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  * @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 */