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.fd by GPIO_V2_GET_LINE_IOCTL.

values

The line_values to set with the mask set to indicate the subset of requested lines to set and bits set 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.