xref: /openbmc/linux/sound/soc/codecs/lm4857.c (revision 5b4fc395)
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", 0 },
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_new = 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