linux-stable/include/linux/gpio/machine.h
Shobhit Kumar be9015abb8 gpiolib: Add support for removing registered consumer lookup table
In case we unload and load a driver module again that is registering a
lookup table, without this it will result in multiple entries. Provide
an option to remove the lookup table on driver unload

Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2015-07-21 09:21:40 +02:00

62 lines
1.9 KiB
C

#ifndef __LINUX_GPIO_MACHINE_H
#define __LINUX_GPIO_MACHINE_H
#include <linux/types.h>
#include <linux/list.h>
enum gpio_lookup_flags {
GPIO_ACTIVE_HIGH = (0 << 0),
GPIO_ACTIVE_LOW = (1 << 0),
GPIO_OPEN_DRAIN = (1 << 1),
GPIO_OPEN_SOURCE = (1 << 2),
};
/**
* struct gpiod_lookup - lookup table
* @chip_label: name of the chip the GPIO belongs to
* @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO
* @con_id: name of the GPIO from the device's point of view
* @idx: index of the GPIO in case several GPIOs share the same name
* @flags: mask of GPIO_* values
*
* gpiod_lookup is a lookup table for associating GPIOs to specific devices and
* functions using platform data.
*/
struct gpiod_lookup {
const char *chip_label;
u16 chip_hwnum;
const char *con_id;
unsigned int idx;
enum gpio_lookup_flags flags;
};
struct gpiod_lookup_table {
struct list_head list;
const char *dev_id;
struct gpiod_lookup table[];
};
/*
* Simple definition of a single GPIO under a con_id
*/
#define GPIO_LOOKUP(_chip_label, _chip_hwnum, _con_id, _flags) \
GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, 0, _flags)
/*
* Use this macro if you need to have several GPIOs under the same con_id.
* Each GPIO needs to use a different index and can be accessed using
* gpiod_get_index()
*/
#define GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, _idx, _flags) \
{ \
.chip_label = _chip_label, \
.chip_hwnum = _chip_hwnum, \
.con_id = _con_id, \
.idx = _idx, \
.flags = _flags, \
}
void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);
#endif /* __LINUX_GPIO_MACHINE_H */