On Wed, 10 Jun 2009, Bastien Nocera wrote:

quoted

quoted

I just got an Apple Bluetooth Mighty Mouse, and was wondering whether 
anyone had information on how to get the battery level from the device 
(the keyboard apparently also allows that): 
http://support.apple.com/kb/TA27118?viewlocale=en_US
Anyone with an idea? An unparsed HID event? Does it need "poking"?

If the mouse is standard-compliant, it should be sending the battery level 
strength in usage 0x20 of device controls page (0x06).
Could you please obtain HID debug dump (CONFIG_HID_DEBUG + modprobe hid 
module with 'debug=2')

I found that for pretty much all the input problems, I'd need to do
something like that. Problem is:
- enabling CONFIG_HID_DEBUG requires rebuilding the kernel

CONFIG_HID_DEBUG has 'default y' for quite some time, but the defconfigs 
haven't unfortunately been updated yet.

- most distributions build hid into the kernel

hid.debug=2 on the kernel commandline option does the trick.

Wouldn't there be a way to enable the debug at run-time without 
impacting too much on performance or binary size?

Absolutely. I have a migration of all this stuff to debugfs on my TODO 
list.

Thanks,

-- 
Jiri Kosina
SUSE Labs