1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * consumer.h -- SoC Regulator consumer support. 4 * 5 * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * Regulator Consumer Interface. 10 * 11 * A Power Management Regulator framework for SoC based devices. 12 * Features:- 13 * o Voltage and current level control. 14 * o Operating mode control. 15 * o Regulator status. 16 * o sysfs entries for showing client devices and status 17 * 18 * EXPERIMENTAL FEATURES: 19 * Dynamic Regulator operating Mode Switching (DRMS) - allows regulators 20 * to use most efficient operating mode depending upon voltage and load and 21 * is transparent to client drivers. 22 * 23 * e.g. Devices x,y,z share regulator r. Device x and y draw 20mA each during 24 * IO and 1mA at idle. Device z draws 100mA when under load and 5mA when 25 * idling. Regulator r has > 90% efficiency in NORMAL mode at loads > 100mA 26 * but this drops rapidly to 60% when below 100mA. Regulator r has > 90% 27 * efficiency in IDLE mode at loads < 10mA. Thus regulator r will operate 28 * in normal mode for loads > 10mA and in IDLE mode for load <= 10mA. 29 */ 30 31 #ifndef __LINUX_REGULATOR_CONSUMER_H_ 32 #define __LINUX_REGULATOR_CONSUMER_H_ 33 34 #include <linux/err.h> 35 #include <linux/suspend.h> 36 37 struct device; 38 struct notifier_block; 39 struct regmap; 40 struct regulator_dev; 41 42 /* 43 * Regulator operating modes. 44 * 45 * Regulators can run in a variety of different operating modes depending on 46 * output load. This allows further system power savings by selecting the 47 * best (and most efficient) regulator mode for a desired load. 48 * 49 * Most drivers will only care about NORMAL. The modes below are generic and 50 * will probably not match the naming convention of your regulator data sheet 51 * but should match the use cases in the datasheet. 52 * 53 * In order of power efficiency (least efficient at top). 54 * 55 * Mode Description 56 * FAST Regulator can handle fast changes in it's load. 57 * e.g. useful in CPU voltage & frequency scaling where 58 * load can quickly increase with CPU frequency increases. 59 * 60 * NORMAL Normal regulator power supply mode. Most drivers will 61 * use this mode. 62 * 63 * IDLE Regulator runs in a more efficient mode for light 64 * loads. Can be used for devices that have a low power 65 * requirement during periods of inactivity. This mode 66 * may be more noisy than NORMAL and may not be able 67 * to handle fast load switching. 68 * 69 * STANDBY Regulator runs in the most efficient mode for very 70 * light loads. Can be used by devices when they are 71 * in a sleep/standby state. This mode is likely to be 72 * the most noisy and may not be able to handle fast load 73 * switching. 74 * 75 * NOTE: Most regulators will only support a subset of these modes. Some 76 * will only just support NORMAL. 77 * 78 * These modes can be OR'ed together to make up a mask of valid register modes. 79 */ 80 81 #define REGULATOR_MODE_INVALID 0x0 82 #define REGULATOR_MODE_FAST 0x1 83 #define REGULATOR_MODE_NORMAL 0x2 84 #define REGULATOR_MODE_IDLE 0x4 85 #define REGULATOR_MODE_STANDBY 0x8 86 87 /* 88 * Regulator notifier events. 89 * 90 * UNDER_VOLTAGE Regulator output is under voltage. 91 * OVER_CURRENT Regulator output current is too high. 92 * REGULATION_OUT Regulator output is out of regulation. 93 * FAIL Regulator output has failed. 94 * OVER_TEMP Regulator over temp. 95 * FORCE_DISABLE Regulator forcibly shut down by software. 96 * VOLTAGE_CHANGE Regulator voltage changed. 