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_soc_kcontrol_codec(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_soc_kcontrol_codec(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 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_codec *codec)
 134 {
 135         struct max9768 *max9768 = snd_soc_codec_get_drvdata(codec);
 136         int ret;
 137
 138         if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) {
 139                 ret = snd_soc_write(codec, MAX9768_CTRL, MAX9768_CTRL_PWM);
 140                 if (ret)
 141                         return ret;
 142         }
 143
 144         if (gpio_is_valid(max9768->mute_gpio)) {
 145                 ret = snd_soc_add_codec_controls(codec, max9768_mute,
 146                                 ARRAY_SIZE(max9768_mute));
 147                 if (ret)
 148                         return ret;
 149         }
 150
 151         return 0;
 152 }
 153
 154 static struct snd_soc_codec_driver max9768_codec_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 = gpio_request_one(pdata->mute_gpio, GPIOF_INIT_HIGH, "MAX9768 Mute");
 187                 max9768->mute_gpio = err ?: pdata->mute_gpio;
 188
 189                 /* Activate chip by releasing shutdown, enables I2C */
 190                 err = gpio_request_one(pdata->shdn_gpio, GPIOF_INIT_HIGH, "MAX9768 Shutdown");
 191                 max9768->shdn_gpio = err ?: pdata->shdn_gpio;
 192
 193                 max9768->flags = pdata->flags;
 194         } else {
 195                 max9768->shdn_gpio = -EINVAL;
 196                 max9768->mute_gpio = -EINVAL;
 197         }
 198
 199         i2c_set_clientdata(client, max9768);
 200
 201         max9768->regmap = devm_regmap_init_i2c(client, &max9768_i2c_regmap_config);
 202         if (IS_ERR(max9768->regmap)) {
 203                 err = PTR_ERR(max9768->regmap);
 204                 goto err_gpio_free;
 205         }
 206
 207         err = snd_soc_register_codec(&client->dev, &max9768_codec_driver, NULL, 0);
 208         if (err)
 209                 goto err_gpio_free;
 210
 211         return 0;
 212
 213  err_gpio_free:
 214         if (gpio_is_valid(max9768->shdn_gpio))
 215                 gpio_free(max9768->shdn_gpio);
 216         if (gpio_is_valid(max9768->mute_gpio))
 217                 gpio_free(max9768->mute_gpio);
 218
 219         return err;
 220 }
 221
 222 static int max9768_i2c_remove(struct i2c_client *client)
 223 {
 224         struct max9768 *max9768 = i2c_get_clientdata(client);
 225
 226         snd_soc_unregister_codec(&client->dev);
 227
 228         if (gpio_is_valid(max9768->shdn_gpio))
 229                 gpio_free(max9768->shdn_gpio);
 230         if (gpio_is_valid(max9768->mute_gpio))
 231                 gpio_free(max9768->mute_gpio);
 232
 233         return 0;
 234 }
 235
 236 static const struct i2c_device_id max9768_i2c_id[] = {
 237         { "max9768", 0 },
 238         { }
 239 };
 240 MODULE_DEVICE_TABLE(i2c, max9768_i2c_id);
 241
 242 static struct i2c_driver max9768_i2c_driver = {
 243         .driver = {
 244                 .name = "max9768",
 245                 .owner = THIS_MODULE,
 246         },
 247         .probe = max9768_i2c_probe,
 248         .remove = max9768_i2c_remove,
 249         .id_table = max9768_i2c_id,
 250 };
 251 module_i2c_driver(max9768_i2c_driver);
 252
 253 MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>");
 254 MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver");
 255 MODULE_LICENSE("GPL v2");