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 DECLARE_TLV_DB_RANGE(volume_tlv, 67 0, 0, TLV_DB_SCALE_ITEM(-16150, 0, 0), 68 1, 1, TLV_DB_SCALE_ITEM(-9280, 0, 0), 69 2, 2, TLV_DB_SCALE_ITEM(-9030, 0, 0), 70 3, 3, TLV_DB_SCALE_ITEM(-8680, 0, 0), 71 4, 4, TLV_DB_SCALE_ITEM(-8430, 0, 0), 72 5, 5, TLV_DB_SCALE_ITEM(-8080, 0, 0), 73 6, 6, TLV_DB_SCALE_ITEM(-7830, 0, 0), 74 7, 7, TLV_DB_SCALE_ITEM(-7470, 0, 0), 75 8, 8, TLV_DB_SCALE_ITEM(-7220, 0, 0), 76 9, 9, TLV_DB_SCALE_ITEM(-6870, 0, 0), 77 10, 10, TLV_DB_SCALE_ITEM(-6620, 0, 0), 78 11, 11, TLV_DB_SCALE_ITEM(-6270, 0, 0), 79 12, 12, TLV_DB_SCALE_ITEM(-6020, 0, 0), 80 13, 13, TLV_DB_SCALE_ITEM(-5670, 0, 0), 81 14, 14, TLV_DB_SCALE_ITEM(-5420, 0, 0), 82 15, 17, TLV_DB_SCALE_ITEM(-5060, 250, 0), 83 18, 18, TLV_DB_SCALE_ITEM(-4370, 0, 0), 84 19, 19, TLV_DB_SCALE_ITEM(-4210, 0, 0), 85 20, 20, TLV_DB_SCALE_ITEM(-3960, 0, 0), 86 21, 21, TLV_DB_SCALE_ITEM(-3760, 0, 0), 87 22, 22, TLV_DB_SCALE_ITEM(-3600, 0, 0), 88 23, 23, TLV_DB_SCALE_ITEM(-3340, 0, 0), 89 24, 24, TLV_DB_SCALE_ITEM(-3150, 0, 0), 90 25, 25, TLV_DB_SCALE_ITEM(-2980, 0, 0), 91 26, 26, TLV_DB_SCALE_ITEM(-2720, 0, 0), 92 27, 27, TLV_DB_SCALE_ITEM(-2520, 0, 0), 93 28, 30, TLV_DB_SCALE_ITEM(-2350, 190, 0), 94 31, 31, TLV_DB_SCALE_ITEM(-1750, 0, 0), 95 32, 34, TLV_DB_SCALE_ITEM(-1640, 100, 0), 96 35, 37, TLV_DB_SCALE_ITEM(-1310, 110, 0), 97 38, 39, TLV_DB_SCALE_ITEM(-990, 100, 0), 98 40, 40, TLV_DB_SCALE_ITEM(-710, 0, 0), 99 41, 41, TLV_DB_SCALE_ITEM(-600, 0, 0), 100 42, 42, TLV_DB_SCALE_ITEM(-500, 0, 0), 101 43, 43, TLV_DB_SCALE_ITEM(-340, 0, 0), 102 44, 44, TLV_DB_SCALE_ITEM(-190, 0, 0), 103 45, 45, TLV_DB_SCALE_ITEM(-50, 0, 0), 104 46, 46, TLV_DB_SCALE_ITEM(50, 0, 0), 105 47, 50, TLV_DB_SCALE_ITEM(120, 40, 0), 106 51, 57, TLV_DB_SCALE_ITEM(290, 50, 0), 107 58, 58, TLV_DB_SCALE_ITEM(650, 0, 0), 108 59, 62, TLV_DB_SCALE_ITEM(700, 60, 0), 109 63, 63, TLV_DB_SCALE_ITEM(950, 0, 0) 110 ); 111 112 static const struct snd_kcontrol_new max9768_volume[] = { 113 SOC_SINGLE_TLV("Playback Volume", MAX9768_VOL, 0, 63, 0, volume_tlv), 114 }; 115 116 static const struct snd_kcontrol_new max9768_mute[] = { 117 SOC_SINGLE_BOOL_EXT("Playback Switch", 0, max9768_get_gpio, max9768_set_gpio), 118 }; 119 120 static const struct snd_soc_dapm_widget max9768_dapm_widgets[] = { 121 SND_SOC_DAPM_INPUT("IN"), 122 123 SND_SOC_DAPM_OUTPUT("OUT+"), 124 SND_SOC_DAPM_OUTPUT("OUT-"), 125 }; 126 127 static const struct snd_soc_dapm_route max9768_dapm_routes[] = { 128 { "OUT+", NULL, "IN" }, 129 { "OUT-", NULL, "IN" }, 130 }; 131 132 static int max9768_probe(struct snd_soc_component *component) 133 { 134 struct max9768 *max9768 = snd_soc_component_get_drvdata(component); 135 int ret; 136 137 if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) { 138 ret = regmap_write(max9768->regmap, MAX9768_CTRL, 139 MAX9768_CTRL_PWM); 140 if (ret) 141 return ret; 142 } 143 144 if (gpio_is_valid(max9768->mute_gpio)) { 145 ret = snd_soc_add_component_controls(component, max9768_mute, 146 ARRAY_SIZE(max9768_mute)); 147 if (ret) 148 return ret; 149 } 150 151 return 0; 152 } 153 154 static const struct snd_soc_component_driver max9768_component_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 = devm_gpio_request_one(&client->dev, pdata->mute_gpio, 187 GPIOF_INIT_HIGH, "MAX9768 Mute"); 188 max9768->mute_gpio = err ?: pdata->mute_gpio; 189 190 /* Activate chip by releasing shutdown, enables I2C */ 191 err = devm_gpio_request_one(&client->dev, pdata->shdn_gpio, 192 GPIOF_INIT_HIGH, "MAX9768 Shutdown"); 193 max9768->shdn_gpio = err ?: pdata->shdn_gpio; 194 195 max9768->flags = pdata->flags; 196 } else { 197 max9768->shdn_gpio = -EINVAL; 198 max9768->mute_gpio = -EINVAL; 199 } 200 201 i2c_set_clientdata(client, max9768); 202 203 max9768->regmap = devm_regmap_init_i2c(client, &max9768_i2c_regmap_config); 204 if (IS_ERR(max9768->regmap)) 205 return PTR_ERR(max9768->regmap); 206 207 return devm_snd_soc_register_component(&client->dev, 208 &max9768_component_driver, NULL, 0); 209 } 210 211 static const struct i2c_device_id max9768_i2c_id[] = { 212 { "max9768", 0 }, 213 { } 214 }; 215 MODULE_DEVICE_TABLE(i2c, max9768_i2c_id); 216 217 static struct i2c_driver max9768_i2c_driver = { 218 .driver = { 219 .name = "max9768", 220 }, 221 .probe = max9768_i2c_probe, 222 .id_table = max9768_i2c_id, 223 }; 224 module_i2c_driver(max9768_i2c_driver); 225 226 MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>"); 227 MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver"); 228 MODULE_LICENSE("GPL v2"); 229