root/sound/soc/codecs/lm4857.c

DEFINITIONS

1. lm4857_i2c_probe

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * LM4857 AMP driver
   4  *
   5  * Copyright 2007 Wolfson Microelectronics PLC.
   6  * Author: Graeme Gregory
   7  *         graeme.gregory@wolfsonmicro.com
   8  * Copyright 2011 Lars-Peter Clausen <lars@metafoo.de>
   9  */
  10 
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/i2c.h>
  14 #include <linux/regmap.h>
  15 #include <linux/slab.h>
  16 
  17 #include <sound/core.h>
  18 #include <sound/soc.h>
  19 #include <sound/tlv.h>
  20 
  21 static const struct reg_default lm4857_default_regs[] = {
  22         { 0x0, 0x00 },
  23         { 0x1, 0x00 },
  24         { 0x2, 0x00 },
  25         { 0x3, 0x00 },
  26 };
  27 
  28 /* The register offsets in the cache array */
  29 #define LM4857_MVOL 0
  30 #define LM4857_LVOL 1
  31 #define LM4857_RVOL 2
  32 #define LM4857_CTRL 3
  33 
  34 /* the shifts required to set these bits */
  35 #define LM4857_3D 5
  36 #define LM4857_WAKEUP 5
  37 #define LM4857_EPGAIN 4
  38 
  39 static const unsigned int lm4857_mode_values[] = {
  40         0,
  41         6,
  42         7,
  43         8,
  44         9,
  45 };
  46 
  47 static const char * const lm4857_mode_texts[] = {
  48         "Off",
  49         "Earpiece",
  50         "Loudspeaker",
  51         "Loudspeaker + Headphone",
  52         "Headphone",
  53 };
  54 
  55 static SOC_VALUE_ENUM_SINGLE_AUTODISABLE_DECL(lm4857_mode_enum,
  56         LM4857_CTRL, 0, 0xf, lm4857_mode_texts, lm4857_mode_values);
  57 
  58 static const struct snd_kcontrol_new lm4857_mode_ctrl =
  59         SOC_DAPM_ENUM("Mode", lm4857_mode_enum);
  60 
  61 static const struct snd_soc_dapm_widget lm4857_dapm_widgets[] = {
  62         SND_SOC_DAPM_INPUT("IN"),
  63 
  64         SND_SOC_DAPM_DEMUX("Mode", SND_SOC_NOPM, 0, 0, &lm4857_mode_ctrl),
  65 
  66         SND_SOC_DAPM_OUTPUT("LS"),
  67         SND_SOC_DAPM_OUTPUT("HP"),
  68         SND_SOC_DAPM_OUTPUT("EP"),
  69 };
  70 
  71 static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
  72 static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
  73 
  74 static const struct snd_kcontrol_new lm4857_controls[] = {
  75         SOC_SINGLE_TLV("Left Playback Volume", LM4857_LVOL, 0, 31, 0,
  76                 stereo_tlv),
  77         SOC_SINGLE_TLV("Right Playback Volume", LM4857_RVOL, 0, 31, 0,
  78                 stereo_tlv),
  79         SOC_SINGLE_TLV("Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
  80                 mono_tlv),
  81         SOC_SINGLE("Spk 3D Playback Switch", LM4857_LVOL, LM4857_3D, 1, 0),
  82         SOC_SINGLE("HP 3D Playback Switch", LM4857_RVOL, LM4857_3D, 1, 0),
  83         SOC_SINGLE("Fast Wakeup Playback Switch", LM4857_CTRL,
  84                 LM4857_WAKEUP, 1, 0),
  85         SOC_SINGLE("Earpiece 6dB Playback Switch", LM4857_CTRL,
  86                 LM4857_EPGAIN, 1, 0),
  87 };
  88 
  89 static const struct snd_soc_dapm_route lm4857_routes[] = {
  90         { "Mode", NULL, "IN" },
  91         { "LS", "Loudspeaker", "Mode" },
  92         { "LS", "Loudspeaker + Headphone", "Mode" },
  93         { "HP", "Headphone", "Mode" },
  94         { "HP", "Loudspeaker + Headphone", "Mode" },
  95         { "EP", "Earpiece", "Mode" },
  96 };
  97 
  98 static const struct snd_soc_component_driver lm4857_component_driver = {
  99         .controls = lm4857_controls,
 100         .num_controls = ARRAY_SIZE(lm4857_controls),
 101         .dapm_widgets = lm4857_dapm_widgets,
 102         .num_dapm_widgets = ARRAY_SIZE(lm4857_dapm_widgets),
 103         .dapm_routes = lm4857_routes,
 104         .num_dapm_routes = ARRAY_SIZE(lm4857_routes),
 105 };
 106 
 107 static const struct regmap_config lm4857_regmap_config = {
 108         .val_bits = 6,
 109         .reg_bits = 2,
 110 
 111         .max_register = LM4857_CTRL,
 112 
 113         .cache_type = REGCACHE_FLAT,
 114         .reg_defaults = lm4857_default_regs,
 115         .num_reg_defaults = ARRAY_SIZE(lm4857_default_regs),
 116 };
 117 
 118 static int lm4857_i2c_probe(struct i2c_client *i2c,
 119                             const struct i2c_device_id *id)
 120 {
 121         struct regmap *regmap;
 122 
 123         regmap = devm_regmap_init_i2c(i2c, &lm4857_regmap_config);
 124         if (IS_ERR(regmap))
 125                 return PTR_ERR(regmap);
 126 
 127         return devm_snd_soc_register_component(&i2c->dev,
 128                 &lm4857_component_driver, NULL, 0);
 129 }
 130 
 131 static const struct i2c_device_id lm4857_i2c_id[] = {
 132         { "lm4857", 0 },
 133         { }
 134 };
 135 MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
 136 
 137 static struct i2c_driver lm4857_i2c_driver = {
 138         .driver = {
 139                 .name = "lm4857",
 140         },
 141         .probe = lm4857_i2c_probe,
 142         .id_table = lm4857_i2c_id,
 143 };
 144 
 145 module_i2c_driver(lm4857_i2c_driver);
 146 
 147 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 148 MODULE_DESCRIPTION("LM4857 amplifier driver");
 149 MODULE_LICENSE("GPL");