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  *
  95  * @set_mode: Set the configured operating mode for the regulator.
  96  * @get_mode: Get the configured operating mode for the regulator.
  97  * @get_status: Return actual (not as-configured) status of regulator, as a
  98  *      REGULATOR_STATUS value (or negative errno)
  99  * @get_optimum_mode: Get the most efficient operating mode for the regulator
 100  *                    when running with the specified parameters.
 101  *
 102  * @set_bypass: Set the regulator in bypass mode.
 103  * @get_bypass: Get the regulator bypass mode state.
 104  *
 105  * @enable_time: Time taken for the regulator voltage output voltage to
 106  *               stabilise after being enabled, in microseconds.
 107  * @set_ramp_delay: Set the ramp delay for the regulator. The driver should
 108  *              select ramp delay equal to or less than(closest) ramp_delay.
 109  * @set_voltage_time_sel: Time taken for the regulator voltage output voltage
 110  *               to stabilise after being set to a new value, in microseconds.
 111  *               The function provides the from and to voltage selector, the
 112  *               function should return the worst case.
 113  *
 114  * @set_suspend_voltage: Set the voltage for the regulator when the system
 115  *                       is suspended.
 116  * @set_suspend_enable: Mark the regulator as enabled when the system is
 117  *                      suspended.
 118  * @set_suspend_disable: Mark the regulator as disabled when the system is
 119  *                       suspended.
 120  * @set_suspend_mode: Set the operating mode for the regulator when the
 121  *                    system is suspended.
 122  *
 123  * This struct describes regulator operations which can be implemented by
 124  * regulator chip drivers.
 125  */
 126 struct regulator_ops {
 127
 128         /* enumerate supported voltages */
 129         int (*list_voltage) (struct regulator_dev *, unsigned selector);
 130
 131         /* get/set regulator voltage */
 132         int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV,
 133                             unsigned *selector);
 134         int (*map_voltage)(struct regulator_dev *, int min_uV, int max_uV);
 135         int (*set_voltage_sel) (struct regulator_dev *, unsigned selector);
 136         int (*get_voltage) (struct regulator_dev *);
 137         int (*get_voltage_sel) (struct regulator_dev *);
 138
 139         /* get/set regulator current  */
 140         int (*set_current_limit) (struct regulator_dev *,
 141                                  int min_uA, int max_uA);
 142         int (*get_current_limit) (struct regulator_dev *);
 143
 144         /* enable/disable regulator */
 145         int (*enable) (struct regulator_dev *);
 146         int (*disable) (struct regulator_dev *);
 147         int (*is_enabled) (struct regulator_dev *);
 148
 149         /* get/set regulator operating mode (defined in consumer.h) */
 150         int (*set_mode) (struct regulator_dev *, unsigned int mode);
 151         unsigned int (*get_mode) (struct regulator_dev *);
 152
 153         /* Time taken to enable or set voltage on the regulator */
 154         int (*enable_time) (struct regulator_dev *);
 155         int (*set_ramp_delay) (struct regulator_dev *, int ramp_delay);
 156         int (*set_voltage_time_sel) (struct regulator_dev *,
 157                                      unsigned int old_selector,
 158                                      unsigned int new_selector);
 159
 160         /* report regulator status ... most other accessors report
 161          * control inputs, this reports results of combining inputs
 162          * from Linux (and other sources) with the actual load.
 163          * returns REGULATOR_STATUS_* or negative errno.
 164          */
 165         int (*get_status)(struct regulator_dev *);
 166
 167         /* get most efficient regulator operating mode for load */
 168         unsigned int (*get_optimum_mode) (struct regulator_dev *, int input_uV,
 169                                           int output_uV, int load_uA);
 170
 171         /* control and report on bypass mode */
 172         int (*set_bypass)(struct regulator_dev *dev, bool enable);
 173         int (*get_bypass)(struct regulator_dev *dev, bool *enable);
 174
 175         /* the operations below are for configuration of regulator state when
 176          * its parent PMIC enters a global STANDBY/HIBERNATE state */
 177
 178         /* set regulator suspend voltage */
 179         int (*set_suspend_voltage) (struct regulator_dev *, int uV);
 180
 181         /* enable/disable regulator in suspend state */
 182         int (*set_suspend_enable) (struct regulator_dev *);
 183         int (*set_suspend_disable) (struct regulator_dev *);
 184
 185         /* set regulator suspend operating mode (defined in consumer.h) */
 186         int (*set_suspend_mode) (struct regulator_dev *, unsigned int mode);
 187 };
 188
 189 /*
 190  * Regulators can either control voltage or current.
 191  */
 192 enum regulator_type {
 193         REGULATOR_VOLTAGE,
 194         REGULATOR_CURRENT,
 195 };
 196
 197 /**
 198  * struct regulator_desc - Static regulator descriptor
 199  *
 200  * Each regulator registered with the core is described with a
 201  * structure of this type and a struct regulator_config.  This
 202  * structure contains the non-varying parts of the regulator
 203  * description.
