gpiolib.h 7.09 KB
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/*
 * 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

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#include <linux/gpio/driver.h>
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#include <linux/err.h>
#include <linux/device.h>
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#include <linux/module.h>
#include <linux/cdev.h>
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enum of_gpio_flags;
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enum gpiod_flags;
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struct acpi_device;

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/**
 * struct gpio_device - internal state container for GPIO devices
 * @id: numerical ID number for the GPIO chip
 * @dev: the GPIO device struct
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 * @chrdev: character device for the GPIO device
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 * @mockdev: class device used by the deprecated sysfs interface (may be
 * NULL)
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 * @owner: helps prevent removal of modules exporting active GPIOs
 * @chip: pointer to the corresponding gpiochip, holding static
 * data for this device
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 * @descs: array of ngpio descriptors.
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 * @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.
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 * @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;
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	struct cdev		chrdev;
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	struct device		*mockdev;
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	struct module		*owner;
	struct gpio_chip	*chip;
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	struct gpio_desc	*descs;
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	int			base;
	u16			ngpio;
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	struct list_head        list;
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#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
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};

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/**
 * 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;
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	int polarity;
	int triggering;
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};

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/* gpio suffixes used for ACPI and device tree lookup */
static const char * const gpio_suffixes[] = { "gpios", "gpio" };

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#ifdef CONFIG_ACPI
void acpi_gpiochip_add(struct gpio_chip *chip);
void acpi_gpiochip_remove(struct gpio_chip *chip);
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void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);

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struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
					  const char *propname, int index,
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					  struct acpi_gpio_info *info);
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struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
				      const char *propname, int index,
				      struct acpi_gpio_info *info);
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int acpi_gpio_count(struct device *dev, const char *con_id);
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bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id);
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#else
static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
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) { }

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

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static inline struct gpio_desc *
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acpi_get_gpiod_by_index(struct acpi_device *adev, const char *propname,
			int index, struct acpi_gpio_info *info)
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{
	return ERR_PTR(-ENOSYS);
}
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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

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struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
		   const char *list_name, int index, enum of_gpio_flags *flags);

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struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);

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extern struct spinlock gpio_lock;
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extern struct list_head gpio_devices;
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struct gpio_desc {
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	struct gpio_device	*gdev;
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	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 */
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#define FLAG_IS_HOGGED	11	/* GPIO is hogged */
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	/* Connection label */
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	const char		*label;
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	/* Name of the GPIO */
	const char		*name;
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};

int gpiod_request(struct gpio_desc *desc, const char *label);
void gpiod_free(struct gpio_desc *desc);
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int gpiod_hog(struct gpio_desc *desc, const char *name,
		unsigned long lflags, enum gpiod_flags dflags);
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/*
 * Return the GPIO number of the passed descriptor relative to its chip
 */
static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc)
{
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	return desc - &desc->gdev->descs[0];
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}

/* 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, ...)					\
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	dev_emerg(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
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#define chip_crit(chip, fmt, ...)					\
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	dev_crit(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
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#define chip_err(chip, fmt, ...)					\
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	dev_err(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
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#define chip_warn(chip, fmt, ...)					\
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	dev_warn(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
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#define chip_info(chip, fmt, ...)					\
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	dev_info(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
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#define chip_dbg(chip, fmt, ...)					\
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	dev_dbg(&chip->gpiodev->dev, "(%s): " fmt, chip->label, ##__VA_ARGS__)
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#ifdef CONFIG_GPIO_SYSFS

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int gpiochip_sysfs_register(struct gpio_device *gdev);
void gpiochip_sysfs_unregister(struct gpio_device *gdev);
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#else

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static inline int gpiochip_sysfs_register(struct gpio_device *gdev)
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{
	return 0;
}

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

#endif /* CONFIG_GPIO_SYSFS */

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#endif /* GPIOLIB_H */