If a input device is opened before hid_hw_start is called, events may
not be received from the hardware. In the case of USB-backed devices,
for example, the hid_hw_start function is responsible for filling in
the URB which is submitted when the input device is opened. If a device
is opened prematurely, polling will never start because the device will
not have been in the correct state to send the URB.
Because the wacom driver registers its input devices before calling
hid_hw_start, there is a window of time where a device can be opened
and end up in an inoperable state. Some ARM-based Chromebooks in particular
reliably trigger this bug.
This commit splits the wacom_register_inputs function into two pieces.
One which is responsible for setting up the allocated inputs (and runs
prior to hid_hw_start so that devices are ready for any input events
they may end up receiving) and another which only registers the devices
(and runs after hid_hw_start to ensure devices can be immediately opened
without issue). Note that the functions to initialize the LEDs and remotes
are also moved after hid_hw_start to maintain their own dependency chains.
Fixes: 7704ac9373 ("HID: wacom: implement generic HID handling for pen generic devices")
Cc: stable@vger.kernel.org # v3.18+
Suggested-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Tested-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Even if a user does not use their AES pen for an extended period,
the battery power supply attributes continue to exist.
This results in the desktop showing battery status for a pen
that is no longer in use and which may in fact be in a different
state (e.g. the user may be charging the pen).
To avoid confusion and ensure userspace has an accurate view
of the battery state, this patch automatically removes
the power_supply after 30 minutes of inactivity.
Signed-off-by: Tatsunosuke Tobita <tatsunosuke.tobita@wacom.com>
Reviewed-by: Jason Gerecke <Jason.Gerecke@wacom.com>
Reviewed-by: Aaron Skomra <aaron.skomra@wacom.com>
Reviewed-by: Josh Dickens <joshua.dickens@wacom.com>
Link: https://lore.kernel.org/r/20231114235729.6867-1-tatsunosuke.wacom@gmail.com
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
Help differentiate the two remote related "serial" struct variables by
renaming "wacom_remote_data" to "wacom_remote_work_data".
Signed-off-by: Aaron Skomra <skomra@gmail.com>
Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
The 'connected' variable was poorly named, and this has led to some
confusion. We can get the same information by checking if a serial number
exists in the specified EKR slot.
Signed-off-by: Aaron Skomra <skomra@gmail.com>
Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Currently the EKR battery remains even after we stop getting information
from the device. This can lead to a stale battery persisting indefinitely
in userspace.
The remote sends a heartbeat every 10 seconds. Delete the battery if we
miss two heartbeats (after 21 seconds). Restore the battery once we see
a heartbeat again.
Signed-off-by: Aaron Skomra <skomra@gmail.com>
Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Fixes: 9f1015d45f ("HID: wacom: EKR: attach the power_supply on first connection")
CC: stable@vger.kernel.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Added a variable check and
transition in case of an error
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Denis Arefev <arefev@swemel.ru>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
The strscpy function is able to return an error code when a copy would
overflow the size of the destination. The copy is stopped and the buffer
terminated before overflow actually occurs so it is safe to continue
execution, but we should still produce a warning should this occur.
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Rather than creating batteries as part of the initial device probe, let's
make the process lazy. This gives us the opportunity to prevent batteries
from being created in situations where they are unnecessary.
There are two cases in particular where batteries are being unnecessarily
created at initialization. These are AES sensors (for which we don't know
any battery status information until a battery-powered pen actually comes
into prox) peripheral tablets which share HID descriptors between the
wired-only and wireless-capable SKUs of a family of devices.
This patch will delay battery initialization of the former until a pen
actually comes into prox. It will delay battery initialization of the
latter until either a pen comes into prox or a "heartbeat" packet is
processed.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217062
Link: https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/2354
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Tested-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Some Wacom devices have a special "bootloader" mode that is used for
firmware flashing. When operating in this mode, the device cannot be
used for input, and the HID descriptor is not able to be processed by
the driver. The driver generates an "Unknown device_type" warning and
then returns an error code from wacom_probe(). This is a problem because
userspace still needs to be able to interact with the device via hidraw
to perform the firmware flash.
