412 lines
15 KiB
C
412 lines
15 KiB
C
/*
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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 regmap;
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struct regulator_dev;
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struct regulator_init_data;
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struct regulator_enable_gpio;
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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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/* The regulator is enabled but not regulating */
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REGULATOR_STATUS_BYPASS,
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/* in case that any other status doesn't apply */
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REGULATOR_STATUS_UNDEFINED,
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};
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/**
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* struct regulator_linear_range - specify linear voltage ranges
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*
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* Specify a range of voltages for regulator_map_linar_range() and
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* regulator_list_linear_range().
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*
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* @min_uV: Lowest voltage in range
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* @min_sel: Lowest selector for range
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* @max_sel: Highest selector for range
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* @uV_step: Step size
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*/
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struct regulator_linear_range {
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unsigned int min_uV;
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unsigned int min_sel;
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unsigned int max_sel;
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unsigned int uV_step;
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};
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/* Initialize struct regulator_linear_range */
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#define REGULATOR_LINEAR_RANGE(_min_uV, _min_sel, _max_sel, _step_uV) \
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{ \
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.min_uV = _min_uV, \
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.min_sel = _min_sel, \
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.max_sel = _max_sel, \
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.uV_step = _step_uV, \
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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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* @map_voltage: Convert a voltage into a 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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* The driver should select the current closest to max_uA.
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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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* @set_bypass: Set the regulator in bypass mode.
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* @get_bypass: Get the regulator bypass mode state.
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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_ramp_delay: Set the ramp delay for the regulator. The driver should
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* select ramp delay equal to or less than(closest) ramp_delay.
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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 (*map_voltage)(struct regulator_dev *, int min_uV, int max_uV);
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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_ramp_delay) (struct regulator_dev *, int ramp_delay);
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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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/* control and report on bypass mode */
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int (*set_bypass)(struct regulator_dev *dev, bool enable);
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int (*get_bypass)(struct regulator_dev *dev, bool *enable);
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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 - Static regulator descriptor
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*
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* Each regulator registered with the core is described with a
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* structure of this type and a struct regulator_config. This
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* structure contains the non-varying parts of the regulator
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* description.
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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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* @of_match: Name used to identify regulator in DT.
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* @regulators_node: Name of node containing regulator definitions in DT.
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* @id: Numerical identifier for the regulator.
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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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* @continuous_voltage_range: Indicates if the regulator can set any
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* voltage within constrains range.
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* @n_voltages: Number of selectors available for ops.list_voltage().
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*
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* @min_uV: Voltage given by the lowest selector (if linear mapping)
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* @uV_step: Voltage increase with each selector (if linear mapping)
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* @linear_min_sel: Minimal selector for starting linear mapping
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* @fixed_uV: Fixed voltage of rails.
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* @ramp_delay: Time to settle down after voltage change (unit: uV/us)
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* @linear_ranges: A constant table of possible voltage ranges.
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* @n_linear_ranges: Number of entries in the @linear_ranges table.
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* @volt_table: Voltage mapping table (if table based mapping)
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*
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* @vsel_reg: Register for selector when using regulator_regmap_X_voltage_
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* @vsel_mask: Mask for register bitfield used for selector
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* @apply_reg: Register for initiate voltage change on the output when
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* using regulator_set_voltage_sel_regmap
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* @apply_bit: Register bitfield used for initiate voltage change on the
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* output when using regulator_set_voltage_sel_regmap
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* @enable_reg: Register for control when using regmap enable/disable ops
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* @enable_mask: Mask for control when using regmap enable/disable ops
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* @enable_val: Enabling value for control when using regmap enable/disable ops
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* @disable_val: Disabling value for control when using regmap enable/disable ops
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* @enable_is_inverted: A flag to indicate set enable_mask bits to disable
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* when using regulator_enable_regmap and friends APIs.
