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