This commit adds a non-generic device definition for 056a:0094 which
is used when devices are in "bootloader" mode. It marks the devices
with a special BOOTLOADER type that is recognized by wacom_probe() and
wacom_raw_event(). When we see this type we ensure a hidraw device is
created and otherwise keep our hands off so that userspace is in full
control.
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Tested-by: Tatsunosuke Tobita <tatsunosuke.tobita@wacom.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Follow the advice of the below link and prefer 'strscpy' in this
subsystem. Conversion is 1:1 because the return value is not used.
Generated by a coccinelle script.
Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Remove a left-over from commit 2874c5fd28 ("treewide: Replace GPLv2
boilerplate/reference with SPDX - rule 152").
An empty comment block can be removed.
While at it remove, also remove what is supposed to be the path/filename of
the file.
This is really low value... and wrong since commit 471d17148c
("Input: wacom - move the USB (now hid) Wacom driver in drivers/hid")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Prox-out events may not be reliably sent by some AES firmware. This can
cause problems for users, particularly due to arbitration logic disabling
touch input while the pen is in prox.
This commit adds a timer which is reset every time a new prox event is
received. When the timer expires we check to see if the pen is still in
prox and force it out if necessary. This is patterend off of the same
solution used by 'hid-letsketch' driver which has a similar problem.
Link: https://github.com/linuxwacom/input-wacom/issues/310
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Touch switch state is received through WACOM_PAD_FIELD. However, it
is reported by touch_input. Don't register pad_input if no other pad
events require the interface.
Cc: stable@vger.kernel.org
Signed-off-by: Ping Cheng <ping.cheng@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
POWER_SUPPLY_TYPE_USB seems to only ever be used by USB ports that are
used to charge the machine itself (so a "system" scope), like the
single USB port on a phone, rather than devices.
The wacom_sys driver is the only driver that sets its device battery as
being a USB type, which doesn't seem correct based on its usage, so
switch it to be a battery type like all the other USB-connected devices.
Signed-off-by: Bastien Nocera <hadess@hadess.net>
Acked-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
The wacom driver accepts devices of more than just USB types, but some
code paths can cause problems if the device being controlled is not a
USB device due to a lack of checking. Add the needed checks to ensure
that the USB device accesses are only happening on a "real" USB device,
and not one on some other bus.
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: linux-input@vger.kernel.org
Cc: stable@vger.kernel.org
Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211201183503.2373082-2-gregkh@linuxfoundation.org
A number of HID drivers already call hid_is_using_ll_driver() but only
for the detection of if this is a USB device or not. Make this more
obvious by creating hid_is_usb() and calling the function that way.
Also converts the existing hid_is_using_ll_driver() functions to use the
new call.
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: linux-input@vger.kernel.org
Cc: stable@vger.kernel.org
Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211201183503.2373082-1-gregkh@linuxfoundation.org
The helper function devm_add_action_or_reset() will internally
call devm_add_action(), and if devm_add_action() fails then it will
execute the action mentioned and return the error code. So
use devm_add_action_or_reset() instead of devm_add_action()
to simplify the error handling, reduce the code.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
The size of the critical section in this function appears to be larger
than necessary. The `wacom_udev_list_lock` exists to ensure that one
interface cannot begin checking if a shared object exists while a second
interface is doing the same (otherwise both could determine that no
object exists yet and create their own independent objects rather than
sharing just one). It should be safe for the critical section to end
once a fresly-allocated shared object would be found by other threads
(i.e., once it has been added to `wacom_udev_list`, which is looped
over by `wacom_get_hdev_data`).
This commit is a necessary pre-requisite for a later change to swap the
use of `devm_add_action` with `devm_add_action_or_reset`, which would
otherwise deadlock in its error case.
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Avoid doing unnecessary work when touch is disabled by detecting this
condition and returning early. Note that the probe process sends GET
FEATURE requests to discover e.g. HID_DG_CONTACTMAX, so we can't start
ignoring touch reports until probe finishes.
Signed-off-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Wacom touch devices have two types of touch switches: softkey touch
toggle and hardware touch switch. For softkey toggle, we assume
touch is on by default in the driver. However the hardware touch
switch is controlled by end users. We don't know if it's on or off
before getting the status event.
