1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MAX9768 AMP driver
4 *
5 * Copyright (C) 2011, 2012 by Wolfram Sang, Pengutronix e.K.
6 */
7
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/i2c.h>
11#include <linux/slab.h>
12#include <linux/gpio/consumer.h>
13#include <linux/regmap.h>
14
15#include <sound/core.h>
16#include <sound/soc.h>
17#include <sound/tlv.h>
18#include <sound/max9768.h>
19
20/* "Registers" */
21#define MAX9768_VOL 0
22#define MAX9768_CTRL 3
23
24/* Commands */
25#define MAX9768_CTRL_PWM 0x15
26#define MAX9768_CTRL_FILTERLESS 0x16
27
28struct max9768 {
29	struct regmap *regmap;
30	struct gpio_desc *mute;
31	struct gpio_desc *shdn;
32	u32 flags;
33};
34
35static const struct reg_default max9768_default_regs[] = {
36	{ 0, 0 },
37	{ 3,  MAX9768_CTRL_FILTERLESS},
38};
39
40static int max9768_get_gpio(struct snd_kcontrol *kcontrol,
41	struct snd_ctl_elem_value *ucontrol)
42{
43	struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
44	struct max9768 *max9768 = snd_soc_component_get_drvdata(c);
45	int val = gpiod_get_value_cansleep(max9768->mute);
46
47	ucontrol->value.integer.value[0] = !val;
48
49	return 0;
50}
51
52static int max9768_set_gpio(struct snd_kcontrol *kcontrol,
53	struct snd_ctl_elem_value *ucontrol)
54{
55	struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
56	struct max9768 *max9768 = snd_soc_component_get_drvdata(c);
57
58	gpiod_set_value_cansleep(max9768->mute, !ucontrol->value.integer.value[0]);
59
60	return 0;
61}
62
63static const DECLARE_TLV_DB_RANGE(volume_tlv,
64	0, 0, TLV_DB_SCALE_ITEM(-16150, 0, 0),
65	1, 1, TLV_DB_SCALE_ITEM(-9280, 0, 0),
66	2, 2, TLV_DB_SCALE_ITEM(-9030, 0, 0),
67	3, 3, TLV_DB_SCALE_ITEM(-8680, 0, 0),
68	4, 4, TLV_DB_SCALE_ITEM(-8430, 0, 0),
69	5, 5, TLV_DB_SCALE_ITEM(-8080, 0, 0),
70	6, 6, TLV_DB_SCALE_ITEM(-7830, 0, 0),
71	7, 7, TLV_DB_SCALE_ITEM(-7470, 0, 0),
72	8, 8, TLV_DB_SCALE_ITEM(-7220, 0, 0),
73	9, 9, TLV_DB_SCALE_ITEM(-6870, 0, 0),
74	10, 10, TLV_DB_SCALE_ITEM(-6620, 0, 0),
75	11, 11, TLV_DB_SCALE_ITEM(-6270, 0, 0),
76	12, 12, TLV_DB_SCALE_ITEM(-6020, 0, 0),
77	13, 13, TLV_DB_SCALE_ITEM(-5670, 0, 0),
78	14, 14, TLV_DB_SCALE_ITEM(-5420, 0, 0),
79	15, 17, TLV_DB_SCALE_ITEM(-5060, 250, 0),
80	18, 18, TLV_DB_SCALE_ITEM(-4370, 0, 0),
81	19, 19, TLV_DB_SCALE_ITEM(-4210, 0, 0),
82	20, 20, TLV_DB_SCALE_ITEM(-3960, 0, 0),
83	21, 21, TLV_DB_SCALE_ITEM(-3760, 0, 0),
84	22, 22, TLV_DB_SCALE_ITEM(-3600, 0, 0),
85	23, 23, TLV_DB_SCALE_ITEM(-3340, 0, 0),
86	24, 24, TLV_DB_SCALE_ITEM(-3150, 0, 0),
87	25, 25, TLV_DB_SCALE_ITEM(-2980, 0, 0),
88	26, 26, TLV_DB_SCALE_ITEM(-2720, 0, 0),
89	27, 27, TLV_DB_SCALE_ITEM(-2520, 0, 0),
90	28, 30, TLV_DB_SCALE_ITEM(-2350, 190, 0),
91	31, 31, TLV_DB_SCALE_ITEM(-1750, 0, 0),
92	32, 34, TLV_DB_SCALE_ITEM(-1640, 100, 0),
93	35, 37, TLV_DB_SCALE_ITEM(-1310, 110, 0),
94	38, 39, TLV_DB_SCALE_ITEM(-990, 100, 0),
95	40, 40, TLV_DB_SCALE_ITEM(-710, 0, 0),
96	41, 41, TLV_DB_SCALE_ITEM(-600, 0, 0),
97	42, 42, TLV_DB_SCALE_ITEM(-500, 0, 0),
98	43, 43, TLV_DB_SCALE_ITEM(-340, 0, 0),
99	44, 44, TLV_DB_SCALE_ITEM(-190, 0, 0),
100	45, 45, TLV_DB_SCALE_ITEM(-50, 0, 0),
101	46, 46, TLV_DB_SCALE_ITEM(50, 0, 0),
102	47, 50, TLV_DB_SCALE_ITEM(120, 40, 0),
103	51, 57, TLV_DB_SCALE_ITEM(290, 50, 0),
104	58, 58, TLV_DB_SCALE_ITEM(650, 0, 0),
105	59, 62, TLV_DB_SCALE_ITEM(700, 60, 0),
106	63, 63, TLV_DB_SCALE_ITEM(950, 0, 0)
107);
108
109static const struct snd_kcontrol_new max9768_volume[] = {
