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_gpiochip_request_interrupts(struct gpio_chip *chip); 40 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip); 41 42 int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, 43 struct acpi_gpio_info *info); 44 int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, 45 struct acpi_gpio_info *info); 46 47 struct gpio_desc *acpi_find_gpio(struct device *dev, 48 const char *con_id, 49 unsigned int idx, 50 enum gpiod_flags *dflags, 51 unsigned long *lookupflags); 52 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, 53 const char *propname, int index, 54 struct acpi_gpio_info *info); 55 56 int acpi_gpio_count(struct device *dev, const char *con_id); 57 #else 58 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { } 59 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { } 60 61 static inline void 62 acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { } 63 64 static inline void 65 acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { } 66 67 static inline int 68 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info) 69 { 70 return 0; 71 } 72 static inline int 73 acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, 74 struct acpi_gpio_info *info) 75 { 76 return 0; 77 } 78 79 static inline struct gpio_desc * 80 acpi_find_gpio(struct device *dev, const char *con_id, 81 unsigned int idx, enum gpiod_flags *dflags, 82 unsigned long *lookupflags) 83 { 84 return ERR_PTR(-ENOENT); 85 } 86 static inline struct gpio_desc * 87 acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, 88 int index, struct acpi_gpio_info *info) 89 { 90 return ERR_PTR(-ENXIO); 91 } 92 static inline int acpi_gpio_count(struct device *dev, const char *con_id) 93 { 94 return -ENODEV; 95 } 96 #endif 97 98 #endif /* GPIOLIB_ACPI_H */ 99