1 /* 2 * consumer.h -- SoC Regulator consumer support. 3 * 4 * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC. 5 * 6 * Author: Liam Girdwood <[email protected]> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * Regulator Consumer Interface. 13 * 14 * A Power Management Regulator framework for SoC based devices. 15 * Features:- 16 * o Voltage and current level control. 17 * o Operating mode control. 18 * o Regulator status. 19 * o sysfs entries for showing client devices and status 20 * 21 * EXPERIMENTAL FEATURES: 22 * Dynamic Regulator operating Mode Switching (DRMS) - allows regulators 23 * to use most efficient operating mode depending upon voltage and load and 24 * is transparent to client drivers. 25 * 26 * e.g. Devices x,y,z share regulator r. Device x and y draw 20mA each during 27 * IO and 1mA at idle. Device z draws 100mA when under load and 5mA when 28 * idling. Regulator r has > 90% efficiency in NORMAL mode at loads > 100mA 29 * but this drops rapidly to 60% when below 100mA. Regulator r has > 90% 30 * efficiency in IDLE mode at loads < 10mA. Thus regulator r will operate 31 * in normal mode for loads > 10mA and in IDLE mode for load <= 10mA. 32 * 33 */ 34 35 #ifndef __LINUX_REGULATOR_CONSUMER_H_ 36 #define __LINUX_REGULATOR_CONSUMER_H_ 37 38 struct device; 39 struct notifier_block; 40 41 /* 42 * Regulator operating modes. 43 * 44 * Regulators can run in a variety of different operating modes depending on 45 * output load. This allows further system power savings by selecting the 46 * best (and most efficient) regulator mode for a desired load. 47 * 48 * Most drivers will only care about NORMAL. The modes below are generic and 49 * will probably not match the naming convention of your regulator data sheet 50 * but should match the use cases in the datasheet. 51 * 52 * In order of power efficiency (least efficient at top). 53 * 54 * Mode Description 55 * FAST Regulator can handle fast changes in it's load. 56 * e.g. useful in CPU voltage & frequency scaling where 57 * load can quickly increase with CPU frequency increases. 58 * 59 * NORMAL Normal regulator power supply mode. Most drivers will 60 * use this mode. 61 * 62 * IDLE Regulator runs in a more efficient mode for light 63 * loads. Can be used for devices that have a low power 64 * requirement during periods of inactivity. This mode 65 * may be more noisy than NORMAL and may not be able 66 * to handle fast load switching. 67 * 68 * STANDBY Regulator runs in the most efficient mode for very 69 * light loads. Can be used by devices when they are 70 * in a sleep/standby state. This mode is likely to be 71 * the most noisy and may not be able to handle fast load 72 * switching. 73 * 74 * NOTE: Most regulators will only support a subset of these modes. Some 75 * will only just support NORMAL. 76 * 77 * These modes can be OR'ed together to make up a mask of valid register modes. 78 */ 79 80 #define REGULATOR_MODE_FAST 0x1 81 #define REGULATOR_MODE_NORMAL 0x2 82 #define REGULATOR_MODE_IDLE 0x4 83 #define REGULATOR_MODE_STANDBY 0x8 84 85 /* 86 * Regulator notifier events. 87 * 88 * UNDER_VOLTAGE Regulator output is under voltage. 89 * OVER_CURRENT Regulator output current is too high. 90 * REGULATION_OUT Regulator output is out of regulation. 91 * FAIL Regulator output has failed. 92 * OVER_TEMP Regulator over temp. 93 * FORCE_DISABLE Regulator forcibly shut down by software. 94 * VOLTAGE_CHANGE Regulator voltage changed. 95 * DISABLE Regulator was disabled. 96 * 97 * NOTE: These events can be OR'ed together when passed into handler. 98 */ 99 100 #define REGULATOR_EVENT_UNDER_VOLTAGE 0x01 101 #define REGULATOR_EVENT_OVER_CURRENT 0x02 102 #define REGULATOR_EVENT_REGULATION_OUT 0x04 103 #define REGULATOR_EVENT_FAIL 0x08 104 #define REGULATOR_EVENT_OVER_TEMP 0x10 105 #define REGULATOR_EVENT_FORCE_DISABLE 0x20 106 #define REGULATOR_EVENT_VOLTAGE_CHANGE 0x40 107 #define REGULATOR_EVENT_DISABLE 0x80 108 109 struct regulator; 110 111 /** 112 * struct regulator_bulk_data - Data used for bulk regulator operations. 