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
28 struct max9768 {
29 struct regmap *regmap;
30 struct gpio_desc *mute;
31 struct gpio_desc *shdn;
32 u32 flags;
33 };
34
35 static const struct reg_default max9768_default_regs[] = {
36 { 0, 0 },
37 { 3, MAX9768_CTRL_FILTERLESS},
38 };
39
max9768_get_gpio(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)40 static 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
max9768_set_gpio(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)52 static 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 bool val = !ucontrol->value.integer.value[0];
58 int ret;
59
60 if (val != gpiod_get_value_cansleep(max9768->mute))
61 ret = 1;
62 else
63 ret = 0;
64
65 gpiod_set_value_cansleep(max9768->mute, val);
66
67 return ret;
68 }
69
70 static const DECLARE_TLV_DB_RANGE(volume_tlv,
71 0, 0, TLV_DB_SCALE_ITEM(-16150, 0, 0),
72 1, 1, TLV_DB_SCALE_ITEM(-9280, 0, 0),
73 2, 2, TLV_DB_SCALE_ITEM(-9030, 0, 0),
74 3, 3, TLV_DB_SCALE_ITEM(-8680, 0, 0),
75 4, 4, TLV_DB_SCALE_ITEM(-8430, 0, 0),
76 5, 5, TLV_DB_SCALE_ITEM(-8080, 0, 0),
77 6, 6, TLV_DB_SCALE_ITEM(-7830, 0, 0),
78 7, 7, TLV_DB_SCALE_ITEM(-7470, 0, 0),
79 8, 8, TLV_DB_SCALE_ITEM(-7220, 0, 0),
80 9, 9, TLV_DB_SCALE_ITEM(-6870, 0, 0),
81 10, 10, TLV_DB_SCALE_ITEM(-6620, 0, 0),
82 11, 11, TLV_DB_SCALE_ITEM(-6270, 0, 0),
83 12, 12, TLV_DB_SCALE_ITEM(-6020, 0, 0),
84 13, 13, TLV_DB_SCALE_ITEM(-5670, 0, 0),
85 14, 14, TLV_DB_SCALE_ITEM(-5420, 0, 0),
86 15, 17, TLV_DB_SCALE_ITEM(-5060, 250, 0),
87 18, 18, TLV_DB_SCALE_ITEM(-4370, 0, 0),
88 19, 19, TLV_DB_SCALE_ITEM(-4210, 0, 0),
89 20, 20, TLV_DB_SCALE_ITEM(-3960, 0, 0),
90 21, 21, TLV_DB_SCALE_ITEM(-3760, 0, 0),
91 22, 22, TLV_DB_SCALE_ITEM(-3600, 0, 0),
92 23, 23, TLV_DB_SCALE_ITEM(-3340, 0, 0),
93 24, 24, TLV_DB_SCALE_ITEM(-3150, 0, 0),
94 25, 25, TLV_DB_SCALE_ITEM(-2980, 0, 0),
95 26, 26, TLV_DB_SCALE_ITEM(-2720, 0, 0),
96 27, 27, TLV_DB_SCALE_ITEM(-2520, 0, 0),
97 28, 30, TLV_DB_SCALE_ITEM(-2350, 190, 0),
98 31, 31, TLV_DB_SCALE_ITEM(-1750, 0, 0),
99 32, 34, TLV_DB_SCALE_ITEM(-1640, 100, 0),
100 35, 37, TLV_DB_SCALE_ITEM(-1310, 110, 0),
101 38, 39, TLV_DB_SCALE_ITEM(-990, 100, 0),
102 40, 40, TLV_DB_SCALE_ITEM(-710, 0, 0),
103 41, 41, TLV_DB_SCALE_ITEM(-600, 0, 0),
104 42, 42, TLV_DB_SCALE_ITEM(-500, 0, 0),
105 43, 43, TLV_DB_SCALE_ITEM(-340, 0, 0),
106 44, 44, TLV_DB_SCALE_ITEM(-190, 0, 0),
107 45, 45, TLV_DB_SCALE_ITEM(-50, 0, 0),
108 46, 46, TLV_DB_SCALE_ITEM(50, 0, 0),
109 47, 50, TLV_DB_SCALE_ITEM(120, 40, 0),
110 51, 57, TLV_DB_SCALE_ITEM(290, 50, 0),
111 58, 58, TLV_DB_SCALE_ITEM(650, 0, 0),
112 59, 62, TLV_DB_SCALE_ITEM(700, 60, 0),
113 63, 63, TLV_DB_SCALE_ITEM(950, 0, 0)
114 );
115
116 static const struct snd_kcontrol_new max9768_volume[] = {
117 SOC_SINGLE_TLV("Playback Volume", MAX9768_VOL, 0, 63, 0, volume_tlv),
118 };
119
120 static const struct snd_kcontrol_new max9768_mute[] = {
121 SOC_SINGLE_BOOL_EXT("Playback Switch", 0, max9768_get_gpio, max9768_set_gpio),
122 };
123
124 static const struct snd_soc_dapm_widget max9768_dapm_widgets[] = {
125 SND_SOC_DAPM_INPUT("IN"),
126
127 SND_SOC_DAPM_OUTPUT("OUT+"),
128 SND_SOC_DAPM_OUTPUT("OUT-"),
