![Andy Shevchenko](/assets/img/avatar_default.png)
This allows ACPI GPIO code to modify flags based on ACPI GpioIo() / GpioInt() resources. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
284 lines
8.9 KiB
C
284 lines
8.9 KiB
C
/*
|
|
* 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);
|
|
}
|
|
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);
|
|
}
|
|
static inline int of_gpiochip_add(struct gpio_chip *gc) { return 0; }
|
|
static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
|
|
#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) { }
|
|
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 int
|
|
acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
}
|
|
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 *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 int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc)
|
|
{
|
|
return desc - &desc->gdev->descs[0];
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static inline void gpiochip_sysfs_unregister(struct gpio_device *gdev)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_GPIO_SYSFS */
|
|
|
|
#endif /* GPIOLIB_H */
|