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Linux/sound/soc/codecs/max9768.c

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

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