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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  
lm4857_i2c_probe(struct i2c_client * i2c)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