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gpio: uapi: define GPIO_MAX_NAME_SIZE for array sizes

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Replace constant array sizes with a macro constant to clarify the source
of array sizes, provide a place to document any constraints on the size,
and to simplify array sizing in userspace if constructing structs
from their composite fields.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Kent Gibson
2020-09-28 08:27:50 +08:00
committed by Bartosz Golaszewski
parent 69e4e13688
commit 539430fbbc
1 changed files with 11 additions and 6 deletions
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17
include/uapi/linux/gpio.h
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@@ -14,6 +14,11 @@
#include <linux/ioctl.h> #include <linux/ioctl.h>
#include <linux/types.h> #include <linux/types.h>
/*
* The maximum size of name and label arrays.
*/
#define GPIO_MAX_NAME_SIZE 32
/** /**
* struct gpiochip_info - Information about a certain GPIO chip * struct gpiochip_info - Information about a certain GPIO chip
* @name: the Linux kernel name of this GPIO chip * @name: the Linux kernel name of this GPIO chip
@@ -22,8 +27,8 @@
* @lines: number of GPIO lines on this chip * @lines: number of GPIO lines on this chip
*/ */
struct gpiochip_info { struct gpiochip_info {
char name[32]; char name[GPIO_MAX_NAME_SIZE];
char label[32]; char label[GPIO_MAX_NAME_SIZE];
__u32 lines; __u32 lines;
}; };
@@ -52,8 +57,8 @@ struct gpiochip_info {
struct gpioline_info { struct gpioline_info {
__u32 line_offset; __u32 line_offset;
__u32 flags; __u32 flags;
char name[32]; char name[GPIO_MAX_NAME_SIZE];
char consumer[32]; char consumer[GPIO_MAX_NAME_SIZE];
}; };
/* Maximum number of requested handles */ /* Maximum number of requested handles */
@@ -123,7 +128,7 @@ struct gpiohandle_request {
__u32 lineoffsets[GPIOHANDLES_MAX]; __u32 lineoffsets[GPIOHANDLES_MAX];
__u32 flags; __u32 flags;
__u8 default_values[GPIOHANDLES_MAX]; __u8 default_values[GPIOHANDLES_MAX];
char consumer_label[32]; char consumer_label[GPIO_MAX_NAME_SIZE];
__u32 lines; __u32 lines;
int fd; int fd;
}; };
@@ -182,7 +187,7 @@ struct gpioevent_request {
__u32 lineoffset; __u32 lineoffset;
__u32 handleflags; __u32 handleflags;
__u32 eventflags; __u32 eventflags;
char consumer_label[32]; char consumer_label[GPIO_MAX_NAME_SIZE];
int fd; int fd;
}; };