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 1600000 + ((selector - 14) * 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 39 if (min_uV < 900000 || min_uV > 3300000) 40 return -EINVAL; 41 42 if (min_uV < 1700000) { 43 /* Steps of 50mV from 900mV; */ 44 val = DIV_ROUND_UP(min_uV - 900000, 50000); 45 46 if ((val * 50000) + 900000 > max_uV) 47 return -EINVAL; 48 BUG_ON((val * 50000) + 900000 < min_uV); 49 } else { 50 /* Steps of 100mV from 1700mV */ 51 val = DIV_ROUND_UP(min_uV - 1700000, 100000); 52 53 if ((val * 100000) + 1700000 > max_uV) 54 return -EINVAL; 55 BUG_ON((val * 100000) + 1700000 < min_uV); 56 57 val += 0xf; 58 } 59 60 return val; 61 } 62 63 static struct regulator_ops wm8400_ldo_ops = { 64 .is_enabled = regulator_is_enabled_regmap, 65 .enable = regulator_enable_regmap, 66 .disable = regulator_disable_regmap, 67 .list_voltage = wm8400_ldo_list_voltage, 68 .get_voltage_sel = regulator_get_voltage_sel_regmap, 69 .set_voltage_sel = regulator_set_voltage_sel_regmap, 70 .map_voltage = wm8400_ldo_map_voltage, 71 }; 72 73 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev) 74 { 75 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 76 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 77 u16 data[2]; 78 int ret; 79 80 ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2, 81 data); 82 if (ret != 0) 83 return 0; 84 85 /* Datasheet: hibernate */ 86 if (data[0] & WM8400_DC1_SLEEP) 87 return REGULATOR_MODE_STANDBY; 88 89 /* Datasheet: standby */ 90 if (!(data[0] & WM8400_DC1_ACTIVE)) 91 return REGULATOR_MODE_IDLE; 92 93 /* Datasheet: active with or without force PWM */ 94 if (data[1] & WM8400_DC1_FRC_PWM) 95 return REGULATOR_MODE_FAST; 96 else 97 return REGULATOR_MODE_NORMAL; 98 } 99 100 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode) 101 { 102 struct wm8400 *wm8400 = rdev_get_drvdata(dev); 103 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2; 104 int ret; 105 106 switch (mode) { 107 case REGULATOR_MODE_FAST: 108 /* Datasheet: active with force PWM */ 109 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 110 WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM); 111 if (ret != 0) 112 return ret; 113 114 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 115 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 116 WM8400_DC1_ACTIVE); 117 118 case REGULATOR_MODE_NORMAL: 119 /* Datasheet: active */ 120 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset, 121 WM8400_DC1_FRC_PWM, 0); 122 if (ret != 0) 123 return ret; 124 125 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 126 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 127 WM8400_DC1_ACTIVE); 128 129 case REGULATOR_MODE_IDLE: 130 /* Datasheet: standby */ 131 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 132 WM8400_DC1_ACTIVE, 0); 133 if (ret != 0) 134 return ret; 135 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 136 WM8400_DC1_SLEEP, 0); 137 138 default: 139 return -EINVAL; 140 } 141 } 142 143 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev, 144 int input_uV, int output_uV, 145 int load_uA) 146 { 147 return REGULATOR_MODE_NORMAL; 148 } 149 150 static struct regulator_ops wm8400_dcdc_ops = { 151 .is_enabled = regulator_is_enabled_regmap, 152 .enable = regulator_enable_regmap, 153 .disable = regulator_disable_regmap, 154 .list_voltage = regulator_list_voltage_linear, 155 .get_voltage_sel = regulator_get_voltage_sel_regmap, 156 .set_voltage_sel = regulator_set_voltage_sel_regmap, 157 .get_mode = wm8400_dcdc_get_mode, 158 .set_mode = wm8400_dcdc_set_mode, 159 .get_optimum_mode = wm8400_dcdc_get_optimum_mode, 160 }; 161 162 static struct regulator_desc regulators[] = { 163 { 164 .name = "LDO1", 165 .id = WM8400_LDO1, 166 .ops = &wm8400_ldo_ops, 167 .enable_reg = WM8400_LDO1_CONTROL, 168 .enable_mask = WM8400_LDO1_ENA, 169 .n_voltages = WM8400_LDO1_VSEL_MASK + 1, 170 .vsel_reg = WM8400_LDO1_CONTROL, 171 .vsel_mask = WM8400_LDO1_VSEL_MASK, 172 .type = REGULATOR_VOLTAGE, 173 .owner = THIS_MODULE, 174 }, 175 { 176 .name = "LDO2", 177 .id = WM8400_LDO2, 178 .ops = &wm8400_ldo_ops, 179 .enable_reg = WM8400_LDO2_CONTROL, 180 .enable_mask = WM8400_LDO2_ENA, 181 .n_voltages = WM8400_LDO2_VSEL_MASK + 1, 182 .type = REGULATOR_VOLTAGE, 183 .vsel_reg = WM8400_LDO2_CONTROL, 184 .vsel_mask = WM8400_LDO2_VSEL_MASK, 185 .owner = THIS_MODULE, 186 }, 187 { 188 .name = "LDO3", 189 .id = WM8400_LDO3, 190 .ops = &wm8400_ldo_ops, 191 .enable_reg = WM8400_LDO3_CONTROL, 192 .enable_mask = WM8400_LDO3_ENA, 193 .n_voltages = WM8400_LDO3_VSEL_MASK + 1, 194 .vsel_reg = WM8400_LDO3_CONTROL, 195 .vsel_mask = WM8400_LDO3_VSEL_MASK, 196 .type = REGULATOR_VOLTAGE, 197 .owner = THIS_MODULE, 198 }, 199 { 200 .name = "LDO4", 201 .id = WM8400_LDO4, 202 .ops = &wm8400_ldo_ops, 203 .enable_reg = WM8400_LDO4_CONTROL, 204 .enable_mask = WM8400_LDO4_ENA, 205 .n_voltages = WM8400_LDO4_VSEL_MASK + 1, 206 .vsel_reg = WM8400_LDO4_CONTROL, 207 .vsel_mask = WM8400_LDO4_VSEL_MASK, 208 .type = REGULATOR_VOLTAGE, 209 .owner = THIS_MODULE, 210 }, 211 { 212 .name = "DCDC1", 213 .id = WM8400_DCDC1, 214 .ops = &wm8400_dcdc_ops, 215 .enable_reg = WM8400_DCDC1_CONTROL_1, 216 .enable_mask = WM8400_DC1_ENA_MASK, 217 .n_voltages = WM8400_DC1_VSEL_MASK + 1, 218 .vsel_reg = WM8400_DCDC1_CONTROL_1, 219 .vsel_mask = WM8400_DC1_VSEL_MASK, 220 .min_uV = 850000, 221 .uV_step = 25000, 222 .type = REGULATOR_VOLTAGE, 223 .owner = THIS_MODULE, 224 }, 225 { 226 .name = "DCDC2", 227 .id = WM8400_DCDC2, 228 .ops = &wm8400_dcdc_ops, 229 .enable_reg = WM8400_DCDC2_CONTROL_1, 230 .enable_mask = WM8400_DC1_ENA_MASK, 231 .n_voltages = WM8400_DC2_VSEL_MASK + 1, 232 .vsel_reg = WM8400_DCDC2_CONTROL_1, 233 .vsel_mask = WM8400_DC2_VSEL_MASK, 234 .min_uV = 850000, 235 .uV_step = 25000, 236 .type = REGULATOR_VOLTAGE, 237 .owner = THIS_MODULE, 238 }, 239 }; 240 241 static int __devinit wm8400_regulator_probe(struct platform_device *pdev) 242 { 243 struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]); 244 struct regulator_config config = { }; 245 struct regulator_dev *rdev; 246 247 config.dev = &pdev->dev; 248 config.init_data = pdev->dev.platform_data; 249 config.driver_data = wm8400; 250 config.regmap = wm8400->regmap; 251 252 rdev = regulator_register(®ulators[pdev->id], &config); 253 if (IS_ERR(rdev)) 254 return PTR_ERR(rdev); 255 256 platform_set_drvdata(pdev, rdev); 257 258 return 0; 259 } 260 261 static int __devexit wm8400_regulator_remove(struct platform_device *pdev) 262 { 263 struct regulator_dev *rdev = platform_get_drvdata(pdev); 264 265 platform_set_drvdata(pdev, NULL); 266 regulator_unregister(rdev); 267 268 return 0; 269 } 270 271 static struct platform_driver wm8400_regulator_driver = { 272 .driver = { 273 .name = "wm8400-regulator", 274 }, 275 .probe = wm8400_regulator_probe, 276 .remove = __devexit_p(wm8400_regulator_remove), 277 }; 278 279 /** 280 * wm8400_register_regulator - enable software control of a WM8400 regulator 281 * 282 * This function enables software control of a WM8400 regulator via 283 * the regulator API. It is intended to be called from the 284 * platform_init() callback of the WM8400 MFD driver. 285 * 286 * @param dev The WM8400 device to operate on. 287 * @param reg The regulator to control. 288 * @param initdata Regulator initdata for the regulator. 289 */ 290 int wm8400_register_regulator(struct device *dev, int reg, 291 struct regulator_init_data *initdata) 292 { 293 struct wm8400 *wm8400 = dev_get_drvdata(dev); 294 295 if (wm8400->regulators[reg].name) 296 return -EBUSY; 297 298 initdata->driver_data = wm8400; 299 300 wm8400->regulators[reg].name = "wm8400-regulator"; 301 wm8400->regulators[reg].id = reg; 302 wm8400->regulators[reg].dev.parent = dev; 303 wm8400->regulators[reg].dev.platform_data = initdata; 304 305 return platform_device_register(&wm8400->regulators[reg]); 306 } 307 EXPORT_SYMBOL_GPL(wm8400_register_regulator); 308 309 static int __init wm8400_regulator_init(void) 310 { 311 return platform_driver_register(&wm8400_regulator_driver); 312 } 313 subsys_initcall(wm8400_regulator_init); 314 315 static void __exit wm8400_regulator_exit(void) 316 { 317 platform_driver_unregister(&wm8400_regulator_driver); 318 } 319 module_exit(wm8400_regulator_exit); 320 321 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 322 MODULE_DESCRIPTION("WM8400 regulator driver"); 323 MODULE_LICENSE("GPL"); 324 MODULE_ALIAS("platform:wm8400-regulator"); 325