97 * Data passed is old voltage cast to (void *). 98 * DISABLE Regulator was disabled. 99 * PRE_VOLTAGE_CHANGE Regulator is about to have voltage changed. 100 * Data passed is "struct pre_voltage_change_data" 101 * ABORT_VOLTAGE_CHANGE Regulator voltage change failed for some reason. 102 * Data passed is old voltage cast to (void *). 103 * PRE_DISABLE Regulator is about to be disabled 104 * ABORT_DISABLE Regulator disable failed for some reason 105 * 106 * NOTE: These events can be OR'ed together when passed into handler. 107 */ 108 109 #define REGULATOR_EVENT_UNDER_VOLTAGE 0x01 110 #define REGULATOR_EVENT_OVER_CURRENT 0x02 111 #define REGULATOR_EVENT_REGULATION_OUT 0x04 112 #define REGULATOR_EVENT_FAIL 0x08 113 #define REGULATOR_EVENT_OVER_TEMP 0x10 114 #define REGULATOR_EVENT_FORCE_DISABLE 0x20 115 #define REGULATOR_EVENT_VOLTAGE_CHANGE 0x40 116 #define REGULATOR_EVENT_DISABLE 0x80 117 #define REGULATOR_EVENT_PRE_VOLTAGE_CHANGE 0x100 118 #define REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE 0x200 119 #define REGULATOR_EVENT_PRE_DISABLE 0x400 120 #define REGULATOR_EVENT_ABORT_DISABLE 0x800 121 #define REGULATOR_EVENT_ENABLE 0x1000 122 /* 123 * Following notifications should be emitted only if detected condition 124 * is such that the HW is likely to still be working but consumers should 125 * take a recovery action to prevent problems esacalating into errors. 126 */ 127 #define REGULATOR_EVENT_UNDER_VOLTAGE_WARN 0x2000 128 #define REGULATOR_EVENT_OVER_CURRENT_WARN 0x4000 129 #define REGULATOR_EVENT_OVER_VOLTAGE_WARN 0x8000 130 #define REGULATOR_EVENT_OVER_TEMP_WARN 0x10000 131 #define REGULATOR_EVENT_WARN_MASK 0x1E000 132 133 /* 134 * Regulator errors that can be queried using regulator_get_error_flags 135 * 136 * UNDER_VOLTAGE Regulator output is under voltage. 137 * OVER_CURRENT Regulator output current is too high. 138 * REGULATION_OUT Regulator output is out of regulation. 139 * FAIL Regulator output has failed. 140 * OVER_TEMP Regulator over temp. 141 * 142 * NOTE: These errors can be OR'ed together. 143 */ 144 145 #define REGULATOR_ERROR_UNDER_VOLTAGE BIT(1) 146 #define REGULATOR_ERROR_OVER_CURRENT BIT(2) 147 #define REGULATOR_ERROR_REGULATION_OUT BIT(3) 148 #define REGULATOR_ERROR_FAIL BIT(4) 149 #define REGULATOR_ERROR_OVER_TEMP BIT(5) 150 151 #define REGULATOR_ERROR_UNDER_VOLTAGE_WARN BIT(6) 152 #define REGULATOR_ERROR_OVER_CURRENT_WARN BIT(7) 153 #define REGULATOR_ERROR_OVER_VOLTAGE_WARN BIT(8) 154 #define REGULATOR_ERROR_OVER_TEMP_WARN BIT(9) 155 156 /** 157 * struct pre_voltage_change_data - Data sent with PRE_VOLTAGE_CHANGE event 158 * 159 * @old_uV: Current voltage before change. 160 * @min_uV: Min voltage we'll change to. 161 * @max_uV: Max voltage we'll change to. 162 */ 163 struct pre_voltage_change_data { 164 unsigned long old_uV; 165 unsigned long min_uV; 166 unsigned long max_uV; 167 }; 168 169 struct regulator; 170 171 /** 172 * struct regulator_bulk_data - Data used for bulk regulator operations. 173 * 174 * @supply: The name of the supply. Initialised by the user before 175 * using the bulk regulator APIs. 176 * @consumer: The regulator consumer for the supply. This will be managed 177 * by the bulk API. 178 * 179 * The regulator APIs provide a series of regulator_bulk_() API calls as 180 * a convenience to consumers which require multiple supplies. This 181 * structure is used to manage data for these calls. 