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HID: multitouch: fix LG Melfas touchscreen

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The LG Melfas touchscreen has a bad firmware where it declares the Contact ID
field as constant while it shouldn't. This messes up the autodetection and the
reporting of the events by hid-multitouch given that hid-input ignores constant
fields.

The autodetection is simply worked around by manually adding the device to
hid_have_special_driver[].

The processing of the events requires either a report fixup, or some specific
case handling. Given that the report fixup would require to basically rewrite
all the report descriptor, I went for the programatic way of fixing that after
the report descriptors are loaded.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1416181
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires
2017-01-30 10:48:06 +01:00
committed by Jiri Kosina
parent 8e9faa1546
commit f3287a995a
3 changed files with 46 additions and 0 deletions
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1
drivers/hid/hid-ids.h
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@@ -633,6 +633,7 @@
#define USB_VENDOR_ID_LG 0x1fd2
#define USB_DEVICE_ID_LG_MULTITOUCH 0x0064
#define USB_DEVICE_ID_LG_MELFAS_MT 0x6007
#define USB_VENDOR_ID_LOGITECH 0x046d
#define USB_DEVICE_ID_LOGITECH_AUDIOHUB 0x0a0e