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Release 4.14 drivers/gpio/gpiolib.h

Directory: drivers/gpio
/*
 * 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/gpio/driver.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/cdev.h>

enum of_gpio_flags;
enum gpiod_flags;
enum gpio_lookup_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
 * @chrdev: character device for the GPIO device
 * @mockdev: class device used by the deprecated sysfs interface (may be
 * NULL)
 * @owner: helps prevent removal of modules exporting active GPIOs
 * @chip: pointer to the corresponding gpiochip, holding static
 * data for this device
 * @descs: array of ngpio descriptors.
 * @ngpio: the number of GPIO lines on this GPIO device, equal to the size
 * of the @descs array.
 * @base: GPIO base in the DEPRECATED global Linux GPIO numberspace, assigned
 * at device creation time.
 * @label: a descriptive name for the GPIO device, such as the part number
 * or name of the IP component in a System on Chip.
 * @data: per-instance data assigned by the driver
 * @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 cdev		chrdev;
	
struct device		*mockdev;
	
struct module		*owner;
	
struct gpio_chip	*chip;
	
struct gpio_desc	*descs;
	
int			base;
	
u16			ngpio;
	
char			*label;
	
void			*data;
	
struct list_head        list;

#ifdef CONFIG_PINCTRL
	/*
         * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally
         * describe the actual pin range which they serve in an SoC. This
         * information would be used by pinctrl subsystem to configure
         * corresponding pins for gpio usage.
         */
	
struct list_head pin_ranges;
#endif
};

/**
 * struct acpi_gpio_info - ACPI GPIO specific information
 * @flags: GPIO initialization flags
 * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
 * @polarity: interrupt polarity as provided by ACPI
 * @triggering: triggering type as provided by ACPI
 */

struct acpi_gpio_info {
	
enum gpiod_flags flags;
	
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_OF_GPIO
struct gpio_desc *of_find_gpio(struct device *dev,
			       const char *con_id,
			       unsigned int idx,
			       enum gpio_lookup_flags *flags);
struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
		   const char *list_name, int index, enum of_gpio_flags *flags);
int of_gpiochip_add(struct gpio_chip *gc);
void of_gpiochip_remove(struct gpio_chip *gc);
#else

static inline struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, unsigned int idx, enum gpio_lookup_flags *flags) { return ERR_PTR(-ENOENT); }

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static inline struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, const char *list_name, int index, enum of_gpio_flags *flags) { return ERR_PTR(-ENOENT); }

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static inline int of_gpiochip_add(struct gpio_chip *gc) { return 0; }

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static inline void of_gpiochip_remove(struct gpio_chip *gc) { }

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#endif /* CONFIG_OF_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); int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update); struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id, unsigned int idx, enum gpiod_flags *dflags, enum gpio_lookup_flags *lookupflags); 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) { }

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static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }

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static inline void acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }

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static inline void acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }

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static inline int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update) { return 0; }

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static inline struct gpio_desc * acpi_find_gpio(struct device *dev, const char *con_id, unsigned int idx, enum gpiod_flags *dflags, enum gpio_lookup_flags *lookupflags) { return ERR_PTR(-ENOENT); }

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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); }

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static inline int acpi_gpio_count(struct device *dev, const char *con_id) { return -ENODEV; }

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static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id) { return false; }

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#endif struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum); void gpiod_set_array_value_complex(bool raw, bool can_sleep, unsigned int array_size, struct gpio_desc **desc_array, int *value_array); extern struct spinlock gpio_lock; extern struct list_head gpio_devices; struct gpio_desc { struct gpio_device *gdev; 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 */ #define FLAG_SLEEP_MAY_LOOSE_VALUE 12 /* GPIO may loose value in sleep */ /* 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_configure_flags(struct gpio_desc *desc, const char *con_id, unsigned long lflags, enum gpiod_flags dflags); 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 inline int gpio_chip_hwgpio(const struct gpio_desc *desc) { return desc - &desc->gdev->descs[0]; }

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void devprop_gpiochip_set_names(struct gpio_chip *chip); /* 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, ...) \ dev_emerg(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #define chip_crit(chip, fmt, ...) \ dev_crit(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #define chip_err(chip, fmt, ...) \ dev_err(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #define chip_warn(chip, fmt, ...) \ dev_warn(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #define chip_info(chip, fmt, ...) \ dev_info(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #define chip_dbg(chip, fmt, ...) \ dev_dbg(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__) #ifdef CONFIG_GPIO_SYSFS int gpiochip_sysfs_register(struct gpio_device *gdev); void gpiochip_sysfs_unregister(struct gpio_device *gdev); #else
static inline int gpiochip_sysfs_register(struct gpio_device *gdev) { return 0; }

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static inline void gpiochip_sysfs_unregister(struct gpio_device *gdev) { }

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#endif /* CONFIG_GPIO_SYSFS */ #endif /* GPIOLIB_H */

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Directory: drivers/gpio
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