include/linux/regulator/driver.h

   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
  22 struct regmap;
  23 struct regulator_dev;
  24 struct regulator_config;
  25 struct regulator_init_data;
  26 struct regulator_enable_gpio;
  27
  28 enum regulator_status {
  29         REGULATOR_STATUS_OFF,
  30         REGULATOR_STATUS_ON,
  31         REGULATOR_STATUS_ERROR,
  32         /* fast/normal/idle/standby are flavors of "on" */
  33         REGULATOR_STATUS_FAST,
  34         REGULATOR_STATUS_NORMAL,
  35         REGULATOR_STATUS_IDLE,
  36         REGULATOR_STATUS_STANDBY,
  37         /* The regulator is enabled but not regulating */
  38         REGULATOR_STATUS_BYPASS,
  39         /* in case that any other status doesn't apply */
  40         REGULATOR_STATUS_UNDEFINED,
  41 };
  42
  43 /**
  44  * struct regulator_linear_range - specify linear voltage ranges
  45  *
  46  * Specify a range of voltages for regulator_map_linar_range() and
  47  * regulator_list_linear_range().
  48  *
  49  * @min_uV:  Lowest voltage in range
  50  * @min_sel: Lowest selector for range
  51  * @max_sel: Highest selector for range
  52  * @uV_step: Step size
  53  */
  54 struct regulator_linear_range {
  55         unsigned int min_uV;
  56         unsigned int min_sel;
  57         unsigned int max_sel;
  58         unsigned int uV_step;
  59 };
  60
  61 /* Initialize struct regulator_linear_range */
  62 #define REGULATOR_LINEAR_RANGE(_min_uV, _min_sel, _max_sel, _step_uV)   \
  63 {                                                                       \
  64         .min_uV         = _min_uV,                                      \
  65         .min_sel        = _min_sel,                                     \
  66         .max_sel        = _max_sel,                                     \
  67         .uV_step        = _step_uV,                                     \
  68 }
  69
  70 /**
  71  * struct regulator_ops - regulator operations.
  72  *
  73  * @enable: Configure the regulator as enabled.
  74  * @disable: Configure the regulator as disabled.
  75  * @is_enabled: Return 1 if the regulator is enabled, 0 if not.
  76  *              May also return negative errno.
  77  *
  78  * @set_voltage: Set the voltage for the regulator within the range specified.
  79  *               The driver should select the voltage closest to min_uV.
  80  * @set_voltage_sel: Set the voltage for the regulator using the specified
  81  *                   selector.
  82  * @map_voltage: Convert a voltage into a selector
  83  * @get_voltage: Return the currently configured voltage for the regulator.
  84  * @get_voltage_sel: Return the currently configured voltage selector for the
  85  *                   regulator.
  86  * @list_voltage: Return one of the supported voltages, in microvolts; zero
  87  *      if the selector indicates a voltage that is unusable on this system;
  88  *      or negative errno.  Selectors range from zero to one less than
  89  *      regulator_desc.n_voltages.  Voltages may be reported in any order.
  90  *
  91  * @set_current_limit: Configure a limit for a current-limited regulator.
  92  *                     The driver should select the current closest to max_uA.
  93  * @get_current_limit: Get the configured limit for a current-limited regulator.
  94  * @set_input_current_limit: Configure an input limit.
  95  *
  96  * @set_over_current_protection: Support capability of automatically shutting
  97  *                               down when detecting an over current event.
  98  *
  99  * @set_active_discharge: Set active discharge enable/disable of regulators.
 100  *
 101  * @set_mode: Set the configured operating mode for the regulator.
 102  * @get_mode: Get the configured operating mode for the regulator.
 103  * @get_error_flags: Get the current error(s) for the regulator.
 104  * @get_status: Return actual (not as-configured) status of regulator, as a
 105  *      REGULATOR_STATUS value (or negative errno)
 106  * @get_optimum_mode: Get the most efficient operating mode for the regulator
 107  *                    when running with the specified parameters.
 108  * @set_load: Set the load for the regulator.
 109  *
 110  * @set_bypass: Set the regulator in bypass mode.
 111  * @get_bypass: Get the regulator bypass mode state.
 112  *
 113  * @enable_time: Time taken for the regulator voltage output voltage to
 114  *               stabilise after being enabled, in microseconds.
