Re: Writing HID driver for a USB phone handset IPEVO VP170 (0x1778:0x0403)

On Wed, 25 Apr 2007, Robin H. Johnson wrote:

> Notice the X and Y in the output. I have a detailed mapping of the keys below.
> [ 3479.472985] drivers/hid/hid-core.c: report (size 7) (unnumbered)
> [ 3479.472985] drivers/hid/hid-core.c: report 0 (size 7) =  f0 XX YY 00 00 00 00
> [ 3479.472985] hid-debug: input Consumer.00e9 = 0
> [ 3479.472985] hid-debug: input Consumer.00ea = 0
> [ 3479.472985] hid-debug: input Consumer.00e2 = 0
> [ 3479.472985] hid-debug: input Consumer.0000 = 0
> [ 3479.472985] hid-debug: input Consumer.0000 = 1
> [ 3479.472985] hid-debug: input Consumer.0000 = 1
> [ 3479.472985] hid-debug: input Consumer.0000 = 1
> [ 3479.472985] hid-debug: input Consumer.0000 = 1
> [ 3479.472985] hid-debug: input Consumer.0000 = XX
> [ 3479.472985] hid-debug: input Consumer.0000 = YY
> [ 3479.472985] hid-debug: input Consumer.0000 = 0
> [ 3479.472985] hid-debug: input Consumer.0000 = 0
> [ 3479.472985] hid-debug: input Consumer.0000 = 0
> [ 3479.472985] hid-debug: input Consumer.0000 = 0

Hi Robin,

this doesn't look particularly good. 

> YY is always 0..3, seems to be a small cycle counter (that wraps) over the
> scope of ALL buttons. Eg pressing Mute, then Keypad7 will increment the counter
> by two.
> XX mapping table (hex):
> 1c = 'Skype'
> c1 = 'Out'/+
> c3 = 'List'
> 1d = Selector-Up
> 1e = Selector-Down
> 1f = No/Onhook
> 20 = Yes/Offhook
> 2f = Mute
> f1 = Circle (GROUP 0)
> f2 = Diamond
> f3 = Square
> 32 = Volume Up
> 33 = Volume Down
> b0 = Keypad 0
> b1 = Keypad 1
> b2 = Keypad 2
> b3 = Keypad 3
> b4 = Keypad 4
> b5 = Keypad 5
> b6 = Keypad 6
> b7 = Keypad 7
> b8 = Keypad 8
> b9 = Keypad 9
> ba = Keypad *
> bb = Keypad #

This doesn't seem like it would be anyhow compatible with standardized HID 
Usage Tables - the codes are just different than what the standard 
specifies.

I'll inspect the report descriptor in a further detail and will let you 
know if there is a possibility how to fix this on-the-fly, but maybe 
writing a separate (userland, using hiddev or just-being-created hidraw 
interface) driver would be better.

Thanks for the report,

-- 
Jiri Kosina
SUSE Labs

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