This patch sets touch off for devices with a hardware switch until we
get the status. This is a bit safer for users who leave the switch "off"
and don't want any accidental touches. The tradeoff is a slight delay
between device connection and touch becoming enabled for users who
leave the switch "on".
Signed-off-by: Ping Cheng <ping.cheng@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Tested-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Fixes the following W=1 kernel build warning(s):
drivers/hid/wacom_sys.c:1505: warning: Function parameter or member 'wacom' not described in 'wacom_led_next'
drivers/hid/wacom_sys.c:1505: warning: Function parameter or member 'cur' not described in 'wacom_led_next'
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: linux-input@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
The recent commit to fix a memory leak introduced an inadvertant NULL
pointer dereference. The `wacom_wac->pen_fifo` variable was never
intialized, resuling in a crash whenever functions tried to use it.
Since the FIFO is only used by AES pens (to buffer events from pen
proximity until the hardware reports the pen serial number) this would
have been easily overlooked without testing an AES device.
This patch converts `wacom_wac->pen_fifo` over to a pointer (since the
call to `devres_alloc` allocates memory for us) and ensures that we assign
it to point to the allocated and initalized `pen_fifo` before the function
returns.
Link: https://github.com/linuxwacom/input-wacom/issues/230
Fixes: 37309f47e2 ("HID: wacom: Fix memory leakage caused by kfifo_alloc")
CC: stable@vger.kernel.org # v4.19+
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Tested-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
These are never modified, so make them const to allow the compiler to put
them in read-only memory. It also allows the compiler to shrink the
resulting module with ~900 bytes, test-built with gcc 10.2 on x86_64.
text data bss dec hex filename
204377 42832 576 247785 3c7e9 drivers/hid/wacom_old.ko
204240 42064 576 246880 3c460 drivers/hid/wacom_new.ko
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
We've recently switched from extracting the value of HID_DG_CONTACTMAX
at a fixed offset (which may not be correct for all tablets) to
injecting the report into the driver for the generic codepath to handle.
Unfortunately, this change was made for *all* tablets, even those which
aren't generic. Because `wacom_wac_report` ignores reports from non-
generic devices, the contact count never gets initialized. Ultimately
this results in the touch device itself failing to probe, and thus the
loss of touch input.
This commit adds back the fixed-offset extraction for non-generic devices.
Link: https://github.com/linuxwacom/input-wacom/issues/155
Fixes: 184eccd403 ("HID: wacom: generic: read HID_DG_CONTACTMAX from any feature report")
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
CC: stable@vger.kernel.org # 5.3+
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
This is a common pattern in the HID drivers to reset the drvdata.
However, this is actually already handled by driver core, so there
is no need to do it manually.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Jason Gerecke <jason.gerecke@wacom.com>
Addresses a few issues that were noticed when compiling with non-default
warnings enabled. The trimmed-down warnings in the order they are fixed
below are:
* declaration of 'size' shadows a parameter
* '%s' directive output may be truncated writing up to 5 bytes into a
region of size between 1 and 64
* pointer targets in initialization of 'char *' from 'unsigned char *'
differ in signedness
* left shift of negative value
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
In the generic code path, HID_DG_CONTACTMAX was previously
only read from the second byte of report 0x23.
Another report (0x82) has the HID_DG_CONTACTMAX in the
higher nibble of the third byte. We should support reading the
value of HID_DG_CONTACTMAX no matter what report we are reading
or which position that value is in.
To do this we submit the feature report as a event report
using hid_report_raw_event(). Our modified finger event path
records the value of HID_DG_CONTACTMAX when it sees that usage.
Fixes: 8ffffd5212 ("HID: wacom: fix timeout on probe for some wacoms")
Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Based on 1 normalized pattern(s):
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-or-later
has been chosen to replace the boilerplate/reference in 3029 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Currently, the driver will attempt to set the mode on all
devices with a center button, but some devices with a center
button lack LEDs, and attempting to set the LEDs on devices
without LEDs results in the kernel error message of the form:
"leds input8::wacom-0.1: Setting an LED's brightness failed (-32)"
This is because the generic codepath erroneously assumes that the
BUTTON_CENTER usage indicates that the device has LEDs, the
previously ignored TOUCH_RING_SETTING usage is a more accurate
indication of the existence of LEDs on the device.