 115  * @set_ramp_delay: Set the ramp delay for the regulator. The driver should
 116  *              select ramp delay equal to or less than(closest) ramp_delay.
 117  * @set_voltage_time: Time taken for the regulator voltage output voltage
 118  *               to stabilise after being set to a new value, in microseconds.
 119  *               The function receives the from and to voltage as input, it
 120  *               should return the worst case.
 121  * @set_voltage_time_sel: Time taken for the regulator voltage output voltage
 122  *               to stabilise after being set to a new value, in microseconds.
 123  *               The function receives the from and to voltage selector as
 124  *               input, it should return the worst case.
 125  * @set_soft_start: Enable soft start for the regulator.
 126  *
 127  * @set_suspend_voltage: Set the voltage for the regulator when the system
 128  *                       is suspended.
 129  * @set_suspend_enable: Mark the regulator as enabled when the system is
 130  *                      suspended.
 131  * @set_suspend_disable: Mark the regulator as disabled when the system is
 132  *                       suspended.
 133  * @set_suspend_mode: Set the operating mode for the regulator when the
 134  *                    system is suspended.
 135  *
 136  * @set_pull_down: Configure the regulator to pull down when the regulator
 137  *                 is disabled.
 138  *
 139  * This struct describes regulator operations which can be implemented by
 140  * regulator chip drivers.
 141  */
 142 struct regulator_ops {
 143
 144         /* enumerate supported voltages */
 145         int (*list_voltage) (struct regulator_dev *, unsigned selector);
 146
 147         /* get/set regulator voltage */
 148         int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV,
 149                             unsigned *selector);
 150         int (*map_voltage)(struct regulator_dev *, int min_uV, int max_uV);
 151         int (*set_voltage_sel) (struct regulator_dev *, unsigned selector);
 152         int (*get_voltage) (struct regulator_dev *);
 153         int (*get_voltage_sel) (struct regulator_dev *);
 154
 155         /* get/set regulator current  */
 156         int (*set_current_limit) (struct regulator_dev *,
 157                                  int min_uA, int max_uA);
 158         int (*get_current_limit) (struct regulator_dev *);
 159
 160         int (*set_input_current_limit) (struct regulator_dev *, int lim_uA);
 161         int (*set_over_current_protection) (struct regulator_dev *);
 162         int (*set_active_discharge) (struct regulator_dev *, bool enable);
 163
 164         /* enable/disable regulator */
 165         int (*enable) (struct regulator_dev *);
 166         int (*disable) (struct regulator_dev *);
 167         int (*is_enabled) (struct regulator_dev *);
 168
 169         /* get/set regulator operating mode (defined in consumer.h) */
 170         int (*set_mode) (struct regulator_dev *, unsigned int mode);
 171         unsigned int (*get_mode) (struct regulator_dev *);
 172
 173         /* retrieve current error flags on the regulator */
 174         int (*get_error_flags)(struct regulator_dev *, unsigned int *flags);
 175
 176         /* Time taken to enable or set voltage on the regulator */
 177         int (*enable_time) (struct regulator_dev *);
 178         int (*set_ramp_delay) (struct regulator_dev *, int ramp_delay);
 179         int (*set_voltage_time) (struct regulator_dev *, int old_uV,
 180                                  int new_uV);
 181         int (*set_voltage_time_sel) (struct regulator_dev *,
 182                                      unsigned int old_selector,
 183                                      unsigned int new_selector);
 184
 185         int (*set_soft_start) (struct regulator_dev *);
 186
 187         /* report regulator status ... most other accessors report
 188          * control inputs, this reports results of combining inputs
 189          * from Linux (and other sources) with the actual load.
 190          * returns REGULATOR_STATUS_* or negative errno.
