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HID: core: fix grouping by application 

commit f07b3c1da9 ("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@vger.kernel.org # v4.18+
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2018-09-04 15:31:14 +02:00 committed by Jiri Kosina
parent ec6adef5fb
commit 0d6c301140
3 changed files with 6 additions and 2 deletions
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4
drivers/hid/hid-input.c
View File

@ -1582,6 +1582,7 @@ 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);
@ -1677,8 +1678,7 @@ 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;
}

3
drivers/hid/hid-multitouch.c
View File

@ -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);

1
include/linux/hid.h
View File

@ -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 {