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923a82a6bc
commit 88f38846bfb1a452a3d47e38aeab20a4ceb74294 upstream.
The `wacom_feature_mapping` function is careful to only set the the
touch_max value a single time, but this care does not extend to the
`wacom_wac_finger_event` function. In particular, if a device sends
multiple HID_DG_CONTACTMAX items in a single feature report, the
driver will end up retaining the value of last item.
The HID descriptor for the Cintiq Companion 2 does exactly this. It
incorrectly sets a "Report Count" of 2, which will cause the driver
to process two HID_DG_CONTACTCOUNT items. The first item has the actual
count, while the second item should have been declared as a constant
zero. The constant zero is the value the driver ends up using, however,
since it is the last HID_DG_CONTACTCOUNT in the report.
Report ID (16),
Usage (Contact Count Maximum), ; Contact count maximum (55h, static value)
Report Count (2),
Logical Maximum (10),
Feature (Variable),
To address this, we add a check that the touch_max is not already set
within the `wacom_wac_finger_event` function that processes the
HID_DG_TOUCHMAX item. We emit a warning if the value is set and ignore
the updated value.
This could potentially cause problems if there is a tablet which has
a similar issue but requires the last item to be used. This is unlikely,
however, since it would have to have a different non-zero value for
HID_DG_CONTACTMAX earlier in the same report, which makes no sense
except in the case of a firmware bug. Note that cases where the
HID_DG_CONTACTMAX items are in different reports is already handled
(and similarly ignored) by `wacom_feature_mapping` as mentioned above.
Link: https://github.com/linuxwacom/input-wacom/issues/223
Fixes:
|
||
|---|---|---|
| .. | ||
| i2c-hid | ||
| intel-ish-hid | ||
| usbhid | ||
| hid-a4tech.c | ||
| hid-accutouch.c | ||
| hid-alps.c | ||
| hid-apple.c | ||
| hid-appleir.c | ||
| hid-asus.c | ||
| hid-aureal.c | ||
| hid-axff.c | ||
| hid-belkin.c | ||
| hid-betopff.c | ||
| hid-bigbenff.c | ||
| hid-cherry.c | ||
| hid-chicony.c | ||
| hid-cmedia.c | ||
| hid-core.c | ||
| hid-corsair.c | ||
| hid-cougar.c | ||
| hid-cp2112.c | ||
| hid-creative-sb0540.c | ||
| hid-cypress.c | ||
| hid-debug.c | ||
| hid-dr.c | ||
| hid-elan.c | ||
| hid-elecom.c | ||
| hid-elo.c | ||
| hid-emsff.c | ||
| hid-ezkey.c | ||
| hid-gaff.c | ||
| hid-gembird.c | ||
| hid-generic.c | ||
| hid-gfrm.c | ||
| hid-glorious.c | ||
| hid-google-hammer.c | ||
| hid-gt683r.c | ||
| hid-gyration.c | ||
| hid-holtek-kbd.c | ||
| hid-holtek-mouse.c | ||
| hid-holtekff.c | ||
| hid-hyperv.c | ||
| hid-icade.c | ||
| hid-ids.h | ||
| hid-input.c | ||
| hid-ite.c | ||
| hid-jabra.c | ||
| hid-kensington.c | ||
| hid-keytouch.c | ||
| hid-kye.c | ||
| hid-lcpower.c | ||
| hid-led.c | ||
| hid-lenovo.c | ||
| hid-lg2ff.c | ||
| hid-lg3ff.c | ||
| hid-lg4ff.c | ||
| hid-lg4ff.h | ||
| hid-lg-g15.c | ||
| hid-lg.c | ||
| hid-lg.h | ||
| hid-lgff.c | ||
| hid-logitech-dj.c | ||
| hid-logitech-hidpp.c | ||
| hid-macally.c | ||
| hid-magicmouse.c | ||
| hid-maltron.c | ||
| hid-mcp2221.c | ||
| hid-mf.c | ||
| hid-microsoft.c | ||
| hid-monterey.c | ||
| hid-multitouch.c | ||
| hid-nti.c | ||
| hid-ntrig.c | ||
| hid-ortek.c | ||
| hid-penmount.c | ||
| hid-petalynx.c | ||
| hid-picolcd_backlight.c | ||
| hid-picolcd_cir.c | ||
| hid-picolcd_core.c | ||
| hid-picolcd_debugfs.c | ||
| hid-picolcd_fb.c | ||
| hid-picolcd_lcd.c | ||
| hid-picolcd_leds.c | ||
| hid-picolcd.h | ||
| hid-pl.c | ||
| hid-plantronics.c | ||
| hid-primax.c | ||
| hid-prodikeys.c | ||
| hid-quirks.c | ||
| hid-redragon.c | ||
| hid-retrode.c | ||
| hid-rmi.c | ||
| hid-roccat-arvo.c | ||
| hid-roccat-arvo.h | ||
| hid-roccat-common.c | ||
| hid-roccat-common.h | ||
| hid-roccat-isku.c | ||
| hid-roccat-isku.h | ||
| hid-roccat-kone.c | ||
| hid-roccat-kone.h | ||
| hid-roccat-koneplus.c | ||
| hid-roccat-koneplus.h | ||
| hid-roccat-konepure.c | ||
| hid-roccat-kovaplus.c | ||
| hid-roccat-kovaplus.h | ||
| hid-roccat-lua.c | ||
| hid-roccat-lua.h | ||
| hid-roccat-pyra.c | ||
| hid-roccat-pyra.h | ||
| hid-roccat-ryos.c | ||
| hid-roccat-savu.c | ||
| hid-roccat-savu.h | ||
| hid-roccat.c | ||
| hid-saitek.c | ||
| hid-samsung.c | ||
| hid-sensor-custom.c | ||
| hid-sensor-hub.c | ||
| hid-sjoy.c | ||
| hid-sony.c | ||
| hid-speedlink.c | ||
| hid-steam.c | ||
| hid-steelseries.c | ||
| hid-sunplus.c | ||
| hid-tivo.c | ||
| hid-tmff.c | ||
| hid-topseed.c | ||
| hid-twinhan.c | ||
| hid-u2fzero.c | ||
| hid-uclogic-core.c | ||
| hid-uclogic-params.c | ||
| hid-uclogic-params.h | ||
| hid-uclogic-rdesc.c | ||
| hid-uclogic-rdesc.h | ||
| hid-udraw-ps3.c | ||
| hid-viewsonic.c | ||
| hid-vivaldi.c | ||
| hid-waltop.c | ||
| hid-wiimote-core.c | ||
| hid-wiimote-debug.c | ||
| hid-wiimote-modules.c | ||
| hid-wiimote.h | ||
| hid-xinmo.c | ||
| hid-zpff.c | ||
| hid-zydacron.c | ||
| hidraw.c | ||
| Kconfig | ||
| Makefile | ||
| uhid.c | ||
| wacom_sys.c | ||
| wacom_wac.c | ||
| wacom_wac.h | ||
| wacom.h | ||