266 lines
8.8 KiB
C
266 lines
8.8 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/*
|
||
|
|
* Internal GPIO functions.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2013, Intel Corporation
|
||
|
|
* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef GPIOLIB_H
|
||
|
|
#define GPIOLIB_H
|
||
|
|
|
||
|
|
#include <linux/gpio/driver.h>
|
||
|
|
#include <linux/gpio/consumer.h> /* for enum gpiod_flags */
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <linux/device.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/cdev.h>
|
||
|
|
#include <linux/rwsem.h>
|
||
|
|
|
||
|
|
#define GPIOCHIP_NAME "gpiochip"
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct gpio_device - internal state container for GPIO devices
|
||
|
|
* @dev: the GPIO device struct
|
||
|
|
* @chrdev: character device for the GPIO device
|
||
|
|
* @id: numerical ID number for the GPIO chip
|
||
|
|
* @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
|
||
|
|
* @notifier: used to notify subscribers about lines being requested, released
|
||
|
|
* or reconfigured
|
||
|
|
* @sem: protects the structure from a NULL-pointer dereference of @chip by
|
||
|
|
* user-space operations when the device gets unregistered during
|
||
|
|
* a hot-unplug event
|
||
|
|
* @pin_ranges: range of pins served by the GPIO driver
|
||
|
|
*
|
||
|
|
* 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 {
|
||
|
|
struct device dev;
|
||
|
|
struct cdev chrdev;
|
||
|
|
int id;
|
||
|
|
struct device *mockdev;
|
||
|
|
struct module *owner;
|
||
|
|
struct gpio_chip *chip;
|
||
|
|
struct gpio_desc *descs;
|
||
|
|
int base;
|
||
|
|
u16 ngpio;
|
||
|
|
const char *label;
|
||
|
|
void *data;
|
||
|
|
struct list_head list;
|
||
|
|
struct blocking_notifier_head notifier;
|
||
|
|
struct rw_semaphore sem;
|
||
|
|
|
||
|
|
#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
|
||
|
|
};
|
||
|
|
|
||
|
|
static inline struct gpio_device *to_gpio_device(struct device *dev)
|
||
|
|
{
|
||
|
|
return container_of(dev, struct gpio_device, dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline struct gpio_device *gpio_device_get(struct gpio_device *gdev)
|
||
|
|
{
|
||
|
|
return to_gpio_device(get_device(&gdev->dev));
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void gpio_device_put(struct gpio_device *gdev)
|
||
|
|
{
|
||
|
|
put_device(&gdev->dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* gpio suffixes used for ACPI and device tree lookup */
|
||
|
|
static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" };
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct gpio_array - Opaque descriptor for a structure of GPIO array attributes
|
||
|
|
*
|
||
|
|
* @desc: Array of pointers to the GPIO descriptors
|
||
|
|
* @size: Number of elements in desc
|
||
|
|
* @chip: Parent GPIO chip
|
||
|
|
* @get_mask: Get mask used in fastpath
|
||
|
|
* @set_mask: Set mask used in fastpath
|
||
|
|
* @invert_mask: Invert mask used in fastpath
|
||
|
|
*
|
||
|
|
* This structure is attached to struct gpiod_descs obtained from
|
||
|
|
* gpiod_get_array() and can be passed back to get/set array functions in order
|
||
|
|
* to activate fast processing path if applicable.