Fixes: 10c55cacb8 ("HID: wacom: generic: support LEDs")
Cc: <stable@vger.kernel.org> # v4.11+
Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
The 'wacom_hid_usage_quirk' function is the intended home for fixing
up descriptors that are buggy or that don't quite fit the mold. Commit
578325120e was supposed to move all of these quirks but it missed the
code to handle fixup the serial number usages for AES pens. Lets move
this code out of 'wacom_wac_pen_usage_mapping' where it was previously
lurking and put it into the same place as the others.
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
The function compare_device_paths from wacom_sys.c is generic
and useful for other drivers. Move the function to hid-core and
rename it as hid_compare_device_paths.
Signed-off-by: Daniel M. Lambea <dmlambea@gmail.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
We want to keep device-specific quirks as contained as possible so that the
the code remains maintainable. Our 'wacom_setup_device_quirks' function is
the usual place for this, but some quirks need to be applied to the HID
descriptor as it is parsed. This commit introduces a new function which is
called for each usage so that any HID-specific quirks can be applied. The
function now houses quirks that were being done in 'wacom_feature_mapping'
and 'wacom_usage_mapping'.
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Detecting the number of supported touches for a particular device used
to be tricky, both because early forms of the driver didn't have a very
good HID parser and because early hardware didn't always advertise the
actual number. At the time, we added a block of code which would ensure
that touch_max would always be equal to at least 1 on any touch device,
and relied on setting touch_max to e.g. 2 only for the multitouch-capable
exceptions.
The common case has since flipped, and the driver and descriptors can
reliably detect the number of touches supported by modern sensors.
Because of this, it makes sense to remove the fixup code and instead
place static declarations of "touch_max = 1" for these old devices. It
isn't entirely clear if all 2-finger devices actually report a maximum
number of touches so we leave these declarations still in place.
For the eagle-eyed, the "> BAMBOO_PT" condition was originally equivalent
to ">= TABLETPC", which is what the intent was. This commit doesn't have
to consider the types introduced in the interim since they shouldn't be
affected, hence why only the tablet PC definitions have been modified.
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Pull HID fixes from Jiri Kosina:
- Wacom 2nd-gen Intuos Pro large Y axis handling fix from Jason Gerecke
- fix for hibernation in Intel ISH driver, from Even Xu
- crash fix for hid-steam driver, from Rodrigo Rivas Costa
- new device ID addition to google-hammer driver
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid:
HID: wacom: Correct logical maximum Y for 2nd-gen Intuos Pro large
HID: intel_ish-hid: ipc: register more pm callbacks to support hibernation
HID: steam: use hid_device.driver_data instead of hid_set_drvdata()
HID: google: Add support for whiskers
The HID descriptor for the 2nd-gen Intuos Pro large (PTH-860) contains
a typo which defines an incorrect logical maximum Y value. This causes
a small portion of the bottom of the tablet to become unusable (both
because the area is below the "bottom" of the tablet and because
'wacom_wac_event' ignores out-of-range values). It also results in a
skewed aspect ratio.
To fix this, we add a quirk to 'wacom_usage_mapping' which overwrites
the data with the correct value.
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
CC: stable@vger.kernel.org # v4.10+
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Follow the change of return type u32 of hid_report_len,
fix all the types of variables those get the return value of
hid_report_len to u32, and all other code already uses u32.
Cc: stable@vger.kernel.org
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Background: ExpressKey Remotes communicate their events via usb dongle.
Each dongle can hold up to 5 pairings at one time and one EKR (identified
by its serial number) can unfortunately be paired with its dongle
more than once. The pairing takes place in a round-robin fashion.
Input devices are only created once per EKR, when a new serial number
is seen in the list of pairings. However, if a device is created for
a "higher" paring index and subsequently a second pairing occurs at a
lower pairing index, unpairing the remote with that serial number from
any pairing index will currently cause a driver crash. This occurs
infrequently, as two remotes are necessary to trigger this bug and most
users have only one remote.