113 * 114 * @supply: The name of the supply. Initialised by the user before 115 * using the bulk regulator APIs. 116 * @consumer: The regulator consumer for the supply. This will be managed 117 * by the bulk API. 118 * 119 * The regulator APIs provide a series of regulator_bulk_() API calls as 120 * a convenience to consumers which require multiple supplies. This 121 * structure is used to manage data for these calls. 122 */ 123 struct regulator_bulk_data { 124 const char *supply; 125 struct regulator *consumer; 126 127 /* private: Internal use */ 128 int ret; 129 }; 130 131 #if defined(CONFIG_REGULATOR) 132 133 /* regulator get and put */ 134 struct regulator *__must_check regulator_get(struct device *dev, 135 const char *id); 136 struct regulator *__must_check devm_regulator_get(struct device *dev, 137 const char *id); 138 struct regulator *__must_check regulator_get_exclusive(struct device *dev, 139 const char *id); 140 void regulator_put(struct regulator *regulator); 141 void devm_regulator_put(struct regulator *regulator); 142 143 /* regulator output control and status */ 144 int __must_check regulator_enable(struct regulator *regulator); 145 int regulator_disable(struct regulator *regulator); 146 int regulator_force_disable(struct regulator *regulator); 147 int regulator_is_enabled(struct regulator *regulator); 148 int regulator_disable_deferred(struct regulator *regulator, int ms); 149 150 int __must_check regulator_bulk_get(struct device *dev, int num_consumers, 151 struct regulator_bulk_data *consumers); 152 int __must_check devm_regulator_bulk_get(struct device *dev, int num_consumers, 153 struct regulator_bulk_data *consumers); 154 int __must_check regulator_bulk_enable(int num_consumers, 155 struct regulator_bulk_data *consumers); 156 int regulator_bulk_disable(int num_consumers, 157 struct regulator_bulk_data *consumers); 158 int regulator_bulk_force_disable(int num_consumers, 159 struct regulator_bulk_data *consumers); 160 void regulator_bulk_free(int num_consumers, 161 struct regulator_bulk_data *consumers); 162 163 int regulator_can_change_voltage(struct regulator *regulator); 164 int regulator_count_voltages(struct regulator *regulator); 165 int regulator_list_voltage(struct regulator *regulator, unsigned selector); 166 int regulator_is_supported_voltage(struct regulator *regulator, 167 int min_uV, int max_uV); 168 unsigned int regulator_get_linear_step(struct regulator *regulator); 169 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV); 170 int regulator_set_voltage_time(struct regulator *regulator, 171 int old_uV, int new_uV); 172 int regulator_get_voltage(struct regulator *regulator); 173 int regulator_sync_voltage(struct regulator *regulator); 174 int regulator_set_current_limit(struct regulator *regulator, 175 int min_uA, int max_uA); 176 int regulator_get_current_limit(struct regulator *regulator); 177 178 int regulator_set_mode(struct regulator *regulator, unsigned int mode); 179 unsigned int regulator_get_mode(struct regulator *regulator); 180 int regulator_set_optimum_mode(struct regulator *regulator, int load_uA); 181 182 int regulator_allow_bypass(struct regulator *regulator, bool allow); 183 184 /* regulator notifier block */ 185 int regulator_register_notifier(struct regulator *regulator, 186 struct notifier_block *nb); 187 int regulator_unregister_notifier(struct regulator *regulator, 188 struct notifier_block *nb); 189 190 /* driver data - core doesn't touch */ 191 void *regulator_get_drvdata(struct regulator *regulator); 192 void regulator_set_drvdata(struct regulator *regulator, void *data); 193 194 #else 195 196 /* 197 * Make sure client drivers will still build on systems with no software 198 * controllable voltage or current regulators. 199 */ 200 static inline struct regulator *__must_check regulator_get(struct device *dev, 201 const char *id) 202 { 203 /* Nothing except the stubbed out regulator API should be 204 * looking at the value except to check if it is an error 205 * value. Drivers are free to handle NULL specifically by 206 * skipping all regulator API calls, but they don't have to. 207 * Drivers which don't, should make sure they properly handle 208 * corner cases of the API, such as regulator_get_voltage() 209 * returning 0. 