182 */ 183 struct regulator_bulk_data { 184 const char *supply; 185 struct regulator *consumer; 186 187 /* private: Internal use */ 188 int ret; 189 }; 190 191 #if defined(CONFIG_REGULATOR) 192 193 /* regulator get and put */ 194 struct regulator *__must_check regulator_get(struct device *dev, 195 const char *id); 196 struct regulator *__must_check devm_regulator_get(struct device *dev, 197 const char *id); 198 struct regulator *__must_check regulator_get_exclusive(struct device *dev, 199 const char *id); 200 struct regulator *__must_check devm_regulator_get_exclusive(struct device *dev, 201 const char *id); 202 struct regulator *__must_check regulator_get_optional(struct device *dev, 203 const char *id); 204 struct regulator *__must_check devm_regulator_get_optional(struct device *dev, 205 const char *id); 206 void regulator_put(struct regulator *regulator); 207 void devm_regulator_put(struct regulator *regulator); 208 209 int regulator_register_supply_alias(struct device *dev, const char *id, 210 struct device *alias_dev, 211 const char *alias_id); 212 void regulator_unregister_supply_alias(struct device *dev, const char *id); 213 214 int regulator_bulk_register_supply_alias(struct device *dev, 215 const char *const *id, 216 struct device *alias_dev, 217 const char *const *alias_id, 218 int num_id); 219 void regulator_bulk_unregister_supply_alias(struct device *dev, 220 const char * const *id, int num_id); 221 222 int devm_regulator_register_supply_alias(struct device *dev, const char *id, 223 struct device *alias_dev, 224 const char *alias_id); 225 226 int devm_regulator_bulk_register_supply_alias(struct device *dev, 227 const char *const *id, 228 struct device *alias_dev, 229 const char *const *alias_id, 230 int num_id); 231 232 /* regulator output control and status */ 233 int __must_check regulator_enable(struct regulator *regulator); 234 int regulator_disable(struct regulator *regulator); 235 int regulator_force_disable(struct regulator *regulator); 236 int regulator_is_enabled(struct regulator *regulator); 237 int regulator_disable_deferred(struct regulator *regulator, int ms); 238 239 int __must_check regulator_bulk_get(struct device *dev, int num_consumers, 240 struct regulator_bulk_data *consumers); 241 int __must_check devm_regulator_bulk_get(struct device *dev, int num_consumers, 242 struct regulator_bulk_data *consumers); 243 int __must_check regulator_bulk_enable(int num_consumers, 244 struct regulator_bulk_data *consumers); 245 int regulator_bulk_disable(int num_consumers, 246 struct regulator_bulk_data *consumers); 247 int regulator_bulk_force_disable(int num_consumers, 248 struct regulator_bulk_data *consumers); 249 void regulator_bulk_free(int num_consumers, 250 struct regulator_bulk_data *consumers); 251 252 int regulator_count_voltages(struct regulator *regulator); 253 int regulator_list_voltage(struct regulator *regulator, unsigned selector); 254 int regulator_is_supported_voltage(struct regulator *regulator, 255 int min_uV, int max_uV); 256 unsigned int regulator_get_linear_step(struct regulator *regulator); 257 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV); 258 int regulator_set_voltage_time(struct regulator *regulator, 259 int old_uV, int new_uV); 260 int regulator_get_voltage(struct regulator *regulator); 261 int regulator_sync_voltage(struct regulator *regulator); 262 int regulator_set_current_limit(struct regulator *regulator, 263 int min_uA, int max_uA); 264 int regulator_get_current_limit(struct regulator *regulator); 265 266 int regulator_set_mode(struct regulator *regulator, unsigned int mode); 267 unsigned