1/* 2 * driver.h -- SoC Regulator driver support. 3 * 4 * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC. 5 * 6 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 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 Driver Interface. 13 */ 14 15#ifndef __LINUX_REGULATOR_DRIVER_H_ 16#define __LINUX_REGULATOR_DRIVER_H_ 17 18#include <linux/device.h> 19#include <linux/notifier.h> 20#include <linux/regulator/consumer.h> 21 22struct regmap; 23struct regulator_dev; 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_linar_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 * @get_voltage_sel: Return the currently configured voltage selector for the 84 * regulator. 85 * @list_voltage: Return one of the supported voltages, in microvolts; zero 86 * if the selector indicates a voltage that is unusable on this system; 87 * or negative errno. Selectors range from zero to one less than 88 * regulator_desc.n_voltages. Voltages may be reported in any order. 89 * 90 * @set_current_limit: Configure a limit for a current-limited regulator. 91 * The driver should select the current closest to max_uA. 92 * @get_current_limit: Get the configured limit for a current-limited regulator. 93 * 94 * @set_mode: Set the configured operating mode for the regulator. 95 * @get_mode: Get the configured operating mode for the regulator. 96 * @get_status: Return actual (not as-configured) status of regulator, as a 97 * REGULATOR_STATUS value (or negative errno) 98 * @get_optimum_mode: Get the most efficient operating mode for the regulator 99 * when running with the specified parameters. 100 * 101 * @set_bypass: Set the regulator in bypass mode. 102 * @get_bypass: Get the regulator bypass mode state. 103 * 104 * @enable_time: Time taken for the regulator voltage output voltage to 105 * stabilise after being enabled, in microseconds. 106 * @set_ramp_delay: Set the ramp delay for the regulator. The driver should 107 * select ramp delay equal to or less than(closest) ramp_delay. 108 * @set_voltage_time_sel: Time taken for the regulator voltage output voltage 109 * to stabilise after being set to a new value, in microseconds. 110 * The function provides the from and to voltage selector, the 111 * function should return the worst case. 112 * 113 * @set_suspend_voltage: Set the voltage for the regulator when the system 114 * is suspended. 115 * @set_suspend_enable: Mark the regulator as enabled when the system is 116 * suspended. 117 * @set_suspend_disable: Mark the regulator as disabled when the system is 118 * suspended. 119 * @set_suspend_mode: Set the operating mode for the regulator when the 120 * system is suspended. 121 * 122 * This struct describes regulator operations which can be implemented by 123 * regulator chip drivers. 124 */ 125struct regulator_ops { 126 127 /* enumerate supported voltages */ 128 int (*list_voltage) (struct regulator_dev *, unsigned selector); 129 130 /* get/set regulator voltage */ 131 int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV, 132 unsigned *selector); 133 int (*map_voltage)(struct regulator_dev *, int min_uV, int max_uV); 134 int (*set_voltage_sel) (struct regulator_dev *, unsigned selector); 135 int (*get_voltage) (struct regulator_dev *); 136 int (*get_voltage_sel) (struct regulator_dev *); 137 138 /* get/set regulator current */ 139 int (*set_current_limit) (struct regulator_dev *, 140 int min_uA, int max_uA); 141 int (*get_current_limit) (struct regulator_dev *); 142 143 /* enable/disable regulator */ 144 int (*enable) (struct regulator_dev *); 145 int (*disable) (struct regulator_dev *); 146 int (*is_enabled) (struct regulator_dev *); 147 148 /* get/set regulator operating mode (defined in consumer.h) */ 149 int (*set_mode) (struct regulator_dev *, unsigned int mode); 150 unsigned int (*get_mode) (struct regulator_dev *); 151 152 /* Time taken to enable or set voltage on the regulator */ 153 int (*enable_time) (struct regulator_dev *); 154 int (*set_ramp_delay) (struct regulator_dev *, int ramp_delay); 155 int (*set_voltage_time_sel) (struct regulator_dev *, 156 unsigned int old_selector, 157 unsigned int new_selector); 158 159 /* report regulator status ... most other accessors report 160 * control inputs, this reports results of combining inputs 161 * from Linux (and other sources) with the actual load. 162 * returns REGULATOR_STATUS_* or negative errno. 