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 * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
22 */
23 struct 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
34 void acpi_gpiochip_add(struct gpio_chip *chip);
35 void acpi_gpiochip_remove(struct gpio_chip *chip);
36
37 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
38 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);
39
40 int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags,
41 struct acpi_gpio_info *info);
42 int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
43 struct acpi_gpio_info *info);
44
45 struct 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);
50 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
51 const char *propname, int index,
52 struct acpi_gpio_info *info);
53
54 int acpi_gpio_count(struct device *dev, const char *con_id);
55 #else
acpi_gpiochip_add(struct gpio_chip * chip)56 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
acpi_gpiochip_remove(struct gpio_chip * chip)57 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
58
59 static inline void
acpi_gpiochip_request_interrupts(struct gpio_chip * chip)60 acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
61
62 static inline void
acpi_gpiochip_free_interrupts(struct gpio_chip * chip)63 acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
64
65 static inline int
acpi_gpio_update_gpiod_flags(enum gpiod_flags * flags,struct acpi_gpio_info * info)66 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
67 {
68 return 0;
69 }
70 static inline int
acpi_gpio_update_gpiod_lookup_flags(unsigned long * lookupflags,struct acpi_gpio_info * info)71 acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
72 struct acpi_gpio_info *info)
73 {
74 return 0;
75 }
76
77 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)78 acpi_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 }
84 static inline struct gpio_desc *
acpi_node_get_gpiod(struct fwnode_handle * fwnode,const char * propname,int index,struct acpi_gpio_info * info)85 acpi_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 }
acpi_gpio_count(struct device * dev,const char * con_id)90 static 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