Bluez APIs Help

Dear friends,

I am currently developing an application which involves Linux-Bluez
and Mobile Phones.

this is my algorithm

While(true)
{
1. Scan for Devices in Proximity
2. Create Connection
3. Extract RSSI Value
4. Disconnect
}

It is for a location based content delivery system..


My Problem-->>

The Scanning of Bluetooth Device in the proximity works and so the
the HCI connect and disconnect but it yeilds RSSI VALUE=0

what are the parameters of hci_read_rssi() function????

Is there an API reference site??

Please help me...

My project is Open Source.. but I cannot post incomplete source codes..