163 */ 164 int (*get_status)(struct regulator_dev *); 165 166 /* get most efficient regulator operating mode for load */ 167 unsigned int (*get_optimum_mode) (struct regulator_dev *, int input_uV, 168 int output_uV, int load_uA); 169 170 /* control and report on bypass mode */ 171 int (*set_bypass)(struct regulator_dev *dev, bool enable); 172 int (*get_bypass)(struct regulator_dev *dev, bool *enable); 173 174 /* the operations below are for configuration of regulator state when 175 * its parent PMIC enters a global STANDBY/HIBERNATE state */ 176 177 /* set regulator suspend voltage */ 178 int (*set_suspend_voltage) (struct regulator_dev *, int uV); 179 180 /* enable/disable regulator in suspend state */ 181 int (*set_suspend_enable) (struct regulator_dev *); 182 int (*set_suspend_disable) (struct regulator_dev *); 183 184 /* set regulator suspend operating mode (defined in consumer.h) */ 185 int (*set_suspend_mode) (struct regulator_dev *, unsigned int mode); 186}; 187 188/* 189 * Regulators can either control voltage or current. 190 */ 191enum regulator_type { 192 REGULATOR_VOLTAGE, 193 REGULATOR_CURRENT, 194}; 195 196/** 197 * struct regulator_desc - Static regulator descriptor 198 * 199 * Each regulator registered with the core is described with a 200 * structure of this type and a struct regulator_config. This 201 * structure contains the non-varying parts of the regulator 202 * description. 203 * 204 * @name: Identifying name for the regulator. 205 * @supply_name: Identifying the regulator supply 206 * @id: Numerical identifier for the regulator. 207 * @ops: Regulator operations table. 208 * @irq: Interrupt number for the regulator. 209 * @type: Indicates if the regulator is a voltage or current regulator. 210 * @owner: Module providing the regulator, used for refcounting. 211 * 212 * @continuous_voltage_range: Indicates if the regulator can set any 213 * voltage within constrains range. 214 * @n_voltages: Number of selectors available for ops.list_voltage(). 215 * 216 * @min_uV: Voltage given by the lowest selector (if linear mapping) 217 * @uV_step: Voltage increase with each selector (if linear mapping) 218 * @linear_min_sel: Minimal selector for starting linear mapping 219 * @fixed_uV: Fixed voltage of rails. 220 * @ramp_delay: Time to settle down after voltage change (unit: uV/us) 221 * @linear_ranges: A constant table of possible voltage ranges. 222 * @n_linear_ranges: Number of entries in the @linear_ranges table. 223 * @volt_table: Voltage mapping table (if table based mapping) 224 * 225 * @vsel_reg: Register for selector when using regulator_regmap_X_voltage_ 226 * @vsel_mask: Mask for register bitfield used for selector 227 * @apply_reg: Register for initiate voltage change on the output when 228 * using regulator_set_voltage_sel_regmap 229 * @apply_bit: Register bitfield used for initiate voltage change on the 230 * output when using regulator_set_voltage_sel_regmap 231 * @enable_reg: Register for control when using regmap enable/disable ops 232 * @enable_mask: Mask for control when using regmap enable/disable ops 233 * @enable_val: Enabling value for control when using regmap enable/disable ops 234 * @disable_val: Disabling value for control when using regmap enable/disable ops 235 * @enable_is_inverted: A flag to indicate set enable_mask bits to disable 236 * when using regulator_enable_regmap and friends APIs. 237 * @bypass_reg: Register for control when using regmap set_bypass 238 * @bypass_mask: Mask for control when using regmap set_bypass 239 * @bypass_val_on: Enabling value for control when using regmap set_bypass 240 * @bypass_val_off: Disabling value for control when using regmap set_bypass 241 * 242 * @enable_time: Time taken for initial enable of regulator (in uS). 243 */ 244struct regulator_desc { 245 const char *name; 246 const char *supply_name; 247 int id; 248 bool continuous_voltage_range; 249 unsigned n_voltages; 250 struct regulator_ops *ops; 251 int irq; 252 enum regulator_type type; 253 struct module *owner; 254 255 unsigned int min_uV; 256 unsigned int uV_step; 257 unsigned int linear_min_sel; 258 int fixed_uV; 259 unsigned int ramp_delay; 260 261 const struct regulator_linear_range *linear_ranges; 262 int n_linear_ranges; 263 264 const unsigned int *volt_table; 265 266 unsigned int vsel_reg; 267 unsigned int vsel_mask; 268 unsigned int apply_reg; 269 unsigned int apply_bit; 270 unsigned int enable_reg; 271 unsigned int enable_mask; 272 unsigned int enable_val; 273 unsigned int disable_val; 274 bool enable_is_inverted; 275 unsigned int bypass_reg; 276 unsigned int bypass_mask; 277 unsigned int bypass_val_on; 278 unsigned int bypass_val_off; 279 280 unsigned int enable_time; 281}; 282 283/** 284 * struct regulator_config - Dynamic regulator descriptor 285 * 286 * Each regulator registered with the core is described with a 287 * structure of this type and a struct regulator_desc. This structure 288 * contains the runtime variable parts of the regulator description. 