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/regulator/driver.h> 19 #include <linux/mfd/wm8400-private.h> 20 21 static int wm8400_ldo_is_enabled(struct regulator_dev *dev) 22 { 23 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 24 u16 val; 25 26 val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev)); 27 return (val & WM8400_LDO1_ENA) != 0; 28 } 29 30 static int wm8400_ldo_enable(struct regulator_dev *dev) 31 { 32 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 33 34 return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), 35 WM8400_LDO1_ENA, WM8400_LDO1_ENA); 36 } 37 38 static int wm8400_ldo_disable(struct regulator_dev *dev) 39 { 40 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 41 42 return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), 43 WM8400_LDO1_ENA, 0); 44 } 45 46 static int wm8400_ldo_get_voltage(struct regulator_dev *dev) 47 { 48 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 49 u16 val; 50 51 val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev)); 52 val &= WM8400_LDO1_VSEL_MASK; 53 54 if (val < 15) 55 return 900000 + (val * 50000); 56 else 57 return 1600000 + ((val - 14) * 100000); 58 } 59 60 static int wm8400_ldo_set_voltage(struct regulator_dev *dev, 61 int min_uV, int max_uV) 62 { 63 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 64 u16 val; 65 66 if (min_uV < 900000 || min_uV > 3300000) 67 return -EINVAL; 68 69 if (min_uV < 1700000) { 70 /* Steps of 50mV from 900mV; */ 71 val = (min_uV - 850001) / 50000; 72 73 if ((val * 50000) + 900000 > max_uV) 74 return -EINVAL; 75 BUG_ON((val * 50000) + 900000 < min_uV); 76 } else { 77 /* Steps of 100mV from 1700mV */ 78 val = ((min_uV - 1600001) / 100000); 79 80 if ((val * 100000) + 1700000 > max_uV) 81 return -EINVAL; 82 BUG_ON((val * 100000) + 1700000 < min_uV); 83 84 val += 0xf; 85 } 86 87 return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev), 88 WM8400_LDO1_VSEL_MASK, val); 89 } 90 91 static struct regulator_ops wm8400_ldo_ops = { 92 .is_enabled = wm8400_ldo_is_enabled, 93 .enable = wm8400_ldo_enable, 94 .disable = wm8400_ldo_disable, 95 .get_voltage = wm8400_ldo_get_voltage, 96 .set_voltage = wm8400_ldo_set_voltage, 97 }; 98 99 static int wm8400_dcdc_is_enabled(struct regulator_dev *dev) 100 { 101 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 102 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 103 u16 val; 104 105 val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); 106 return (val & WM8400_DC1_ENA) != 0; 107 } 108 109 static int wm8400_dcdc_enable(struct regulator_dev *dev) 110 { 111 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 112 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 113 114 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 115 WM8400_DC1_ENA, WM8400_DC1_ENA); 116 } 117 118 static int wm8400_dcdc_disable(struct regulator_dev *dev) 119 { 120 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 121 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 122 123 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 124 WM8400_DC1_ENA, 0); 125 } 126 127 static int wm8400_dcdc_get_voltage(struct regulator_dev *dev) 128 { 129 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 130 u16 val; 131 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 132 133 val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset); 134 val &= WM8400_DC1_VSEL_MASK; 135 136 return 850000 + (25000 * val); 137 } 138 139 static int wm8400_dcdc_set_voltage(struct regulator_dev *dev, 140 int min_uV, int max_uV) 141 { 142 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 143 u16 val; 144 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 145 146 if (min_uV < 850000) 147 return -EINVAL; 148 149 val = (min_uV - 825001) / 25000; 150 151 if (850000 + (25000 * val) > max_uV) 152 return -EINVAL; 153 BUG_ON(850000 + (25000 * val) < min_uV); 154 155 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 156 WM8400_DC1_VSEL_MASK, val); 157 } 158 159 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) 160 { 161 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 162 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 163 u16 data[2]; 164 int ret; 165 166 ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, 167 data); 168 if (ret != 0) 169 return 0; 170 171 /* Datasheet: hibernate */ 172 if (data[0] & WM8400_DC1_SLEEP) 173 return REGULATOR_MODE_STANDBY; 174 175 /* Datasheet: standby */ 176 if (!