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/regulator/consumer.h>
  20
  21 struct regulator_dev;
  22 struct regulator_init_data;
  23
  24 enum regulator_status {
  25         REGULATOR_STATUS_OFF,
  26         REGULATOR_STATUS_ON,
  27         REGULATOR_STATUS_ERROR,
  28         /* fast/normal/idle/standby are flavors of "on" */
  29         REGULATOR_STATUS_FAST,
  30         REGULATOR_STATUS_NORMAL,
  31         REGULATOR_STATUS_IDLE,
  32         REGULATOR_STATUS_STANDBY,
  33 };
  34
  35 /**
  36  * struct regulator_ops - regulator operations.
  37  *
  38  * @enable: Configure the regulator as enabled.
  39  * @disable: Configure the regulator as disabled.
  40  * @is_enabled: Return 1 if the regulator is enabled, 0 if not.
  41  *              May also return negative errno.
  42  *
  43  * @set_voltage: Set the voltage for the regulator within the range specified.
  44  *               The driver should select the voltage closest to min_uV.
  45  * @set_voltage_sel: Set the voltage for the regulator using the specified
  46  *                   selector.
  47  * @get_voltage: Return the currently configured voltage for the regulator.
  48  * @get_voltage_sel: Return the currently configured voltage selector for the
  49  *                   regulator.
  50  * @list_voltage: Return one of the supported voltages, in microvolts; zero
  51  *      if the selector indicates a voltage that is unusable on this system;
  52  *      or negative errno.  Selectors range from zero to one less than
  53  *      regulator_desc.n_voltages.  Voltages may be reported in any order.
  54  *
  55  * @set_current_limit: Configure a limit for a current-limited regulator.
  56  * @get_current_limit: Get the configured limit for a current-limited regulator.
  57  *
  58  * @set_mode: Set the configured operating mode for the regulator.
  59  * @get_mode: Get the configured operating mode for the regulator.
  60  * @get_status: Return actual (not as-configured) status of regulator, as a
  61  *      REGULATOR_STATUS value (or negative errno)
  62  * @get_optimum_mode: Get the most efficient operating mode for the regulator
  63  *                    when running with the specified parameters.
  64  *
  65  * @enable_time: Time taken for the regulator voltage output voltage to
  66  *               stabilise after being enabled, in microseconds.
  67  * @set_voltage_time_sel: Time taken for the regulator voltage output voltage
  68  *               to stabilise after being set to a new value, in microseconds.
  69  *               The function provides the from and to voltage selector, the
  70  *               function should return the worst case.
  71  *
  72  * @set_suspend_voltage: Set the voltage for the regulator when the system
  73  *                       is suspended.
  74  * @set_suspend_enable: Mark the regulator as enabled when the system is
  75  *                      suspended.
  76  * @set_suspend_disable: Mark the regulator as disabled when the system is
  77  *                       suspended.
  78  * @set_suspend_mode: Set the operating mode for the regulator when the
  79  *                    system is suspended.
  80  *
  81  * This struct describes regulator operations which can be implemented by
  82  * regulator chip drivers.
  83  */
  84 struct regulator_ops {
  85
  86         /* enumerate supported voltages */
  87         int (*list_voltage) (struct regulator_dev *, unsigned selector);
  88
  89         /* get/set regulator voltage */
  90         int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV,
  91                             unsigned *selector);
  92         int (*set_voltage_sel) (struct regulator_dev *, unsigned selector);
  93         int (*get_voltage) (struct regulator_dev *);
  94         int (*get_voltage_sel) (struct regulator_dev *);
  95
  96         /* get/set regulator current  */
  97         int (*set_current_limit) (struct regulator_dev *,
  98                                  int min_uA, int max_uA);
  99         int (*get_current_limit) (struct regulator_dev *);
 100
 101         /* enable/disable regulator */
 102         int (*enable) (struct regulator_dev *);
 103         int (*disable) (struct regulator_dev *);
 104         int (*is_enabled) (struct regulator_dev *);
 105
 106         /* get/set regulator operating mode (defined in regulator.h) */
 107         int (*set_mode) (struct regulator_dev *, unsigned int mode);
 108         unsigned int (*get_mode) (struct regulator_dev *);
 109
 110         /* Time taken to enable or set voltage on the regulator */
 111         int (*enable_time) (struct regulator_dev *);
 112         int (*set_voltage_time_sel) (struct regulator_dev *,
 113                                      unsigned int old_selector,
 114                                      unsigned int new_selector);
 115
 116         /* report regulator status ... most other accessors report
 117          * control inputs, this reports results of combining inputs
 118          * from Linux (and other sources) with the actual load.
