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 int wm8400_ldo_list_voltage(struct regulator_dev *dev, 23 unsigned selector) 24 { 25 if (selector > WM8400_LDO1_VSEL_MASK) 26 return -EINVAL; 27 28 if (selector < 15) 29 return 900000 + (selector * 50000); 30 else 31 return 1700000 + ((selector - 15) * 100000); 32 } 33 34 static int wm8400_ldo_map_voltage(struct regulator_dev *dev, 35 int min_uV, int max_uV) 36 { 37 u16 val; 38 int volt; 39 40 if (min_uV < 900000 || min_uV > 3300000) 41 return -EINVAL; 42 43 if (min_uV < 1700000) /* Steps of 50mV from 900mV; */ 44 val = DIV_ROUND_UP(min_uV - 900000, 50000); 45 else /* Steps of 100mV from 1700mV */ 46 val = DIV_ROUND_UP(min_uV - 1700000, 100000) + 15; 47 48 volt = wm8400_ldo_list_voltage(dev, val); 49 if (volt < min_uV || volt > max_uV) 50 return -EINVAL; 51 52 return val; 53 } 54 55 static struct regulator_ops wm8400_ldo_ops = { 56 .is_enabled = regulator_is_enabled_regmap, 57 .enable = regulator_enable_regmap, 58 .disable = regulator_disable_regmap, 59 .list_voltage = wm8400_ldo_list_voltage, 60 .get_voltage_sel = regulator_get_voltage_sel_regmap, 61 .set_voltage_sel = regulator_set_voltage_sel_regmap, 62 .map_voltage = wm8400_ldo_map_voltage, 63 }; 64 65 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) 66 { 67 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 68 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 69 u16 data[2]; 70 int ret; 71 72 ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, 73 data); 74 if (ret != 0) 75 return 0; 76 77 /* Datasheet: hibernate */ 78 if (data[0] & WM8400_DC1_SLEEP) 79 return REGULATOR_MODE_STANDBY; 80 81 /* Datasheet: standby */ 82 if (!(data[0] & WM8400_DC1_ACTIVE)) 83 return REGULATOR_MODE_IDLE; 84 85 /* Datasheet: active with or without force PWM */ 86 if (data[1] & WM8400_DC1_FRC_PWM) 87 return REGULATOR_MODE_FAST; 88 else 89 return REGULATOR_MODE_NORMAL; 90 } 91 92 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) 93 { 94 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 95 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 96 int ret; 97 98 switch (mode) { 99 case REGULATOR_MODE_FAST: 100 /* Datasheet: active with force PWM */ 101 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 102 WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); 103 if (ret != 0) 104 return ret; 105 106 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 107 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 108 WM8400_DC1_ACTIVE); 109 110 case REGULATOR_MODE_NORMAL: 111 /* Datasheet: active */ 112 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 113 WM8400_DC1_FRC_PWM, 0); 114 if (ret != 0) 115 return ret; 116 117 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 118 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 119 WM8400_DC1_ACTIVE); 120 121 case REGULATOR_MODE_IDLE: 122 /* Datasheet: standby */ 123 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 124 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0); 125 default: 126 return -EINVAL; 127 } 128 } 129 130 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, 131 int input_uV, int output_uV, 132 int load_uA) 133 { 134 return REGULATOR_MODE_NORMAL; 135 } 136 137 static struct regulator_ops wm8400_dcdc_ops = { 138 .is_enabled = regulator_is_enabled_regmap, 139 .enable = regulator_enable_regmap, 140 .disable = regulator_disable_regmap, 141 .list_voltage = regulator_list_voltage_linear, 142 .map_voltage = regulator_map_voltage_linear, 143 .get_voltage_sel = regulator_get_voltage_sel_regmap, 144 .set_voltage_sel = regulator_set_voltage_sel_regmap, 145 .get_mode = wm8400_dcdc_get_mode, 146 .set_mode = wm8400_dcdc_set_mode, 147 .get_optimum_mode = wm8400_dcdc_get_optimum_mode, 148 }; 149 150 static struct regulator_desc regulators[] = { 151 { 152 .name = "LDO1", 153 .id = WM8400_LDO1, 154 .ops = &wm8400_ldo_ops, 155 .enable_reg = WM8400_LDO1_CONTROL, 156 .enable_mask = WM8400_LDO1_ENA, 157 .n_voltages = WM8400_LDO1_VSEL_MASK + 1, 158 .vsel_reg = WM8400_LDO1_CONTROL, 159 .vsel_mask = WM8400_LDO1_VSEL_MASK, 160 .type = REGULATOR_VOLTAGE, 161 .owner = THIS_MODULE, 162 }, 163 { 164 .name = "LDO2", 165 .id = WM8400_LDO2, 166 .ops = &wm8400_ldo_ops, 167 .enable_reg = WM8400_LDO2_CONTROL, 168 .enable_mask = WM8400_LDO2_ENA, 169 .n_voltages = WM8400_LDO2_VSEL_MASK + 1, 170 .type = REGULATOR_VOLTAGE, 171 .vsel_reg = WM8400_LDO2_CONTROL, 172 .vsel_mask = WM8400_LDO2_VSEL_MASK, 173 .owner = THIS_MODULE, 174 }, 175 { 176 .name = "LDO3", 177 .id = WM8400_LDO3, 178 .ops = &wm8400_ldo_ops, 179 .enable_reg = WM8400_LDO3_CONTROL, 180 .enable_mask = WM8400_LDO3_ENA, 181 .n_voltages = WM8400_LDO3_VSEL_MASK + 1, 182 .vsel_reg = WM8400_LDO3_CONTROL, 183 .vsel_mask = WM8400_LDO3_VSEL_MASK, 184 .type = REGULATOR_VOLTAGE, 185 .owner = THIS_MODULE, 186 }, 187 { 188 .name = "LDO4", 189 .id = WM8400_LDO4, 190 .ops = &wm8400_ldo_ops, 191 .enable_reg = WM8400_LDO4_CONTROL, 192 .enable_mask = WM8400_LDO4_ENA, 193 .n_voltages = WM8400_LDO4_VSEL_MASK + 1, 194 .vsel_reg = WM8400_LDO4_CONTROL, 195 .vsel_mask = WM8400_LDO4_VSEL_MASK, 196 .type = REGULATOR_VOLTAGE, 197 .owner = THIS_MODULE, 198 }, 199 { 200 .name = "DCDC1", 201 .id = WM8400_DCDC1, 202 .ops = &wm8400_dcdc_ops, 203 .enable_reg = WM8400_DCDC1_CONTROL_1, 204 .enable_mask = WM8400_DC1_ENA_MASK, 205 .n_voltages = WM8400_DC1_VSEL_MASK + 1, 206 .vsel_reg = WM8400_DCDC1_CONTROL_1, 207 .vsel_mask = WM8400_DC1_VSEL_MASK, 208 .min_uV = 850000, 209 .uV_step = 25000, 210 .type = REGULATOR_VOLTAGE, 211 .owner = THIS_MODULE, 212 }, 213 { 214 .name = "DCDC2", 215 .id = WM8400_DCDC2, 216 .ops = &wm8400_dcdc_ops, 217 .enable_reg = WM8400_DCDC2_CONTROL_1, 218 .enable_mask = WM8400_DC1_ENA_MASK, 219 .n_voltages = WM8400_DC2_VSEL_MASK + 1, 220 .vsel_reg = WM8400_DCDC2_CONTROL_1, 221 .vsel_mask = WM8400_DC2_VSEL_MASK, 222 .min_uV = 850000, 223 .uV_step = 25000, 224 .type = REGULATOR_VOLTAGE, 225 .owner = THIS_MODULE, 226 }, 227 }; 228 229 static int __devinit wm8400_regulator_probe(struct platform_device *pdev) 230 { 231 struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); 232 struct regulator_config config = { }; 233 struct regulator_dev *rdev; 234 235 config.dev = &pdev->dev; 236 config.init_data = pdev->dev.platform_data; 237 config.driver_data = wm8400; 238 config.regmap = wm8400->regmap; 239 240 rdev = regulator_register(®ulators[pdev->id], &config); 241 if (IS_ERR(rdev)) 242 return PTR_ERR(rdev); 243 244 platform_set_drvdata(pdev, rdev); 245 246 return 0; 247 } 248 249 static int __devexit wm8400_regulator_remove(struct platform_device *pdev) 250 { 251 struct regulator_dev *rdev = platform_get_drvdata(pdev); 252 253 platform_set_drvdata(pdev, NULL); 254 regulator_unregister(rdev); 255 256 return 0; 257 } 258 259 static struct platform_driver wm8400_regulator_driver = { 260 .driver = { 261 .name = "wm8400-regulator", 262 }, 263 .probe = wm8400_regulator_probe, 264 .remove = __devexit_p(wm8400_regulator_remove), 265 }; 266 267 /** 268 * wm8400_register_regulator - enable software control of a WM8400 regulator 269 * 270 * This function enables software control of a WM8400 regulator via 271 * the regulator API. It is intended to be called from the 272 * platform_init() callback of the WM8400 MFD driver. 273 * 274 * @param dev The WM8400 device to operate on. 275 * @param reg The regulator to control. 276 * @param initdata Regulator initdata for the regulator. 277 */ 278 int wm8400_register_regulator(struct device *dev, int reg, 279 struct regulator_init_data *initdata) 280 { 281 struct wm8400 *wm8400 = dev_get_drvdata(dev); 282 283 if (wm8400->regulators[reg].name) 284 return -EBUSY; 285 286 initdata->driver_data = wm8400; 287 288 wm8400->regulators[reg].name = "wm8400-regulator"; 289 wm8400->regulators[reg].id = reg; 290 wm8400->regulators[reg].dev.parent = dev; 291 wm8400->regulators[reg].dev.platform_data = initdata; 292 293 return platform_device_register(&wm8400->regulators[reg]); 294 } 295 EXPORT_SYMBOL_GPL(wm8400_register_regulator); 296 297 static int __init wm8400_regulator_init(void) 298 { 299 return platform_driver_register(&wm8400_regulator_driver); 300 } 301 subsys_initcall(wm8400_regulator_init); 302 303 static void __exit wm8400_regulator_exit(void) 304 { 305 platform_driver_unregister(&wm8400_regulator_driver); 306 } 307 module_exit(wm8400_regulator_exit); 308 309 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 310 MODULE_DESCRIPTION("WM8400 regulator driver"); 311 MODULE_LICENSE("GPL"); 312 MODULE_ALIAS("platform:wm8400-regulator"); 313