210 */ 211 return NULL; 212 } 213 214 static inline struct regulator *__must_check 215 devm_regulator_get(struct device *dev, const char *id) 216 { 217 return NULL; 218 } 219 220 static inline void regulator_put(struct regulator *regulator) 221 { 222 } 223 224 static inline void devm_regulator_put(struct regulator *regulator) 225 { 226 } 227 228 static inline int regulator_enable(struct regulator *regulator) 229 { 230 return 0; 231 } 232 233 static inline int regulator_disable(struct regulator *regulator) 234 { 235 return 0; 236 } 237 238 static inline int regulator_force_disable(struct regulator *regulator) 239 { 240 return 0; 241 } 242 243 static inline int regulator_disable_deferred(struct regulator *regulator, 244 int ms) 245 { 246 return 0; 247 } 248 249 static inline int regulator_is_enabled(struct regulator *regulator) 250 { 251 return 1; 252 } 253 254 static inline int regulator_bulk_get(struct device *dev, 255 int num_consumers, 256 struct regulator_bulk_data *consumers) 257 { 258 return 0; 259 } 260 261 static inline int devm_regulator_bulk_get(struct device *dev, int num_consumers, 262 struct regulator_bulk_data *consumers) 263 { 264 return 0; 265 } 266 267 static inline int regulator_bulk_enable(int num_consumers, 268 struct regulator_bulk_data *consumers) 269 { 270 return 0; 271 } 272 273 static inline int regulator_bulk_disable(int num_consumers, 274 struct regulator_bulk_data *consumers) 275 { 276 return 0; 277 } 278 279 static inline int regulator_bulk_force_disable(int num_consumers, 280 struct regulator_bulk_data *consumers) 281 { 282 return 0; 283 } 284 285 static inline void regulator_bulk_free(int num_consumers, 286 struct regulator_bulk_data *consumers) 287 { 288 } 289 290 static inline int regulator_set_voltage(struct regulator *regulator, 291 int min_uV, int max_uV) 292 { 293 return 0; 294 } 295 296 static inline int regulator_get_voltage(struct regulator *regulator) 297 { 298 return -EINVAL; 299 } 300 301 static inline int regulator_is_supported_voltage(struct regulator *regulator, 302 int min_uV, int max_uV) 303 { 304 return 0; 305 } 306 307 static inline int regulator_set_current_limit(struct regulator *regulator, 308 int min_uA, int max_uA) 309 { 310 return 0; 311 } 312 313 static inline int regulator_get_current_limit(struct regulator *regulator) 314 { 315 return 0; 316 } 317 318 static inline int regulator_set_mode(struct regulator *regulator, 319 unsigned int mode) 320 { 321 return 0; 322 } 323 324 static inline unsigned int regulator_get_mode(struct regulator *regulator) 325 { 326 return REGULATOR_MODE_NORMAL; 327 } 328 329 static inline int regulator_set_optimum_mode(struct regulator *regulator, 330 int load_uA) 331 { 332 return REGULATOR_MODE_NORMAL; 333 } 334 335 static inline int regulator_allow_bypass(struct regulator *regulator, 336 bool allow) 337 { 338 return 0; 339 } 340 341 static inline int regulator_register_notifier(struct regulator *regulator, 342 struct notifier_block *nb) 343 { 344 return 0; 345 } 346 347 static inline int regulator_unregister_notifier(struct regulator *regulator, 348 struct notifier_block *nb) 349 { 350 return 0; 351 } 352 353 static inline void *regulator_get_drvdata(struct regulator *regulator) 354 { 355 return NULL; 356 } 357 358 static inline void regulator_set_drvdata(struct regulator *regulator, 359 void *data) 360 { 361 } 362 363 static inline int regulator_count_voltages(struct regulator *regulator) 364 { 365 return 0; 366 } 367 #endif 368 369 static inline int regulator_set_voltage_tol(struct regulator *regulator, 370 int new_uV, int tol_uV) 371 { 372 return regulator_set_voltage(regulator, 373 new_uV - tol_uV, new_uV + tol_uV); 374 } 375 376 static inline int regulator_is_supported_voltage_tol(struct regulator *regulator, 377 int target_uV, int tol_uV) 378 { 379 return regulator_is_supported_voltage(regulator, 380 target_uV - tol_uV, 381 target_uV + tol_uV); 382 } 383 384 #endif 385