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 .off_on_delay = 36000, 86 .owner = THIS_MODULE, 87 }, 88 { 89 .name = "LDO2", 90 .id = 2, 91 .type = REGULATOR_VOLTAGE, 92 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, 93 .vsel_reg = WM8994_LDO_2, 94 .vsel_mask = WM8994_LDO2_VSEL_MASK, 95 .ops = &wm8994_ldo2_ops, 96 .enable_time = 3000, 97 .off_on_delay = 36000, 98 .owner = THIS_MODULE, 99 }, 100 }; 101 102 static const struct regulator_desc wm8958_ldo_desc[] = { 103 { 104 .name = "LDO1", 105 .id = 1, 106 .type = REGULATOR_VOLTAGE, 107 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, 108 .vsel_reg = WM8994_LDO_1, 109 .vsel_mask = WM8994_LDO1_VSEL_MASK, 110 .ops = &wm8994_ldo1_ops, 111 .min_uV = 2400000, 112 .uV_step = 100000, 113 .enable_time = 3000, 114 .owner = THIS_MODULE, 115 }, 116 { 117 .name = "LDO2", 118 .id = 2, 119 .type = REGULATOR_VOLTAGE, 120 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, 121 .vsel_reg = WM8994_LDO_2, 122 .vsel_mask = WM8994_LDO2_VSEL_MASK, 123 .ops = &wm8994_ldo2_ops, 124 .enable_time = 3000, 125 .owner = THIS_MODULE, 126 }, 127 }; 128 129 static const struct regulator_consumer_supply wm8994_ldo_consumer[] = { 130 { .supply = "AVDD1" }, 131 { .supply = "DCVDD" }, 132 }; 133 134 static const struct regulator_init_data wm8994_ldo_default[] = { 135 { 136 .constraints = { 137 .valid_ops_mask = REGULATOR_CHANGE_STATUS, 138 }, 139 .num_consumer_supplies = 1, 140 }, 141 { 142 .constraints = { 143 .valid_ops_mask = REGULATOR_CHANGE_STATUS, 144 }, 145 .num_consumer_supplies = 1, 146 }, 147 }; 148 149 static int wm8994_ldo_probe(struct platform_device *pdev) 150 { 151 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); 152 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); 153 int id = pdev->id % ARRAY_SIZE(pdata->ldo); 154 struct regulator_config config = { }; 155 struct wm8994_ldo *ldo; 156 struct gpio_desc *gpiod; 157 int ret; 158 159 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 160 161 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL); 162 if (!ldo) 163 return -ENOMEM; 164 165 ldo->wm8994 = wm8994; 166 ldo->supply = wm8994_ldo_consumer[id]; 167 ldo->supply.dev_name = dev_name(wm8994->dev); 168 169 config.dev = wm8994->dev; 170 config.driver_data = ldo; 171 config.regmap = wm8994->regmap; 172 config.init_data = &ldo->init_data; 173 174 /* 175 * Look up LDO enable GPIO from the parent device node, we don't 176 * use devm because the regulator core will free the GPIO 177 */ 178 gpiod = gpiod_get_optional(pdev->dev.parent, 179 id ? "wlf,ldo2ena" : "wlf,ldo1ena", 180 GPIOD_OUT_LOW | 181 GPIOD_FLAGS_BIT_NONEXCLUSIVE); 182 if (IS_ERR(gpiod)) 183 return PTR_ERR(gpiod); 184 config.ena_gpiod = gpiod; 185 186 /* Use default constraints if none set up */ 187 if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) { 188 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n", 189 ldo->supply.dev_name, ldo->supply.supply); 190 191 ldo->init_data = wm8994_ldo_default[id]; 192 ldo->init_data.consumer_supplies = &ldo->supply; 193 if (!gpiod) 194 ldo->init_data.constraints.valid_ops_mask = 0; 195 } else { 196 ldo->init_data = *pdata->ldo[id].init_data; 197 } 198 199 /* 200 * At this point the GPIO descriptor is handled over to the 201 * regulator core and we need not worry about it on the 202 * error path. 203 */ 204 if (ldo->wm8994->type == WM8994) { 205 ldo->regulator = devm_regulator_register(&pdev->dev, 206 &wm8994_ldo_desc[id], 207 &config); 208 } else { 209 ldo->regulator = devm_regulator_register(&pdev->dev, 210 &wm8958_ldo_desc[id], 211 &config); 212 } 213 214 if (IS_ERR(ldo->regulator)) { 215 ret = PTR_ERR(ldo->regulator); 216 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n", 217 id + 1, ret); 218 return ret; 219 } 220 221 platform_set_drvdata(pdev, ldo); 222 223 return 0; 224 } 225 226 static struct platform_driver wm8994_ldo_driver = { 227 .probe = wm8994_ldo_probe, 228 .driver = { 229 .name = "wm8994-ldo", 230 .probe_type = PROBE_FORCE_SYNCHRONOUS, 231 }, 232 }; 233 234 module_platform_driver(wm8994_ldo_driver); 235 236 /* Module information */ 237 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 238 MODULE_DESCRIPTION("WM8994 LDO driver"); 239 MODULE_LICENSE("GPL"); 240 MODULE_ALIAS("platform:wm8994-ldo"); 241