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 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 codec->control_data = max9768->regmap; 139 ret = snd_soc_codec_set_cache_io(codec, 2, 6, SND_SOC_REGMAP); 140 if (ret) 141 return ret; 142 143 if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) { 144 ret = snd_soc_write(codec, MAX9768_CTRL, MAX9768_CTRL_PWM); 145 if (ret) 146 return ret; 147 } 148 149 if (gpio_is_valid(max9768->mute_gpio)) { 150 ret = snd_soc_add_codec_controls(codec, max9768_mute, 151 ARRAY_SIZE(max9768_mute)); 152 if (ret) 153 return ret; 154 } 155 156 return 0; 157 } 158 159 static struct snd_soc_codec_driver max9768_codec_driver = { 160 .probe = max9768_probe, 161 .controls = max9768_volume, 162 .num_controls = ARRAY_SIZE(max9768_volume), 163 .dapm_widgets = max9768_dapm_widgets, 164 .num_dapm_widgets = ARRAY_SIZE(max9768_dapm_widgets), 165 .dapm_routes = max9768_dapm_routes, 166 .num_dapm_routes = ARRAY_SIZE(max9768_dapm_routes), 167 }; 168 169 static const struct regmap_config max9768_i2c_regmap_config = { 170 .reg_bits = 2, 171 .val_bits = 6, 172 .max_register = 3, 173 .reg_defaults = max9768_default_regs, 174 .num_reg_defaults = ARRAY_SIZE(max9768_default_regs), 175 .cache_type = REGCACHE_RBTREE, 176 }; 177 178 static int max9768_i2c_probe(struct i2c_client *client, 179 const struct i2c_device_id *id) 180 { 181 struct max9768 *max9768; 182 struct max9768_pdata *pdata = client->dev.platform_data; 183 int err; 184 185 max9768 = devm_kzalloc(&client->dev, sizeof(*max9768), GFP_KERNEL); 186 if (!max9768) 187 return -ENOMEM; 188 189 if (pdata) { 190 /* Mute on powerup to avoid clicks */ 191 err = gpio_request_one(pdata->mute_gpio, GPIOF_INIT_HIGH, "MAX9768 Mute"); 192 max9768->mute_gpio = err ?: pdata->mute_gpio; 193 194 /* Activate chip by releasing shutdown, enables I2C */ 195 err = gpio_request_one(pdata->shdn_gpio, GPIOF_INIT_HIGH, "MAX9768 Shutdown"); 196 max9768->shdn_gpio = err ?: pdata->shdn_gpio; 197 198 max9768->flags = pdata->flags; 199 } else { 200 max9768->shdn_gpio = -EINVAL; 201 max9768->mute_gpio = -EINVAL; 202 } 203 204 i2c_set_clientdata(client, max9768); 205 206 max9768->regmap = devm_regmap_init_i2c(client, &max9768_i2c_regmap_config); 207 if (IS_ERR(max9768->regmap)) { 208 err = PTR_ERR(max9768->regmap); 209 goto err_gpio_free; 210 } 211 212 err = snd_soc_register_codec(&client->dev, &max9768_codec_driver, NULL, 0); 213 if (err) 214 goto err_gpio_free; 215 216 return 0; 217 218 err_gpio_free: 219 if (gpio_is_valid(max9768->shdn_gpio)) 220 gpio_free(max9768->shdn_gpio); 221 if (gpio_is_valid(max9768->mute_gpio)) 222 gpio_free(max9768->mute_gpio); 223 224 return err; 225 } 226 227 static int max9768_i2c_remove(struct i2c_client *client) 228 { 229 struct max9768 *max9768 = i2c_get_clientdata(client); 230 231 snd_soc_unregister_codec(&client->dev); 232 233 if (gpio_is_valid(max9768->shdn_gpio)) 234 gpio_free(max9768->shdn_gpio); 235 if (gpio_is_valid(max9768->mute_gpio)) 236 gpio_free(max9768->mute_gpio); 237 238 return 0; 239 } 240 241 static const struct i2c_device_id max9768_i2c_id[] = { 242 { "max9768", 0 }, 243 { } 244 }; 245 MODULE_DEVICE_TABLE(i2c, max9768_i2c_id); 246 247 static struct i2c_driver max9768_i2c_driver = { 248 .driver = { 249 .name = "max9768", 250 .owner = THIS_MODULE, 251 }, 252 .probe = max9768_i2c_probe, 253 .remove = max9768_i2c_remove, 254 .id_table = max9768_i2c_id, 255 }; 256 module_i2c_driver(max9768_i2c_driver); 257 258 MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>"); 259 MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver"); 260 MODULE_LICENSE("GPL v2"); 261