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/* SPDX-License-Identifier: GPL-2.0 */
/*
* coupler.h -- SoC Regulator support, coupler API.
*
* Regulator Coupler Interface.
*/
#ifndef __LINUX_REGULATOR_COUPLER_H_
#define __LINUX_REGULATOR_COUPLER_H_
#include <linux/kernel.h>
#include <linux/suspend.h>
struct regulator_coupler;
struct regulator_dev;
/**
* struct regulator_coupler - customized regulator's coupler
*
* Regulator's coupler allows to customize coupling algorithm.
*
* @list: couplers list entry
* @attach_regulator: Callback invoked on creation of a coupled regulator,
* couples are unresolved at this point. The callee should
* check that it could handle the regulator and return 0 on
* success, -errno on failure and 1 if given regulator is
* not suitable for this coupler (case of having multiple
* regulators in a system). Callback shall be implemented.
* @detach_regulator: Callback invoked on destruction of a coupled regulator.
* This callback is optional and could be NULL.
* @balance_voltage: Callback invoked when voltage of a coupled regulator is
* changing. Called with all of the coupled rdev's being held
* under "consumer lock". The callee should perform voltage
* balancing, changing voltage of the coupled regulators as
* needed. It's up to the coupler to verify the voltage
* before changing it in hardware, i.e. coupler should
* check consumer's min/max and etc. This callback is
* optional and could be NULL, in which case a generic
* voltage balancer will be used.
*/
struct regulator_coupler {
struct list_head list;
int (*attach_regulator)(struct regulator_coupler *coupler,
struct regulator_dev *rdev);
int (*detach_regulator)(struct regulator_coupler *coupler,
struct regulator_dev *rdev);
int (*balance_voltage)(struct regulator_coupler *coupler,
struct regulator_dev *rdev,
suspend_state_t state);
};
#ifdef CONFIG_REGULATOR
int regulator_coupler_register(struct regulator_coupler *coupler);
int regulator_check_consumers(struct regulator_dev *rdev,
int *min_uV, int *max_uV,
suspend_state_t state);
int regulator_check_voltage(struct regulator_dev *rdev,
int *min_uV, int *max_uV);
int regulator_get_voltage_rdev(struct regulator_dev *rdev);
int regulator_set_voltage_rdev(struct regulator_dev *rdev,
int min_uV, int max_uV,
suspend_state_t state);
int regulator_do_balance_voltage(struct regulator_dev *rdev,
suspend_state_t state, bool skip_coupled);
#else
static inline int regulator_coupler_register(struct regulator_coupler *coupler)
{
return 0;
}
static inline int regulator_check_consumers(struct regulator_dev *rdev,
int *min_uV, int *max_uV,
suspend_state_t state)
{
return -EINVAL;
}
static inline int regulator_check_voltage(struct regulator_dev *rdev,
int *min_uV, int *max_uV)
{
return -EINVAL;
}
static inline int regulator_get_voltage_rdev(struct regulator_dev *rdev)
{
return -EINVAL;
}
static inline int regulator_set_voltage_rdev(struct regulator_dev *rdev,
int min_uV, int max_uV,
suspend_state_t state)
{
return -EINVAL;
}
static inline int regulator_do_balance_voltage(struct regulator_dev *rdev,
suspend_state_t state,
bool skip_coupled)
{
return -EINVAL;
}
#endif
#endif
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