1 /* 2 * wm8994-regulator.c -- Regulator driver for the WM8994 3 * 4 * Copyright 2009 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/init.h> 17 #include <linux/bitops.h> 18 #include <linux/err.h> 19 #include <linux/platform_device.h> 20 #include <linux/regulator/driver.h> 21 #include <linux/regulator/machine.h> 22 #include <linux/gpio/consumer.h> 23 #include <linux/slab.h> 24 25 #include <linux/mfd/wm8994/core.h> 26 #include <linux/mfd/wm8994/registers.h> 27 #include <linux/mfd/wm8994/pdata.h> 28 29 struct wm8994_ldo { 30 struct regulator_dev *regulator; 31 struct wm8994 *wm8994; 32 struct regulator_consumer_supply supply; 33 struct regulator_init_data init_data; 34 }; 35 36 #define WM8994_LDO1_MAX_SELECTOR 0x7 37 #define WM8994_LDO2_MAX_SELECTOR 0x3 38 39 static const struct regulator_ops wm8994_ldo1_ops = { 40 .list_voltage = regulator_list_voltage_linear, 41 .map_voltage = regulator_map_voltage_linear, 42 .get_voltage_sel = regulator_get_voltage_sel_regmap, 43 .set_voltage_sel = regulator_set_voltage_sel_regmap, 44 }; 45 46 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev, 47 unsigned int selector) 48 { 49 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); 50 51 if (selector > WM8994_LDO2_MAX_SELECTOR) 52 return -EINVAL; 53 54 switch (ldo->wm8994->type) { 55 case WM8994: 56 return (selector * 100000) + 900000; 57 case WM8958: 58 return (selector * 100000) + 1000000; 59 case WM1811: 60 switch (selector) { 61 case 0: 62 return -EINVAL; 63 default: 64 return (selector * 100000) + 950000; 65 } 66 break; 67 default: 68 return -EINVAL; 69 } 70 } 71 72 static const struct regulator_ops wm8994_ldo2_ops = { 73 .list_voltage = wm8994_ldo2_list_voltage, 74 .get_voltage_sel = regulator_get_voltage_sel_regmap, 75 .set_voltage_sel = regulator_set_voltage_sel_regmap, 76 }; 77 78 static const struct regulator_desc wm8994_ldo_desc[] = { 79 { 80 .name = "LDO1", 81 .id = 1, 82 .type = REGULATOR_VOLTAGE, 83 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, 84 .vsel_reg = WM8994_LDO_1, 85 .vsel_mask = WM8994_LDO1_VSEL_MASK, 86 .ops = &wm8994_ldo1_ops, 87 .min_uV = 2400000, 88 .uV_step = 100000, 89 .enable_time = 3000, 90 .owner = THIS_MODULE, 91 }, 92 { 93 .name = "LDO2", 94 .id = 2, 95 .type = REGULATOR_VOLTAGE, 96 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, 97 .vsel_reg = WM8994_LDO_2, 98 .vsel_mask = WM8994_LDO2_VSEL_MASK, 99 .ops = &wm8994_ldo2_ops, 100 .enable_time = 3000, 101 .owner = THIS_MODULE, 102 }, 103 }; 104 105 static const struct regulator_consumer_supply wm8994_ldo_consumer[] = { 106 { .supply = "AVDD1" }, 107 { .supply = "DCVDD" }, 108 }; 109 110 static const struct regulator_init_data wm8994_ldo_default[] = { 111 { 112 .constraints = { 113 .valid_ops_mask = REGULATOR_CHANGE_STATUS, 114 }, 115 .num_consumer_supplies = 1, 116 }, 117 { 118 .constraints = { 119 .valid_ops_mask = REGULATOR_CHANGE_STATUS, 120 }, 121 .num_consumer_supplies = 1, 122 }, 123 }; 124 125 static int wm8994_ldo_probe(struct platform_device *pdev) 126 { 127 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); 128 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); 129 int id = pdev->id % ARRAY_SIZE(pdata->ldo); 130 struct regulator_config config = { }; 131 struct wm8994_ldo *ldo; 132 struct gpio_desc *gpiod; 133 int ret; 134 135 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); 136 137 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL); 138 if (!ldo) 139 return -ENOMEM; 140 141 ldo->wm8994 = wm8994; 142 ldo->supply = wm8994_ldo_consumer[id]; 143 ldo->supply.dev_name = dev_name(wm8994->dev); 144 145 config.dev = wm8994->dev; 146 config.driver_data = ldo; 147 config.regmap = wm8994->regmap; 148 config.init_data = &ldo->init_data; 149 150 /* 151 * Look up LDO enable GPIO from the parent device node, we don't 152 * use devm because the regulator core will free the GPIO 153 */ 154 gpiod = gpiod_get_optional(pdev->dev.parent, 155 id ? "wlf,ldo2ena" : "wlf,ldo1ena", 156 GPIOD_OUT_LOW | 157 GPIOD_FLAGS_BIT_NONEXCLUSIVE); 158 if (IS_ERR(gpiod)) 159 return PTR_ERR(gpiod); 160 config.ena_gpiod = gpiod; 161 162 /* Use default constraints if none set up */ 163 if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) { 164 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n", 165 ldo->supply.dev_name, ldo->supply.supply); 166 167 ldo->init_data = wm8994_ldo_default[id]; 168 ldo->init_data.consumer_supplies = &ldo->supply; 169 if (!gpiod) 170 ldo->init_data.constraints.valid_ops_mask = 0; 171 } else { 172 ldo->init_data = *pdata->ldo[id].init_data; 173 } 174 175 /* 176 * At this point the GPIO descriptor is handled over to the 177 * regulator core and we need not worry about it on the 178 * error path. 179 */ 180 ldo->regulator = devm_regulator_register(&pdev->dev, 181 &wm8994_ldo_desc[id], 182 &config); 183 if (IS_ERR(ldo->regulator)) { 184 ret = PTR_ERR(ldo->regulator); 185 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n", 186 id + 1, ret); 187 return ret; 188 } 189 190 platform_set_drvdata(pdev, ldo); 191 192 return 0; 193 } 194 195 static struct platform_driver wm8994_ldo_driver = { 196 .probe = wm8994_ldo_probe, 197 .driver = { 198 .name = "wm8994-ldo", 199 }, 200 }; 201 202 module_platform_driver(wm8994_ldo_driver); 203 204 /* Module information */ 205 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 206 MODULE_DESCRIPTION("WM8994 LDO driver"); 207 MODULE_LICENSE("GPL"); 208 MODULE_ALIAS("platform:wm8994-ldo"); 209