289 * 290 * @dev: struct device for the regulator 291 * @init_data: platform provided init data, passed through by driver 292 * @driver_data: private regulator data 293 * @of_node: OpenFirmware node to parse for device tree bindings (may be 294 * NULL). 295 * @regmap: regmap to use for core regmap helpers if dev_get_regulator() is 296 * insufficient. 297 * @ena_gpio: GPIO controlling regulator enable. 298 * @ena_gpio_invert: Sense for GPIO enable control. 299 * @ena_gpio_flags: Flags to use when calling gpio_request_one() 300 */ 301struct regulator_config { 302 struct device *dev; 303 const struct regulator_init_data *init_data; 304 void *driver_data; 305 struct device_node *of_node; 306 struct regmap *regmap; 307 308 int ena_gpio; 309 unsigned int ena_gpio_invert:1; 310 unsigned int ena_gpio_flags; 311}; 312 313/* 314 * struct regulator_dev 315 * 316 * Voltage / Current regulator class device. One for each 317 * regulator. 318 * 319 * This should *not* be used directly by anything except the regulator 320 * core and notification injection (which should take the mutex and do 321 * no other direct access). 322 */ 323struct regulator_dev { 324 const struct regulator_desc *desc; 325 int exclusive; 326 u32 use_count; 327 u32 open_count; 328 u32 bypass_count; 329 330 /* lists we belong to */ 331 struct list_head list; /* list of all regulators */ 332 333 /* lists we own */ 334 struct list_head consumer_list; /* consumers we supply */ 335 336 struct blocking_notifier_head notifier; 337 struct mutex mutex; /* consumer lock */ 338 struct module *owner; 339 struct device dev; 340 struct regulation_constraints *constraints; 341 struct regulator *supply; /* for tree */ 342 struct regmap *regmap; 343 344 struct delayed_work disable_work; 345 int deferred_disables; 346 347 void *reg_data; /* regulator_dev data */ 348 349 struct dentry *debugfs; 350 351 struct regulator_enable_gpio *ena_pin; 352 unsigned int ena_gpio_state:1; 353}; 354 355struct regulator_dev * 356regulator_register(const struct regulator_desc *regulator_desc, 357 const struct regulator_config *config); 358struct regulator_dev * 359devm_regulator_register(struct device *dev, 360 const struct regulator_desc *regulator_desc, 361 const struct regulator_config *config); 362void regulator_unregister(struct regulator_dev *rdev); 363void devm_regulator_unregister(struct device *dev, struct regulator_dev *rdev); 364 365int regulator_notifier_call_chain(struct regulator_dev *rdev, 366 unsigned long event, void *data); 367 368void *rdev_get_drvdata(struct regulator_dev *rdev); 369struct device *rdev_get_dev(struct regulator_dev *rdev); 370int rdev_get_id(struct regulator_dev *rdev); 371 372int regulator_mode_to_status(unsigned int); 373 374int regulator_list_voltage_linear(struct regulator_dev *rdev, 375 unsigned int selector); 376int regulator_list_voltage_linear_range(struct regulator_dev *rdev, 377 unsigned int selector); 378int regulator_list_voltage_table(struct regulator_dev *rdev, 379 unsigned int selector); 380int regulator_map_voltage_linear(struct regulator_dev *rdev, 381 int min_uV, int max_uV); 382int regulator_map_voltage_linear_range(struct regulator_dev *rdev, 383 int min_uV, int max_uV); 384int regulator_map_voltage_iterate(struct regulator_dev *rdev, 385 int min_uV, int max_uV); 386int regulator_map_voltage_ascend(struct regulator_dev *rdev, 387 int min_uV, int max_uV); 388int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev); 389int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel); 390int regulator_is_enabled_regmap(struct regulator_dev *rdev); 391int regulator_enable_regmap(struct regulator_dev *rdev); 392int regulator_disable_regmap(struct regulator_dev *rdev); 393int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 394 unsigned int old_selector, 395 unsigned int new_selector); 396int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable); 397int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable); 398 399void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data); 400 401#endif 402