drivers/gpio/gpiolib.h

   1 /*
   2  * Internal GPIO functions.
   3  *
   4  * Copyright (C) 2013, Intel Corporation
   5  * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #ifndef GPIOLIB_H
  13 #define GPIOLIB_H
  14
  15 #include <linux/err.h>
  16 #include <linux/device.h>
  17
  18 /**
  19  * struct acpi_gpio_info - ACPI GPIO specific information
  20  * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
  21  * @active_low: in case of @gpioint, the pin is active low
  22  */
  23 struct acpi_gpio_info {
  24         bool gpioint;
  25         bool active_low;
  26 };
  27
  28 #ifdef CONFIG_ACPI
  29 void acpi_gpiochip_add(struct gpio_chip *chip);
  30 void acpi_gpiochip_remove(struct gpio_chip *chip);
  31
  32 struct gpio_desc *acpi_get_gpiod_by_index(struct device *dev, int index,
  33                                           struct acpi_gpio_info *info);
  34 #else
  35 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
  36 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
  37
  38 static inline struct gpio_desc *
  39 acpi_get_gpiod_by_index(struct device *dev, int index,
  40                         struct acpi_gpio_info *info)
  41 {
  42         return ERR_PTR(-ENOSYS);
  43 }
  44 #endif
  45
  46 int gpiochip_request_own_desc(struct gpio_desc *desc, const char *label);
  47 void gpiochip_free_own_desc(struct gpio_desc *desc);
  48
  49 #endif /* GPIOLIB_H */