int regulator_get_mode(struct regulator *regulator); 268 int regulator_get_error_flags(struct regulator *regulator, 269 unsigned int *flags); 270 int regulator_set_load(struct regulator *regulator, int load_uA); 271 272 int regulator_allow_bypass(struct regulator *regulator, bool allow); 273 274 struct regmap *regulator_get_regmap(struct regulator *regulator); 275 int regulator_get_hardware_vsel_register(struct regulator *regulator, 276 unsigned *vsel_reg, 277 unsigned *vsel_mask); 278 int regulator_list_hardware_vsel(struct regulator *regulator, 279 unsigned selector); 280 281 /* regulator notifier block */ 282 int regulator_register_notifier(struct regulator *regulator, 283 struct notifier_block *nb); 284 int devm_regulator_register_notifier(struct regulator *regulator, 285 struct notifier_block *nb); 286 int regulator_unregister_notifier(struct regulator *regulator, 287 struct notifier_block *nb); 288 void devm_regulator_unregister_notifier(struct regulator *regulator, 289 struct notifier_block *nb); 290 291 /* regulator suspend */ 292 int regulator_suspend_enable(struct regulator_dev *rdev, 293 suspend_state_t state); 294 int regulator_suspend_disable(struct regulator_dev *rdev, 295 suspend_state_t state); 296 int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV, 297 int max_uV, suspend_state_t state); 298 299 /* driver data - core doesn't touch */ 300 void *regulator_get_drvdata(struct regulator *regulator); 301 void regulator_set_drvdata(struct regulator *regulator, void *data); 302 303 /* misc helpers */ 304 305 void regulator_bulk_set_supply_names(struct regulator_bulk_data *consumers, 306 const char *const *supply_names, 307 unsigned int num_supplies); 308 309 bool regulator_is_equal(struct regulator *reg1, struct regulator *reg2); 310 311 #else 312 313 /* 314 * Make sure client drivers will still build on systems with no software 315 * controllable voltage or current regulators. 316 */ 317 static inline struct regulator *__must_check regulator_get(struct device *dev, 318 const char *id) 319 { 320 /* Nothing except the stubbed out regulator API should be 321 * looking at the value except to check if it is an error 322 * value. Drivers are free to handle NULL specifically by 323 * skipping all regulator API calls, but they don't have to. 324 * Drivers which don't, should make sure they properly handle 325 * corner cases of the API, such as regulator_get_voltage() 326 * returning 0. 327 */ 328 return NULL; 329 } 330 331 static inline struct regulator *__must_check 332 devm_regulator_get(struct device *dev, const char *id) 333 { 334 return NULL; 335 } 336 337 static inline struct regulator *__must_check 338 regulator_get_exclusive(struct device *dev, const char *id) 339 { 340 return ERR_PTR(-ENODEV); 341 } 342 343 static inline struct regulator *__must_check 344 devm_regulator_get_exclusive(struct device *dev, const char *id) 345 { 346 return ERR_PTR(-ENODEV); 347 } 348 349 static inline struct regulator *__must_check 350 regulator_get_optional(struct device *dev, const char *id) 351 { 352 return ERR_PTR(-ENODEV); 353 } 354 355 356 static inline struct regulator *__must_check 357 devm_regulator_get_optional(struct device *dev, const char *id) 358 { 359 return ERR_PTR(-ENODEV); 360 } 361 362 static inline void regulator_put(struct regulator *regulator) 363 { 364 } 365 366 static inline void devm_regulator_put(struct regulator *regulator) 367 { 368 } 369 370 static inline int regulator_register_supply_alias(struct device *dev, 371 const char *id, 372 struct device *alias_dev, 373 const char *alias_id) 374 { 375 return 0; 376 } 377 378 static inline void regulator_unregister_supply_alias(struct device *dev, 379 const char *id) 380 { 381 } 382 383 static inline int regulator_bulk_register_supply_alias(struct device *dev, 384 const char *const *id, 385 struct device *alias_dev, 386 const char * const *alias_id, 387 int num_id) 388 { 389 return 0; 390 } 391 392 static inline void regulator_bulk_unregister_supply_alias(struct device *dev, 393 const char * const *id, 394 int num_id) 395 { 396 } 397 398 static inline int devm_regulator_register_supply_alias(struct device *dev, 399 const char *id, 400 struct device *alias_dev, 401 const char *alias_id) 402 { 403 return 0; 404 } 405 406 static inline int devm_regulator_bulk_register_supply_alias(struct device *dev, 407 const char *const *id, 408 struct device *alias_dev, 409 const char *const *alias_id, 410 int num_id) 411 { 412 return 0; 413 } 414 415 static inline int regulator_enable(struct regulator *regulator) 416 { 417 return 0; 418 } 419 420 static inline int regulator_disable(struct regulator *regulator) 421 { 422 return 0; 423 } 424 425 static inline int regulator_force_disable(struct regulator *regulator) 426 { 427 return 0; 428 } 429 430 static inline int regulator_disable_deferred(struct regulator *regulator, 431 int ms) 432 { 433 return 0; 434 } 435 436 static inline int regulator_is_enabled(struct regulator *regulator) 437 { 438 return 1; 439 } 440 441 static inline int regulator_bulk_get(struct device *dev, 442 int num_consumers, 443 struct regulator_bulk_data *consumers) 444 { 445 return 0; 446 } 447 448 static inline int devm_regulator_bulk_get(struct device *dev, int num_consumers, 449 struct regulator_bulk_data *consumers) 450 { 451 return 0; 452 } 453 454 static inline int regulator_bulk_enable(int num_consumers, 455 struct regulator_bulk_data *consumers) 456 { 457 return 0; 458 } 459 460 static inline int regulator_bulk_disable(int num_consumers, 461 struct regulator_bulk_data *consumers) 462 { 463 return 0; 464 } 465 466 static inline int regulator_bulk_force_disable(int num_consumers, 467 struct regulator_bulk_data *consumers) 468 { 469 return 0; 470 } 471 472 static inline void regulator_bulk_free(int num_consumers, 473 struct regulator_bulk_data *consumers) 474 { 475 } 476 477 static inline int regulator_set_voltage(struct regulator *regulator, 478 int min_uV, int max_uV) 479 { 480 return 0; 481 } 482 483 static inline int regulator_set_voltage_time(struct regulator *regulator, 484 int old_uV, int new_uV) 485 { 486 return 0; 487 } 488 489 static inline int regulator_get_voltage(struct regulator *regulator) 490 { 491 return -EINVAL; 492 } 493 494 static inline int regulator_sync_voltage(struct regulator *regulator) 495 { 496 return -EINVAL; 497 } 498 499 static inline int regulator_is_supported_voltage(struct regulator *regulator, 500 int min_uV, int max_uV) 501 { 502 return 0; 503 } 504 505 static inline unsigned int regulator_get_linear_step(struct regulator *regulator) 506 { 507 return 0; 508 } 509 510 static inline int regulator_set_current_limit(struct regulator *regulator, 511 int min_uA, int max_uA) 512 { 513 return 0; 514 } 515 516 static inline int regulator_get_current_limit(struct regulator *regulator) 517 { 518 return 0; 519 } 520 521 static inline int regulator_set_mode(struct regulator *regulator, 522 unsigned int mode) 523 { 524 return 0; 525 } 526 527 static inline unsigned int regulator_get_mode(struct regulator *regulator) 528 { 529 return REGULATOR_MODE_NORMAL; 530 } 531 532 static inline int regulator_get_error_flags(struct regulator *regulator, 533 unsigned int *flags) 534 { 535 return -EINVAL; 536 } 537 538 static inline int regulator_set_load(struct regulator *regulator, int load_uA) 539 { 540 return 0; 541 } 542 543 static inline int regulator_allow_bypass(struct regulator *regulator, 544 bool allow) 545 { 546 return 0; 547 } 548 549 static inline struct regmap *regulator_get_regmap(struct regulator *regulator) 550 { 551 return ERR_PTR(-EOPNOTSUPP); 552 } 553 554 static inline int regulator_get_hardware_vsel_register(struct regulator *regulator, 555 unsigned *vsel_reg, 556 unsigned *vsel_mask) 557 { 558 return -EOPNOTSUPP; 559 } 560 561 static inline int regulator_list_hardware_vsel(struct regulator *regulator, 562 unsigned selector) 563 { 564 return -EOPNOTSUPP; 565 } 566 567 static inline int regulator_register_notifier(struct regulator *regulator, 568 struct notifier_block *nb) 569 { 570 return 0; 571 } 572 573 static inline int devm_regulator_register_notifier(struct regulator *regulator, 574 struct notifier_block *nb) 575 { 576 return 0; 577 } 578 579 static inline int regulator_unregister_notifier(struct regulator *regulator, 580 struct notifier_block *nb) 581 { 582 return 0; 583 } 584 585 static inline int devm_regulator_unregister_notifier(struct regulator *regulator, 586 struct notifier_block *nb) 587 { 588 return 0; 589 } 590 591 static inline int regulator_suspend_enable(struct regulator_dev *rdev, 592 suspend_state_t state) 593 { 594 return -EINVAL; 595 } 596 597 static inline int regulator_suspend_disable(struct regulator_dev *rdev, 598 suspend_state_t state) 599 { 600 return -EINVAL; 601 } 602 603 static inline int regulator_set_suspend_voltage(struct regulator *regulator, 604 int min_uV, int max_uV, 605 suspend_state_t state) 606 { 607 return -EINVAL; 608 } 609 610 static inline void *regulator_get_drvdata(struct regulator *regulator) 611 { 612 return NULL; 613 } 614 615 static inline void regulator_set_drvdata(struct regulator *regulator, 616 void *data) 617 { 618 } 619 620 static inline int regulator_count_voltages(struct regulator *regulator) 621 { 622 return 0; 623 } 624 625 static inline int regulator_list_voltage(struct regulator *regulator, unsigned selector) 626 { 627 return -EINVAL; 628 } 629 630 static inline void 631 regulator_bulk_set_supply_names(struct regulator_bulk_data *consumers, 632 const char *const *supply_names, 633 unsigned int num_supplies) 634 { 635 } 636 637 static inline bool 638 regulator_is_equal(struct regulator *reg1, struct regulator *reg2) 639 { 640 return false; 641 } 642 #endif 643 644 static inline int regulator_set_voltage_triplet(struct regulator *regulator, 645 int min_uV, int target_uV, 646 int max_uV) 647 { 648 if (regulator_set_voltage(regulator, target_uV, max_uV) == 0) 649 return 0; 650 651 return regulator_set_voltage(regulator, min_uV, max_uV); 652 } 653 654 static inline int regulator_set_voltage_tol(struct regulator *regulator, 655 int new_uV, int tol_uV) 656 { 657 if (regulator_set_voltage(regulator, new_uV, new_uV + tol_uV) == 0) 658 return 0; 659 else 660 return regulator_set_voltage(regulator, 661 new_uV - tol_uV, new_uV + tol_uV); 662 } 663 664 static inline int regulator_is_supported_voltage_tol(struct regulator *regulator, 665 int target_uV, int tol_uV) 666 { 667 return regulator_is_supported_voltage(regulator, 668 target_uV - tol_uV, 669 target_uV + tol_uV); 670 } 671 672 #endif 673