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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* machine.h -- SoC Regulator support, machine/board driver API.
*
* Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
*
* Author: Liam Girdwood <lrg@slimlogic.co.uk>
*
* Regulator Machine/Board Interface.
*/
#ifndef __LINUX_REGULATOR_MACHINE_H_
#define __LINUX_REGULATOR_MACHINE_H_
#include <linux/regulator/consumer.h>
#include <linux/suspend.h>
struct regulator;
/*
* Regulator operation constraint flags. These flags are used to enable
* certain regulator operations and can be OR'ed together.
*
* VOLTAGE: Regulator output voltage can be changed by software on this
* board/machine.
* CURRENT: Regulator output current can be changed by software on this
* board/machine.
* MODE: Regulator operating mode can be changed by software on this
* board/machine.
* STATUS: Regulator can be enabled and disabled.
* DRMS: Dynamic Regulator Mode Switching is enabled for this regulator.
* BYPASS: Regulator can be put into bypass mode
*/
#define REGULATOR_CHANGE_VOLTAGE 0x1
#define REGULATOR_CHANGE_CURRENT 0x2
#define REGULATOR_CHANGE_MODE 0x4
#define REGULATOR_CHANGE_STATUS 0x8
#define REGULATOR_CHANGE_DRMS 0x10
#define REGULATOR_CHANGE_BYPASS 0x20
/*
* operations in suspend mode
* DO_NOTHING_IN_SUSPEND - the default value
* DISABLE_IN_SUSPEND - turn off regulator in suspend states
* ENABLE_IN_SUSPEND - keep regulator on in suspend states
*/
#define DO_NOTHING_IN_SUSPEND 0
#define DISABLE_IN_SUSPEND 1
#define ENABLE_IN_SUSPEND 2
/* Regulator active discharge flags */
enum regulator_active_discharge {
REGULATOR_ACTIVE_DISCHARGE_DEFAULT,
REGULATOR_ACTIVE_DISCHARGE_DISABLE,
REGULATOR_ACTIVE_DISCHARGE_ENABLE,
};
/**
* struct regulator_state - regulator state during low power system states
*
* This describes a regulators state during a system wide low power
* state. One of enabled or disabled must be set for the
* configuration to be applied.
*
* @uV: Default operating voltage during suspend, it can be adjusted
* among <min_uV, max_uV>.
* @min_uV: Minimum suspend voltage may be set.
* @max_uV: Maximum suspend voltage may be set.
* @mode: Operating mode during suspend.
* @enabled: operations during suspend.
* - DO_NOTHING_IN_SUSPEND
* - DISABLE_IN_SUSPEND
* - ENABLE_IN_SUSPEND
* @changeable: Is this state can be switched between enabled/disabled,
*/
struct regulator_state {
int uV;
int min_uV;
int max_uV;
unsigned int mode;
int enabled;
bool changeable;
};
#define REGULATOR_NOTIF_LIMIT_DISABLE -1
#define REGULATOR_NOTIF_LIMIT_ENABLE -2
struct notification_limit {
int prot;
int err;
int warn;
};
/**
* struct regulation_constraints - regulator operating constraints.
*
* This struct describes regulator and board/machine specific constraints.
*
* @name: Descriptive name for the constraints, used for display purposes.
*
* @min_uV: Smallest voltage consumers may set.
* @max_uV: Largest voltage consumers may set.
* @uV_offset: Offset applied to voltages from consumer to compensate for
* voltage drops.
*
* @min_uA: Smallest current consumers may set.
* @max_uA: Largest current consumers may set.
* @ilim_uA: Maximum input current.
* @system_load: Load that isn't captured by any consumer requests.
*
* @over_curr_limits: Limits for acting on over current.
* @over_voltage_limits: Limits for acting on over voltage.
* @under_voltage_limits: Limits for acting on under voltage.
* @temp_limits: Limits for acting on over temperature.
* @max_spread: Max possible spread between coupled regulators
* @max_uV_step: Max possible step change in voltage
* @valid_modes_mask: Mask of modes which may be configured by consumers.
* @valid_ops_mask: Operations which may be performed by consumers.
*
* @always_on: Set if the regulator should never be disabled.
* @boot_on: Set if the regulator is enabled when the system is initially
* started. If the regulator is not enabled by the hardware or
* bootloader then it will be enabled when the constraints are
* applied.
* @apply_uV: Apply the voltage constraint when initialising.
* @ramp_disable: Disable ramp delay when initialising or when setting voltage.
* @soft_start: Enable soft start so that voltage ramps slowly.
* @pull_down: Enable pull down when regulator is disabled.
* @over_current_protection: Auto disable on over current event.
*
* @over_current_detection: Configure over current limits.
* @over_voltage_detection: Configure over voltage limits.
* @under_voltage_detection: Configure under voltage limits.
