1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * ACPI helpers for GPIO API
4 *
5 * Copyright (C) 2012,2019 Intel Corporation
6 */
7
8#ifndef GPIOLIB_ACPI_H
9#define GPIOLIB_ACPI_H
10
11struct acpi_device;
12
13/**
14 * struct acpi_gpio_info - ACPI GPIO specific information
15 * @adev: reference to ACPI device which consumes GPIO resource
16 * @flags: GPIO initialization flags
17 * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
18 * @pin_config: pin bias as provided by ACPI
19 * @polarity: interrupt polarity as provided by ACPI
20 * @triggering: triggering type as provided by ACPI
21 * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
22 */
23struct acpi_gpio_info {
24	struct acpi_device *adev;
25	enum gpiod_flags flags;
26	bool gpioint;
27	int pin_config;
28	int polarity;
29	int triggering;
30	unsigned int quirks;
31};
32
33#ifdef CONFIG_ACPI
34void acpi_gpiochip_add(struct gpio_chip *chip);
35void acpi_gpiochip_remove(struct gpio_chip *chip);
36
37void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
38void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);
39
40int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags,
41				 struct acpi_gpio_info *info);
42int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
43					struct acpi_gpio_info *info);
44
45struct gpio_desc *acpi_find_gpio(struct device *dev,
46				 const char *con_id,
47				 unsigned int idx,
48				 enum gpiod_flags *dflags,
49				 unsigned long *lookupflags);
50struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
51				      const char *propname, int index,
52				      struct acpi_gpio_info *info);
53
54int acpi_gpio_count(struct device *dev, const char *con_id);
55#else
56static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
57static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
58
59static inline void
60acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
61
62static inline void
63acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
64
65static inline int
66acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
67{
68	return 0;
69}
70static inline int
71acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
72				    struct acpi_gpio_info *info)
73{
74	return 0;
75}
76
77static inline struct gpio_desc *
78acpi_find_gpio(struct device *dev, const char *con_id,
79	       unsigned int idx, enum gpiod_flags *dflags,
80	       unsigned long *lookupflags)
81{
82	return ERR_PTR(-ENOENT);
83}
84static inline struct gpio_desc *
85acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname,
86		    int index, struct acpi_gpio_info *info)
87{
88	return ERR_PTR(-ENXIO);
89}
90static inline int acpi_gpio_count(struct device *dev, const char *con_id)
91{
92	return -ENODEV;
93}
94#endif
95
96#endif /* GPIOLIB_ACPI_H */
97