| /* |
| * Internal GPIO functions. |
| * |
| * Copyright (C) 2013, Intel Corporation |
| * Author: Mika Westerberg <mika.westerberg@linux.intel.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #ifndef GPIOLIB_H |
| #define GPIOLIB_H |
| |
| #include <linux/err.h> |
| #include <linux/device.h> |
| #ifdef CONFIG_GPIO_NL_WAKEUP_SOURCE |
| #include <linux/pm_wakeup.h> |
| #endif |
| |
| enum of_gpio_flags; |
| |
| struct acpi_device; |
| |
| /** |
| * struct acpi_gpio_info - ACPI GPIO specific information |
| * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo |
| * @active_low: in case of @gpioint, the pin is active low |
| */ |
| struct acpi_gpio_info { |
| bool gpioint; |
| bool active_low; |
| }; |
| |
| /* gpio suffixes used for ACPI and device tree lookup */ |
| static const char * const gpio_suffixes[] = { "gpios", "gpio" }; |
| |
| #ifdef CONFIG_ACPI |
| void acpi_gpiochip_add(struct gpio_chip *chip); |
| void acpi_gpiochip_remove(struct gpio_chip *chip); |
| |
| void acpi_gpiochip_request_interrupts(struct gpio_chip *chip); |
| void acpi_gpiochip_free_interrupts(struct gpio_chip *chip); |
| |
| struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, |
| const char *propname, int index, |
| struct acpi_gpio_info *info); |
| |
| int acpi_gpio_count(struct device *dev, const char *con_id); |
| #else |
| static inline void acpi_gpiochip_add(struct gpio_chip *chip) { } |
| static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { } |
| |
| static inline void |
| acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { } |
| |
| static inline void |
| acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { } |
| |
| static inline struct gpio_desc * |
| acpi_get_gpiod_by_index(struct acpi_device *adev, const char *propname, |
| int index, struct acpi_gpio_info *info) |
| { |
| return ERR_PTR(-ENOSYS); |
| } |
| |
| static inline int acpi_gpio_count(struct device *dev, const char *con_id) |
| { |
| return -ENODEV; |
| } |
| #endif |
| |
| struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, |
| const char *list_name, int index, enum of_gpio_flags *flags); |
| |
| struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum); |
| |
| extern struct spinlock gpio_lock; |
| extern struct list_head gpio_chips; |
| |
| struct gpio_desc { |
| struct gpio_chip *chip; |
| unsigned long flags; |
| /* flag symbols are bit numbers */ |
| #define FLAG_REQUESTED 0 |
| #define FLAG_IS_OUT 1 |
| #define FLAG_EXPORT 2 /* protected by sysfs_lock */ |
| #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */ |
| #define FLAG_TRIG_FALL 4 /* trigger on falling edge */ |
| #define FLAG_TRIG_RISE 5 /* trigger on rising edge */ |
| #define FLAG_ACTIVE_LOW 6 /* value has active low */ |
| #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */ |
| #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */ |
| #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */ |
| #define FLAG_SYSFS_DIR 10 /* show sysfs direction attribute */ |
| #define FLAG_IS_HOGGED 11 /* GPIO is hogged */ |
| #ifdef CONFIG_GPIO_NL_WAKEUP_SOURCE |
| #define FLAG_WAKEUP_SOURCE 12 /* Gpio is a wakeup source */ |
| #endif |
| |
| #define ID_SHIFT 16 /* add new flags before this one */ |
| |
| #define GPIO_FLAGS_MASK ((1 << ID_SHIFT) - 1) |
| #define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE)) |
| |
| const char *label; |
| |
| #ifdef CONFIG_GPIO_NL_WAKEUP_SOURCE |
| struct wakeup_source *ws; |
| struct kernfs_node *valuesd; |
| #endif |
| }; |
| |
| int gpiod_request(struct gpio_desc *desc, const char *label); |
| void gpiod_free(struct gpio_desc *desc); |
| int gpiod_hog(struct gpio_desc *desc, const char *name, |
| unsigned long lflags, enum gpiod_flags dflags); |
| |
| /* |
| * Return the GPIO number of the passed descriptor relative to its chip |
| */ |
| static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc) |
| { |
| return desc - &desc->chip->desc[0]; |
| } |
| |
| /* With descriptor prefix */ |
| |
| #define gpiod_emerg(desc, fmt, ...) \ |
| pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ |
| ##__VA_ARGS__) |
| #define gpiod_crit(desc, fmt, ...) \ |
| pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ |
| ##__VA_ARGS__) |
| #define gpiod_err(desc, fmt, ...) \ |
| pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ |
| ##__VA_ARGS__) |
| #define gpiod_warn(desc, fmt, ...) \ |
| pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ |
| ##__VA_ARGS__) |
| #define gpiod_info(desc, fmt, ...) \ |
| pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ |
| ##__VA_ARGS__) |
| #define gpiod_dbg(desc, fmt, ...) \ |
| pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ |
| ##__VA_ARGS__) |
| |
| /* With chip prefix */ |
| |
| #define chip_emerg(chip, fmt, ...) \ |
| pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
| #define chip_crit(chip, fmt, ...) \ |
| pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
| #define chip_err(chip, fmt, ...) \ |
| pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
| #define chip_warn(chip, fmt, ...) \ |
| pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
| #define chip_info(chip, fmt, ...) \ |
| pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
| #define chip_dbg(chip, fmt, ...) \ |
| pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) |
| |
| #ifdef CONFIG_GPIO_SYSFS |
| |
| int gpiochip_export(struct gpio_chip *chip); |
| void gpiochip_unexport(struct gpio_chip *chip); |
| |
| #else |
| |
| static inline int gpiochip_export(struct gpio_chip *chip) |
| { |
| return 0; |
| } |
| |
| static inline void gpiochip_unexport(struct gpio_chip *chip) |
| { |
| } |
| |
| #endif /* CONFIG_GPIO_SYSFS */ |
| |
| #endif /* GPIOLIB_H */ |