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 {
120 struct regmap *regmap;
121
122 regmap = devm_regmap_init_i2c(i2c, &lm4857_regmap_config);
123 if (IS_ERR(regmap))
124 return PTR_ERR(regmap);
125
126 return devm_snd_soc_register_component(&i2c->dev,
127 &lm4857_component_driver, NULL, 0);
128 }
129
130 static const struct i2c_device_id lm4857_i2c_id[] = {
131 { "lm4857" },
132 { }
133 };
134 MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
135
136 static struct i2c_driver lm4857_i2c_driver = {
137 .driver = {
138 .name = "lm4857",
139 },
140 .probe = lm4857_i2c_probe,
141 .id_table = lm4857_i2c_id,
142 };
143
144 module_i2c_driver(lm4857_i2c_driver);
145
146 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
147 MODULE_DESCRIPTION("LM4857 amplifier driver");
148 MODULE_LICENSE("GPL");
149
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