Re: Autosuspend problem - some explanation needed.

[Dave Mielke <dave@xxxxxxxxx>]

[quoted lines by Alan Stern on 2007/06/18 at 12:03 -0400]

>I shouldn't think it would be too much harder to read several sysfs
>files than a single usbfs file.  

Except that it starts to get messy if each system call is protected with error
checking and each piece of data read in as text is tested for validity. Perhaps
some or all such carefulness isn't necessary, but it does tend to protect
against unforeseen problems. It's much simpler to read it all in at once.

>Do you really need anything other than
>the vendor ID, the product ID, and perhaps the bcdDevice value?

That's mostly true for device selection. Once we know we have the right device,
though, we do use the string index fields to fetch the strings for logging. I
know the strings teemselves are in sysfs, but to keep that code portable we
read the string desccriptors from the selected device.

It was just an idea which would make switching back to a truly passive device
descriptor read (like it has been before autosuspend) easy, not only for us but
also for other applications.

-- 
Dave Mielke           | 2213 Fox Crescent | I believe that the Bible is the
Phone: 1-613-726-0014 | Ottawa, Ontario   | Word of God. Please contact me
EMail: dave@xxxxxxxxx | Canada  K2A 1H7   | if you're concerned about Hell.
http://FamilyRadio.com/                   | http://Mielke.cc/bible/

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