 204  *
 205  * @name: Identifying name for the regulator.
 206  * @supply_name: Identifying the regulator supply
 207  * @of_match: Name used to identify regulator in DT.
 208  * @regulators_node: Name of node containing regulator definitions in DT.
 209  * @of_parse_cb: Optional callback called only if of_match is present.
 210  *               Will be called for each regulator parsed from DT, during
 211  *               init_data parsing.
 212  *               The regulator_config passed as argument to the callback will
 213  *               be a copy of config passed to regulator_register, valid only
 214  *               for this particular call. Callback may freely change the
 215  *               config but it cannot store it for later usage.
 216  *               Callback should return 0 on success or negative ERRNO
 217  *               indicating failure.
 218  * @id: Numerical identifier for the regulator.
 219  * @ops: Regulator operations table.
 220  * @irq: Interrupt number for the regulator.
 221  * @type: Indicates if the regulator is a voltage or current regulator.
 222  * @owner: Module providing the regulator, used for refcounting.
 223  *
 224  * @continuous_voltage_range: Indicates if the regulator can set any
 225  *                            voltage within constrains range.
 226  * @n_voltages: Number of selectors available for ops.list_voltage().
 227  *
 228  * @min_uV: Voltage given by the lowest selector (if linear mapping)
 229  * @uV_step: Voltage increase with each selector (if linear mapping)
 230  * @linear_min_sel: Minimal selector for starting linear mapping
 231  * @fixed_uV: Fixed voltage of rails.
 232  * @ramp_delay: Time to settle down after voltage change (unit: uV/us)
 233  * @linear_ranges: A constant table of possible voltage ranges.
 234  * @n_linear_ranges: Number of entries in the @linear_ranges table.
 235  * @volt_table: Voltage mapping table (if table based mapping)
 236  *
 237  * @vsel_reg: Register for selector when using regulator_regmap_X_voltage_
 238  * @vsel_mask: Mask for register bitfield used for selector
 239  * @apply_reg: Register for initiate voltage change on the output when
 240  *                using regulator_set_voltage_sel_regmap
 241  * @apply_bit: Register bitfield used for initiate voltage change on the
 242  *                output when using regulator_set_voltage_sel_regmap
 243  * @enable_reg: Register for control when using regmap enable/disable ops
 244  * @enable_mask: Mask for control when using regmap enable/disable ops
 245  * @enable_val: Enabling value for control when using regmap enable/disable ops
 246  * @disable_val: Disabling value for control when using regmap enable/disable ops
 247  * @enable_is_inverted: A flag to indicate set enable_mask bits to disable
 248  *                      when using regulator_enable_regmap and friends APIs.
 249  * @bypass_reg: Register for control when using regmap set_bypass
 250  * @bypass_mask: Mask for control when using regmap set_bypass
 251  * @bypass_val_on: Enabling value for control when using regmap set_bypass
 252  * @bypass_val_off: Disabling value for control when using regmap set_bypass
 253  *
 254  * @enable_time: Time taken for initial enable of regulator (in uS).
 255  * @off_on_delay: guard time (in uS), before re-enabling a regulator
 256  *
 257  * @of_map_mode: Maps a hardware mode defined in a DeviceTree to a standard mode
 258  */
 259 struct regulator_desc {
 260         const char *name;
 261         const char *supply_name;
 262         const char *of_match;
 263         const char *regulators_node;
 264         int (*of_parse_cb)(struct device_node *,
 265                             const struct regulator_desc *,
 266                             struct regulator_config *);
 267         int id;
 268         bool continuous_voltage_range;
 269         unsigned n_voltages;
 270         const struct regulator_ops *ops;
 271         int irq;
 272         enum regulator_type type;
 273         struct module *owner;
 274
 275         unsigned int min_uV;
 276         unsigned int uV_step;
 277         unsigned int linear_min_sel;
 278         int fixed_uV;
 279         unsigned int ramp_delay;
 280
 281         const struct regulator_linear_range *linear_ranges;
 282         int n_linear_ranges;
 283
 284         const unsigned int *volt_table;
 285
 286         unsigned int vsel_reg;
 287         unsigned int vsel_mask;
 288         unsigned int apply_reg;
 289         unsigned int apply_bit;
 290         unsigned int enable_reg;
 291         unsigned int enable_mask;
 292         unsigned int enable_val;
 293         unsigned int disable_val;
 294         bool enable_is_inverted;
 295         unsigned int bypass_reg;
 296         unsigned int bypass_mask;
 297         unsigned int bypass_val_on;
 298         unsigned int bypass_val_off;
 299
 300         unsigned int enable_time;
 301
 302         unsigned int off_on_delay;
 303
 304         unsigned int (*of_map_mode)(unsigned int mode);
 305 };
 306
 307 /**
 308  * struct regulator_config - Dynamic regulator descriptor
 309  *
 310  * Each regulator registered with the core is described with a
 311  * structure of this type and a struct regulator_desc.  This structure
 312  * contains the runtime variable parts of the regulator description.
