Hello,
I am trying to understand article on reverse engineering usb driver,
published in
http://www.linuxjournal.com/node/7353/print (2004)
I have difficulties understanding the input to the function usb_control_msg()
especially the 0x12, 0xc8 numbers.
I could not find them in the article, then tried even in the delcom
datasheet, but did not find it there too.
These numbers refer to __u8 request, __u8 requesttype , value, and
index, but I could not understand how they are figured it out in the
article.
usb_control_msg(led->udev,
usb_sndctrlpipe(led->udev, 0),
0x12, <<------- ?
0xc8, <<------ ?
(0x02 * 0x100) + 0x0a, <------ ?
(0x00 * 0x100) + color, <------ ?
buffer,
8,
2 * HZ);
Thanks for any comment,
Ran
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