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* @bypass_reg: Register for control when using regmap set_bypass
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* @bypass_mask: Mask for control when using regmap set_bypass
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* @bypass_val_on: Enabling value for control when using regmap set_bypass
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* @bypass_val_off: Disabling value for control when using regmap set_bypass
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*
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* @enable_time: Time taken for initial enable of regulator (in uS).
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* @off_on_delay: guard time (in uS), before re-enabling a regulator
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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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const char *of_match;
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const char *regulators_node;
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int id;
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bool continuous_voltage_range;
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unsigned n_voltages;
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const 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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unsigned int min_uV;
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unsigned int uV_step;
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unsigned int linear_min_sel;
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int fixed_uV;
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unsigned int ramp_delay;
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const struct regulator_linear_range *linear_ranges;
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int n_linear_ranges;
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const unsigned int *volt_table;
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unsigned int vsel_reg;
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unsigned int vsel_mask;
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unsigned int apply_reg;
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unsigned int apply_bit;
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unsigned int enable_reg;
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unsigned int enable_mask;
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unsigned int enable_val;
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unsigned int disable_val;
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bool enable_is_inverted;
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unsigned int bypass_reg;
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unsigned int bypass_mask;
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unsigned int bypass_val_on;
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unsigned int bypass_val_off;
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unsigned int enable_time;
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unsigned int off_on_delay;
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};
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/**
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* struct regulator_config - Dynamic regulator descriptor
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*
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* Each regulator registered with the core is described with a
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* structure of this type and a struct regulator_desc. This structure
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* contains the runtime variable parts of the regulator description.
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*
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* @dev: struct device for the regulator
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* @init_data: platform provided init data, passed through by driver
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* @driver_data: private regulator data
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* @of_node: OpenFirmware node to parse for device tree bindings (may be
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* NULL).
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* @regmap: regmap to use for core regmap helpers if dev_get_regulator() is
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* insufficient.
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* @ena_gpio: GPIO controlling regulator enable.
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* @ena_gpio_invert: Sense for GPIO enable control.
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* @ena_gpio_flags: Flags to use when calling gpio_request_one()
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*/
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struct regulator_config {
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struct device *dev;
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const struct regulator_init_data *init_data;
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void *driver_data;
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struct device_node *of_node;
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struct regmap *regmap;
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int ena_gpio;
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unsigned int ena_gpio_invert:1;
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unsigned int ena_gpio_flags;
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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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const 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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u32 bypass_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 regmap *regmap;
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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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struct regulator_enable_gpio *ena_pin;
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unsigned int ena_gpio_state:1;
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/* time when this regulator was disabled last time */
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unsigned long last_off_jiffy;
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};
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struct regulator_dev *
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regulator_register(const struct regulator_desc *regulator_desc,
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const struct regulator_config *config);
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struct regulator_dev *
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devm_regulator_register(struct device *dev,
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const struct regulator_desc *regulator_desc,
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const struct regulator_config *config);
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void regulator_unregister(struct regulator_dev *rdev);
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void devm_regulator_unregister(struct device *dev, 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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int regulator_list_voltage_linear(struct regulator_dev *rdev,
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unsigned int selector);
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int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
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unsigned int selector);
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int regulator_list_voltage_table(struct regulator_dev *rdev,
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unsigned int selector);
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int regulator_map_voltage_linear(struct regulator_dev *rdev,
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int min_uV, int max_uV);
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int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
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int min_uV, int max_uV);
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int regulator_map_voltage_iterate(struct regulator_dev *rdev,
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int min_uV, int max_uV);
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int regulator_map_voltage_ascend(struct regulator_dev *rdev,
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int min_uV, int max_uV);
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int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev);
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int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel);
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int regulator_is_enabled_regmap(struct regulator_dev *rdev);
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int regulator_enable_regmap(struct regulator_dev *rdev);
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int regulator_disable_regmap(struct regulator_dev *rdev);
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int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
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unsigned int old_selector,
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unsigned int new_selector);
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int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable);
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int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable);
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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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