sound/soc/codecs/max9768.c

   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");