/* * Internal GPIO functions. * * Copyright (C) 2013, Intel Corporation * Author: Mika Westerberg * * 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 #include #include #include #include enum of_gpio_flags; enum gpiod_flags; struct acpi_device; /** * struct gpio_device - internal state container for GPIO devices * @id: numerical ID number for the GPIO chip * @dev: the GPIO device struct * @owner: helps prevent removal of modules exporting active GPIOs * @chip: pointer to the corresponding gpiochip, holding static * data for this device * @list: links gpio_device:s together for traversal * * This state container holds most of the runtime variable data * for a GPIO device and can hold references and live on after the * GPIO chip has been removed, if it is still being used from * userspace. */ struct gpio_device { int id; struct device dev; struct module *owner; struct gpio_chip *chip; struct list_head list; }; /** * 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; int polarity; int triggering; }; /* 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); struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, int index, struct acpi_gpio_info *info); int acpi_gpio_count(struct device *dev, const char *con_id); bool acpi_can_fallback_to_crs(struct acpi_device *adev, 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 struct gpio_desc * acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, int index, struct acpi_gpio_info *info) { return ERR_PTR(-ENXIO); } static inline int acpi_gpio_count(struct device *dev, const char *con_id) { return -ENODEV; } static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id) { return false; } #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_devices; 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_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_IS_HOGGED 11 /* GPIO is hogged */ /* Connection label */ const char *label; /* Name of the GPIO */ const char *name; }; 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_sysfs_register(struct gpio_chip *chip); void gpiochip_sysfs_unregister(struct gpio_chip *chip); #else static inline int gpiochip_sysfs_register(struct gpio_chip *chip) { return 0; } static inline void gpiochip_sysfs_unregister(struct gpio_chip *chip) { } #endif /* CONFIG_GPIO_SYSFS */ #endif /* GPIOLIB_H */