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 60 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { } 61 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { } 62 63 static inline void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev) { } 64 65 static inline void 66 acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { } 67 68 static inline void 69 acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { } 70 71 static inline int 72 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info) 73 { 74 return 0; 75 } 76 static inline int 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 * 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 * 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 } 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