 313  *
 314  * @dev: struct device for the regulator
 315  * @init_data: platform provided init data, passed through by driver
 316  * @driver_data: private regulator data
 317  * @of_node: OpenFirmware node to parse for device tree bindings (may be
 318  *           NULL).
 319  * @regmap: regmap to use for core regmap helpers if dev_get_regmap() is
 320  *          insufficient.
 321  * @ena_gpio_initialized: GPIO controlling regulator enable was properly
 322  *                        initialized, meaning that >= 0 is a valid gpio
 323  *                        identifier and < 0 is a non existent gpio.
 324  * @ena_gpio: GPIO controlling regulator enable.
 325  * @ena_gpio_invert: Sense for GPIO enable control.
 326  * @ena_gpio_flags: Flags to use when calling gpio_request_one()
 327  */
 328 struct regulator_config {
 329         struct device *dev;
 330         const struct regulator_init_data *init_data;
 331         void *driver_data;
 332         struct device_node *of_node;
 333         struct regmap *regmap;
 334
 335         bool ena_gpio_initialized;
 336         int ena_gpio;
 337         unsigned int ena_gpio_invert:1;
 338         unsigned int ena_gpio_flags;
 339 };
 340
 341 /*
 342  * struct regulator_dev
 343  *
 344  * Voltage / Current regulator class device. One for each
 345  * regulator.
 346  *
 347  * This should *not* be used directly by anything except the regulator
 348  * core and notification injection (which should take the mutex and do
 349  * no other direct access).
 350  */
 351 struct regulator_dev {
 352         const struct regulator_desc *desc;
 353         int exclusive;
 354         u32 use_count;
 355         u32 open_count;
 356         u32 bypass_count;
 357
 358         /* lists we belong to */
 359         struct list_head list; /* list of all regulators */
 360
 361         /* lists we own */
 362         struct list_head consumer_list; /* consumers we supply */
 363
 364         struct blocking_notifier_head notifier;
 365         struct mutex mutex; /* consumer lock */
 366         struct module *owner;
 367         struct device dev;
 368         struct regulation_constraints *constraints;
 369         struct regulator *supply;       /* for tree */
 370         struct regmap *regmap;
 371
 372         struct delayed_work disable_work;
 373         int deferred_disables;
 374
 375         void *reg_data;         /* regulator_dev data */
 376
 377         struct dentry *debugfs;
 378
 379         struct regulator_enable_gpio *ena_pin;
 380         unsigned int ena_gpio_state:1;
 381
 382         /* time when this regulator was disabled last time */
 383         unsigned long last_off_jiffy;
 384 };
 385
 386 struct regulator_dev *
 387 regulator_register(const struct regulator_desc *regulator_desc,
 388                    const struct regulator_config *config);
 389 struct regulator_dev *
 390 devm_regulator_register(struct device *dev,
 391                         const struct regulator_desc *regulator_desc,
 392                         const struct regulator_config *config);
 393 void regulator_unregister(struct regulator_dev *rdev);
 394 void devm_regulator_unregister(struct device *dev, struct regulator_dev *rdev);
 395
 396 int regulator_notifier_call_chain(struct regulator_dev *rdev,
 397                                   unsigned long event, void *data);
 398
 399 void *rdev_get_drvdata(struct regulator_dev *rdev);
 400 struct device *rdev_get_dev(struct regulator_dev *rdev);
 401 int rdev_get_id(struct regulator_dev *rdev);
 402
 403 int regulator_mode_to_status(unsigned int);
 404
 405 int regulator_list_voltage_linear(struct regulator_dev *rdev,
 406                                   unsigned int selector);
 407 int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
 408                                         unsigned int selector);
 409 int regulator_list_voltage_table(struct regulator_dev *rdev,
 410                                   unsigned int selector);
 411 int regulator_map_voltage_linear(struct regulator_dev *rdev,
 412                                   int min_uV, int max_uV);
 413 int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
 414                                        int min_uV, int max_uV);
 415 int regulator_map_voltage_iterate(struct regulator_dev *rdev,
 416                                   int min_uV, int max_uV);
 417 int regulator_map_voltage_ascend(struct regulator_dev *rdev,
 418                                   int min_uV, int max_uV);
 419 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev);
 420 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel);
 421 int regulator_is_enabled_regmap(struct regulator_dev *rdev);
 422 int regulator_enable_regmap(struct regulator_dev *rdev);
 423 int regulator_disable_regmap(struct regulator_dev *rdev);
 424 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
 425                                    unsigned int old_selector,
 426                                    unsigned int new_selector);
 427 int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable);
 428 int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable);
 429
 430 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);
 431
 432 #endif