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gpio: uapi: improve description of fd fields 

Only a successful operation modifies fd fields, but the current
documentation wording could be taken to imply that a positive fd
value after an ioctl() returns indicates a success.

Reword documentation to clarify that the fd is only valid after a
successful operation.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Kent Gibson 2024-01-09 22:02:17 +08:00 committed by Bartosz Golaszewski
parent f4028860a9
commit 7889968e64
1 changed files with 6 additions and 9 deletions
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15
include/uapi/linux/gpio.h
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@ -189,9 +189,8 @@ struct gpio_v2_line_config {
* buffer. If this field is zero then the buffer size defaults to a minimum
* of @num_lines * 16.
* @padding: reserved for future use and must be zero filled
* @fd: if successful this field will contain a valid anonymous file handle
* after a %GPIO_GET_LINE_IOCTL operation, zero or negative value means
* error
* @fd: after a successful %GPIO_V2_GET_LINE_IOCTL operation, contains
* a valid anonymous file descriptor representing the request
*/
struct gpio_v2_line_request {
__u32 offsets[GPIO_V2_LINES_MAX];
@ -402,9 +401,8 @@ struct gpioline_info_changed {
* such as "my-bitbanged-relay"
* @lines: number of lines requested in this request, i.e. the number of
* valid fields in the above arrays, set to 1 to request a single line
* @fd: if successful this field will contain a valid anonymous file handle
* after a %GPIO_GET_LINEHANDLE_IOCTL operation, zero or negative value
* means error
* @fd: after a successful %GPIO_GET_LINEHANDLE_IOCTL operation, contains
* a valid anonymous file descriptor representing the request
*
* Note: This struct is part of ABI v1 and is deprecated.
* Use &struct gpio_v2_line_request instead.
@ -465,9 +463,8 @@ struct gpiohandle_data {
* %GPIOEVENT_REQUEST_RISING_EDGE or %GPIOEVENT_REQUEST_FALLING_EDGE
* @consumer_label: a desired consumer label for the selected GPIO line(s)
* such as "my-listener"
* @fd: if successful this field will contain a valid anonymous file handle
* after a %GPIO_GET_LINEEVENT_IOCTL operation, zero or negative value
* means error
* @fd: after a successful %GPIO_GET_LINEEVENT_IOCTL operation, contains a
* valid anonymous file descriptor representing the request
*
* Note: This struct is part of ABI v1 and is deprecated.
* Use &struct gpio_v2_line_request instead.