mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-12-27 12:21:22 -05:00
Code Issues Packages Projects Releases Wiki Activity

HID: multitouch: fix sticky fingers

Browse Source 
The sticky fingers quirk (MT_QUIRK_STICKY_FINGERS) was only considering
the case when slots were not released during the last report.
This can be problematic if the firmware forgets to release a finger
while others are still present.

This was observed on the Synaptics DLL0945 touchpad found on the Dell
XPS 9310 and the Dell Inspiron 5406.

Fixes: 4f4001bc76 ("HID: multitouch: fix rare Win 8 cases when the touch up event gets missing")
Cc: stable@vger.kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Benjamin Tissoires
2025-10-08 16:06:58 +02:00
committed by Jiri Kosina
parent aa4daea418
commit 46f781e0d1
1 changed files with 14 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/hid/hid-multitouch.c
View File

@@ -94,9 +94,8 @@ enum report_mode {
TOUCHPAD_REPORT_ALL = TOUCHPAD_REPORT_BUTTONS | TOUCHPAD_REPORT_CONTACTS,
};
#define MT_IO_FLAGS_RUNNING 0
#define MT_IO_FLAGS_ACTIVE_SLOTS 1
#define MT_IO_FLAGS_PENDING_SLOTS 2
#define MT_IO_SLOTS_MASK GENMASK(7, 0) /* reserve first 8 bits for slot tracking */
#define MT_IO_FLAGS_RUNNING 32
static const bool mtrue = true; /* default for true */
static const bool mfalse; /* default for false */
@@ -172,7 +171,11 @@ struct mt_device {
struct timer_list release_timer; /* to release sticky fingers */
struct hid_haptic_device *haptic; /* haptic related configuration */
struct hid_device *hdev; /* hid_device we're attached to */
unsigned long mt_io_flags; /* mt flags (MT_IO_FLAGS_*) */
unsigned long mt_io_flags; /* mt flags (MT_IO_FLAGS_RUNNING)
* first 8 bits are reserved for keeping the slot
* states, this is fine because we only support up
* to 250 slots (MT_MAX_MAXCONTACT)
*/
__u8 inputmode_value; /* InputMode HID feature value */
__u8 maxcontacts;
bool is_buttonpad; /* is this device a button pad? */
@@ -986,6 +989,7 @@ static void mt_release_pending_palms(struct mt_device *td,
for_each_set_bit(slotnum, app->pending_palm_slots, td->maxcontacts) {
clear_bit(slotnum, app->pending_palm_slots);
clear_bit(slotnum, &td->mt_io_flags);
input_mt_slot(input, slotnum);
input_mt_report_slot_inactive(input);
@@ -1019,12 +1023,6 @@ static void mt_sync_frame(struct mt_device *td, struct mt_application *app,
app->left_button_state = 0;
if (td->is_haptic_touchpad)
hid_haptic_pressure_reset(td->haptic);
if (test_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags))
set_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags);
else
clear_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags);
clear_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags);
}
static int mt_compute_timestamp(struct mt_application *app, __s32 value)
@@ -1202,7 +1200,9 @@ static int mt_process_slot(struct mt_device *td, struct input_dev *input,
input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
set_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags);
set_bit(slotnum, &td->mt_io_flags);
} else {
clear_bit(slotnum, &td->mt_io_flags);
}
return 0;
@@ -1337,7 +1337,7 @@ static void mt_touch_report(struct hid_device *hid,
* defect.
*/
if (app->quirks & MT_QUIRK_STICKY_FINGERS) {
if (test_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags))
if (td->mt_io_flags & MT_IO_SLOTS_MASK)
mod_timer(&td->release_timer,
jiffies + msecs_to_jiffies(100));
else
@@ -1814,6 +1814,7 @@ static void mt_release_contacts(struct hid_device *hid)
for (i = 0; i < mt->num_slots; i++) {
input_mt_slot(input_dev, i);
input_mt_report_slot_inactive(input_dev);
clear_bit(i, &td->mt_io_flags);
}
input_mt_sync_frame(input_dev);
input_sync(input_dev);
@@ -1836,7 +1837,7 @@ static void mt_expired_timeout(struct timer_list *t)
*/
if (test_and_set_bit_lock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
return;
if (test_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags))
if (td->mt_io_flags & MT_IO_SLOTS_MASK)
mt_release_contacts(hdev);
clear_bit_unlock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
}