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 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[] = {
 118         SOC_SINGLE_BOOL_EXT("Playback Switch", 0, max9768_get_gpio, max9768_set_gpio),
 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)) {
 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
 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
 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");