commit f07b3c1da92d ("HID: generic: create one input report per
application type") was effectively the same as MULTI_INPUT:
hidinput->report was never set, so hidinput_match_application()
always returned null.
Fix that by testing against the real application.
Note that this breaks some old eGalax touchscreens that expect MULTI_INPUT
instead of HID_QUIRK_INPUT_PER_APP. Enable this quirk for backward
compatibility on all non-Win8 touchscreens.
link: https://bugzilla.kernel.org/show_bug.cgi?id=200847
link: https://bugzilla.kernel.org/show_bug.cgi?id=200849
link: https://bugs.archlinux.org/task/59699
link: https://github.com/NixOS/nixpkgs/issues/45165
Cc: stable@xxxxxxxxxxxxxxx # v4.18+
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
---
This replaces https://patchwork.kernel.org/patch/10583471/
A proper fix is better than a revert.
drivers/hid/hid-input.c | 4 ++--
drivers/hid/hid-multitouch.c | 3 +++
include/linux/hid.h | 1 +
3 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 1e9ba8f7a16b..907b08e50a9b 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -1588,6 +1588,7 @@ static struct hid_input *hidinput_allocate(struct hid_device *hid,
input_dev->dev.parent = &hid->dev;
hidinput->input = input_dev;
+ hidinput->application = application;
list_add_tail(&hidinput->list, &hid->inputs);
INIT_LIST_HEAD(&hidinput->reports);
@@ -1683,8 +1684,7 @@ static struct hid_input *hidinput_match_application(struct hid_report *report)
struct hid_input *hidinput;
list_for_each_entry(hidinput, &hid->inputs, list) {
- if (hidinput->report &&
- hidinput->report->application == report->application)
+ if (hidinput->application == report->application)
return hidinput;
}
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 88da991ef256..da954f3f4da7 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -1697,6 +1697,9 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
*/
hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
+ if (id->group != HID_GROUP_MULTITOUCH_WIN_8)
+ hdev->quirks |= HID_QUIRK_MULTI_INPUT;
+
timer_setup(&td->release_timer, mt_expired_timeout, 0);
ret = hid_parse(hdev);
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 834e6461a690..d44a78362942 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -526,6 +526,7 @@ struct hid_input {
const char *name;
bool registered;
struct list_head reports; /* the list of reports */
+ unsigned int application; /* application usage for this input */
};
enum hid_type {
--
2.14.3
