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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 | ||
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 | ||
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[] = { | |
69edea8a | 118 | SOC_SINGLE_BOOL_EXT("Playback Switch", 0, max9768_get_gpio, max9768_set_gpio), |
394d2bba WS |
119 | }; |
120 | ||
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)) { | |
14ac9112 | 138 | ret = snd_soc_add_codec_controls(codec, max9768_mute, |
394d2bba WS |
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 | ||
394d2bba WS |
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), | |
394d2bba WS |
159 | .cache_type = REGCACHE_RBTREE, |
160 | }; | |
161 | ||
162 | static int __devinit 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 = 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_regmap_free; | |
199 | ||
200 | return 0; | |
201 | ||
202 | err_regmap_free: | |
203 | regmap_exit(max9768->regmap); | |
204 | err_gpio_free: | |
205 | if (gpio_is_valid(max9768->shdn_gpio)) | |
206 | gpio_free(max9768->shdn_gpio); | |
207 | if (gpio_is_valid(max9768->mute_gpio)) | |
208 | gpio_free(max9768->mute_gpio); | |
209 | ||
210 | return err; | |
211 | } | |
212 | ||
213 | static int __devexit max9768_i2c_remove(struct i2c_client *client) | |
214 | { | |
215 | struct max9768 *max9768 = i2c_get_clientdata(client); | |
216 | ||
217 | snd_soc_unregister_codec(&client->dev); | |
218 | regmap_exit(max9768->regmap); | |
219 | ||
220 | if (gpio_is_valid(max9768->shdn_gpio)) | |
221 | gpio_free(max9768->shdn_gpio); | |
222 | if (gpio_is_valid(max9768->mute_gpio)) | |
223 | gpio_free(max9768->mute_gpio); | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static const struct i2c_device_id max9768_i2c_id[] = { | |
229 | { "max9768", 0 }, | |
230 | { } | |
231 | }; | |
232 | MODULE_DEVICE_TABLE(i2c, max9768_i2c_id); | |
233 | ||
234 | static struct i2c_driver max9768_i2c_driver = { | |
235 | .driver = { | |
236 | .name = "max9768", | |
237 | .owner = THIS_MODULE, | |
238 | }, | |
239 | .probe = max9768_i2c_probe, | |
240 | .remove = __devexit_p(max9768_i2c_remove), | |
241 | .id_table = max9768_i2c_id, | |
242 | }; | |
243 | module_i2c_driver(max9768_i2c_driver); | |
244 | ||
245 | MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>"); | |
246 | MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver"); | |
247 | MODULE_LICENSE("GPL v2"); |