230 lines
7.8 KiB
C
230 lines
7.8 KiB
C
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/*
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* driver.h -- SoC Regulator driver support.
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*
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* Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
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*
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* Author: Liam Girdwood <lrg@slimlogic.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Regulator Driver Interface.
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*/
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#ifndef __LINUX_REGULATOR_DRIVER_H_
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#define __LINUX_REGULATOR_DRIVER_H_
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#include <linux/device.h>
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#include <linux/notifier.h>
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#include <linux/regulator/consumer.h>
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struct regulator_dev;
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struct regulator_init_data;
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enum regulator_status {
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REGULATOR_STATUS_OFF,
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REGULATOR_STATUS_ON,
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REGULATOR_STATUS_ERROR,
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/* fast/normal/idle/standby are flavors of "on" */
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REGULATOR_STATUS_FAST,
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REGULATOR_STATUS_NORMAL,
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REGULATOR_STATUS_IDLE,
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REGULATOR_STATUS_STANDBY,
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};
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/**
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* struct regulator_ops - regulator operations.
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*
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* @enable: Configure the regulator as enabled.
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* @disable: Configure the regulator as disabled.
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* @is_enabled: Return 1 if the regulator is enabled, 0 if not.
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* May also return negative errno.
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*
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* @set_voltage: Set the voltage for the regulator within the range specified.
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* The driver should select the voltage closest to min_uV.
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* @set_voltage_sel: Set the voltage for the regulator using the specified
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* selector.
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* @get_voltage: Return the currently configured voltage for the regulator.
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* @get_voltage_sel: Return the currently configured voltage selector for the
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* regulator.
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* @list_voltage: Return one of the supported voltages, in microvolts; zero
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* if the selector indicates a voltage that is unusable on this system;
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* or negative errno. Selectors range from zero to one less than
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* regulator_desc.n_voltages. Voltages may be reported in any order.
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*
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* @set_current_limit: Configure a limit for a current-limited regulator.
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* @get_current_limit: Get the configured limit for a current-limited regulator.
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*
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* @set_mode: Set the configured operating mode for the regulator.
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* @get_mode: Get the configured operating mode for the regulator.
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* @get_status: Return actual (not as-configured) status of regulator, as a
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* REGULATOR_STATUS value (or negative errno)
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* @get_optimum_mode: Get the most efficient operating mode for the regulator
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* when running with the specified parameters.
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*
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* @enable_time: Time taken for the regulator voltage output voltage to
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* stabilise after being enabled, in microseconds.
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* @set_voltage_time_sel: Time taken for the regulator voltage output voltage
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* to stabilise after being set to a new value, in microseconds.
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* The function provides the from and to voltage selector, the
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* function should return the worst case.
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*
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* @set_suspend_voltage: Set the voltage for the regulator when the system
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* is suspended.
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* @set_suspend_enable: Mark the regulator as enabled when the system is
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* suspended.
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* @set_suspend_disable: Mark the regulator as disabled when the system is
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* suspended.
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* @set_suspend_mode: Set the operating mode for the regulator when the
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* system is suspended.
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*
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* This struct describes regulator operations which can be implemented by
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* regulator chip drivers.
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*/
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struct regulator_ops {
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/* enumerate supported voltages */
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int (*list_voltage) (struct regulator_dev *, unsigned selector);
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/* get/set regulator voltage */
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int (*set_voltage) (struct regulator_dev *, int min_uV, int max_uV,
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unsigned *selector);
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int (*set_voltage_sel) (struct regulator_dev *, unsigned selector);
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int (*get_voltage) (struct regulator_dev *);
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int (*get_voltage_sel) (struct regulator_dev *);
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/* get/set regulator current */
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int (*set_current_limit) (struct regulator_dev *,
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int min_uA, int max_uA);
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int (*get_current_limit) (struct regulator_dev *);
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/* enable/disable regulator */
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int (*enable) (struct regulator_dev *);
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int (*disable) (struct regulator_dev *);
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int (*is_enabled) (struct regulator_dev *);
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/* get/set regulator operating mode (defined in consumer.h) */
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int (*set_mode) (struct regulator_dev *, unsigned int mode);
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unsigned int (*get_mode) (struct regulator_dev *);
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/* Time taken to enable or set voltage on the regulator */
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int (*enable_time) (struct regulator_dev *);
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int (*set_voltage_time_sel) (struct regulator_dev *,
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unsigned int old_selector,
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unsigned int new_selector);
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/* report regulator status ... most other accessors report
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* control inputs, this reports results of combining inputs
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* from Linux (and other sources) with the actual load.
