4 * Copyright 2007 Wolfson Microelectronics PLC.
5 * Author: Graeme Gregory
6 * graeme.gregory@wolfsonmicro.com
7 * Copyright 2011 Lars-Peter Clausen <lars@metafoo.de>
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.
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>
22 #include <sound/core.h>
23 #include <sound/soc.h>
24 #include <sound/tlv.h>
27 struct regmap *regmap;
31 static const struct reg_default lm4857_default_regs[] = {
38 /* The register offsets in the cache array */
44 /* the shifts required to set these bits */
46 #define LM4857_WAKEUP 5
47 #define LM4857_EPGAIN 4
49 static int lm4857_get_mode(struct snd_kcontrol *kcontrol,
50 struct snd_ctl_elem_value *ucontrol)
52 struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
53 struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
55 ucontrol->value.integer.value[0] = lm4857->mode;
60 static int lm4857_set_mode(struct snd_kcontrol *kcontrol,
61 struct snd_ctl_elem_value *ucontrol)
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];
69 if (codec->dapm.bias_level == SND_SOC_BIAS_ON)
70 regmap_update_bits(lm4857->regmap, LM4857_CTRL, 0x0F, value + 6);
75 static int lm4857_set_bias_level(struct snd_soc_codec *codec,
76 enum snd_soc_bias_level level)
78 struct lm4857 *lm4857 = snd_soc_codec_get_drvdata(codec);
82 regmap_update_bits(lm4857->regmap, LM4857_CTRL, 0x0F,
85 case SND_SOC_BIAS_STANDBY:
86 regmap_update_bits(lm4857->regmap, LM4857_CTRL, 0x0F, 0);
92 codec->dapm.bias_level = level;
97 static const char *lm4857_mode[] = {
100 "Loudspeaker + Headphone",
104 static SOC_ENUM_SINGLE_EXT_DECL(lm4857_mode_enum, lm4857_mode);
106 static const struct snd_soc_dapm_widget lm4857_dapm_widgets[] = {
107 SND_SOC_DAPM_INPUT("IN"),
109 SND_SOC_DAPM_OUTPUT("LS"),
110 SND_SOC_DAPM_OUTPUT("HP"),
111 SND_SOC_DAPM_OUTPUT("EP"),
114 static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
115 static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
117 static const struct snd_kcontrol_new lm4857_controls[] = {
118 SOC_SINGLE_TLV("Left Playback Volume", LM4857_LVOL, 0, 31, 0,
120 SOC_SINGLE_TLV("Right Playback Volume", LM4857_RVOL, 0, 31, 0,
122 SOC_SINGLE_TLV("Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
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),
131 SOC_ENUM_EXT("Mode", lm4857_mode_enum,
132 lm4857_get_mode, lm4857_set_mode),
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
139 static const struct snd_soc_dapm_route lm4857_routes[] = {
145 static struct snd_soc_codec_driver soc_codec_dev_lm4857 = {
146 .set_bias_level = lm4857_set_bias_level,
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),
156 static const struct regmap_config lm4857_regmap_config = {
160 .max_register = LM4857_CTRL,
162 .cache_type = REGCACHE_FLAT,
163 .reg_defaults = lm4857_default_regs,
164 .num_reg_defaults = ARRAY_SIZE(lm4857_default_regs),
167 static int lm4857_i2c_probe(struct i2c_client *i2c,
168 const struct i2c_device_id *id)
170 struct lm4857 *lm4857;
172 lm4857 = devm_kzalloc(&i2c->dev, sizeof(*lm4857), GFP_KERNEL);
176 i2c_set_clientdata(i2c, lm4857);
178 lm4857->regmap = devm_regmap_init_i2c(i2c, &lm4857_regmap_config);
179 if (IS_ERR(lm4857->regmap))
180 return PTR_ERR(lm4857->regmap);
182 return snd_soc_register_codec(&i2c->dev, &soc_codec_dev_lm4857, NULL, 0);
185 static int lm4857_i2c_remove(struct i2c_client *i2c)
187 snd_soc_unregister_codec(&i2c->dev);
191 static const struct i2c_device_id lm4857_i2c_id[] = {
195 MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
197 static struct i2c_driver lm4857_i2c_driver = {
200 .owner = THIS_MODULE,
202 .probe = lm4857_i2c_probe,
203 .remove = lm4857_i2c_remove,
204 .id_table = lm4857_i2c_id,
207 module_i2c_driver(lm4857_i2c_driver);
209 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
210 MODULE_DESCRIPTION("LM4857 amplifier driver");
211 MODULE_LICENSE("GPL");