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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); const char *rdev_get_name(struct regulator_dev *rdev); 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); #else static inline int regulator_coupler_register(struct regulator_coupler *coupler) { return 0; } static inline const char *rdev_get_name(struct regulator_dev *rdev) { return NULL; } 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; } #endif #endif
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