 119          * returns REGULATOR_STATUS_* or negative errno.
 120          */
 121         int (*get_status)(struct regulator_dev *);
 122
 123         /* get most efficient regulator operating mode for load */
 124         unsigned int (*get_optimum_mode) (struct regulator_dev *, int input_uV,
 125                                           int output_uV, int load_uA);
 126
 127         /* the operations below are for configuration of regulator state when
 128          * its parent PMIC enters a global STANDBY/HIBERNATE state */
 129
 130         /* set regulator suspend voltage */
 131         int (*set_suspend_voltage) (struct regulator_dev *, int uV);
 132
 133         /* enable/disable regulator in suspend state */
 134         int (*set_suspend_enable) (struct regulator_dev *);
 135         int (*set_suspend_disable) (struct regulator_dev *);
 136
 137         /* set regulator suspend operating mode (defined in regulator.h) */
 138         int (*set_suspend_mode) (struct regulator_dev *, unsigned int mode);
 139 };
 140
 141 /*
 142  * Regulators can either control voltage or current.
 143  */
 144 enum regulator_type {
 145         REGULATOR_VOLTAGE,
 146         REGULATOR_CURRENT,
 147 };
 148
 149 /**
 150  * struct regulator_desc - Regulator descriptor
 151  *
 152  * Each regulator registered with the core is described with a structure of
 153  * this type.
 154  *
 155  * @name: Identifying name for the regulator.
 156  * @id: Numerical identifier for the regulator.
 157  * @n_voltages: Number of selectors available for ops.list_voltage().
 158  * @ops: Regulator operations table.
 159  * @irq: Interrupt number for the regulator.
 160  * @type: Indicates if the regulator is a voltage or current regulator.
 161  * @owner: Module providing the regulator, used for refcounting.
 162  */
 163 struct regulator_desc {
 164         const char *name;
 165         int id;
 166         unsigned n_voltages;
 167         struct regulator_ops *ops;
 168         int irq;
 169         enum regulator_type type;
 170         struct module *owner;
 171 };
 172
 173 /*
 174  * struct regulator_dev
 175  *
 176  * Voltage / Current regulator class device. One for each
 177  * regulator.
 178  *
 179  * This should *not* be used directly by anything except the regulator
 180  * core and notification injection (which should take the mutex and do
 181  * no other direct access).
 182  */
 183 struct regulator_dev {
 184         struct regulator_desc *desc;
 185         int exclusive;
 186         u32 use_count;
 187         u32 open_count;
 188
 189         /* lists we belong to */
 190         struct list_head list; /* list of all regulators */
 191         struct list_head slist; /* list of supplied regulators */
 192
 193         /* lists we own */
 194         struct list_head consumer_list; /* consumers we supply */
 195         struct list_head supply_list; /* regulators we supply */
 196
 197         struct blocking_notifier_head notifier;
 198         struct mutex mutex; /* consumer lock */
 199         struct module *owner;
 200         struct device dev;
 201         struct regulation_constraints *constraints;
 202         struct regulator_dev *supply;   /* for tree */
 203
 204         void *reg_data;         /* regulator_dev data */
 205
 206 #ifdef CONFIG_DEBUG_FS
 207         struct dentry *debugfs;
 208 #endif
 209 };
 210
 211 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
 212         struct device *dev, const struct regulator_init_data *init_data,
 213         void *driver_data);
 214 void regulator_unregister(struct regulator_dev *rdev);
 215
 216 int regulator_notifier_call_chain(struct regulator_dev *rdev,
 217                                   unsigned long event, void *data);
 218
 219 void *rdev_get_drvdata(struct regulator_dev *rdev);
 220 struct device *rdev_get_dev(struct regulator_dev *rdev);
 221 int rdev_get_id(struct regulator_dev *rdev);
 222
 223 int regulator_mode_to_status(unsigned int);
 224
 225 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);
 226
 227 #endif