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"); 245