GPIO_HANDLE_SET_LINE_VALUES_IOCTL

Warning

This ioctl is part of GPIO Character Device Userspace API (v1) and is obsoleted by GPIO_V2_LINE_SET_VALUES_IOCTL.

Name

GPIO_HANDLE_SET_LINE_VALUES_IOCTL - Set the values of all requested output lines.

Synopsis

GPIO_HANDLE_SET_LINE_VALUES_IOCTL

int ioctl(int handle_fd, GPIO_HANDLE_SET_LINE_VALUES_IOCTL, struct gpiohandle_data *values)

Arguments

handle_fd

The file descriptor of the GPIO character device, as returned in the request.fd by GPIO_GET_LINEHANDLE_IOCTL.

values

The line_values to set.

Description

Set the values of all requested output lines.

The values set are logical, indicating if the line is to be active or inactive. The GPIOHANDLE_REQUEST_ACTIVE_LOW flag controls the mapping between logical values (active/inactive) and physical values (high/low). If GPIOHANDLE_REQUEST_ACTIVE_LOW is not set then active is high and inactive is low. If GPIOHANDLE_REQUEST_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 input lines 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.