aboutsummaryrefslogtreecommitdiff
path: root/sound/soc/codecs/max9768.c
blob: 31f91560e9f6df0fb115ea862b712e9863cad9dd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
/*
 * MAX9768 AMP driver
 *
 * Copyright (C) 2011, 2012 by Wolfram Sang, Pengutronix e.K.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; version 2 of the License.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/regmap.h>

#include <sound/core.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include <sound/max9768.h>

/* "Registers" */
#define MAX9768_VOL 0
#define MAX9768_CTRL 3

/* Commands */
#define MAX9768_CTRL_PWM 0x15
#define MAX9768_CTRL_FILTERLESS 0x16

struct max9768 {
	struct regmap *regmap;
	int mute_gpio;
	int shdn_gpio;
	u32 flags;
};

static struct reg_default max9768_default_regs[] = {
	{ 0, 0 },
	{ 3,  MAX9768_CTRL_FILTERLESS},
};

static int max9768_get_gpio(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
	struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
	int val = gpio_get_value_cansleep(max9768->mute_gpio);

	ucontrol->value.integer.value[0] = !val;

	return 0;
}

static int max9768_set_gpio(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
	struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);

	gpio_set_value_cansleep(max9768->mute_gpio, !ucontrol->value.integer.value[0]);

	return 0;
}

static const unsigned int volume_tlv[] = {
	TLV_DB_RANGE_HEAD(43),
	0, 0, TLV_DB_SCALE_ITEM(-16150, 0, 0),
	1, 1, TLV_DB_SCALE_ITEM(-9280, 0, 0),
	2, 2, TLV_DB_SCALE_ITEM(-9030, 0, 0),
	3, 3, TLV_DB_SCALE_ITEM(-8680, 0, 0),
	4, 4, TLV_DB_SCALE_ITEM(-8430, 0, 0),
	5, 5, TLV_DB_SCALE_ITEM(-8080, 0, 0),
	6, 6, TLV_DB_SCALE_ITEM(-7830, 0, 0),
	7, 7, TLV_DB_SCALE_ITEM(-7470, 0, 0),
	8, 8, TLV_DB_SCALE_ITEM(-7220, 0, 0),
	9, 9, TLV_DB_SCALE_ITEM(-6870, 0, 0),
	10, 10, TLV_DB_SCALE_ITEM(-6620, 0, 0),
	11, 11, TLV_DB_SCALE_ITEM(-6270, 0, 0),
	12, 12, TLV_DB_SCALE_ITEM(-6020, 0, 0),
	13, 13, TLV_DB_SCALE_ITEM(-5670, 0, 0),
	14, 14, TLV_DB_SCALE_ITEM(-5420, 0, 0),
	15, 17, TLV_DB_SCALE_ITEM(-5060, 250, 0),
	18, 18, TLV_DB_SCALE_ITEM(-4370, 0, 0),
	19, 19, TLV_DB_SCALE_ITEM(-4210, 0, 0),
	20, 20, TLV_DB_SCALE_ITEM(-3960, 0, 0),
	21, 21, TLV_DB_SCALE_ITEM(-3760, 0, 0),
	22, 22, TLV_DB_SCALE_ITEM(-3600, 0, 0),
	23, 23, TLV_DB_SCALE_ITEM(-3340, 0, 0),
	24, 24, TLV_DB_SCALE_ITEM(-3150, 0, 0),
	25, 25, TLV_DB_SCALE_ITEM(-2980, 0, 0),
	26, 26, TLV_DB_SCALE_ITEM(-2720, 0, 0),
	27, 27, TLV_DB_SCALE_ITEM(-2520, 0, 0),
	28, 30, TLV_DB_SCALE_ITEM(-2350, 190, 0),
	31, 31, TLV_DB_SCALE_ITEM(-1750, 0, 0),
	32, 34, TLV_DB_SCALE_ITEM(-1640, 100, 0),
	35, 37, TLV_DB_SCALE_ITEM(-1310, 110, 0),
	38, 39, TLV_DB_SCALE_ITEM(-990, 100, 0),
	40, 40, TLV_DB_SCALE_ITEM(-710, 0, 0),
	41, 41, TLV_DB_SCALE_ITEM(-600, 0, 0),
	42, 42, TLV_DB_SCALE_ITEM(-500, 0, 0),
	43, 43, TLV_DB_SCALE_ITEM(-340, 0, 0),
	44, 44, TLV_DB_SCALE_ITEM(-190, 0, 0),
	45, 45, TLV_DB_SCALE_ITEM(-50, 0, 0),
	46, 46, TLV_DB_SCALE_ITEM(50, 0, 0),
	47, 50, TLV_DB_SCALE_ITEM(120, 40, 0),
	51, 57, TLV_DB_SCALE_ITEM(290, 50, 0),
	58, 58, TLV_DB_SCALE_ITEM(650, 0, 0),
	59, 62, TLV_DB_SCALE_ITEM(700, 60, 0),
	63, 63, TLV_DB_SCALE_ITEM(950, 0, 0),
};

static const struct snd_kcontrol_new max9768_volume[] = {
	SOC_SINGLE_TLV("Playback Volume", MAX9768_VOL, 0, 63, 0, volume_tlv),
};

static const struct snd_kcontrol_new max9768_mute[] = {
	SOC_SINGLE_BOOL_EXT("Playback Switch", 0, max9768_get_gpio, max9768_set_gpio),
};

static const struct snd_soc_dapm_widget max9768_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("IN"),