 191          */
 192         int (*get_status)(struct regulator_dev *);
 193
 194         /* get most efficient regulator operating mode for load */
 195         unsigned int (*get_optimum_mode) (struct regulator_dev *, int input_uV,
 196                                           int output_uV, int load_uA);
 197         /* set the load on the regulator */
 198         int (*set_load)(struct regulator_dev *, int load_uA);
 199
 200         /* control and report on bypass mode */
 201         int (*set_bypass)(struct regulator_dev *dev, bool enable);
 202         int (*get_bypass)(struct regulator_dev *dev, bool *enable);
 203
 204         /* the operations below are for configuration of regulator state when
 205          * its parent PMIC enters a global STANDBY/HIBERNATE state */
 206
 207         /* set regulator suspend voltage */
 208         int (*set_suspend_voltage) (struct regulator_dev *, int uV);
 209
 210         /* enable/disable regulator in suspend state */
 211         int (*set_suspend_enable) (struct regulator_dev *);
 212         int (*set_suspend_disable) (struct regulator_dev *);
 213
 214         /* set regulator suspend operating mode (defined in consumer.h) */
 215         int (*set_suspend_mode) (struct regulator_dev *, unsigned int mode);
 216
 217         int (*resume_early)(struct regulator_dev *rdev);
 218
 219         int (*set_pull_down) (struct regulator_dev *);
 220 };
 221
 222 /*
 223  * Regulators can either control voltage or current.
 224  */
 225 enum regulator_type {
 226         REGULATOR_VOLTAGE,
 227         REGULATOR_CURRENT,
 228 };
 229
 230 /**
 231  * struct regulator_desc - Static regulator descriptor
 232  *
 233  * Each regulator registered with the core is described with a
 234  * structure of this type and a struct regulator_config.  This
 235  * structure contains the non-varying parts of the regulator
 236  * description.
 237  *
 238  * @name: Identifying name for the regulator.
 239  * @supply_name: Identifying the regulator supply
 240  * @of_match: Name used to identify regulator in DT.
 241  * @regulators_node: Name of node containing regulator definitions in DT.
 242  * @of_parse_cb: Optional callback called only if of_match is present.
 243  *               Will be called for each regulator parsed from DT, during
 244  *               init_data parsing.
 245  *               The regulator_config passed as argument to the callback will
 246  *               be a copy of config passed to regulator_register, valid only
 247  *               for this particular call. Callback may freely change the
 248  *               config but it cannot store it for later usage.
 249  *               Callback should return 0 on success or negative ERRNO
 250  *               indicating failure.
 251  * @id: Numerical identifier for the regulator.
 252  * @ops: Regulator operations table.
 253  * @irq: Interrupt number for the regulator.
 254  * @type: Indicates if the regulator is a voltage or current regulator.
 255  * @owner: Module providing the regulator, used for refcounting.
 256  *
 257  * @continuous_voltage_range: Indicates if the regulator can set any
 258  *                            voltage within constrains range.
 259  * @n_voltages: Number of selectors available for ops.list_voltage().
 260  *
 261  * @min_uV: Voltage given by the lowest selector (if linear mapping)
 262  * @uV_step: Voltage increase with each selector (if linear mapping)
 263  * @linear_min_sel: Minimal selector for starting linear mapping
 264  * @fixed_uV: Fixed voltage of rails.
 265  * @ramp_delay: Time to settle down after voltage change (unit: uV/us)
 266  * @min_dropout_uV: The minimum dropout voltage this regulator can handle
 267  * @linear_ranges: A constant table of possible voltage ranges.
 268  * @n_linear_ranges: Number of entries in the @linear_ranges table.
 269  * @volt_table: Voltage mapping table (if table based mapping)
 270  *
 271  * @vsel_reg: Register for selector when using regulator_regmap_X_voltage_
 272  * @vsel_mask: Mask for register bitfield used for selector
 273  * @csel_reg: Register for TPS65218 LS3 current regulator
 274  * @csel_mask: Mask for TPS65218 LS3 current regulator
 275  * @apply_reg: Register for initiate voltage change on the output when
 276  *                using regulator_set_voltage_sel_regmap
 277  * @apply_bit: Register bitfield used for initiate voltage change on the
 278  *                output when using regulator_set_voltage_sel_regmap
 279  * @enable_reg: Register for control when using regmap enable/disable ops
 280  * @enable_mask: Mask for control when using regmap enable/disable ops
 281  * @enable_val: Enabling value for control when using regmap enable/disable ops
 282  * @disable_val: Disabling value for control when using regmap enable/disable ops
 283  * @enable_is_inverted: A flag to indicate set enable_mask bits to disable
 284  *                      when using regulator_enable_regmap and friends APIs.