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* returns REGULATOR_STATUS_* or negative errno.
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*/
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int (*get_status)(struct regulator_dev *);
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/* get most efficient regulator operating mode for load */
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unsigned int (*get_optimum_mode) (struct regulator_dev *, int input_uV,
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int output_uV, int load_uA);
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/* the operations below are for configuration of regulator state when
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* its parent PMIC enters a global STANDBY/HIBERNATE state */
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/* set regulator suspend voltage */
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int (*set_suspend_voltage) (struct regulator_dev *, int uV);
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/* enable/disable regulator in suspend state */
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int (*set_suspend_enable) (struct regulator_dev *);
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int (*set_suspend_disable) (struct regulator_dev *);
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/* set regulator suspend operating mode (defined in consumer.h) */
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int (*set_suspend_mode) (struct regulator_dev *, unsigned int mode);
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};
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/*
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* Regulators can either control voltage or current.
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*/
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enum regulator_type {
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REGULATOR_VOLTAGE,
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REGULATOR_CURRENT,
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};
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/**
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* struct regulator_desc - Regulator descriptor
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*
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* Each regulator registered with the core is described with a structure of
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* this type.
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*
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* @name: Identifying name for the regulator.
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* @supply_name: Identifying the regulator supply
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* @id: Numerical identifier for the regulator.
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* @n_voltages: Number of selectors available for ops.list_voltage().
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* @ops: Regulator operations table.
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* @irq: Interrupt number for the regulator.
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* @type: Indicates if the regulator is a voltage or current regulator.
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* @owner: Module providing the regulator, used for refcounting.
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*/
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struct regulator_desc {
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const char *name;
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const char *supply_name;
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int id;
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unsigned n_voltages;
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struct regulator_ops *ops;
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int irq;
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enum regulator_type type;
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struct module *owner;
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};
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/*
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* struct regulator_dev
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*
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* Voltage / Current regulator class device. One for each
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* regulator.
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*
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* This should *not* be used directly by anything except the regulator
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* core and notification injection (which should take the mutex and do
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* no other direct access).
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*/
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struct regulator_dev {
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struct regulator_desc *desc;
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int exclusive;
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u32 use_count;
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u32 open_count;
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/* lists we belong to */
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struct list_head list; /* list of all regulators */
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/* lists we own */
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struct list_head consumer_list; /* consumers we supply */
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struct blocking_notifier_head notifier;
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struct mutex mutex; /* consumer lock */
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struct module *owner;
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struct device dev;
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struct regulation_constraints *constraints;
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struct regulator *supply; /* for tree */
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struct delayed_work disable_work;
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int deferred_disables;
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void *reg_data; /* regulator_dev data */
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struct dentry *debugfs;
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};
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struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
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struct device *dev, const struct regulator_init_data *init_data,
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void *driver_data, struct device_node *of_node);
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void regulator_unregister(struct regulator_dev *rdev);
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int regulator_notifier_call_chain(struct regulator_dev *rdev,
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unsigned long event, void *data);
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void *rdev_get_drvdata(struct regulator_dev *rdev);
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struct device *rdev_get_dev(struct regulator_dev *rdev);
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int rdev_get_id(struct regulator_dev *rdev);
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int regulator_mode_to_status(unsigned int);
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void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data);
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#endif
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