1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // wm8994-regulator.c -- Regulator driver for the WM8994 4 // 5 // Copyright 2009 Wolfson Microelectronics PLC. 6 // 7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8 9 #include <linux/module.h> 10 #include <linux/moduleparam.h> 11 #include <linux/init.h> 12 #include <linux/bitops.h> 13 #include <linux/err.h> 14 #include <linux/platform_device.h> 15 #include <linux/regulator/driver.h> 16 #include <linux/regulator/machine.h> 17 #include <linux/gpio/consumer.h> 18 #include <linux/slab.h> 19 20 #include <linux/mfd/wm8994/core.h> 21 #include <linux/mfd/wm8994/registers.h> 22 #include <linux/mfd/wm8994/pdata.h> 23 24 struct wm8994_ldo { 25 struct regulator_dev *regulator; 26 struct wm8994 *wm8994; 27 struct regulator_consumer_supply supply; 28 struct regulator_init_data init_data; 29 }; 30 31 #define WM8994_LDO1_MAX_SELECTOR 0x7 32 #define WM8994_LDO2_MAX_SELECTOR 0x3 33 34 static const struct regulator_ops wm8994_ldo1_ops = { 35 .list_voltage = regulator_list_voltage_linear, 36 .map_voltage = regulator_map_voltage_linear, 37 .get_voltage_sel = regulator_get_voltage_sel_regmap, 38 .set_voltage_sel = regulator_set_voltage_sel_regmap, 39 }; 40 41 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev, 42 unsigned int selector) 43 { 44 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); 45 46 if (selector > WM8994_LDO2_MAX_SELECTOR) 47 return -EINVAL; 48 49 switch (ldo->wm8994->type) { 50 case WM8994: 51 return (selector * 100000) + 900000; 52 case WM8958: 53 return (selector * 100000) + 1000000; 54 case WM1811: 55 switch (selector) { 56 case 0: 57 return -EINVAL; 58 default: 59 return (selector * 100000) + 950000; 60 } 61 break; 62 default: 63 return -EINVAL; 64 } 65 } 66 67 static const struct regulator_ops wm8994_ldo2_ops = { 68 .list_voltage = wm8994_ldo2_list_voltage, 69 .get_voltage_sel = regulator_get_voltage_sel_regmap, 70 .set_voltage_sel = regulator_set_voltage_sel_regmap, 71 }; 72 73 static const struct regulator_desc wm8994_ldo_desc[] = { 74 { 75 .name = "LDO1", 76 .id = 1, 77 .type = REGULATOR_VOLTAGE, 78 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, 79 .vsel_reg = WM8994_LDO_1, 80 .vsel_mask = WM8994_LDO1_VSEL_MASK, 81 .ops = &wm8994_ldo1_ops, 82 .min_uV = 2400000, 83 .uV_step = 100000, 84 .enable_time = 3000, 85 .owner = THIS_MODULE, 86 }, 87 { 88 .name = "LDO2", 89 .id = 2, 90 .type = REGULATOR_VOLTAGE, 91 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, 92 .vsel_reg = WM8994_LDO_2, 93 .vsel_mask = WM8994_LDO2_VSEL_MASK, 94 .ops = &wm8994_ldo2_ops, 95 .enable_time = 3000, 96 .owner = THIS_MODULE, 97 }, 98 }; 99 100 static const struct regulator_consumer_supply wm8994_ldo_consumer[] = { 101 { .supply = "AVDD1" }, 102 { .supply = "DCVDD" }, 103 }; 104 105 static const struct regulator_init_data wm8994_ldo_default[] = { 106 { 107 .constraints = { 108 .valid_ops_mask = REGULATOR_CHANGE_STATUS, 109 }, 110 .num_consumer_supplies = 1, 111 }, 112 { 113 .constraints = { 114 .valid_ops_mask = REGULATOR_CHANGE_STATUS, 115 }, 116 .num_consumer_supplies = 1, 117 }, 118 }; 119 120 static int wm8994_ldo_probe(struct platform_device *pdev) 121 { 122 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); 123 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); 124 int id = pdev->id % ARRAY_SIZE(pdata->ldo); 125 struct regulator_config config = { }; 126 struct wm8994_ldo *ldo; 127 struct gpio_desc *gpiod; 128 int ret; 129 130 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 131 132 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL); 133 if (!ldo) 134 return -ENOMEM; 135 136 ldo->wm8994 = wm8994; 137 ldo->supply = wm8994_ldo_consumer[id]; 138 ldo->supply.dev_name = dev_name(wm8994->dev); 139 140 config.dev = wm8994->dev; 141 config.driver_data = ldo; 142 config.regmap = wm8994->regmap; 143 config.init_data = &ldo->init_data; 144 145 /* 146 * Look up LDO enable GPIO from the parent device node, we don't 147 * use devm because the regulator core will free the GPIO 148 */ 149 gpiod = gpiod_get_optional(pdev->dev.parent, 150 id ? "wlf,ldo2ena" : "wlf,ldo1ena", 151 GPIOD_OUT_LOW | 152 GPIOD_FLAGS_BIT_NONEXCLUSIVE); 153 if (IS_ERR(gpiod)) 154 return PTR_ERR(gpiod); 155 config.ena_gpiod = gpiod; 156 157 /* Use default constraints if none set up */ 158 if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) { 159 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n", 160 ldo->supply.dev_name, ldo->supply.supply); 161 162 ldo->init_data = wm8994_ldo_default[id]; 163 ldo->init_data.consumer_supplies = &ldo->supply; 164 if (!gpiod) 165 ldo->init_data.constraints.valid_ops_mask = 0; 166 } else { 167 ldo->init_data = *pdata->ldo[id].init_data; 168 } 169 170 /* 171 * At this point the GPIO descriptor is handled over to the 172 * regulator core and we need not worry about it on the 173 * error path. 174 */ 175 ldo->regulator = devm_regulator_register(&pdev->dev, 176 &wm8994_ldo_desc[id], 177 &config); 178 if (IS_ERR(ldo->regulator)) { 179 ret = PTR_ERR(ldo->regulator); 180 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n", 181 id + 1, ret); 182 return ret; 183 } 184 185 platform_set_drvdata(pdev, ldo); 186 187 return 0; 188 } 189 190 static struct platform_driver wm8994_ldo_driver = { 191 .probe = wm8994_ldo_probe, 192 .driver = { 193 .name = "wm8994-ldo", 194 }, 195 }; 196 197 module_platform_driver(wm8994_ldo_driver); 198 199 /* Module information */ 200 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 201 MODULE_DESCRIPTION("WM8994 LDO driver"); 202 MODULE_LICENSE("GPL"); 203 MODULE_ALIAS("platform:wm8994-ldo"); 204