Mark Brown | 42fad57 | 2008-09-11 11:12:01 +0100 | [diff] [blame] | 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 | |
Uwe Kleine-König | 5dbdf73 | 2009-01-12 23:25:05 +0100 | [diff] [blame] | 292 | static int __devinit wm8400_regulator_probe(struct platform_device *pdev) |
Mark Brown | 42fad57 | 2008-09-11 11:12:01 +0100 | [diff] [blame] | 293 | { |
| 294 | struct regulator_dev *rdev; |
| 295 | |
| 296 | rdev = regulator_register(®ulators[pdev->id], &pdev->dev, |
Mark Brown | 0527100 | 2009-01-19 13:37:02 +0000 | [diff] [blame^] | 297 | pdev->dev.platform_data, pdev->dev.driver_data); |
Mark Brown | 42fad57 | 2008-09-11 11:12:01 +0100 | [diff] [blame] | 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"); |