As an illustration, to trigger the bug you need to have two remotes,
and pair them in this order:
1. slot 0 -> remote 1 (input device created for remote 1)
2. slot 1 -> remote 1 (duplicate pairing - no device created)
3. slot 2 -> remote 1 (duplicate pairing - no device created)
4. slot 3 -> remote 1 (duplicate pairing - no device created)
5. slot 4 -> remote 2 (input device created for remote 2)
6. slot 0 -> remote 2 (1 destroyed and recreated at slot 1)
7. slot 1 -> remote 2 (1 destroyed and recreated at slot 2)
8. slot 2 -> remote 2 (1 destroyed and recreated at slot 3)
9. slot 3 -> remote 2 (1 destroyed and not recreated)
10. slot 4 -> remote 2 (2 was already in this slot so no changes)
11. slot 0 -> remote 1 (The current code sees remote 2 was paired over in
one of the dongle slots it occupied and attempts
to remove all information about remote 2 [1]. It
calls wacom_remote_destroy_one for remote 2, but
the destroy function assumes the lowest index is
where the remote's input device was created. The
code "cleans up" the other remote 2 pairings
including the one which the input device was based
on, assuming they were were just duplicate
pairings. However, the cleanup doesn't call the
devres release function for the input device that
was created in slot 4).
This issue is fixed by this commit.
[1] Remote 2 should subsequently be re-created on the next packet from the
EKR at the lowest numbered slot that it occupies (here slot 1).
Fixes: f9036bd436 ("HID: wacom: EKR: use devres groups to manage resources")
Cc: stable <stable@vger.kernel.org> #4.9
Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Userspace expects to receive tool type and serial number information
for the active pen in the very first kernel report, if such data is
supported by the hardware. While this expectation is not an issue for
EMR devices, AES sensors will often send several packets worth of in-
range data before relaying type/serial data to the kernel. Sending this
data "late" can result in proximity-tracking issues by xf86-input-wacom,
or an inability to distinguish different pens by input-wacom.
Options for dealing with this situation include ignoring reports from
the tablet until we get the necessary data, or using the information
from the last-seen pen instead of the (eventual) real data. Neither
option is particularly attractive: the former results in truncated
strokes and the latter causes issues with switching between pens.
This commit instead opts to queue up events with missing information
until we receive a report which contains it. At that point, we can
update the driver's state variables (id[0] and serial[0]) and replay
the queued events.
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
- High resolution mode for DEll canvas support, from Benjamin Tissoires
- A lot of improvements to pen handling in the Wacom driver, from Jason Gerecke
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
The Dell Canvas exports 2 collections for the Pen part. The only
difference between the 2 is that the default one has half the resolution
of the second one.
The Windows driver switches the tablet into the second mode, so we should
behave the same.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
The wacom_get_hdev_data function is used to find and return a reference to
the "other half" of a Wacom device (i.e., the touch device associated with
a pen, or vice-versa). To ensure these references are properly accounted
for, the function is supposed to automatically increment the refcount before
returning. This was not done, however, for devices which have pen & touch
on different interfaces of the same USB device. This can lead to a WARNING
("refcount_t: underflow; use-after-free") when removing the module or device
as we call kref_put() more times than kref_get(). Triggering an "actual" use-
after-free would be difficult since both devices will disappear nearly-
simultaneously. To silence this warning and prevent the potential error, we
need to increment the refcount for all cases within wacom_get_hdev_data.
Fixes: 41372d5d40 ("HID: wacom: Augment 'oVid' and 'oPid' with heuristics for HID_GENERIC")
Cc: <stable@vger.kernel.org> # v4.9+
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Commit a50aac7193 introduces 'led.groups' and adds EKR support
for these groups. However, unlike the other devices with LEDs,
the EKR's LEDs are read-only and we shouldn't attempt to control
them in wacom_led_control().
See bug: https://sourceforge.net/p/linuxwacom/bugs/342/
Fixes: a50aac7193 ("HID: wacom: leds: dynamically allocate LED groups")
Cc: stable <stable@vger.kernel.org> # 4.9
Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
