* @param value value to set (0 for low, non-zero for high)
* @return -1 on error, 0 if ok
*/
* @param value value to set (0 for low, non-zero for high)
* @return -1 on error, 0 if ok
*/
* @param output 0 to set as input, 1 to set as output
* @return -1 on error, 0 if ok
*/
* @param output 0 to set as input, 1 to set as output
* @return -1 on error, 0 if ok
*/