1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * driver.h -- SoC Regulator driver support. 4 * 5 * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * Regulator Driver Interface. 10 */ 11 12#ifndef __LINUX_REGULATOR_DRIVER_H_ 13#define __LINUX_REGULATOR_DRIVER_H_ 14 15#include <linux/device.h> 16#include <linux/notifier.h> 17#include <linux/regulator/consumer.h> 18#include <linux/ww_mutex.h> 19 20struct gpio_desc; 21struct regmap; 22struct regulator_dev; 23struct regulator_config; 24struct regulator_init_data; 25struct regulator_enable_gpio; 26 27enum regulator_status { 28 REGULATOR_STATUS_OFF, 29 REGULATOR_STATUS_ON, 30 REGULATOR_STATUS_ERROR, 31 /* fast/normal/idle/standby are flavors of "on" */ 32 REGULATOR_STATUS_FAST, 33 REGULATOR_STATUS_NORMAL, 34 REGULATOR_STATUS_IDLE, 35 REGULATOR_STATUS_STANDBY, 36 /* The regulator is enabled but not regulating */ 37 REGULATOR_STATUS_BYPASS, 38 /* in case that any other status doesn't apply */ 39 REGULATOR_STATUS_UNDEFINED, 40}; 41 42/** 43 * struct regulator_linear_range - specify linear voltage ranges 44 * 45 * Specify a range of voltages for regulator_map_linear_range() and 46 * regulator_list_linear_range(). 47 * 48 * @min_uV: Lowest voltage in range 49 * @min_sel: Lowest selector for range 50 * @max_sel: Highest selector for range 51 * @uV_step: Step size 52 */ 53struct regulator_linear_range { 54 unsigned int min_uV; 55 unsigned int min_sel; 56 unsigned int max_sel; 57 unsigned int uV_step; 58}; 59 60/* Initialize struct regulator_linear_range */ 61#define REGULATOR_LINEAR_RANGE(_min_uV, _min_sel, _max_sel, _step_uV) \ 62{ \ 63 .min_uV = _min_uV, \ 64 .min_sel = _min_sel, \ 65 .max_sel = _max_sel, \ 66 .uV_step = _step_uV, \ 67} 68 69/** 70 * struct regulator_ops - regulator operations. 71 * 72 * @enable: Configure the regulator as enabled. 73 * @disable: Configure the regulator as disabled. 74 * @is_enabled: Return 1 if the regulator is enabled, 0 if not. 75 * May also return negative errno. 76 * 77 * @set_voltage: Set the voltage for the regulator within the range specified. 78 * The driver should select the voltage closest to min_uV. 79 * @set_voltage_sel: Set the voltage for the regulator using the specified 80 * selector. 81 * @map_voltage: Convert a voltage into a selector 82 * @get_voltage: Return the currently configured voltage for the regulator; 83 * return -ENOTRECOVERABLE if regulator can't be read at 84 * bootup and hasn't been set yet. 85 * @get_voltage_sel: Return the currently configured voltage selector for the 86 * regulator; return -ENOTRECOVERABLE if regulator can't 87 * be read at bootup and hasn't been set yet. 88 * @list_voltage: Return one of the supported voltages, in microvolts; zero 89 * if the selector indicates a voltage that is unusable on this system; 90 * or negative errno. Selectors range from zero to one less than 91 * regulator_desc.n_voltages. Voltages may be reported in any order. 92 * 93 * @set_current_limit: Configure a limit for a current-limited regulator. 94 * The driver should select the current closest to max_uA. 95 * @get_current_limit: Get the configured limit for a current-limited regulator. 96 * @set_input_current_limit: Configure an input limit. 97 * 98 * @set_over_current_protection: Support capability of automatically shutting 99 * down when detecting an over current event. 100 * 101 * @set_active_discharge: Set active discharge enable/disable of regulators. 102 * 103 * @set_mode: Set the configured operating mode for the regulator. 104 * @get_mode: Get the configured operating mode for the regulator. 105 * @get_error_flags: Get the current error(s) for the regulator. 106 * @get_status: Return actual (not as-configured) status of regulator, as a 107 * REGULATOR_STATUS value (or negative errno) 108 * @get_optimum_mode: Get the most efficient operating mode for the regulator 109 * when running with the specified parameters. 110 * @set_load: Set the load for the regulator. 111 * 112 * @set_bypass: Set the regulator in bypass mode. 113 * @get_bypass: Get the regulator bypass mode state. 114 * 115 * @enable_time: Time taken for the regulator voltage output voltage to 116 * stabilise after being enabled, in microseconds. 117 * @set_ramp_delay: Set the ramp delay for the regulator. The driver should 118 * select ramp delay equal to or less than(closest) ramp_delay. 119 * @set_voltage_time: Time taken for the regulator voltage output voltage 120 * to stabilise after being set to a new value, in microseconds. 