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_init_data;
  25 struct regulator_enable_gpio;
  26
  27 enum 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  * Specify a range of voltages for regulator_map_linar_range() and
  44  * regulator_list_linear_range().
  45  *
  46  * @min_uV:  Lowest voltage in range
  47  * @max_uV:  Highest voltage in range
  48  * @min_sel: Lowest selector for range
  49  * @max_sel: Highest selector for range
  50  * @uV_step: Step size
  51  */
  52 struct regulator_linear_range {
  53         unsigned int min_uV;
  54         unsigned int max_uV;
  55         unsigned int min_sel;
  56         unsigned int max_sel;
  57         unsigned int uV_step;
  58 };
  59
  60 /**
  61  * struct regulator_ops - regulator operations.
  62  *
  63  * @enable: Configure the regulator as enabled.
  64  * @disable: Configure the regulator as disabled.
  65  * @is_enabled: Return 1 if the regulator is enabled, 0 if not.
  66  *              May also return negative errno.
  67  *
  68  * @set_voltage: Set the voltage for the regulator within the range specified.
  69  *               The driver should select the voltage closest to min_uV.
  70  * @set_voltage_sel: Set the voltage for the regulator using the specified
  71  *                   selector.
  72  * @map_voltage: Convert a voltage into a selector
  73  * @get_voltage: Return the currently configured voltage for the regulator.
  74  * @get_voltage_sel: Return the currently configured voltage selector for the
  75  *                   regulator.
  76  * @list_voltage: Return one of the supported voltages, in microvolts; zero
  77  *      if the selector indicates a voltage that is unusable on this system;
  78  *      or negative errno.  Selectors range from zero to one less than
  79  *      regulator_desc.n_voltages.  Voltages may be reported in any order.
  80  *
  81  * @set_current_limit: Configure a limit for a current-limited regulator.
  82  *                     The driver should select the current closest to max_uA.
  83  * @get_current_limit: Get the configured limit for a current-limited regulator.
  84  *
  85  * @set_mode: Set the configured operating mode for the regulator.
  86  * @get_mode: Get the configured operating mode for the regulator.
  87  * @get_status: Return actual (not as-configured) status of regulator, as a
  88  *      REGULATOR_STATUS value (or negative errno)
  89  * @get_optimum_mode: Get the most efficient operating mode for the regulator
  90  *                    when running with the specified parameters.
  91  *
  92  * @set_bypass: Set the regulator in bypass mode.
  93  * @get_bypass: Get the regulator bypass mode state.
  94  *
  95  * @enable_time: Time taken for the regulator voltage output voltage to
  96  *               stabilise after being enabled, in microseconds.
  97  * @set_ramp_delay: Set the ramp delay for the regulator. The driver should
  98  *              select ramp delay equal to or less than(closest) ramp_delay.
  99  * @set_voltage_time_sel: Time taken for the regulator voltage output voltage
 100  *               to stabilise after being set to a new value, in microseconds.
 101  *               The function provides the from and to voltage selector, the
 102  *               function should return the worst case.
 103  *
 104  * @set_suspend_voltage: Set the voltage for the regulator when the system
 105  *                       is suspended.
 106  * @set_suspend_enable: Mark the regulator as enabled when the system is
 107  *                      suspended.
 108  * @set_suspend_disable: Mark the regulator as disabled when the system is
 109  *                       suspended.
 110  * @set_suspend_mode: Set the operating mode for the regulator when the
 111  *                    system is suspended.
 112  *
 113  * This struct describes regulator operations which can be implemented by
 114  * regulator chip drivers.
 115  */
 116 struct regulator_ops {
 117
 118         /* enumerate supported voltages */
 119         int (*list_voltage) (struct regulator_dev *, unsigned selector);
 120
 121         /* get/set regulator voltage */
 122         int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV,
 123                             unsigned *selector);
 124         int (*map_voltage)(struct regulator_dev *, int min_uV, int max_uV);
 125         int (*set_voltage_sel) (struct regulator_dev *, unsigned selector);
 126         int (*get_voltage) (struct regulator_dev *);
 127         int (*get_voltage_sel) (struct regulator_dev *);
 128
 129         /* get/set regulator current  */
 130         int (*set_current_limit) (struct regulator_dev *,
 131                                  int min_uA, int max_uA);
 132         int (*get_current_limit) (struct regulator_dev *);
 133
 134         /* enable/disable regulator */
 135         int (*enable) (struct regulator_dev *);
 136         int (*disable) (struct regulator_dev *);
 137         int (*is_enabled) (struct regulator_dev *);
 138
 139         /* get/set regulator operating mode (defined in consumer.h) */
 140         int (*set_mode) (struct regulator_dev *, unsigned int mode);
 141         unsigned int (*get_mode) (struct regulator_dev *);
 142
 143         /* Time taken to enable or set voltage on the regulator */
 144         int (*enable_time) (struct regulator_dev *);
 145         int (*set_ramp_delay) (struct regulator_dev *, int ramp_delay);
 146         int (*set_voltage_time_sel) (struct regulator_dev *,
 147                                      unsigned int old_selector,
 148                                      unsigned int new_selector);
 149
 150         /* report regulator status ... most other accessors report
 151          * control inputs, this reports results of combining inputs
 152          * from Linux (and other sources) with the actual load.