|
||
|
|
*/
|
||
|
|
struct gpio_array {
|
||
|
|
struct gpio_desc **desc;
|
||
|
|
unsigned int size;
|
||
|
|
struct gpio_chip *chip;
|
||
|
|
unsigned long *get_mask;
|
||
|
|
unsigned long *set_mask;
|
||
|
|
unsigned long invert_mask[];
|
||
|
|
};
|
||
|
|
|
||
|
|
struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum);
|
||
|
|
|
||
|
|
#define for_each_gpio_desc(gc, desc) \
|
||
|
|
for (unsigned int __i = 0; \
|
||
|
|
__i < gc->ngpio && (desc = gpiochip_get_desc(gc, __i)); \
|
||
|
|
__i++) \
|
||
|
|
|
||
|
|
#define for_each_gpio_desc_with_flag(gc, desc, flag) \
|
||
|
|
for_each_gpio_desc(gc, desc) \
|
||
|
|
if (!test_bit(flag, &desc->flags)) {} else
|
||
|
|
|
||
|
|
int gpiod_get_array_value_complex(bool raw, bool can_sleep,
|
||
|
|
unsigned int array_size,
|
||
|
|
struct gpio_desc **desc_array,
|
||
|
|
struct gpio_array *array_info,
|
||
|
|
unsigned long *value_bitmap);
|
||
|
|
int gpiod_set_array_value_complex(bool raw, bool can_sleep,
|
||
|
|
unsigned int array_size,
|
||
|
|
struct gpio_desc **desc_array,
|
||
|
|
struct gpio_array *array_info,
|
||
|
|
unsigned long *value_bitmap);
|
||
|
|
|
||
|
|
extern spinlock_t gpio_lock;
|
||
|
|
extern struct list_head gpio_devices;
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct gpio_desc - Opaque descriptor for a GPIO
|
||
|
|
*
|
||
|
|
* @gdev: Pointer to the parent GPIO device
|
||
|
|
* @flags: Binary descriptor flags
|
||
|
|
* @label: Name of the consumer
|
||
|
|
* @name: Line name
|
||
|
|
* @hog: Pointer to the device node that hogs this line (if any)
|
||
|
|
* @debounce_period_us: Debounce period in microseconds
|
||
|
|
*
|
||
|
|
* These are obtained using gpiod_get() and are preferable to the old
|
||
|
|
* integer-based handles.
|
||
|
|
*
|
||
|
|
* Contrary to integers, a pointer to a &struct gpio_desc is guaranteed to be
|
||
|
|
* valid until the GPIO is released.
|
||
|
|
*/
|
||
|
|
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_IRQ_IS_ENABLED 10 /* GPIO is connected to an enabled IRQ */
|
||
|
|
#define FLAG_IS_HOGGED 11 /* GPIO is hogged */
|
||
|
|
#define FLAG_TRANSITORY 12 /* GPIO may lose value in sleep or reset */
|
||
|
|
#define FLAG_PULL_UP 13 /* GPIO has pull up enabled */
|
||
|
|
#define FLAG_PULL_DOWN 14 /* GPIO has pull down enabled */
|
||
|
|
#define FLAG_BIAS_DISABLE 15 /* GPIO has pull disabled */
|
||
|
|
#define FLAG_EDGE_RISING 16 /* GPIO CDEV detects rising edge events */
|
||
|
|
#define FLAG_EDGE_FALLING 17 /* GPIO CDEV detects falling edge events */
|
||
|
|
#define FLAG_EVENT_CLOCK_REALTIME 18 /* GPIO CDEV reports REALTIME timestamps in events */
|
||
|
|
#define FLAG_EVENT_CLOCK_HTE 19 /* GPIO CDEV reports hardware timestamps in events */
|
||
|
|
|
||
|
|
/* Connection label */
|
||
|
|
const char *label;
|
||
|
|
/* Name of the GPIO */
|
||
|
|
const char *name;
|
||
|
|
#ifdef CONFIG_OF_DYNAMIC
|
||
|
|
struct device_node *hog;
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_GPIO_CDEV
|
||
|
|
/* debounce period in microseconds */
|
||
|
|
unsigned int debounce_period_us;
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
#define gpiod_not_found(desc) (IS_ERR(desc) && PTR_ERR(desc) == -ENOENT)
|
||
|
|
|
||
|
|
int gpiod_request(struct gpio_desc *desc, const char *label);
|
||
|
|
void gpiod_free(struct gpio_desc *desc);
|
||
|
|
|
||
|
|
static inline int gpiod_request_user(struct gpio_desc *desc, const char *label)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = gpiod_request(desc, label);
|
||
|
|
if (ret == -EPROBE_DEFER)
|
||
|
|
ret = -ENODEV;
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
|
||
|
|
unsigned long lflags, enum gpiod_flags dflags);
|
||
|
|
int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce);
|
||
|
|
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];
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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(gc, fmt, ...) \
|
||
|
|
dev_emerg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
|
||
|
|
#define chip_crit(gc, fmt, ...) \
|
||
|
|
dev_crit(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
|
||
|
|
#define chip_err(gc, fmt, ...) \
|
||
|
|
dev_err(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
|
||
|
|
#define chip_warn(gc, fmt, ...) \
|
||
|
|
dev_warn(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
|
||
|
|
#define chip_info(gc, fmt, ...) \
|
||
|
|
dev_info(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
|
||
|
|
#define chip_dbg(gc, fmt, ...) \
|
||
|
|
dev_dbg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
|
||
|
|
|
||
|
|
#endif /* GPIOLIB_H */
|