129 };
130
131 static const struct snd_soc_dapm_route max9768_dapm_routes[] = {
132 { "OUT+", NULL, "IN" },
133 { "OUT-", NULL, "IN" },
134 };
135
max9768_probe(struct snd_soc_component * component)136 static int max9768_probe(struct snd_soc_component *component)
137 {
138 struct max9768 *max9768 = snd_soc_component_get_drvdata(component);
139 int ret;
140
141 if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) {
142 ret = regmap_write(max9768->regmap, MAX9768_CTRL,
143 MAX9768_CTRL_PWM);
144 if (ret)
145 return ret;
146 }
147
148 if (max9768->mute) {
149 ret = snd_soc_add_component_controls(component, max9768_mute,
150 ARRAY_SIZE(max9768_mute));
151 if (ret)
152 return ret;
153 }
154
155 return 0;
156 }
157
158 static const struct snd_soc_component_driver max9768_component_driver = {
159 .probe = max9768_probe,
160 .controls = max9768_volume,
161 .num_controls = ARRAY_SIZE(max9768_volume),
162 .dapm_widgets = max9768_dapm_widgets,
163 .num_dapm_widgets = ARRAY_SIZE(max9768_dapm_widgets),
164 .dapm_routes = max9768_dapm_routes,
165 .num_dapm_routes = ARRAY_SIZE(max9768_dapm_routes),
166 };
167
168 static const struct regmap_config max9768_i2c_regmap_config = {
169 .reg_bits = 2,
170 .val_bits = 6,
171 .max_register = 3,
172 .reg_defaults = max9768_default_regs,
173 .num_reg_defaults = ARRAY_SIZE(max9768_default_regs),
174 .cache_type = REGCACHE_RBTREE,
175 };
176
max9768_i2c_probe(struct i2c_client * client)177 static int max9768_i2c_probe(struct i2c_client *client)
178 {
179 struct max9768 *max9768;
180 struct max9768_pdata *pdata = client->dev.platform_data;
181
182 max9768 = devm_kzalloc(&client->dev, sizeof(*max9768), GFP_KERNEL);
183 if (!max9768)
184 return -ENOMEM;
185
186 /* Mute on powerup to avoid clicks */
187 max9768->mute = devm_gpiod_get_optional(&client->dev,
188 "mute",
189 GPIOD_OUT_HIGH);
190 if (IS_ERR(max9768->mute))
191 return PTR_ERR(max9768->mute);
192 gpiod_set_consumer_name(max9768->mute, "MAX9768 Mute");
193
194 /* Activate chip by releasing shutdown, enables I2C */
195 max9768->shdn = devm_gpiod_get_optional(&client->dev,
196 "shutdown",
197 GPIOD_OUT_HIGH);
198 if (IS_ERR(max9768->shdn))
199 return PTR_ERR(max9768->shdn);
200 gpiod_set_consumer_name(max9768->shdn, "MAX9768 Shutdown");
201
202 if (pdata)
203 max9768->flags = pdata->flags;
204
205 i2c_set_clientdata(client, max9768);
206
207 max9768->regmap = devm_regmap_init_i2c(client, &max9768_i2c_regmap_config);
208 if (IS_ERR(max9768->regmap))
209 return PTR_ERR(max9768->regmap);
210
211 return devm_snd_soc_register_component(&client->dev,
212 &max9768_component_driver, NULL, 0);
213 }
214
215 static const struct i2c_device_id max9768_i2c_id[] = {
216 { "max9768" },
217 { }
218 };
219 MODULE_DEVICE_TABLE(i2c, max9768_i2c_id);
220
221 static struct i2c_driver max9768_i2c_driver = {
222 .driver = {
223 .name = "max9768",
224 },
225 .probe = max9768_i2c_probe,
226 .id_table = max9768_i2c_id,
227 };
228 module_i2c_driver(max9768_i2c_driver);
229
230 MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");
231 MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver");
232 MODULE_LICENSE("GPL v2");
233