 1);
  57         if (ret != 1) {
  58                 dev_err(codec->dev, "Failed to write register: %d\n", ret);
  59                 return ret;
  60         }
  61
  62         return 0;
  63 }
  64
  65 static unsigned int lm4857_read(struct snd_soc_codec *codec,
  66                 unsigned int reg)
  67 {
  68         unsigned int val;
  69         int ret;
  70
  71         ret = snd_soc_cache_read(codec, reg, &val);
  72         if (ret)
  73                 return -1;
  74
  75         return val;
  76 }
  77
  78 static int lm4857_get_mode(struct snd_kcontrol *kcontrol,
  79         struct snd_ctl_elem_value *ucontrol)
  80 {
  81         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
  82         struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
  83
  84         ucontrol->value.integer.value[0] = lm4857->mode;
  85
  86         return 0;
  87 }
  88
  89 static int lm4857_set_mode(struct snd_kcontrol *kcontrol,
  90         struct snd_ctl_elem_value *ucontrol)
  91 {
  92         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
  93         struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
  94         uint8_t value = ucontrol->value.integer.value[0];
  95
  96         lm4857->mode = value;
  97
  98         if (codec->dapm.bias_level == SND_SOC_BIAS_ON)
  99                 snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, value + 6);
 100
 101         return 1;
 102 }
 103
 104 static int lm4857_set_bias_level(struct snd_soc_codec *codec,
 105                                  enum snd_soc_bias_level level)
 106 {
 107         struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
 108
 109         switch (level) {
 110         case SND_SOC_BIAS_ON:
 111                 snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, lm4857->mode + 6);
 112                 break;
 113         case SND_SOC_BIAS_STANDBY:
 114                 snd_soc_update_bits(codec, LM4857_CTRL, 0x0F, 0);
 115                 break;
 116         default:
 117                 break;
 118         }
 119
 120         codec->dapm.bias_level = level;
 121
 122         return 0;
 123 }
 124
 125 static const char *lm4857_mode[] = {
 126         "Earpiece",
 127         "Loudspeaker",
 128         "Loudspeaker + Headphone",
 129         "Headphone",
 130 };
 131
 132 static const struct soc_enum lm4857_mode_enum =
 133         SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(lm4857_mode), lm4857_mode);
 134
 135 static const struct snd_soc_dapm_widget lm4857_dapm_widgets[] = {
 136         SND_SOC_DAPM_INPUT("IN"),
 137
 138         SND_SOC_DAPM_OUTPUT("LS"),
 139         SND_SOC_DAPM_OUTPUT("HP"),
 140         SND_SOC_DAPM_OUTPUT("EP"),
 141 };
 142
 143 static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
 144 static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
 145
 146 static const struct snd_kcontrol_new lm4857_controls[] = {
 147         SOC_SINGLE_TLV("Left Playback Volume", LM4857_LVOL, 0, 31, 0,
 148                 stereo_tlv),
 149         SOC_SINGLE_TLV("Right Playback Volume", LM4857_RVOL, 0, 31, 0,
 150                 stereo_tlv),
 151         SOC_SINGLE_TLV("Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
 152                 mono_tlv),
 153         SOC_SINGLE("Spk 3D Playback Switch", LM4857_LVOL, LM4857_3D, 1, 0),
 154         SOC_SINGLE("HP 3D Playback Switch", LM4857_RVOL, LM4857_3D, 1, 0),
 155         SOC_SINGLE("Fast Wakeup Playback Switch", LM4857_CTRL,
 156                 LM4857_WAKEUP, 1, 0),
 157         SOC_SINGLE("Earpiece 6dB Playback Switch", LM4857_CTRL,
 158                 LM4857_EPGAIN, 1, 0),
 159
 160         SOC_ENUM_EXT("Mode", lm4857_mode_enum,
 161                 lm4857_get_mode, lm4857_set_mode),
 162 };
 163
 164 /* There is a demux between the input signal and the output signals.
 165  * Currently there is no easy way to model it in ASoC and since it does not make
 166  * much of a difference in practice simply connect the input direclty to the
 167  * outputs. */
 168 static const struct snd_soc_dapm_route lm4857_routes[] = {
 169         {"LS", NULL, "IN"},
 170         {"HP", NULL, "IN"},
 171         {"EP", NULL, "IN"},
 172 };
 173
 174 static int lm4857_probe(struct snd_soc_codec *codec)
 175 {
 176         struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
 177         struct snd_soc_dapm_context *dapm = &codec->dapm;
 178         int ret;
 179
 180         codec->control_data = lm4857->i2c;
 181
 182         ret = snd_soc_add_codec_controls(codec, lm4857_controls,
 183                         ARRAY_SIZE(lm4857_controls));
 184         if (ret)
 185                 return ret;
 186
 187         ret = snd_soc_dapm_new_controls(dapm, lm4857_dapm_widgets,
 188                         ARRAY_SIZE(lm4857_dapm_widgets));
 189         if (ret)
 190                 return ret;
 191
 192         ret = snd_soc_dapm_add_routes(dapm, lm4857_routes,
 193                         ARRAY_SIZE(lm4857_routes));
 194         if (ret)
 195                 return ret;
 196
 197         snd_soc_dapm_new_widgets(dapm);
 198
 199         return 0;
 200 }
 201
 202 static struct snd_soc_codec_driver soc_codec_dev_lm4857 = {
 203         .write = lm4857_write,
 204         .read = lm4857_read,
 205         .probe = lm4857_probe,
 206         .reg_cache_size = ARRAY_SIZE(lm4857_default_regs),
 207         .reg_word_size = sizeof(uint8_t),
 208         .reg_cache_default = lm4857_default_regs,
 209         .set_bias_level = lm4857_set_bias_level,
 210 };
 211
 212 static int lm4857_i2c_probe(struct i2c_client *i2c,
 213                             const struct i2c_device_id *id)
 214 {
 215         struct lm4857 *lm4857;
 216         int ret;
 217
 218         lm4857 = devm_kzalloc(&i2c->dev, sizeof(*lm4857), GFP_KERNEL);
 219         if (!lm4857)
 220                 return -ENOMEM;
 221
 222         i2c_set_clientdata(i2c, lm4857);
 223
 224         lm4857->i2c = i2c;
 225
 226         ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_lm4857, NULL, 0);
 227
 228         return ret;
 229 }
 230
 231 static int lm4857_i2c_remove(struct i2c_client *i2c)
 232 {
 233         snd_soc_unregister_codec(&i2c->dev);
 234         return 0;
 235 }
 236
 237 static const struct i2c_device_id lm4857_i2c_id[] = {
 238         { "lm4857", 0 },
 239         { }
 240 };
 241 MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
 242
 243 static struct i2c_driver lm4857_i2c_driver = {
 244         .driver = {
 245                 .name = "lm4857",
 246                 .owner = THIS_MODULE,
 247         },
 248         .probe = lm4857_i2c_probe,
 249         .remove = lm4857_i2c_remove,
 250         .id_table = lm4857_i2c_id,
 251 };
 252
 253 module_i2c_driver(lm4857_i2c_driver);
 254
 255 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 256 MODULE_DESCRIPTION("LM4857 amplifier driver");
 257 MODULE_LICENSE("GPL");