 285  * @bypass_reg: Register for control when using regmap set_bypass
 286  * @bypass_mask: Mask for control when using regmap set_bypass
 287  * @bypass_val_on: Enabling value for control when using regmap set_bypass
 288  * @bypass_val_off: Disabling value for control when using regmap set_bypass
 289  * @active_discharge_off: Enabling value for control when using regmap
 290  *                        set_active_discharge
 291  * @active_discharge_on: Disabling value for control when using regmap
 292  *                       set_active_discharge
 293  * @active_discharge_mask: Mask for control when using regmap
 294  *                         set_active_discharge
 295  * @active_discharge_reg: Register for control when using regmap
 296  *                        set_active_discharge
 297  * @soft_start_reg: Register for control when using regmap set_soft_start
 298  * @soft_start_mask: Mask for control when using regmap set_soft_start
 299  * @soft_start_val_on: Enabling value for control when using regmap
 300  *                     set_soft_start
 301  * @pull_down_reg: Register for control when using regmap set_pull_down
 302  * @pull_down_mask: Mask for control when using regmap set_pull_down
 303  * @pull_down_val_on: Enabling value for control when using regmap
 304  *                     set_pull_down
 305  *
 306  * @enable_time: Time taken for initial enable of regulator (in uS).
 307  * @off_on_delay: guard time (in uS), before re-enabling a regulator
 308  *
 309  * @of_map_mode: Maps a hardware mode defined in a DeviceTree to a standard mode
 310  */
 311 struct regulator_desc {
 312         const char *name;
 313         const char *supply_name;
 314         const char *of_match;
 315         const char *regulators_node;
 316         int (*of_parse_cb)(struct device_node *,
 317                             const struct regulator_desc *,
 318                             struct regulator_config *);
 319         int id;
 320         unsigned int continuous_voltage_range:1;
 321         unsigned n_voltages;
 322         const struct regulator_ops *ops;
 323         int irq;
 324         enum regulator_type type;
 325         struct module *owner;
 326
 327         unsigned int min_uV;
 328         unsigned int uV_step;
 329         unsigned int linear_min_sel;
 330         int fixed_uV;
 331         unsigned int ramp_delay;
 332         int min_dropout_uV;
 333
 334         const struct regulator_linear_range *linear_ranges;
 335         int n_linear_ranges;
 336
 337         const unsigned int *volt_table;
 338
 339         unsigned int vsel_reg;
 340         unsigned int vsel_mask;
 341         unsigned int csel_reg;
 342         unsigned int csel_mask;
 343         unsigned int apply_reg;
 344         unsigned int apply_bit;
 345         unsigned int enable_reg;
 346         unsigned int enable_mask;
 347         unsigned int enable_val;
 348         unsigned int disable_val;
 349         bool enable_is_inverted;
 350         unsigned int bypass_reg;
 351         unsigned int bypass_mask;
 352         unsigned int bypass_val_on;
 353         unsigned int bypass_val_off;
 354         unsigned int active_discharge_on;
 355         unsigned int active_discharge_off;
 356         unsigned int active_discharge_mask;
 357         unsigned int active_discharge_reg;
 358         unsigned int soft_start_reg;
 359         unsigned int soft_start_mask;
 360         unsigned int soft_start_val_on;
 361         unsigned int pull_down_reg;
 362         unsigned int pull_down_mask;
 363         unsigned int pull_down_val_on;
 364
 365         unsigned int enable_time;
 366
 367         unsigned int off_on_delay;
 368
 369         unsigned int (*of_map_mode)(unsigned int mode);
 370 };
 371
 372 /**
 373  * struct regulator_config - Dynamic regulator descriptor
 374  *
 375  * Each regulator registered with the core is described with a
 376  * structure of this type and a struct regulator_desc.  This structure
 377  * contains the runtime variable parts of the regulator description.
 378  *
 379  * @dev: struct device for the regulator
 380  * @init_data: platform provided init data, passed through by driver
 381  * @driver_data: private regulator data
 382  * @of_node: OpenFirmware node to parse for device tree bindings (may be
 383  *           NULL).
 384  * @regmap: regmap to use for core regmap helpers if dev_get_regmap() is
 385  *          insufficient.
 386  * @ena_gpio_initialized: GPIO controlling regulator enable was properly
 387  *                        initialized, meaning that >= 0 is a valid gpio
 388  *                        identifier and < 0 is a non existent gpio.
 389  * @ena_gpio: GPIO controlling regulator enable.
 390  * @ena_gpio_invert: Sense for GPIO enable control.
