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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * coupler.h -- SoC Regulator support, coupler API.
4 *
5 * Regulator Coupler Interface.
6 */
7
8#ifndef __LINUX_REGULATOR_COUPLER_H_
9#define __LINUX_REGULATOR_COUPLER_H_
10
11#include <linux/errno.h>
12#include <linux/types.h>
13#include <linux/suspend.h>
14
15struct regulator_coupler;
16struct regulator_dev;
17
18/**
19 * struct regulator_coupler - customized regulator's coupler
20 *
21 * Regulator's coupler allows to customize coupling algorithm.
22 *
23 * @list: couplers list entry
24 * @attach_regulator: Callback invoked on creation of a coupled regulator,
25 * couples are unresolved at this point. The callee should
26 * check that it could handle the regulator and return 0 on
27 * success, -errno on failure and 1 if given regulator is
28 * not suitable for this coupler (case of having multiple
29 * regulators in a system). Callback shall be implemented.
30 * @detach_regulator: Callback invoked on destruction of a coupled regulator.
31 * This callback is optional and could be NULL.
32 * @balance_voltage: Callback invoked when voltage of a coupled regulator is
33 * changing. Called with all of the coupled rdev's being held
34 * under "consumer lock". The callee should perform voltage
35 * balancing, changing voltage of the coupled regulators as
36 * needed. It's up to the coupler to verify the voltage
37 * before changing it in hardware, i.e. coupler should
38 * check consumer's min/max and etc. This callback is
39 * optional and could be NULL, in which case a generic
40 * voltage balancer will be used.
41 */
42struct regulator_coupler {
43 struct list_head list;
44
45 int (*attach_regulator)(struct regulator_coupler *coupler,
46 struct regulator_dev *rdev);
47 int (*detach_regulator)(struct regulator_coupler *coupler,
48 struct regulator_dev *rdev);
49 int (*balance_voltage)(struct regulator_coupler *coupler,
50 struct regulator_dev *rdev,
51 suspend_state_t state);
52};
53
54#ifdef CONFIG_REGULATOR
55int regulator_coupler_register(struct regulator_coupler *coupler);
56int regulator_check_consumers(struct regulator_dev *rdev,
57 int *min_uV, int *max_uV,
58 suspend_state_t state);
59int regulator_check_voltage(struct regulator_dev *rdev,
60 int *min_uV, int *max_uV);
61int regulator_get_voltage_rdev(struct regulator_dev *rdev);
62int regulator_set_voltage_rdev(struct regulator_dev *rdev,
63 int min_uV, int max_uV,
64 suspend_state_t state);
65int regulator_do_balance_voltage(struct regulator_dev *rdev,
66 suspend_state_t state, bool skip_coupled);
67#else
68static inline int regulator_coupler_register(struct regulator_coupler *coupler)
69{
70 return 0;
71}
72static inline int regulator_check_consumers(struct regulator_dev *rdev,
73 int *min_uV, int *max_uV,
74 suspend_state_t state)
75{
76 return -EINVAL;
77}
78static inline int regulator_check_voltage(struct regulator_dev *rdev,
79 int *min_uV, int *max_uV)
80{
81 return -EINVAL;
82}
83static inline int regulator_get_voltage_rdev(struct regulator_dev *rdev)
84{
85 return -EINVAL;
86}
87static inline int regulator_set_voltage_rdev(struct regulator_dev *rdev,
88 int min_uV, int max_uV,
89 suspend_state_t state)
90{
91 return -EINVAL;
92}
93static inline int regulator_do_balance_voltage(struct regulator_dev *rdev,
94 suspend_state_t state,
95 bool skip_coupled)
96{
97 return -EINVAL;
98}
99#endif
100
101#endif