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
11 struct 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 * @wake_capable: wake capability as provided by ACPI
22 * @debounce: debounce timeout as provided by ACPI
23 * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
24 */
25 struct acpi_gpio_info {
26 struct acpi_device *adev;
27 enum gpiod_flags flags;
28 bool gpioint;
29 int pin_config;
30 int polarity;
31 int triggering;
32 bool wake_capable;
33 unsigned int debounce;
34 unsigned int quirks;
35 };
36
37 #ifdef CONFIG_ACPI
38 void acpi_gpiochip_add(struct gpio_chip *chip);
39 void acpi_gpiochip_remove(struct gpio_chip *chip);
40
41 void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev);
42
43 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
44 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);
45
46 int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags,
47 struct acpi_gpio_info *info);
48 int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
49 struct acpi_gpio_info *info);
50
51 struct gpio_desc *acpi_find_gpio(struct device *dev,
52 const char *con_id,
53 unsigned int idx,
54 enum gpiod_flags *dflags,
55 unsigned long *lookupflags);
56 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
57 const char *propname, int index,
58 struct acpi_gpio_info *info);
59
60 int acpi_gpio_count(struct device *dev, const char *con_id);
61 #else
acpi_gpiochip_add(struct gpio_chip * chip)62 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
acpi_gpiochip_remove(struct gpio_chip * chip)63 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
64
acpi_gpio_dev_init(struct gpio_chip * gc,struct gpio_device * gdev)65 static inline void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev) { }
66
67 static inline void
acpi_gpiochip_request_interrupts(struct gpio_chip * chip)68 acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
69
70 static inline void
acpi_gpiochip_free_interrupts(struct gpio_chip * chip)71 acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
72
73 static inline int
acpi_gpio_update_gpiod_flags(enum gpiod_flags * flags,struct acpi_gpio_info * info)74 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
75 {
76 return 0;
77 }
78 static inline int
acpi_gpio_update_gpiod_lookup_flags(unsigned long * lookupflags,struct acpi_gpio_info * info)79 acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
80 struct acpi_gpio_info *info)
81 {
82 return 0;
83 }
84
85 static inline struct gpio_desc *
acpi_find_gpio(struct device * dev,const char * con_id,unsigned int idx,enum gpiod_flags * dflags,unsigned long * lookupflags)86 acpi_find_gpio(struct device *dev, const char *con_id,
87 unsigned int idx, enum gpiod_flags *dflags,
88 unsigned long *lookupflags)
89 {
90 return ERR_PTR(-ENOENT);
91 }
92 static inline struct gpio_desc *
acpi_node_get_gpiod(struct fwnode_handle * fwnode,const char * propname,int index,struct acpi_gpio_info * info)93 acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname,
94 int index, struct acpi_gpio_info *info)
95 {
96 return ERR_PTR(-ENXIO);
97 }
acpi_gpio_count(struct device * dev,const char * con_id)98 static inline int acpi_gpio_count(struct device *dev, const char *con_id)
99 {
100 return -ENODEV;
101 }
102 #endif
103
104 #endif /* GPIOLIB_ACPI_H */
105
