How to implement support for "select" system call for a polling device driver

[Vanitha Ramaswami <vanitha@xxxxxxxxxxxxxxxxx>]

Hi All,

I need to implement "select" system call for a character device. The 
character device i am talking to doesnt not raise any interrupt when there 
is data. It just writes the data on the HPI bus.

Now for me to provide support for select, the poll_wait function should be 
waiting on a wait_queue and should be awakened by the Rx interrupt process. 
Is there a way to implement this other than creating a separate polling 
task(kernel_thread)  for receive, which continuously polls the device and 
awakes the wait queue when there is data?


Thanks
Vanitha

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