1 /*
2 * MAX9768 AMP driver
3 *
4 * Copyright (C) 2011, 2012 by Wolfram Sang, Pengutronix e.K.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; version 2 of the License.
9 */
10
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/i2c.h>
14 #include <linux/slab.h>
15 #include <linux/gpio.h>
16 #include <linux/regmap.h>
17
18 #include <sound/core.h>
19 #include <sound/soc.h>
20 #include <sound/tlv.h>
21 #include <sound/max9768.h>
22
23 /* "Registers" */
24 #define MAX9768_VOL 0
25 #define MAX9768_CTRL 3
26
27 /* Commands */
28 #define MAX9768_CTRL_PWM 0x15
29 #define MAX9768_CTRL_FILTERLESS 0x16
30
31 struct max9768 {
32 struct regmap *regmap;
33 int mute_gpio;
34 int shdn_gpio;
35 u32 flags;
36 };
37
38 static struct reg_default max9768_default_regs[] = {
39 { 0, 0 },
40 { 3, MAX9768_CTRL_FILTERLESS},
41 };
42
max9768_get_gpio(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)43 static int max9768_get_gpio(struct snd_kcontrol *kcontrol,
44 struct snd_ctl_elem_value *ucontrol)
45 {
46 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
47 struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
48 int val = gpio_get_value_cansleep(max9768->mute_gpio);
49
50 ucontrol->value.integer.value[0] = !val;
51
52 return 0;
53 }
54
max9768_set_gpio(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)55 static int max9768_set_gpio(struct snd_kcontrol *kcontrol,
56 struct snd_ctl_elem_value *ucontrol)
57 {
58 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
59 struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
60
61 gpio_set_value_cansleep(max9768->mute_gpio, !ucontrol->value.integer.value[0]);
62
63 return 0;
64 }
65
66 static const unsigned int volume_tlv[] = {
67 TLV_DB_RANGE_HEAD(43),
68 0, 0, TLV_DB_SCALE_ITEM(-16150, 0, 0),
69 1, 1, TLV_DB_SCALE_ITEM(-9280, 0, 0),
70 2, 2, TLV_DB_SCALE_ITEM(-9030, 0, 0),
71 3, 3, TLV_DB_SCALE_ITEM(-8680, 0, 0),
72 4, 4, TLV_DB_SCALE_ITEM(-8430, 0, 0),
73 5, 5, TLV_DB_SCALE_ITEM(-8080, 0, 0),
74 6, 6, TLV_DB_SCALE_ITEM(-7830, 0, 0),
75 7, 7, TLV_DB_SCALE_ITEM(-7470, 0, 0),
76 8, 8, TLV_DB_SCALE_ITEM(-7220, 0, 0),
77 9, 9, TLV_DB_SCALE_ITEM(-6870, 0, 0),
78 10, 10, TLV_DB_SCALE_ITEM(-6620, 0, 0),
79 11, 11, TLV_DB_SCALE_ITEM(-6270, 0, 0),
80 12, 12, TLV_DB_SCALE_ITEM(-6020, 0, 0),
81 13, 13, TLV_DB_SCALE_ITEM(-5670, 0, 0),
82 14, 14, TLV_DB_SCALE_ITEM(-5420, 0, 0),
83 15, 17, TLV_DB_SCALE_ITEM(-5060, 250, 0),
84 18, 18, TLV_DB_SCALE_ITEM(-4370, 0, 0),
85 19, 19, TLV_DB_SCALE_ITEM(-4210, 0, 0),
86 20, 20, TLV_DB_SCALE_ITEM(-3960, 0, 0),
87 21, 21, TLV_DB_SCALE_ITEM(-3760, 0, 0),
88 22, 22, TLV_DB_SCALE_ITEM(-3600, 0, 0),
89 23, 23, TLV_DB_SCALE_ITEM(-3340, 0, 0),
90 24, 24, TLV_DB_SCALE_ITEM(-3150, 0, 0),
91 25, 25, TLV_DB_SCALE_ITEM(-2980, 0, 0),
92 26, 26, TLV_DB_SCALE_ITEM(-2720, 0, 0),
93 27, 27, TLV_DB_SCALE_ITEM(-2520, 0, 0),
94 28, 30, TLV_DB_SCALE_ITEM(-2350, 190, 0),
95 31, 31, TLV_DB_SCALE_ITEM(-1750, 0, 0),
96 32, 34, TLV_DB_SCALE_ITEM(-1640, 100, 0),
97 35, 37, TLV_DB_SCALE_ITEM(-1310, 110, 0),
98 38, 39, TLV_DB_SCALE_ITEM(-990, 100, 0),
99 40, 40, TLV_DB_SCALE_ITEM(-710, 0, 0),
100 41, 41, TLV_DB_SCALE_ITEM(-600, 0, 0),
101 42, 42, TLV_DB_SCALE_ITEM(-500, 0, 0),
102 43, 43, TLV_DB_SCALE_ITEM(-340, 0, 0),
103 44, 44, TLV_DB_SCALE_ITEM(-190, 0, 0),
104 45, 45, TLV_DB_SCALE_ITEM(-50, 0, 0),
105 46, 46, TLV_DB_SCALE_ITEM(50, 0, 0),
106 47, 50, TLV_DB_SCALE_ITEM(120, 40, 0),
107 51, 57, TLV_DB_SCALE_ITEM(290, 50, 0),
108 58, 58, TLV_DB_SCALE_ITEM(650, 0, 0),
109 59, 62, TLV_DB_SCALE_ITEM(700, 60, 0),
110 63, 63, TLV_DB_SCALE_ITEM(950, 0, 0),
111 };
112
113 static const struct snd_kcontrol_new max9768_volume[] = {
114 SOC_SINGLE_TLV("Playback Volume", MAX9768_VOL, 0, 63, 0, volume_tlv),
115 };
116
