On Wed 2020-10-28 17:29:23, Jiri Kosina wrote:
> On Wed, 28 Oct 2020, Pavel Machek wrote:
>
> > So no, I can't even replace it with equivalent one. Perhaps hrdc got
> > decompilation wrong, or I'm doing something else wrong.
>
> You don't need to do any decompilation -- the descriptor can be obtained
> from /sys/kernel/debug/hid/<device>/rdesc (also lsusb in verbose enough
> mode should present it in case no driver is bound to the device).
I discovered problem in the meantime. hrdc (I was using to de-compile
and re-compile hid descriptors) was adding padding.
But thanks for the pointer. That is very useful:
This device has four hat switches... I declared two so far
0x0b, 0x39, 0x00, 0x01, 0x00, // Usage (desktop.HatSwitch)
0x35, 0x00, // PhysicalMinimum (0)
0x46, 0x3b, 0x01, // PhysicalMaximum (315)
0x15, 0x01, // LogicalMinimum (1)
0x25, 0x08, // LogicalMaximum (8)
0x65, 0x14, // Unit (Degree)
0x55, 0x00, // UnitExponent (0)
0x95, 0x01, // ReportCount (1)
0x75, 0x04, // ReportSize (4)
0x81, 0x42, // Input (Variable|NullState)
0x95, 0x01, // ReportCount (1)
0x75, 0x02, // ReportSize (2)
0x81, 0x03, // Input (Constant|Variable)
0x0b, 0x39, 0x00, 0x01, 0x00, // Usage (desktop.HatSwitch)
0x35, 0x00, // PhysicalMinimum (0)
0x46, 0x3b, 0x01, // PhysicalMaximum (315)
0x15, 0x01, // LogicalMinimum (1)
0x25, 0x08, // LogicalMaximum (8)
0x65, 0x14, // Unit (Degree)
0x55, 0x00, // UnitExponent (0)
0x95, 0x01, // ReportCount (1)
0x75, 0x04, // ReportSize (4)
0x81, 0x42, // Input (Variable|NullState)
0xc0, // EndCollection
...but Linux seems to only recognize first of them:
GenericDesktop.HatSwitch ---> Absolute.Hat0X
GenericDesktop.HatSwitch ---> Sync.Report
Is there way to get extra hats mapped as Hat1X, Hat2X and Hat3X?
(Plus, they may have different bit orders than hid expects...?)
I'm thinking that maybe I should ignore this hid stuff and just do
"normal" driver in C? Is there precedent/example for that?
Best regards,
Pavel
--
http://www.livejournal.com/~pavelmachek
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