121 * The function receives the from and to voltage as input, it 122 * should return the worst case. 123 * @set_voltage_time_sel: Time taken for the regulator voltage output voltage 124 * to stabilise after being set to a new value, in microseconds. 125 * The function receives the from and to voltage selector as 126 * input, it should return the worst case. 127 * @set_soft_start: Enable soft start for the regulator. 128 * 129 * @set_suspend_voltage: Set the voltage for the regulator when the system 130 * is suspended. 131 * @set_suspend_enable: Mark the regulator as enabled when the system is 132 * suspended. 133 * @set_suspend_disable: Mark the regulator as disabled when the system is 134 * suspended. 135 * @set_suspend_mode: Set the operating mode for the regulator when the 136 * system is suspended. 137 * 138 * @set_pull_down: Configure the regulator to pull down when the regulator 139 * is disabled. 140 * 141 * This struct describes regulator operations which can be implemented by 142 * regulator chip drivers. 143 */ 144struct regulator_ops { 145 146 /* enumerate supported voltages */ 147 int (*list_voltage) (struct regulator_dev *, unsigned selector); 148 149 /* get/set regulator voltage */ 150 int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV, 151 unsigned *selector); 152 int (*map_voltage)(struct regulator_dev *, int min_uV, int max_uV); 153 int (*set_voltage_sel) (struct regulator_dev *, unsigned selector); 154 int (*get_voltage) (struct regulator_dev *); 155 int (*get_voltage_sel) (struct regulator_dev *); 156 157 /* get/set regulator current */ 158 int (*set_current_limit) (struct regulator_dev *, 159 int min_uA, int max_uA); 160 int (*get_current_limit) (struct regulator_dev *); 161 162 int (*set_input_current_limit) (struct regulator_dev *, int lim_uA); 163 int (*set_over_current_protection) (struct regulator_dev *); 164 int (*set_active_discharge) (struct regulator_dev *, bool enable); 165 166 /* enable/disable regulator */ 167 int (*enable) (struct regulator_dev *); 168 int (*disable) (struct regulator_dev *); 169 int (*is_enabled) (struct regulator_dev *); 170 171 /* get/set regulator operating mode (defined in consumer.h) */ 172 int (*set_mode) (struct regulator_dev *, unsigned int mode); 173 unsigned int (*get_mode) (struct regulator_dev *); 174 175 /* retrieve current error flags on the regulator */ 176 int (*get_error_flags)(struct regulator_dev *, unsigned int *flags); 177 178 /* Time taken to enable or set voltage on the regulator */ 179 int (*enable_time) (struct regulator_dev *); 180 int (*set_ramp_delay) (struct regulator_dev *, int ramp_delay); 181 int (*set_voltage_time) (struct regulator_dev *, int old_uV, 182 int new_uV); 183 int (*set_voltage_time_sel) (struct regulator_dev *, 184 unsigned int old_selector, 185 unsigned int new_selector); 186 187 int (*set_soft_start) (struct regulator_dev *); 188 189 /* report regulator status ... most other accessors report 190 * control inputs, this reports results of combining inputs 191 * from Linux (and other sources) with the actual load. 192 * returns REGULATOR_STATUS_* or negative errno. 193 */ 194 int (*get_status)(struct regulator_dev *); 195 196 /* get most efficient regulator operating mode for load */ 197 unsigned int (*get_optimum_mode) (struct regulator_dev *, int input_uV, 198 int output_uV, int load_uA); 199 /* set the load on the regulator */ 200 int (*set_load)(struct regulator_dev *, int load_uA); 201 202 /* control and report on bypass mode */ 203 int (*set_bypass)(struct regulator_dev *dev, bool enable); 204 int (*get_bypass)(struct regulator_dev *dev, bool *enable); 205 206 /* the operations below are for configuration of regulator state when 207 * its parent PMIC enters a global STANDBY/HIBERNATE state */ 208 209 /* set regulator suspend voltage */ 210 int (*set_suspend_voltage) (struct regulator_dev *, int uV); 211 212 /* enable/disable regulator in suspend state */ 213 int (*set_suspend_enable) (struct regulator_dev *); 214 int (*set_suspend_disable) (struct regulator_dev *); 215 216 /* set regulator suspend operating mode (defined in consumer.h) */ 217 int (*set_suspend_mode) (struct regulator_dev *, unsigned int mode); 218 219 int (*resume)(struct regulator_dev *rdev); 220 221 int (*set_pull_down) (struct regulator_dev *); 222}; 223 224/* 225 * Regulators can either control voltage or current. 