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 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
 121 static const struct snd_soc_dapm_widget max9768_dapm_widgets[] = {
 122 SND_SOC_DAPM_INPUT("IN"),
 123
 124 SND_SOC_DAPM_OUTPUT("OUT+"),
 125 SND_SOC_DAPM_OUTPUT("OUT-"),
 126 };
 127
 128 static const struct snd_soc_dapm_route max9768_dapm_routes[] = {
 129         { "OUT+", NULL, "IN" },
 130         { "OUT-", NULL, "IN" },
 131 };
 132
 133 static int max9768_probe(struct snd_soc_component *component)
 134 {
 135         struct max9768 *max9768 = snd_soc_component_get_drvdata(component);
 136         int ret;
 137
 138         if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) {
 139                 ret = regmap_write(max9768->regmap, MAX9768_CTRL,
 140                         MAX9768_CTRL_PWM);
 141                 if (ret)
 142                         return ret;
 143         }
 144
 145         if (gpio_is_valid(max9768->mute_gpio)) {
 146                 ret = snd_soc_add_component_controls(component, max9768_mute,
 147                                 ARRAY_SIZE(max9768_mute));
 148                 if (ret)
 149                         return ret;
 150         }
 151
 152         return 0;
 153 }
 154
 155 static struct snd_soc_component_driver max9768_component_driver = {
 156         .probe = max9768_probe,
 157         .controls = max9768_volume,
 158         .num_controls = ARRAY_SIZE(max9768_volume),
 159         .dapm_widgets = max9768_dapm_widgets,
 160         .num_dapm_widgets = ARRAY_SIZE(max9768_dapm_widgets),
 161         .dapm_routes = max9768_dapm_routes,
 162         .num_dapm_routes = ARRAY_SIZE(max9768_dapm_routes),
 163 };
 164
 165 static const struct regmap_config max9768_i2c_regmap_config = {
 166         .reg_bits = 2,
 167         .val_bits = 6,
 168         .max_register = 3,
 169         .reg_defaults = max9768_default_regs,
 170         .num_reg_defaults = ARRAY_SIZE(max9768_default_regs),
 171         .cache_type = REGCACHE_RBTREE,
 172 };
 173
 174 static int max9768_i2c_probe(struct i2c_client *client,
 175                              const struct i2c_device_id *id)
 176 {
 177         struct max9768 *max9768;
 178         struct max9768_pdata *pdata = client->dev.platform_data;
 179         int err;
 180
 181         max9768 = devm_kzalloc(&client->dev, sizeof(*max9768), GFP_KERNEL);
 182         if (!max9768)
 183                 return -ENOMEM;
 184
 185         if (pdata) {
 186                 /* Mute on powerup to avoid clicks */
 187                 err = devm_gpio_request_one(&client->dev, pdata->mute_gpio,
 188                                 GPIOF_INIT_HIGH, "MAX9768 Mute");
 189                 max9768->mute_gpio = err ?: pdata->mute_gpio;
 190
 191                 /* Activate chip by releasing shutdown, enables I2C */
 192                 err = devm_gpio_request_one(&client->dev, pdata->shdn_gpio,
 193                                 GPIOF_INIT_HIGH, "MAX9768 Shutdown");
 194                 max9768->shdn_gpio = err ?: pdata->shdn_gpio;
 195
 196                 max9768->flags = pdata->flags;
 197         } else {
 198                 max9768->shdn_gpio = -EINVAL;
 199                 max9768->mute_gpio = -EINVAL;
 200         }
 201
 202         i2c_set_clientdata(client, max9768);
 203
 204         max9768->regmap = devm_regmap_init_i2c(client, &max9768_i2c_regmap_config);
 205         if (IS_ERR(max9768->regmap))
 206                 return PTR_ERR(max9768->regmap);
 207
 208         return devm_snd_soc_register_component(&client->dev,
 209                 &max9768_component_driver, NULL, 0);
 210 }
 211
 212 static const struct i2c_device_id max9768_i2c_id[] = {
 213         { "max9768", 0 },
 214         { }
 215 };
 216 MODULE_DEVICE_TABLE(i2c, max9768_i2c_id);
 217
 218 static struct i2c_driver max9768_i2c_driver = {
 219         .driver = {
 220                 .name = "max9768",
 221         },
 222         .probe = max9768_i2c_probe,
 223         .id_table = max9768_i2c_id,
 224 };
 225 module_i2c_driver(max9768_i2c_driver);
 226
 227 MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
 228 MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver");
 229 MODULE_LICENSE("GPL v2");