(data[0] & WM8400_DC1_ACTIVE)) 177 return REGULATOR_MODE_IDLE; 178 179 /* Datasheet: active with or without force PWM */ 180 if (data[1] & WM8400_DC1_FRC_PWM) 181 return REGULATOR_MODE_FAST; 182 else 183 return REGULATOR_MODE_NORMAL; 184 } 185 186 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) 187 { 188 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 189 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 190 int ret; 191 192 switch (mode) { 193 case REGULATOR_MODE_FAST: 194 /* Datasheet: active with force PWM */ 195 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 196 WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); 197 if (ret != 0) 198 return ret; 199 200 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 201 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 202 WM8400_DC1_ACTIVE); 203 204 case REGULATOR_MODE_NORMAL: 205 /* Datasheet: active */ 206 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 207 WM8400_DC1_FRC_PWM, 0); 208 if (ret != 0) 209 return ret; 210 211 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 212 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 213 WM8400_DC1_ACTIVE); 214 215 case REGULATOR_MODE_IDLE: 216 /* Datasheet: standby */ 217 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 218 WM8400_DC1_ACTIVE, 0); 219 if (ret != 0) 220 return ret; 221 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 222 WM8400_DC1_SLEEP, 0); 223 224 default: 225 return -EINVAL; 226 } 227 } 228 229 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, 230 int input_uV, int output_uV, 231 int load_uA) 232 { 233 return REGULATOR_MODE_NORMAL; 234 } 235 236 static struct regulator_ops wm8400_dcdc_ops = { 237 .is_enabled = wm8400_dcdc_is_enabled, 238 .enable = wm8400_dcdc_enable, 239 .disable = wm8400_dcdc_disable, 240 .get_voltage = wm8400_dcdc_get_voltage, 241 .set_voltage = wm8400_dcdc_set_voltage, 242 .get_mode = wm8400_dcdc_get_mode, 243 .set_mode = wm8400_dcdc_set_mode, 244 .get_optimum_mode = wm8400_dcdc_get_optimum_mode, 245 }; 246 247 static struct regulator_desc regulators[] = { 248 { 249 .name = "LDO1", 250 .id = WM8400_LDO1, 251 .ops = &wm8400_ldo_ops, 252 .type = REGULATOR_VOLTAGE, 253 .owner = THIS_MODULE, 254 }, 255 { 256 .name = "LDO2", 257 .id = WM8400_LDO2, 258 .ops = &wm8400_ldo_ops, 259 .type = REGULATOR_VOLTAGE, 260 .owner = THIS_MODULE, 261 }, 262 { 263 .name = "LDO3", 264 .id = WM8400_LDO3, 265 .ops = &wm8400_ldo_ops, 266 .type = REGULATOR_VOLTAGE, 267 .owner = THIS_MODULE, 268 }, 269 { 270 .name = "LDO4", 271 .id = WM8400_LDO4, 272 .ops = &wm8400_ldo_ops, 273 .type = REGULATOR_VOLTAGE, 274 .owner = THIS_MODULE, 275 }, 276 { 277 .name = "DCDC1", 278 .id = WM8400_DCDC1, 279 .ops = &wm8400_dcdc_ops, 280 .type = REGULATOR_VOLTAGE, 281 .owner = THIS_MODULE, 282 }, 283 { 284 .name = "DCDC2", 285 .id = WM8400_DCDC2, 286 .ops = &wm8400_dcdc_ops, 287 .type = REGULATOR_VOLTAGE, 288 .owner = THIS_MODULE, 289 }, 290 }; 291 292 static int __devinit wm8400_regulator_probe(struct platform_device *pdev) 293 { 294 struct regulator_dev *rdev; 295 296 rdev = regulator_register(®ulators[pdev->id], &pdev->dev, 297 pdev->dev.driver_data); 298 299 if (IS_ERR(rdev)) 300 return PTR_ERR(rdev); 301 302 return 0; 303 } 304 305 static int __devexit wm8400_regulator_remove(struct platform_device *pdev) 306 { 307 struct regulator_dev *rdev = platform_get_drvdata(pdev); 308 309 regulator_unregister(rdev); 310 311 return 0; 312 } 313 314 static struct platform_driver wm8400_regulator_driver = { 315 .driver = { 316 .name = "wm8400-regulator", 317 }, 318 .probe = wm8400_regulator_probe, 319 .remove = __devexit_p(wm8400_regulator_remove), 320 }; 321 322 /** 323 * wm8400_register_regulator - enable software control of a WM8400 regulator 324 * 325 * This function enables software control of a WM8400 regulator via 326 * the regulator API. It is intended to be called from the 327 * platform_init() callback of the WM8400 MFD driver. 328 * 329 * @param dev The WM8400 device to operate on. 330 * @param reg The regulator to control. 331 * @param initdata Regulator initdata for the regulator. 332 */ 333 int wm8400_register_regulator(struct device *dev, int reg, 334 struct regulator_init_data *initdata) 335 { 336 struct wm8400 *wm8400 = dev->driver_data; 337 338 if (wm8400->regulators[reg].name) 339 return -EBUSY; 340 341 initdata->driver_data = wm8400; 342 343 wm8400->regulators[reg].name = "wm8400-regulator"; 344 wm8400->regulators[reg].id = reg; 345 wm8400->regulators[reg].dev.parent = dev; 346 wm8400->regulators[reg].dev.driver_data = wm8400; 347 wm8400->regulators[reg].dev.platform_data = initdata; 348 349 return platform_device_register(&wm8400->regulators[reg]); 350 } 351 EXPORT_SYMBOL_GPL(wm8400_register_regulator); 352 353 static int __init wm8400_regulator_init(void) 354 { 355 return platform_driver_register(&wm8400_regulator_driver); 356 } 357 module_init(wm8400_regulator_init); 358 359 static void __exit wm8400_regulator_exit(void) 360 { 361 platform_driver_unregister(&wm8400_regulator_driver); 362 } 363 module_exit(wm8400_regulator_exit); 364 365 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 366 MODULE_DESCRIPTION("WM8400 regulator driver"); 367 MODULE_LICENSE("GPL"); 368 MODULE_ALIAS("platform:wm8400-regulator"); 369