226 */ 227enum regulator_type { 228 REGULATOR_VOLTAGE, 229 REGULATOR_CURRENT, 230}; 231 232/** 233 * struct regulator_desc - Static regulator descriptor 234 * 235 * Each regulator registered with the core is described with a 236 * structure of this type and a struct regulator_config. This 237 * structure contains the non-varying parts of the regulator 238 * description. 239 * 240 * @name: Identifying name for the regulator. 241 * @supply_name: Identifying the regulator supply 242 * @of_match: Name used to identify regulator in DT. 243 * @regulators_node: Name of node containing regulator definitions in DT. 244 * @of_parse_cb: Optional callback called only if of_match is present. 245 * Will be called for each regulator parsed from DT, during 246 * init_data parsing. 247 * The regulator_config passed as argument to the callback will 248 * be a copy of config passed to regulator_register, valid only 249 * for this particular call. Callback may freely change the 250 * config but it cannot store it for later usage. 251 * Callback should return 0 on success or negative ERRNO 252 * indicating failure. 253 * @id: Numerical identifier for the regulator. 254 * @ops: Regulator operations table. 255 * @irq: Interrupt number for the regulator. 256 * @type: Indicates if the regulator is a voltage or current regulator. 257 * @owner: Module providing the regulator, used for refcounting. 258 * 259 * @continuous_voltage_range: Indicates if the regulator can set any 260 * voltage within constrains range. 261 * @n_voltages: Number of selectors available for ops.list_voltage(). 262 * @n_current_limits: Number of selectors available for current limits 263 * 264 * @min_uV: Voltage given by the lowest selector (if linear mapping) 265 * @uV_step: Voltage increase with each selector (if linear mapping) 266 * @linear_min_sel: Minimal selector for starting linear mapping 267 * @fixed_uV: Fixed voltage of rails. 268 * @ramp_delay: Time to settle down after voltage change (unit: uV/us) 269 * @min_dropout_uV: The minimum dropout voltage this regulator can handle 270 * @linear_ranges: A constant table of possible voltage ranges. 271 * @linear_range_selectors: A constant table of voltage range selectors. 272 * If pickable ranges are used each range must 273 * have corresponding selector here. 274 * @n_linear_ranges: Number of entries in the @linear_ranges (and in 275 * linear_range_selectors if used) table(s). 276 * @volt_table: Voltage mapping table (if table based mapping) 277 * @curr_table: Current limit mapping table (if table based mapping) 278 * 279 * @vsel_range_reg: Register for range selector when using pickable ranges 280 * and regulator_regmap_X_voltage_X_pickable functions. 281 * @vsel_range_mask: Mask for register bitfield used for range selector 282 * @vsel_reg: Register for selector when using regulator_regmap_X_voltage_ 283 * @vsel_mask: Mask for register bitfield used for selector 284 * @vsel_step: Specify the resolution of selector stepping when setting 285 * voltage. If 0, then no stepping is done (requested selector is 286 * set directly), if >0 then the regulator API will ramp the 287 * voltage up/down gradually each time increasing/decreasing the 288 * selector by the specified step value. 289 * @csel_reg: Register for current limit selector using regmap set_current_limit 290 * @csel_mask: Mask for register bitfield used for current limit selector 291 * @apply_reg: Register for initiate voltage change on the output when 292 * using regulator_set_voltage_sel_regmap 293 * @apply_bit: Register bitfield used for initiate voltage change on the 294 * output when using regulator_set_voltage_sel_regmap 295 * @enable_reg: Register for control when using regmap enable/disable ops 296 * @enable_mask: Mask for control when using regmap enable/disable ops 297 * @enable_val: Enabling value for control when using regmap enable/disable ops 298 * @disable_val: Disabling value for control when using regmap enable/disable ops 299 * @enable_is_inverted: A flag to indicate set enable_mask bits to disable 300 * when using regulator_enable_regmap and friends APIs. 301 * @bypass_reg: Register for control when using regmap set_bypass 302 * @bypass_mask: Mask for control when using regmap set_bypass 303 * @bypass_val_on: Enabling value for control when using regmap set_bypass 304 * @bypass_val_off: Disabling value for control when using regmap set_bypass 305 * @active_discharge_off: Enabling value for control when using regmap 306 * set_active_discharge 307 * @active_discharge_on: Disabling value for control when using regmap 308 * set_active_discharge 309 * @active_discharge_mask: Mask for control when using regmap 310 * set_active_discharge 311 * @active_discharge_reg: Register for control when using regmap 312 * set_active_discharge 313 * @soft_start_reg: Register for control when using regmap set_soft_start 314 * @soft_start_mask: Mask for control when using regmap set_soft_start 315 * @soft_start_val_on: Enabling value for control when using regmap 316 * set_soft_start 317 * @pull_down_reg: Register for control when using regmap set_pull_down 318 * @pull_down_mask: Mask for control when using regmap set_pull_down 319 * @pull_down_val_on: Enabling value for control when using regmap 320 * set_pull_down 321 * 322 * @enable_time: Time taken for initial enable of regulator (in uS). 323 * @off_on_delay: guard time (in uS), before re-enabling a regulator 324 * 325 * @of_map_mode: Maps a hardware mode defined in a DeviceTree to a standard mode 326 */ 327struct regulator_desc { 328 const char *name; 329 const char *supply_name; 330 const char *of_match; 331 const char *regulators_node; 332 int (*of_parse_cb)(struct device_node *, 333 const struct regulator_desc *, 334 struct regulator_config *); 335 int id; 336 unsigned int continuous_voltage_range:1; 337 unsigned n_voltages; 338 unsigned int n_current_limits; 339 const struct regulator_ops *ops; 340 int irq; 341 enum regulator_type type; 342 struct module *owner; 343 344 unsigned int min_uV; 345 unsigned int uV_step; 346 unsigned int linear_min_sel; 347 int fixed_uV; 348 unsigned int ramp_delay; 349 int min_dropout_uV; 350 351 const struct regulator_linear_range *linear_ranges; 352 const unsigned int *linear_range_selectors; 353 354 int n_linear_ranges; 355 356 const unsigned int *volt_table; 357 const unsigned int *curr_table; 358 359 unsigned int vsel_range_reg; 360 unsigned int vsel_range_mask; 361 unsigned int vsel_reg; 362 unsigned int vsel_mask; 363 unsigned int vsel_step; 364 unsigned int csel_reg; 365 unsigned int csel_mask; 366 unsigned int apply_reg; 367 unsigned int apply_bit; 368 unsigned int enable_reg; 369 unsigned int enable_mask; 370 unsigned int enable_val; 371 unsigned int disable_val; 372 bool enable_is_inverted; 373 unsigned int bypass_reg; 374 unsigned int bypass_mask; 375 unsigned int bypass_val_on; 376 unsigned int bypass_val_off; 377 unsigned int active_discharge_on; 378 unsigned int active_discharge_off; 379 unsigned int active_discharge_mask; 380 unsigned int active_discharge_reg; 381 unsigned int soft_start_reg; 382 unsigned int soft_start_mask; 383 unsigned int soft_start_val_on; 384 unsigned int pull_down_reg; 385 unsigned int pull_down_mask; 386 unsigned int pull_down_val_on; 387 388 unsigned int enable_time; 389 390 unsigned int off_on_delay; 391 392 unsigned int (*of_map_mode)(unsigned int mode); 393}; 394 395/** 396 * struct regulator_config - Dynamic regulator descriptor 397 * 398 * Each regulator registered with the core is described with a 399 * structure of this type and a struct regulator_desc. This structure 400 * contains the runtime variable parts of the regulator description. 401 * 402 * @dev: struct device for the regulator 403 * @init_data: platform provided init data, passed through by driver 404 * @driver_data: private regulator data 405 * @of_node: OpenFirmware node to parse for device tree bindings (may be 406 * NULL). 407 * @regmap: regmap to use for core regmap helpers if dev_get_regmap() is 408 * insufficient. 409 * @ena_gpiod: GPIO controlling regulator enable. 410 */ 411struct regulator_config { 412 struct device *dev; 413 const struct regulator_init_data *init_data; 414 void *driver_data; 415 struct device_node *of_node; 416 struct regmap *regmap; 417 418 struct gpio_desc *ena_gpiod; 419}; 420 421/* 422 * struct coupling_desc 423 * 424 * Describes coupling of regulators. Each regulator should have 425 * at least a pointer to itself in coupled_rdevs array. 426 * When a new coupled regulator is resolved, n_resolved is 427 * incremented. 428 */ 429struct coupling_desc { 430 struct regulator_dev **coupled_rdevs; 431 struct regulator_coupler *coupler; 432 int n_resolved; 433 int n_coupled; 434}; 435 436/* 437 * struct regulator_dev 438 * 439 * Voltage / Current regulator class device. One for each 440 * regulator. 