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Hi Henrik.

On 07/02/2012 11:31 AM, Henrik Rydberg wrote:

Thank you for the thorough set of changes. Some minor comments 
below.

Will try to address the new ones soonish  :)

quoted

+	wrbuf[0] = 0xf5; +	wrbuf[1] = 0x0e; +	for (pos = *off; pos < 
endpos; pos += colbytes) { +		wrbuf[2] = pos / colbytes;  /* 
column index */ +		error = 
edt_ft5x06_ts_readwrite(tsdata->client, +						sizeof(wrbuf), 
wrbuf, +						colbytes, rdbuf); +		if (error) +			goto out; + + 
start_off = pos % colbytes; +		error = copy_to_user(buf + pos - 
*off, rdbuf + start_off, +				     MIN(colbytes - start_off, 
endpos - pos));

Quite a few variables in play here... it looks correct, but a) 
breaking out parts of this function would not hurt, and b) I bet 
the column-by column copy-to-user algorithm could be slightly less
 involved.

Hmm, I originally had it implemented as requiring offset == 0 as well
as buffer size big enough. That way it was as easy as the previous
sysfile implementation. I was unsure if this is acceptable though.

Not sure if dealing with the four possible cases independently would
improve things. I can only get the data in column-sized chunks and if
the buffer to fill is not properly aligned to these it will get a bit
messy.

I could allocate a temporary buffer for the whole raw frame, fill it
once (e.g. when offset == 0 or even on open()) and then just copy it
into the output buffer.

Maybe this is a more viable approach.

Bye,
        Simon

- -- 
       Simon Budig                        kernel concepts GmbH
       simon.budig@kernelconcepts.de      Sieghuetter Hauptweg 48
       +49-271-771091-17                  D-57072 Siegen

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