GPIO_V2_LINE_SET_VALUES_IOCTL¶
Name¶
GPIO_V2_LINE_SET_VALUES_IOCTL - Set the values of requested output lines.
Synopsis¶
- 
GPIO_V2_LINE_SET_VALUES_IOCTL¶
int ioctl(int req_fd, GPIO_V2_LINE_SET_VALUES_IOCTL, struct gpio_v2_line_values *values)
Arguments¶
- req_fd
- The file descriptor of the GPIO character device, as returned in the - request.fdby GPIO_V2_GET_LINE_IOCTL.
- values
- The - line_valuesto set with the- maskset to indicate the subset of requested lines to set and- bitsset to indicate the new value.
Description¶
Set the values of requested output lines.
The values set are logical, indicating if the line is to be active or inactive.
The GPIO_V2_LINE_FLAG_ACTIVE_LOW flag controls the mapping between logical
values (active/inactive) and physical values (high/low).
If GPIO_V2_LINE_FLAG_ACTIVE_LOW is not set then active is high and inactive
is low.  If GPIO_V2_LINE_FLAG_ACTIVE_LOW is set then active is low and
inactive is high.
Only the values of output lines may be set. Attempting to set the value of an input line is an error (EPERM).
Return Value¶
On success 0.
On error -1 and the errno variable is set appropriately.
Common error codes are described in GPIO Error Codes.