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