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"); 212