110	SOC_SINGLE_TLV("Playback Volume", MAX9768_VOL, 0, 63, 0, volume_tlv),
111};
112
113static const struct snd_kcontrol_new max9768_mute[] = {
114	SOC_SINGLE_BOOL_EXT("Playback Switch", 0, max9768_get_gpio, max9768_set_gpio),
115};
116
117static const struct snd_soc_dapm_widget max9768_dapm_widgets[] = {
118SND_SOC_DAPM_INPUT("IN"),
119
120SND_SOC_DAPM_OUTPUT("OUT+"),
121SND_SOC_DAPM_OUTPUT("OUT-"),
122};
123
124static const struct snd_soc_dapm_route max9768_dapm_routes[] = {
125	{ "OUT+", NULL, "IN" },
126	{ "OUT-", NULL, "IN" },
127};
128
129static int max9768_probe(struct snd_soc_component *component)
130{
131	struct max9768 *max9768 = snd_soc_component_get_drvdata(component);
132	int ret;
133
134	if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) {
135		ret = regmap_write(max9768->regmap, MAX9768_CTRL,
136			MAX9768_CTRL_PWM);
137		if (ret)
138			return ret;
139	}
140
141	if (max9768->mute) {
142		ret = snd_soc_add_component_controls(component, max9768_mute,
143				ARRAY_SIZE(max9768_mute));
144		if (ret)
145			return ret;
146	}
147
148	return 0;
149}
150
151static const struct snd_soc_component_driver max9768_component_driver = {
152	.probe = max9768_probe,
153	.controls = max9768_volume,
154	.num_controls = ARRAY_SIZE(max9768_volume),
155	.dapm_widgets = max9768_dapm_widgets,
156	.num_dapm_widgets = ARRAY_SIZE(max9768_dapm_widgets),
157	.dapm_routes = max9768_dapm_routes,
158	.num_dapm_routes = ARRAY_SIZE(max9768_dapm_routes),
159};
160
161static const struct regmap_config max9768_i2c_regmap_config = {
162	.reg_bits = 2,
163	.val_bits = 6,
164	.max_register = 3,
165	.reg_defaults = max9768_default_regs,
166	.num_reg_defaults = ARRAY_SIZE(max9768_default_regs),
167	.cache_type = REGCACHE_RBTREE,
168};
169
170static int max9768_i2c_probe(struct i2c_client *client)
171{
172	struct max9768 *max9768;
173	struct max9768_pdata *pdata = client->dev.platform_data;
174
175	max9768 = devm_kzalloc(&client->dev, sizeof(*max9768), GFP_KERNEL);
176	if (!max9768)
177		return -ENOMEM;
178
179	/* Mute on powerup to avoid clicks */
180	max9768->mute = devm_gpiod_get_optional(&client->dev,
181						"mute",
182						GPIOD_OUT_HIGH);
183	if (IS_ERR(max9768->mute))
184		return PTR_ERR(max9768->mute);
185	gpiod_set_consumer_name(max9768->mute, "MAX9768 Mute");
186
187	/* Activate chip by releasing shutdown, enables I2C */
188	max9768->shdn = devm_gpiod_get_optional(&client->dev,
189						"shutdown",
190						GPIOD_OUT_HIGH);
191	if (IS_ERR(max9768->shdn))
192		return PTR_ERR(max9768->shdn);
193	gpiod_set_consumer_name(max9768->shdn, "MAX9768 Shutdown");
194
195	if (pdata)
196		max9768->flags = pdata->flags;
197
198	i2c_set_clientdata(client, max9768);
199
200	max9768->regmap = devm_regmap_init_i2c(client, &max9768_i2c_regmap_config);
201	if (IS_ERR(max9768->regmap))
202		return PTR_ERR(max9768->regmap);
203
204	return devm_snd_soc_register_component(&client->dev,
205		&max9768_component_driver, NULL, 0);
206}
207
208static const struct i2c_device_id max9768_i2c_id[] = {
209	{ "max9768", 0 },
210	{ }
211};
212MODULE_DEVICE_TABLE(i2c, max9768_i2c_id);
213
214static struct i2c_driver max9768_i2c_driver = {
215	.driver = {
216		.name = "max9768",
217	},
218	.probe = max9768_i2c_probe,
219	.id_table = max9768_i2c_id,
220};
221module_i2c_driver(max9768_i2c_driver);
222
223MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");
224MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver");
225MODULE_LICENSE("GPL v2");
226