1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * MAX9768 AMP driver 4 * 5 * Copyright (C) 2011, 2012 by Wolfram Sang, Pengutronix e.K. 6 */ 7 8 #include <linux/init.h> 9 #include <linux/module.h> 10 #include <linux/i2c.h> 11 #include <linux/slab.h> 12 #include <linux/gpio/consumer.h> 13 #include <linux/regmap.h> 14 15 #include <sound/core.h> 16 #include <sound/soc.h> 17 #include <sound/tlv.h> 18 #include <sound/max9768.h> 19 20 /* "Registers" */ 21 #define MAX9768_VOL 0 22 #define MAX9768_CTRL 3 23 24 /* Commands */ 25 #define MAX9768_CTRL_PWM 0x15 26 #define MAX9768_CTRL_FILTERLESS 0x16 27 28 struct max9768 { 29 struct regmap *regmap; 30 struct gpio_desc *mute; 31 struct gpio_desc *shdn; 32 u32 flags; 33 }; 34 35 static const struct reg_default max9768_default_regs[] = { 36 { 0, 0 }, 37 { 3, MAX9768_CTRL_FILTERLESS}, 38 }; 39 40 static int max9768_get_gpio(struct snd_kcontrol *kcontrol, 41 struct snd_ctl_elem_value *ucontrol) 42 { 43 struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol); 44 struct max9768 *max9768 = snd_soc_component_get_drvdata(c); 45 int val = gpiod_get_value_cansleep(max9768->mute); 46 47 ucontrol->value.integer.value[0] = !val; 48 49 return 0; 50 } 51 52 static int max9768_set_gpio(struct snd_kcontrol *kcontrol, 53 struct snd_ctl_elem_value *ucontrol) 54 { 55 struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol); 56 struct max9768 *max9768 = snd_soc_component_get_drvdata(c); 57 bool val = !ucontrol->value.integer.value[0]; 58 int ret; 59 60 if (val != gpiod_get_value_cansleep(max9768->mute)) 61 ret = 1; 62 else 63 ret = 0; 64 65 gpiod_set_value_cansleep(max9768->mute, val); 66 67 return ret; 68 } 69 70 static const DECLARE_TLV_DB_RANGE(volume_tlv, 71 0, 0, TLV_DB_SCALE_ITEM(-16150, 0, 0), 72 1, 1, TLV_DB_SCALE_ITEM(-9280, 0, 0), 73 2, 2, TLV_DB_SCALE_ITEM(-9030, 0, 0), 74 3, 3, TLV_DB_SCALE_ITEM(-8680, 0, 0), 75 4, 4, TLV_DB_SCALE_ITEM(-8430, 0, 0), 76 5, 5, TLV_DB_SCALE_ITEM(-8080, 0, 0), 77 6, 6, TLV_DB_SCALE_ITEM(-7830, 0, 0), 78 7, 7, TLV_DB_SCALE_ITEM(-7470, 0, 0), 79 8, 8, TLV_DB_SCALE_ITEM(-7220, 0, 0), 80 9, 9, TLV_DB_SCALE_ITEM(-6870, 0, 0), 81 10, 10, TLV_DB_SCALE_ITEM(-6620, 0, 0), 82 11, 11, TLV_DB_SCALE_ITEM(-6270, 0, 0), 83 12, 12, TLV_DB_SCALE_ITEM(-6020, 0, 0), 84 13, 13, TLV_DB_SCALE_ITEM(-5670, 0, 0), 85 14, 14, TLV_DB_SCALE_ITEM(-5420, 0, 0), 86 15, 17, TLV_DB_SCALE_ITEM(-5060, 250, 0), 87 18, 18, TLV_DB_SCALE_ITEM(-4370, 0, 0), 88 19, 19, TLV_DB_SCALE_ITEM(-4210, 0, 0), 89 20, 20, TLV_DB_SCALE_ITEM(-3960, 0, 0), 90 21, 21, TLV_DB_SCALE_ITEM(-3760, 0, 0), 91 22, 22, TLV_DB_SCALE_ITEM(-3600, 0, 0), 92 23, 23, TLV_DB_SCALE_ITEM(-3340, 0, 0), 93 24, 24, TLV_DB_SCALE_ITEM(-3150, 0, 0), 94 25, 25, TLV_DB_SCALE_ITEM(-2980, 0, 0), 95 26, 26, TLV_DB_SCALE_ITEM(-2720, 0, 0), 96 27, 27, TLV_DB_SCALE_ITEM(-2520, 0, 0), 97 28, 30, TLV_DB_SCALE_ITEM(-2350, 190, 0), 98 31, 31, TLV_DB_SCALE_ITEM(-1750, 0, 0), 99 32, 34, TLV_DB_SCALE_ITEM(-1640, 100, 0), 100 35, 37, TLV_DB_SCALE_ITEM(-1310, 110, 0), 101 38, 39, TLV_DB_SCALE_ITEM(-990, 100, 0), 102 40, 40, TLV_DB_SCALE_ITEM(-710, 0, 0), 103 41, 41, TLV_DB_SCALE_ITEM(-600, 0, 0), 104 42, 42, TLV_DB_SCALE_ITEM(-500, 0, 0), 105 43, 43, TLV_DB_SCALE_ITEM(-340, 0, 0), 106 44, 44, TLV_DB_SCALE_ITEM(-190, 0, 0), 107 45, 45, TLV_DB_SCALE_ITEM(-50, 0, 0), 108 46, 46, TLV_DB_SCALE_ITEM(50, 0, 0), 109 47, 50, TLV_DB_SCALE_ITEM(120, 40, 0), 110 51, 57, TLV_DB_SCALE_ITEM(290, 50, 0), 111 58, 58, TLV_DB_SCALE_ITEM(650, 0, 0), 112 59, 62, TLV_DB_SCALE_ITEM(700, 60, 0), 113 63, 