 153          * returns REGULATOR_STATUS_* or negative errno.
 154          */
 155         int (*get_status)(struct regulator_dev *);
 156
 157         /* get most efficient regulator operating mode for load */
 158         unsigned int (*get_optimum_mode) (struct regulator_dev *, int input_uV,
 159                                           int output_uV, int load_uA);
 160
 161         /* control and report on bypass mode */
 162         int (*set_bypass)(struct regulator_dev *dev, bool enable);
 163         int (*get_bypass)(struct regulator_dev *dev, bool *enable);
 164
 165         /* the operations below are for configuration of regulator state when
 166          * its parent PMIC enters a global STANDBY/HIBERNATE state */
 167
 168         /* set regulator suspend voltage */
 169         int (*set_suspend_voltage) (struct regulator_dev *, int uV);
 170
 171         /* enable/disable regulator in suspend state */
 172         int (*set_suspend_enable) (struct regulator_dev *);
 173         int (*set_suspend_disable) (struct regulator_dev *);
 174
 175         /* set regulator suspend operating mode (defined in consumer.h) */
 176         int (*set_suspend_mode) (struct regulator_dev *, unsigned int mode);
 177 };
 178
 179 /*
 180  * Regulators can either control voltage or current.
 181  */
 182 enum regulator_type {
 183         REGULATOR_VOLTAGE,
 184         REGULATOR_CURRENT,
 185 };
 186
 187 /**
 188  * struct regulator_desc - Static regulator descriptor
 189  *
 190  * Each regulator registered with the core is described with a
 191  * structure of this type and a struct regulator_config.  This
 192  * structure contains the non-varying parts of the regulator
 193  * description.
 194  *
 195  * @name: Identifying name for the regulator.
 196  * @supply_name: Identifying the regulator supply
 197  * @id: Numerical identifier for the regulator.
 198  * @ops: Regulator operations table.
 199  * @irq: Interrupt number for the regulator.
 200  * @type: Indicates if the regulator is a voltage or current regulator.
 201  * @owner: Module providing the regulator, used for refcounting.
 202  *
 203  * @continuous_voltage_range: Indicates if the regulator can set any
 204  *                            voltage within constrains range.
 205  * @n_voltages: Number of selectors available for ops.list_voltage().
 206  *
 207  * @min_uV: Voltage given by the lowest selector (if linear mapping)
 208  * @uV_step: Voltage increase with each selector (if linear mapping)
 209  * @linear_min_sel: Minimal selector for starting linear mapping
 210  * @ramp_delay: Time to settle down after voltage change (unit: uV/us)
 211  * @volt_table: Voltage mapping table (if table based mapping)
 212  *
 213  * @vsel_reg: Register for selector when using regulator_regmap_X_voltage_
 214  * @vsel_mask: Mask for register bitfield used for selector
 215  * @apply_reg: Register for initiate voltage change on the output when
 216  *                using regulator_set_voltage_sel_regmap
 217  * @apply_bit: Register bitfield used for initiate voltage change on the
 218  *                output when using regulator_set_voltage_sel_regmap
 219  * @enable_reg: Register for control when using regmap enable/disable ops
 220  * @enable_mask: Mask for control when using regmap enable/disable ops
 221  * @enable_is_inverted: A flag to indicate set enable_mask bits to disable
 222  *                      when using regulator_enable_regmap and friends APIs.
 223  * @bypass_reg: Register for control when using regmap set_bypass
 224  * @bypass_mask: Mask for control when using regmap set_bypass
 225  *
 226  * @enable_time: Time taken for initial enable of regulator (in uS).