* @over_temp_detection: Configure over temperature limits.
*
* @input_uV: Input voltage for regulator when supplied by another regulator.
*
* @state_disk: State for regulator when system is suspended in disk mode.
* @state_mem: State for regulator when system is suspended in mem mode.
* @state_standby: State for regulator when system is suspended in standby
* mode.
* @initial_state: Suspend state to set by default.
* @initial_mode: Mode to set at startup.
* @ramp_delay: Time to settle down after voltage change (unit: uV/us)
* @settling_time: Time to settle down after voltage change when voltage
* change is non-linear (unit: microseconds).
* @settling_time_up: Time to settle down after voltage increase when voltage
* change is non-linear (unit: microseconds).
* @settling_time_down : Time to settle down after voltage decrease when
* voltage change is non-linear (unit: microseconds).
* @active_discharge: Enable/disable active discharge. The enum
* regulator_active_discharge values are used for
* initialisation.
* @enable_time: Turn-on time of the rails (unit: microseconds)
*/
struct regulation_constraints {
const char *name;
/* voltage output range (inclusive) - for voltage control */
int min_uV;
int max_uV;
int uV_offset;
/* current output range (inclusive) - for current control */
int min_uA;
int max_uA;
int ilim_uA;
int system_load;
/* used for coupled regulators */
u32 *max_spread;
/* used for changing voltage in steps */
int max_uV_step;
/* valid regulator operating modes for this machine */
unsigned int valid_modes_mask;
/* valid operations for regulator on this machine */
unsigned int valid_ops_mask;
/* regulator input voltage - only if supply is another regulator */
int input_uV;
/* regulator suspend states for global PMIC STANDBY/HIBERNATE */
struct regulator_state state_disk;
struct regulator_state state_mem;
struct regulator_state state_standby;
struct notification_limit over_curr_limits;
struct notification_limit over_voltage_limits;
struct notification_limit under_voltage_limits;
struct notification_limit temp_limits;
suspend_state_t initial_state; /* suspend state to set at init */
/* mode to set on startup */
unsigned int initial_mode;
unsigned int ramp_delay;
unsigned int settling_time;
unsigned int settling_time_up;
unsigned int settling_time_down;
unsigned int enable_time;
unsigned int active_discharge;
/* constraint flags */
unsigned always_on:1; /* regulator never off when system is on */
unsigned boot_on:1; /* bootloader/firmware enabled regulator */
unsigned apply_uV:1; /* apply uV constraint if min == max */
unsigned ramp_disable:1; /* disable ramp delay */
unsigned soft_start:1; /* ramp voltage slowly */
unsigned pull_down:1; /* pull down resistor when regulator off */
unsigned over_current_protection:1; /* auto disable on over current */
unsigned over_current_detection:1; /* notify on over current */
unsigned over_voltage_detection:1; /* notify on over voltage */
unsigned under_voltage_detection:1; /* notify on under voltage */
unsigned over_temp_detection:1; /* notify on over temperature */
};
/**
* struct regulator_consumer_supply - supply -> device mapping
*
* This maps a supply name to a device. Use of dev_name allows support for
* buses which make struct device available late such as I2C.
*
* @dev_name: Result of dev_name() for the consumer.
* @supply: Name for the supply.
*/
struct regulator_consumer_supply {
const char *dev_name; /* dev_name() for consumer */
const char *supply; /* consumer supply - e.g. "vcc" */
};
/* Initialize struct regulator_consumer_supply */
#define REGULATOR_SUPPLY(_name, _dev_name) \
{ \
.supply = _name, \
.dev_name = _dev_name, \
}
/**
* struct regulator_init_data - regulator platform initialisation data.
*
* Initialisation constraints, our supply and consumers supplies.
*
* @supply_regulator: Parent regulator. Specified using the regulator name
* as it appears in the name field in sysfs, which can
* be explicitly set using the constraints field 'name'.
*
* @constraints: Constraints. These must be specified for the regulator to
* be usable.
* @num_consumer_supplies: Number of consumer device supplies.
* @consumer_supplies: Consumer device supply configuration.
*
* @regulator_init: Callback invoked when the regulator has been registered.
* @driver_data: Data passed to regulator_init.
*/
struct regulator_init_data {
const char *supply_regulator; /* or NULL for system supply */
struct regulation_constraints constraints;
int num_consumer_supplies;
struct regulator_consumer_supply *consumer_supplies;
/* optional regulator machine specific init */
int (*regulator_init)(void *driver_data);
void *driver_data; /* core does not touch this */
};
#ifdef CONFIG_REGULATOR
void regulator_has_full_constraints(void);
#else
static inline void regulator_has_full_constraints(void)
{
}
#endif
static inline int regulator_suspend_prepare(suspend_state_t state)
{
return 0;
}
static inline int regulator_suspend_finish(void)
{
return 0;
}
#endif
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