63, TLV_DB_SCALE_ITEM(950, 0, 0) 114 ); 115 116 static const struct snd_kcontrol_new max9768_volume[] = { 117 SOC_SINGLE_TLV("Playback Volume", MAX9768_VOL, 0, 63, 0, volume_tlv), 118 }; 119 120 static const struct snd_kcontrol_new max9768_mute[] = { 121 SOC_SINGLE_BOOL_EXT("Playback Switch", 0, max9768_get_gpio, max9768_set_gpio), 122 }; 123 124 static const struct snd_soc_dapm_widget max9768_dapm_widgets[] = { 125 SND_SOC_DAPM_INPUT("IN"), 126 127 SND_SOC_DAPM_OUTPUT("OUT+"), 128 SND_SOC_DAPM_OUTPUT("OUT-"), 129 }; 130 131 static const struct snd_soc_dapm_route max9768_dapm_routes[] = { 132 { "OUT+", NULL, "IN" }, 133 { "OUT-", NULL, "IN" }, 134 }; 135 136 static int max9768_probe(struct snd_soc_component *component) 137 { 138 struct max9768 *max9768 = snd_soc_component_get_drvdata(component); 139 int ret; 140 141 if (max9768->flags & MAX9768_FLAG_CLASSIC_PWM) { 142 ret = regmap_write(max9768->regmap, MAX9768_CTRL, 143 MAX9768_CTRL_PWM); 144 if (ret) 145 return ret; 146 } 147 148 if (max9768->mute) { 149 ret = snd_soc_add_component_controls(component, max9768_mute, 150 ARRAY_SIZE(max9768_mute)); 151 if (ret) 152 return ret; 153 } 154 155 return 0; 156 } 157 158 static const struct snd_soc_component_driver max9768_component_driver = { 159 .probe = max9768_probe, 160 .controls = max9768_volume, 161 .num_controls = ARRAY_SIZE(max9768_volume), 162 .dapm_widgets = max9768_dapm_widgets, 163 .num_dapm_widgets = ARRAY_SIZE(max9768_dapm_widgets), 164 .dapm_routes = max9768_dapm_routes, 165 .num_dapm_routes = ARRAY_SIZE(max9768_dapm_routes), 166 }; 167 168 static const struct regmap_config max9768_i2c_regmap_config = { 169 .reg_bits = 2, 170 .val_bits = 6, 171 .max_register = 3, 172 .reg_defaults = max9768_default_regs, 173 .num_reg_defaults = ARRAY_SIZE(max9768_default_regs), 174 .cache_type = REGCACHE_RBTREE, 175 }; 176 177 static int max9768_i2c_probe(struct i2c_client *client) 178 { 179 struct max9768 *max9768; 180 struct max9768_pdata *pdata = client->dev.platform_data; 181 182 max9768 = devm_kzalloc(&client->dev, sizeof(*max9768), GFP_KERNEL); 183 if (!max9768) 184 return -ENOMEM; 185 186 /* Mute on powerup to avoid clicks */ 187 max9768->mute = devm_gpiod_get_optional(&client->dev, 188 "mute", 189 GPIOD_OUT_HIGH); 190 if (IS_ERR(max9768->mute)) 191 return PTR_ERR(max9768->mute); 192 gpiod_set_consumer_name(max9768->mute, "MAX9768 Mute"); 193 194 /* Activate chip by releasing shutdown, enables I2C */ 195 max9768->shdn = devm_gpiod_get_optional(&client->dev, 196 "shutdown", 197 GPIOD_OUT_HIGH); 198 if (IS_ERR(max9768->shdn)) 199 return PTR_ERR(max9768->shdn); 200 gpiod_set_consumer_name(max9768->shdn, "MAX9768 Shutdown"); 201 202 if (pdata) 203 max9768->flags = pdata->flags; 204 205 i2c_set_clientdata(client, max9768); 206 207 max9768->regmap = devm_regmap_init_i2c(client, &max9768_i2c_regmap_config); 208 if (IS_ERR(max9768->regmap)) 209 return PTR_ERR(max9768->regmap); 210 211 return devm_snd_soc_register_component(&client->dev, 212 &max9768_component_driver, NULL, 0); 213 } 214 215 static const struct i2c_device_id max9768_i2c_id[] = { 216 { "max9768" }, 217 { } 218 }; 219 MODULE_DEVICE_TABLE(i2c, max9768_i2c_id); 220 221 static struct i2c_driver max9768_i2c_driver = { 222 .driver = { 223 .name = "max9768", 224 }, 225 .probe = max9768_i2c_probe, 226 .id_table = max9768_i2c_id, 227 }; 228 module_i2c_driver(max9768_i2c_driver); 229 230 MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>"); 231 MODULE_DESCRIPTION("ASoC MAX9768 amplifier driver"); 232 MODULE_LICENSE("GPL v2"); 233