 227  */
 228 struct regulator_desc {
 229         const char *name;
 230         const char *supply_name;
 231         int id;
 232         bool continuous_voltage_range;
 233         unsigned n_voltages;
 234         struct regulator_ops *ops;
 235         int irq;
 236         enum regulator_type type;
 237         struct module *owner;
 238
 239         unsigned int min_uV;
 240         unsigned int uV_step;
 241         unsigned int linear_min_sel;
 242         unsigned int ramp_delay;
 243
 244         const struct regulator_linear_range *linear_ranges;
 245         int n_linear_ranges;
 246
 247         const unsigned int *volt_table;
 248
 249         unsigned int vsel_reg;
 250         unsigned int vsel_mask;
 251         unsigned int apply_reg;
 252         unsigned int apply_bit;
 253         unsigned int enable_reg;
 254         unsigned int enable_mask;
 255         bool enable_is_inverted;
 256         unsigned int bypass_reg;
 257         unsigned int bypass_mask;
 258
 259         unsigned int enable_time;
 260 };
 261
 262 /**
 263  * struct regulator_config - Dynamic regulator descriptor
 264  *
 265  * Each regulator registered with the core is described with a
 266  * structure of this type and a struct regulator_desc.  This structure
 267  * contains the runtime variable parts of the regulator description.
 268  *
 269  * @dev: struct device for the regulator
 270  * @init_data: platform provided init data, passed through by driver
 271  * @driver_data: private regulator data
 272  * @of_node: OpenFirmware node to parse for device tree bindings (may be
 273  *           NULL).
 274  * @regmap: regmap to use for core regmap helpers if dev_get_regulator() is
 275  *          insufficient.
 276  * @ena_gpio: GPIO controlling regulator enable.
 277  * @ena_gpio_invert: Sense for GPIO enable control.
 278  * @ena_gpio_flags: Flags to use when calling gpio_request_one()
 279  */
 280 struct regulator_config {
 281         struct device *dev;
 282         const struct regulator_init_data *init_data;
 283         void *driver_data;
 284         struct device_node *of_node;
 285         struct regmap *regmap;
 286
 287         int ena_gpio;
 288         unsigned int ena_gpio_invert:1;
 289         unsigned int ena_gpio_flags;
 290 };
 291
 292 /*
 293  * struct regulator_dev
 294  *
 295  * Voltage / Current regulator class device. One for each
 296  * regulator.
 297  *
 298  * This should *not* be used directly by anything except the regulator
 299  * core and notification injection (which should take the mutex and do
 300  * no other direct access).
 301  */
 302 struct regulator_dev {
 303         const struct regulator_desc *desc;
 304         int exclusive;
 305         u32 use_count;
 306         u32 open_count;
 307         u32 bypass_count;
 308
 309         /* lists we belong to */
 310         struct list_head list; /* list of all regulators */
 311
 312         /* lists we own */
 313         struct list_head consumer_list; /* consumers we supply */
 314
 315         struct blocking_notifier_head notifier;
 316         struct mutex mutex; /* consumer lock */
 317         struct module *owner;
 318         struct device dev;
 319         struct regulation_constraints *constraints;
 320         struct regulator *supply;       /* for tree */
 321         struct regmap *regmap;
 322
 323         struct delayed_work disable_work;
 324         int deferred_disables;
 325
 326         void *reg_data;         /* regulator_dev data */
 327
 328         struct dentry *debugfs;
 329
 330         struct regulator_enable_gpio *ena_pin;
 331         unsigned int ena_gpio_state:1;
 332 };
 333
 334 struct regulator_dev *
 335 regulator_register(const struct regulator_desc *regulator_desc,
 336                    const struct regulator_config *config);
 337 void regulator_unregister(struct regulator_dev *rdev);
 338
 339 int regulator_notifier_call_chain(struct regulator_dev *rdev,
 340                                   unsigned long event, void *data);
 341
 342 void *rdev_get_drvdata(struct regulator_dev *rdev);
 343 struct device *rdev_get_dev(struct regulator_dev *rdev);
 344 int rdev_get_id(struct regulator_dev *rdev);
 345
 346 int regulator_mode_to_status(unsigned int);
 347
 348 int regulator_list_voltage_linear(struct regulator_dev *rdev,
 349                                   unsigned int selector);
 350 int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
 351                                         unsigned int selector);
 352 int regulator_list_voltage_table(struct regulator_dev *rdev,
 353                                   unsigned int selector);
 354 int regulator_map_voltage_linear(struct regulator_dev *rdev,
 355                                   int min_uV, int max_uV);
 356 int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
 357                                        int min_uV, int max_uV);
 358 int regulator_map_voltage_iterate(struct regulator_dev *rdev,
 359                                   int min_uV, int max_uV);
 360 int regulator_map_voltage_ascend(struct regulator_dev *rdev,
 361                                   int min_uV, int max_uV);
 362 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev);
 363 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel);
 364 int regulator_is_enabled_regmap(struct regulator_dev *rdev);
 365 int regulator_enable_regmap(struct regulator_dev *rdev);
 366 int regulator_disable_regmap(struct regulator_dev *rdev);
 367 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
 368                                    unsigned int old_selector,
 369                                    unsigned int new_selector);
 370 int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable);
 371 int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable);
 372
 373 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);
 374
 375 #endif