Name
hsi_register_port_event — 
     Register a client to receive port events
 
Synopsis
| int hsi_register_port_event ( | struct hsi_client * cl, | 
|  | void (*handler) (struct hsi_client *, unsigned long)); | 
 
Arguments
- cl
- 
     HSI client that wants to receive port events
     
- handler
- 
     Event handler callback
     
Description
   Clients should register a callback to be able to receive
   events from the ports. Registration should happen after
   claiming the port.
   The handler can be called in interrupt context.
   
   Returns -errno on error, or 0 on success.