drivers/gpio/gpiolib-acpi.h

   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
  56 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
  57 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
  58
  59 static inline void
  60 acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
  61
  62 static inline void
  63 acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
  64
  65 static inline int
  66 acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
  67 {
  68         return 0;
  69 }
  70 static inline int
  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 *
  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 *
  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 }
  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 */