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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