 391  * @ena_gpio_flags: Flags to use when calling gpio_request_one()
 392  */
 393 struct regulator_config {
 394         struct device *dev;
 395         const struct regulator_init_data *init_data;
 396         void *driver_data;
 397         struct device_node *of_node;
 398         struct regmap *regmap;
 399
 400         bool ena_gpio_initialized;
 401         int ena_gpio;
 402         unsigned int ena_gpio_invert:1;
 403         unsigned int ena_gpio_flags;
 404 };
 405
 406 /*
 407  * struct regulator_dev
 408  *
 409  * Voltage / Current regulator class device. One for each
 410  * regulator.
 411  *
 412  * This should *not* be used directly by anything except the regulator
 413  * core and notification injection (which should take the mutex and do
 414  * no other direct access).
 415  */
 416 struct regulator_dev {
 417         const struct regulator_desc *desc;
 418         int exclusive;
 419         u32 use_count;
 420         u32 open_count;
 421         u32 bypass_count;
 422
 423         /* lists we belong to */
 424         struct list_head list; /* list of all regulators */
 425
 426         /* lists we own */
 427         struct list_head consumer_list; /* consumers we supply */
 428
 429         struct blocking_notifier_head notifier;
 430         struct mutex mutex; /* consumer lock */
 431         struct module *owner;
 432         struct device dev;
 433         struct regulation_constraints *constraints;
 434         struct regulator *supply;       /* for tree */
 435         const char *supply_name;
 436         struct regmap *regmap;
 437
 438         struct delayed_work disable_work;
 439         int deferred_disables;
 440
 441         void *reg_data;         /* regulator_dev data */
 442
 443         struct dentry *debugfs;
 444
 445         struct regulator_enable_gpio *ena_pin;
 446         unsigned int ena_gpio_state:1;
 447
 448         unsigned int is_switch:1;
 449
 450         /* time when this regulator was disabled last time */
 451         unsigned long last_off_jiffy;
 452 };
 453
 454 struct regulator_dev *
 455 regulator_register(const struct regulator_desc *regulator_desc,
 456                    const struct regulator_config *config);
 457 struct regulator_dev *
 458 devm_regulator_register(struct device *dev,
 459                         const struct regulator_desc *regulator_desc,
 460                         const struct regulator_config *config);
 461 void regulator_unregister(struct regulator_dev *rdev);
 462 void devm_regulator_unregister(struct device *dev, struct regulator_dev *rdev);
 463
 464 int regulator_notifier_call_chain(struct regulator_dev *rdev,
 465                                   unsigned long event, void *data);
 466
 467 void *rdev_get_drvdata(struct regulator_dev *rdev);
 468 struct device *rdev_get_dev(struct regulator_dev *rdev);
 469 int rdev_get_id(struct regulator_dev *rdev);
 470
 471 int regulator_mode_to_status(unsigned int);
 472
 473 int regulator_list_voltage_linear(struct regulator_dev *rdev,
 474                                   unsigned int selector);
 475 int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
 476                                         unsigned int selector);
 477 int regulator_list_voltage_table(struct regulator_dev *rdev,
 478                                   unsigned int selector);
 479 int regulator_map_voltage_linear(struct regulator_dev *rdev,
 480                                   int min_uV, int max_uV);
 481 int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
 482                                        int min_uV, int max_uV);
 483 int regulator_map_voltage_iterate(struct regulator_dev *rdev,
 484                                   int min_uV, int max_uV);
 485 int regulator_map_voltage_ascend(struct regulator_dev *rdev,
 486                                   int min_uV, int max_uV);
 487 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev);
 488 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel);
 489 int regulator_is_enabled_regmap(struct regulator_dev *rdev);
 490 int regulator_enable_regmap(struct regulator_dev *rdev);
 491 int regulator_disable_regmap(struct regulator_dev *rdev);
 492 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
 493                                    unsigned int old_selector,
 494                                    unsigned int new_selector);
 495 int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable);
 496 int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable);
 497 int regulator_set_soft_start_regmap(struct regulator_dev *rdev);
 498 int regulator_set_pull_down_regmap(struct regulator_dev *rdev);
 499
 500 int regulator_set_active_discharge_regmap(struct regulator_dev *rdev,
 501                                           bool enable);
 502 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);
 503
 504 #endif