1 /* 2 * Regulator support for WM8400 3 * 4 * Copyright 2008 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 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of the 11 * License, or (at your option) any later version. 12 * 13 */ 14 15 #include <linux/bug.h> 16 #include <linux/err.h> 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/regulator/driver.h> 20 #include <linux/mfd/wm8400-private.h> 21 22 static const struct regulator_linear_range wm8400_ldo_ranges[] = { 23 REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000), 24 REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000), 25 }; 26 27 static struct regulator_ops wm8400_ldo_ops = { 28 .is_enabled = regulator_is_enabled_regmap, 29 .enable = regulator_enable_regmap, 30 .disable = regulator_disable_regmap, 31 .list_voltage = regulator_list_voltage_linear_range, 32 .get_voltage_sel = regulator_get_voltage_sel_regmap, 33 .set_voltage_sel = regulator_set_voltage_sel_regmap, 34 .map_voltage = regulator_map_voltage_linear_range, 35 }; 36 37 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) 38 { 39 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 40 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 41 u16 data[2]; 42 int ret; 43 44 ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, 45 data); 46 if (ret != 0) 47 return 0; 48 49 /* Datasheet: hibernate */ 50 if (data[0] & WM8400_DC1_SLEEP) 51 return REGULATOR_MODE_STANDBY; 52 53 /* Datasheet: standby */ 54 if (!(data[0] & WM8400_DC1_ACTIVE)) 55 return REGULATOR_MODE_IDLE; 56 57 /* Datasheet: active with or without force PWM */ 58 if (data[1] & WM8400_DC1_FRC_PWM) 59 return REGULATOR_MODE_FAST; 60 else 61 return REGULATOR_MODE_NORMAL; 62 } 63 64 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) 65 { 66 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 67 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 68 int ret; 69 70 switch (mode) { 71 case REGULATOR_MODE_FAST: 72 /* Datasheet: active with force PWM */ 73 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 74 WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); 75 if (ret != 0) 76 return ret; 77 78 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 79 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 80 WM8400_DC1_ACTIVE); 81 82 case REGULATOR_MODE_NORMAL: 83 /* Datasheet: active */ 84 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 85 WM8400_DC1_FRC_PWM, 0); 86 if (ret != 0) 87 return ret; 88 89 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 90 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 91 WM8400_DC1_ACTIVE); 92 93 case REGULATOR_MODE_IDLE: 94 /* Datasheet: standby */ 95 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 96 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0); 97 default: 98 return -EINVAL; 99 } 100 } 101 102 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, 103 int input_uV, int output_uV, 104 int load_uA) 105 { 106 return REGULATOR_MODE_NORMAL; 107 } 108 109 static struct regulator_ops wm8400_dcdc_ops = { 110 .is_enabled = regulator_is_enabled_regmap, 111 .enable = regulator_enable_regmap, 112 .disable = regulator_disable_regmap, 113 .list_voltage = regulator_list_voltage_linear, 114 .map_voltage = regulator_map_voltage_linear, 115 .get_voltage_sel = regulator_get_voltage_sel_regmap, 116 .set_voltage_sel = regulator_set_voltage_sel_regmap, 117 .get_mode = wm8400_dcdc_get_mode, 118 .set_mode = wm8400_dcdc_set_mode, 119 .get_optimum_mode = wm8400_dcdc_get_optimum_mode, 120 }; 121 122 static struct regulator_desc regulators[] = { 123 { 124 .name = "LDO1", 125 .id = WM8400_LDO1, 126 .ops = &wm8400_ldo_ops, 127 .enable_reg = WM8400_LDO1_CONTROL, 128 .enable_mask = WM8400_LDO1_ENA, 129 .n_voltages = WM8400_LDO1_VSEL_MASK + 1, 130 .linear_ranges = wm8400_ldo_ranges, 131 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), 132 .vsel_reg = WM8400_LDO1_CONTROL, 133 .vsel_mask = WM8400_LDO1_VSEL_MASK, 134 .type = REGULATOR_VOLTAGE, 135 .owner = THIS_MODULE, 136 }, 137 { 138 .name = "LDO2", 139 .id = WM8400_LDO2, 140 .ops = &wm8400_ldo_ops, 141 .enable_reg = WM8400_LDO2_CONTROL, 142 .enable_mask = WM8400_LDO2_ENA, 143 .n_voltages = WM8400_LDO2_VSEL_MASK + 1, 144 .linear_ranges = wm8400_ldo_ranges, 145 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), 146 .type = REGULATOR_VOLTAGE, 147 .vsel_reg = WM8400_LDO2_CONTROL, 148 .vsel_mask = WM8400_LDO2_VSEL_MASK, 149 .owner = THIS_MODULE, 150 }, 151 { 152 .name = "LDO3", 153 .id = WM8400_LDO3, 154 .ops = &wm8400_ldo_ops, 155 .enable_reg = WM8400_LDO3_CONTROL, 156 .enable_mask = WM8400_LDO3_ENA, 157 .n_voltages = WM8400_LDO3_VSEL_MASK + 1, 158 .linear_ranges = wm8400_ldo_ranges, 159 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), 160 .vsel_reg = WM8400_LDO3_CONTROL, 161 .vsel_mask = WM8400_LDO3_VSEL_MASK, 162 .type = REGULATOR_VOLTAGE, 163 .owner = THIS_MODULE, 164 }, 165 { 166 .name = "LDO4", 167 .id = WM8400_LDO4, 168 .ops = &wm8400_ldo_ops, 169 .enable_reg = WM8400_LDO4_CONTROL, 170 .enable_mask = WM8400_LDO4_ENA, 171 .n_voltages = WM8400_LDO4_VSEL_MASK + 1, 172 .linear_ranges = wm8400_ldo_ranges, 173 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges), 174 .vsel_reg = WM8400_LDO4_CONTROL, 175 .vsel_mask = WM8400_LDO4_VSEL_MASK, 176 .type = REGULATOR_VOLTAGE, 177 .owner = THIS_MODULE, 178 }, 179 { 180 .name = "DCDC1", 181 .id = WM8400_DCDC1, 182 .ops = &wm8400_dcdc_ops, 183 .enable_reg = WM8400_DCDC1_CONTROL_1, 184 .enable_mask = WM8400_DC1_ENA_MASK, 185 .n_voltages = WM8400_DC1_VSEL_MASK + 1, 186 .vsel_reg = WM8400_DCDC1_CONTROL_1, 187 .vsel_mask = WM8400_DC1_VSEL_MASK, 188 .min_uV = 850000, 189 .uV_step = 25000, 190 .type = REGULATOR_VOLTAGE, 191 .owner = THIS_MODULE, 192 }, 193 { 194 .name = "DCDC2", 195 .id = WM8400_DCDC2, 196 .ops = &wm8400_dcdc_ops, 197 .enable_reg = WM8400_DCDC2_CONTROL_1, 198 .enable_mask = WM8400_DC1_ENA_MASK, 199 .n_voltages = WM8400_DC2_VSEL_MASK + 1, 200 .vsel_reg = WM8400_DCDC2_CONTROL_1, 201 .vsel_mask = WM8400_DC2_VSEL_MASK, 202 .min_uV = 850000, 203 .uV_step = 25000, 204 .type = REGULATOR_VOLTAGE, 205 .owner = THIS_MODULE, 206 }, 207 }; 208 209 static int wm8400_regulator_probe(struct platform_device *pdev) 210 { 211 struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); 212 struct regulator_config config = { }; 213 struct regulator_dev *rdev; 214 215 config.dev = &pdev->dev; 216 config.init_data = dev_get_platdata(&pdev->dev); 217 config.driver_data = wm8400; 218 config.regmap = wm8400->regmap; 219 220 rdev = devm_regulator_register(&pdev->dev, ®ulators[pdev->id], 221 &config); 222 if (IS_ERR(rdev)) 223 return PTR_ERR(rdev); 224 225 platform_set_drvdata(pdev, rdev); 226 227 return 0; 228 } 229 230 static struct platform_driver wm8400_regulator_driver = { 231 .driver = { 232 .name = "wm8400-regulator", 233 }, 234 .probe = wm8400_regulator_probe, 235 }; 236 237 /** 238 * wm8400_register_regulator - enable software control of a WM8400 regulator 239 * 240 * This function enables software control of a WM8400 regulator via 241 * the regulator API. It is intended to be called from the 242 * platform_init() callback of the WM8400 MFD driver. 243 * 244 * @param dev The WM8400 device to operate on. 245 * @param reg The regulator to control. 246 * @param initdata Regulator initdata for the regulator. 247 */ 248 int wm8400_register_regulator(struct device *dev, int reg, 249 struct regulator_init_data *initdata) 250 { 251 struct wm8400 *wm8400 = dev_get_drvdata(dev); 252 253 if (wm8400->regulators[reg].name) 254 return -EBUSY; 255 256 initdata->driver_data = wm8400; 257 258 wm8400->regulators[reg].name = "wm8400-regulator"; 259 wm8400->regulators[reg].id = reg; 260 wm8400->regulators[reg].dev.parent = dev; 261 wm8400->regulators[reg].dev.platform_data = initdata; 262 263 return platform_device_register(&wm8400->regulators[reg]); 264 } 265 EXPORT_SYMBOL_GPL(wm8400_register_regulator); 266 267 static int __init wm8400_regulator_init(void) 268 { 269 return platform_driver_register(&wm8400_regulator_driver); 270 } 271 subsys_initcall(wm8400_regulator_init); 272 273 static void __exit wm8400_regulator_exit(void) 274 { 275 platform_driver_unregister(&wm8400_regulator_driver); 276 } 277 module_exit(wm8400_regulator_exit); 278 279 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 280 MODULE_DESCRIPTION("WM8400 regulator driver"); 281 MODULE_LICENSE("GPL"); 282 MODULE_ALIAS("platform:wm8400-regulator"); 283