441 * 442 * This should *not* be used directly by anything except the regulator 443 * core and notification injection (which should take the mutex and do 444 * no other direct access). 445 */ 446struct regulator_dev { 447 const struct regulator_desc *desc; 448 int exclusive; 449 u32 use_count; 450 u32 open_count; 451 u32 bypass_count; 452 453 /* lists we belong to */ 454 struct list_head list; /* list of all regulators */ 455 456 /* lists we own */ 457 struct list_head consumer_list; /* consumers we supply */ 458 459 struct coupling_desc coupling_desc; 460 461 struct blocking_notifier_head notifier; 462 struct ww_mutex mutex; /* consumer lock */ 463 struct task_struct *mutex_owner; 464 int ref_cnt; 465 struct module *owner; 466 struct device dev; 467 struct regulation_constraints *constraints; 468 struct regulator *supply; /* for tree */ 469 const char *supply_name; 470 struct regmap *regmap; 471 472 struct delayed_work disable_work; 473 474 void *reg_data; /* regulator_dev data */ 475 476 struct dentry *debugfs; 477 478 struct regulator_enable_gpio *ena_pin; 479 unsigned int ena_gpio_state:1; 480 481 unsigned int is_switch:1; 482 483 /* time when this regulator was disabled last time */ 484 unsigned long last_off_jiffy; 485}; 486 487struct regulator_dev * 488regulator_register(const struct regulator_desc *regulator_desc, 489 const struct regulator_config *config); 490struct regulator_dev * 491devm_regulator_register(struct device *dev, 492 const struct regulator_desc *regulator_desc, 493 const struct regulator_config *config); 494void regulator_unregister(struct regulator_dev *rdev); 495void devm_regulator_unregister(struct device *dev, struct regulator_dev *rdev); 496 497int regulator_notifier_call_chain(struct regulator_dev *rdev, 498 unsigned long event, void *data); 499 500void *rdev_get_drvdata(struct regulator_dev *rdev); 501struct device *rdev_get_dev(struct regulator_dev *rdev); 502struct regmap *rdev_get_regmap(struct regulator_dev *rdev); 503int rdev_get_id(struct regulator_dev *rdev); 504 505int regulator_mode_to_status(unsigned int); 506 507int regulator_list_voltage_linear(struct regulator_dev *rdev, 508 unsigned int selector); 509int regulator_list_voltage_pickable_linear_range(struct regulator_dev *rdev, 510 unsigned int selector); 511int regulator_list_voltage_linear_range(struct regulator_dev *rdev, 512 unsigned int selector); 513int regulator_list_voltage_table(struct regulator_dev *rdev, 514 unsigned int selector); 515int regulator_map_voltage_linear(struct regulator_dev *rdev, 516 int min_uV, int max_uV); 517int regulator_map_voltage_pickable_linear_range(struct regulator_dev *rdev, 518 int min_uV, int max_uV); 519int regulator_map_voltage_linear_range(struct regulator_dev *rdev, 520 int min_uV, int max_uV); 521int regulator_map_voltage_iterate(struct regulator_dev *rdev, 522 int min_uV, int max_uV); 523int regulator_map_voltage_ascend(struct regulator_dev *rdev, 524 int min_uV, int max_uV); 525int regulator_get_voltage_sel_pickable_regmap(struct regulator_dev *rdev); 526int regulator_set_voltage_sel_pickable_regmap(struct regulator_dev *rdev, 527 unsigned int sel); 528int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev); 529int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel); 530int regulator_is_enabled_regmap(struct regulator_dev *rdev); 531int regulator_enable_regmap(struct regulator_dev *rdev); 532int regulator_disable_regmap(struct regulator_dev *rdev); 533int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 534 unsigned int old_selector, 535 unsigned int new_selector); 536int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable); 537int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable); 538int regulator_set_soft_start_regmap(struct regulator_dev *rdev); 539int regulator_set_pull_down_regmap(struct regulator_dev *rdev); 540 541int regulator_set_active_discharge_regmap(struct regulator_dev *rdev, 542 bool enable); 543int regulator_set_current_limit_regmap(struct regulator_dev *rdev, 544 int min_uA, int max_uA); 545int regulator_get_current_limit_regmap(struct regulator_dev *rdev); 546void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data); 547 548void regulator_lock(struct regulator_dev *rdev); 549void regulator_unlock(struct regulator_dev *rdev); 550 551/* 552 * Helper functions intended to be used by regulator drivers prior registering 553 * their regulators. 554 */ 555int regulator_desc_list_voltage_linear_range(const struct regulator_desc *desc, 556 unsigned int selector); 557 558#endif 559