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_kcontrol_chip(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_kcontrol_chip(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 const struct soc_enum lm4857_mode_enum = 105 SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(lm4857_mode), lm4857_mode); 106 107 static const struct snd_soc_dapm_widget lm4857_dapm_widgets[] = { 108 SND_SOC_DAPM_INPUT("IN"), 109 110 SND_SOC_DAPM_OUTPUT("LS"), 111 SND_SOC_DAPM_OUTPUT("HP"), 112 SND_SOC_DAPM_OUTPUT("EP"), 113 }; 114 115 static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0); 116 static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0); 117 118 static const struct snd_kcontrol_new lm4857_controls[] = { 119 SOC_SINGLE_TLV("Left Playback Volume", LM4857_LVOL, 0, 31, 0, 120 stereo_tlv), 121 SOC_SINGLE_TLV("Right Playback Volume", LM4857_RVOL, 0, 31, 0, 122 stereo_tlv), 123 SOC_SINGLE_TLV("Mono Playback Volume", LM4857_MVOL, 0, 31, 0, 124 mono_tlv), 125 SOC_SINGLE("Spk 3D Playback Switch", LM4857_LVOL, LM4857_3D, 1, 0), 126 SOC_SINGLE("HP 3D Playback Switch", LM4857_RVOL, LM4857_3D, 1, 0), 127 SOC_SINGLE("Fast Wakeup Playback Switch", LM4857_CTRL, 128 LM4857_WAKEUP, 1, 0), 129 SOC_SINGLE("Earpiece 6dB Playback Switch", LM4857_CTRL, 130 LM4857_EPGAIN, 1, 0), 131 132 SOC_ENUM_EXT("Mode", lm4857_mode_enum, 133 lm4857_get_mode, lm4857_set_mode), 134 }; 135 136 /* There is a demux between the input signal and the output signals. 137 * Currently there is no easy way to model it in ASoC and since it does not make 138 * much of a difference in practice simply connect the input direclty to the 139 * outputs. */ 140 static const struct snd_soc_dapm_route lm4857_routes[] = { 141 {"LS", NULL, "IN"}, 142 {"HP", NULL, "IN"}, 143 {"EP", NULL, "IN"}, 144 }; 145 146 static struct snd_soc_codec_driver soc_codec_dev_lm4857 = { 147 .set_bias_level = lm4857_set_bias_level, 148 149 .controls = lm4857_controls, 150 .num_controls = ARRAY_SIZE(lm4857_controls), 151 .dapm_widgets = lm4857_dapm_widgets, 152 .num_dapm_widgets = ARRAY_SIZE(lm4857_dapm_widgets), 153 .dapm_routes = lm4857_routes, 154 .num_dapm_routes = ARRAY_SIZE(lm4857_routes), 155 }; 156 157 static const struct regmap_config lm4857_regmap_config = { 158 .val_bits = 6, 159 .reg_bits = 2, 160 161 .max_register = LM4857_CTRL, 162 163 .cache_type = REGCACHE_FLAT, 164 .reg_defaults = lm4857_default_regs, 165 .num_reg_defaults = ARRAY_SIZE(lm4857_default_regs), 166 }; 167 168 static int lm4857_i2c_probe(struct i2c_client *i2c, 169 const struct i2c_device_id *id) 170 { 171 struct lm4857 *lm4857; 172 173 lm4857 = devm_kzalloc(&i2c->dev, sizeof(*lm4857), GFP_KERNEL); 174 if (!lm4857) 175 return -ENOMEM; 176 177 i2c_set_clientdata(i2c, lm4857); 178 179 lm4857->regmap = devm_regmap_init_i2c(i2c, &lm4857_regmap_config); 180 if (IS_ERR(lm4857->regmap)) 181 return PTR_ERR(lm4857->regmap); 182 183 return snd_soc_register_codec(&i2c->dev, &soc_codec_dev_lm4857, NULL, 0); 184 } 185 186 static int lm4857_i2c_remove(struct i2c_client *i2c) 187 { 188 snd_soc_unregister_codec(&i2c->dev); 189 return 0; 190 } 191 192 static const struct i2c_device_id lm4857_i2c_id[] = { 193 { "lm4857", 0 }, 194 { } 195 }; 196 MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id); 197 198 static struct i2c_driver lm4857_i2c_driver = { 199 .driver = { 200 .name = "lm4857", 201 .owner = THIS_MODULE, 202 }, 203 .probe = lm4857_i2c_probe, 204 .remove = lm4857_i2c_remove, 205 .id_table = lm4857_i2c_id, 206 }; 207 208 module_i2c_driver(lm4857_i2c_driver); 209 210 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); 211 MODULE_DESCRIPTION("LM4857 amplifier driver"); 212 MODULE_LICENSE("GPL"); 213