117 static const struct snd_kcontrol_new max9768_mute[] = {
118 SOC_SINGLE_BOOL_EXT("Playback Switch", 0, max9768_get_gpio, max9768_set_gpio),
119 };
120
max9768_probe(struct snd_soc_codec * codec)121 static int max9768_probe(struct snd_soc_codec *codec)
122 {
123 struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
124 int ret;
125
126 codec->control_data = max9768->regmap;
127 ret = snd_soc_codec_set_cache_io(codec, 2, 6, SND_SOC_REGMAP);
128 if (ret)
129 return ret;
130
131 if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) {
132 ret = snd_soc_write(codec, MAX9768_CTRL, MAX9768_CTRL_PWM);
133 if (ret)
134 return ret;
135 }
136
137 if (gpio_is_valid(max9768->mute_gpio)) {
138 ret = snd_soc_add_codec_controls(codec, max9768_mute,
139 ARRAY_SIZE(max9768_mute));
140 if (ret)
141 return ret;
142 }
143
144 return 0;
145 }
146
147 static struct snd_soc_codec_driver max9768_codec_driver = {
148 .probe = max9768_probe,
149 .controls = max9768_volume,
150 .num_controls = ARRAY_SIZE(max9768_volume),
151 };
152
153 static const struct regmap_config max9768_i2c_regmap_config = {
154 .reg_bits = 2,
155 .val_bits = 6,
156 .max_register = 3,
157 .reg_defaults = max9768_default_regs,
158 .num_reg_defaults = ARRAY_SIZE(max9768_default_regs),
159 .cache_type = REGCACHE_RBTREE,
160 };
161
max9768_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)162 static int max9768_i2c_probe(struct i2c_client *client,
163 const struct i2c_device_id *id)
164 {
165 struct max9768 *max9768;
166 struct max9768_pdata *pdata = client->dev.platform_data;
167 int err;
168
169 max9768 = devm_kzalloc(&client->dev, sizeof(*max9768), GFP_KERNEL);
170 if (!max9768)
171 return -ENOMEM;
172
173 if (pdata) {
174 /* Mute on powerup to avoid clicks */
175 err = gpio_request_one(pdata->mute_gpio, GPIOF_INIT_HIGH, "MAX9768 Mute");
176 max9768->mute_gpio = err ?: pdata->mute_gpio;
177
178 /* Activate chip by releasing shutdown, enables I2C */
179 err = gpio_request_one(pdata->shdn_gpio, GPIOF_INIT_HIGH, "MAX9768 Shutdown");
180 max9768->shdn_gpio = err ?: pdata->shdn_gpio;
181
182 max9768->flags = pdata->flags;
183 } else {
184 max9768->shdn_gpio = -EINVAL;
185 max9768->mute_gpio = -EINVAL;
186 }
187
188 i2c_set_clientdata(client, max9768);
189
190 max9768->regmap = devm_regmap_init_i2c(client, &max9768_i2c_regmap_config);
191 if (IS_ERR(max9768->regmap)) {
192 err = PTR_ERR(max9768->regmap);
193 goto err_gpio_free;
194 }
195
196 err = snd_soc_register_codec(&client->dev, &max9768_codec_driver, NULL, 0);
197 if (err)
198 goto err_gpio_free;
199
200 return 0;
201
202 err_gpio_free:
203 if (gpio_is_valid(max9768->shdn_gpio))
204 gpio_free(max9768->shdn_gpio);
205 if (gpio_is_valid(max9768->mute_gpio))
206 gpio_free(max9768->mute_gpio);
207
208 return err;
209 }
210
max9768_i2c_remove(struct i2c_client * client)211 static int max9768_i2c_remove(struct i2c_client *client)
212 {
213 struct max9768 *max9768 = i2c_get_clientdata(client);
214
215 snd_soc_unregister_codec(&client->dev);
216
217 if (gpio_is_valid(max9768->shdn_gpio))
218 gpio_free(max9768->shdn_gpio);
219 if (gpio_is_valid(max9768->mute_gpio))
220 gpio_free(max9768->mute_gpio);
221
222 return 0;
223 }
224
225 static const struct i2c_device_id max9768_i2c_id[] = {
226 { "max9768", 0 },
227 { }
228 };
229 MODULE_DEVICE_TABLE(i2c, max9768_i2c_id);
230
231 static struct i2c_driver max9768_i2c_driver = {
232 .driver = {
233 .name = "max9768",
234 .owner = THIS_MODULE,
235 },
236 .probe = max9768_i2c_probe,
237 .remove = max9768_i2c_remove,
238 .id_table = max9768_i2c_id,
239 };
240 module_i2c_driver(max9768_i2c_driver);
241
242 MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
243 MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver");
244 MODULE_LICENSE("GPL v2");
245