SND_SOC_DAPM_OUTPUT("OUT+"),
SND_SOC_DAPM_OUTPUT("OUT-"),
};

static const struct snd_soc_dapm_route max9768_dapm_routes[] = {
	{ "OUT+", NULL, "IN" },
	{ "OUT-", NULL, "IN" },
};

static int max9768_probe(struct snd_soc_codec *codec)
{
	struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
	int ret;

	codec->control_data = max9768->regmap;
	ret = snd_soc_codec_set_cache_io(codec, 2, 6, SND_SOC_REGMAP);
	if (ret)
		return ret;

	if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) {
		ret = snd_soc_write(codec, MAX9768_CTRL, MAX9768_CTRL_PWM);
		if (ret)
			return ret;
	}

	if (gpio_is_valid(max9768->mute_gpio)) {
		ret = snd_soc_add_codec_controls(codec, max9768_mute,
				ARRAY_SIZE(max9768_mute));
		if (ret)
			return ret;
	}

	return 0;
}

static struct snd_soc_codec_driver max9768_codec_driver = {
	.probe = max9768_probe,
	.controls = max9768_volume,
	.num_controls = ARRAY_SIZE(max9768_volume),
	.dapm_widgets = max9768_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(max9768_dapm_widgets),
	.dapm_routes = max9768_dapm_routes,
	.num_dapm_routes = ARRAY_SIZE(max9768_dapm_routes),
};

static const struct regmap_config max9768_i2c_regmap_config = {
	.reg_bits = 2,
	.val_bits = 6,
	.max_register = 3,
	.reg_defaults = max9768_default_regs,
	.num_reg_defaults = ARRAY_SIZE(max9768_default_regs),
	.cache_type = REGCACHE_RBTREE,
};

static int max9768_i2c_probe(struct i2c_client *client,
			     const struct i2c_device_id *id)
{
	struct max9768 *max9768;
	struct max9768_pdata *pdata = client->dev.platform_data;
	int err;

	max9768 = devm_kzalloc(&client->dev, sizeof(*max9768), GFP_KERNEL);
	if (!max9768)
		return -ENOMEM;

	if (pdata) {
		/* Mute on powerup to avoid clicks */
		err = gpio_request_one(pdata->mute_gpio, GPIOF_INIT_HIGH, "MAX9768 Mute");
		max9768->mute_gpio = err ?: pdata->mute_gpio;

		/* Activate chip by releasing shutdown, enables I2C */
		err = gpio_request_one(pdata->shdn_gpio, GPIOF_INIT_HIGH, "MAX9768 Shutdown");
		max9768->shdn_gpio = err ?: pdata->shdn_gpio;

		max9768->flags = pdata->flags;
	} else {
		max9768->shdn_gpio = -EINVAL;
		max9768->mute_gpio = -EINVAL;
	}

	i2c_set_clientdata(client, max9768);

	max9768->regmap = devm_regmap_init_i2c(client, &max9768_i2c_regmap_config);
	if (IS_ERR(max9768->regmap)) {
		err = PTR_ERR(max9768->regmap);
		goto err_gpio_free;
	}

	err = snd_soc_register_codec(&client->dev, &max9768_codec_driver, NULL, 0);
	if (err)
		goto err_gpio_free;

	return 0;

 err_gpio_free:
	if (gpio_is_valid(max9768->shdn_gpio))
		gpio_free(max9768->shdn_gpio);
	if (gpio_is_valid(max9768->mute_gpio))
		gpio_free(max9768->mute_gpio);

	return err;
}

static int max9768_i2c_remove(struct i2c_client *client)
{
	struct max9768 *max9768 = i2c_get_clientdata(client);

	snd_soc_unregister_codec(&client->dev);

	if (gpio_is_valid(max9768->shdn_gpio))
		gpio_free(max9768->shdn_gpio);
	if (gpio_is_valid(max9768->mute_gpio))
		gpio_free(max9768->mute_gpio);

	return 0;
}

static const struct i2c_device_id max9768_i2c_id[] = {
	{ "max9768", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max9768_i2c_id);

static struct i2c_driver max9768_i2c_driver = {
	.driver = {
		.name = "max9768",
		.owner = THIS_MODULE,
	},
	.probe = max9768_i2c_probe,
	.remove = max9768_i2c_remove,
	.id_table = max9768_i2c_id,
};
module_i2c_driver(max9768_i2c_driver);

MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver");
MODULE_LICENSE("GPL v2");