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
26struct lm4857 {
27	struct regmap *regmap;
28	uint8_t mode;
29};
30
31static 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
49static 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
60static 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
75static 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
97static const char *lm4857_mode[] = {
98	"Earpiece",
99	"Loudspeaker",
100	"Loudspeaker + Headphone",
101	"Headphone",
102};
103
104static SOC_ENUM_SINGLE_EXT_DECL(lm4857_mode_enum, lm4857_mode);
105
106static 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
114static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
115static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
116
117static 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. */
139static const struct snd_soc_dapm_route lm4857_routes[] = {
140	{"LS", NULL, "IN"},
141	{"HP", NULL, "IN"},
142	{"EP", NULL, "IN"},
143};
144
145static 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
156static 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
167static 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
185static int lm4857_i2c_remove(struct i2c_client *i2c)
186{
187	snd_soc_unregister_codec(&i2c->dev);
188	return 0;
189}
190
191static const struct i2c_device_id lm4857_i2c_id[] = {
192	{ "lm4857", 0 },
193	{ }
194};
195MODULE_DEVICE_TABLE(i2c, lm4857_i2c_id);
196
197static 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
207module_i2c_driver(lm4857_i2c_driver);
208
209MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
210MODULE_DESCRIPTION("LM4857 amplifier driver");
211MODULE_LICENSE("GPL");
212