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| author | Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2014-03-31 13:27:10 -0400 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2014-04-07 09:55:25 +0200 |
| commit | e24d0d399b2fce71b627043e900ef28283850482 (patch) | |
| tree | 94ffabba4678d9e9bdcd77564043735a7fd96edb /drivers/hid/hid-core.c | |
| parent | f3b0cbce01cd5c242b420d986b208d306bdc5083 (diff) | |
| download | lwn-e24d0d399b2fce71b627043e900ef28283850482.tar.gz lwn-e24d0d399b2fce71b627043e900ef28283850482.zip | |
HID: core: do not scan constant input report
The Microsoft Surface Type/Touch Cover 2 is a fancy device which advertised
itself as a multitouch device but with constant input reports.
This way, hid_scan_report() gives the group MULTITOUCH to it, but
hid-multitouch can not handle it due to the constant collection ignored
by hid-input.
To prevent such crap in the future, and while we do not fix this particular
device, make the scan_report coherent with hid-input.c, and ignore constant
input reports.
CC: stable@vger.kernel.org # 3.12+
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-core.c')
| -rw-r--r-- | drivers/hid/hid-core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 3f488ff88e0c..10a2c0866459 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -718,6 +718,9 @@ static int hid_scan_main(struct hid_parser *parser, struct hid_item *item) case HID_MAIN_ITEM_TAG_END_COLLECTION: break; case HID_MAIN_ITEM_TAG_INPUT: + /* ignore constant inputs, they will be ignored by hid-input */ + if (data & HID_MAIN_ITEM_CONSTANT) + break; for (i = 0; i < parser->local.usage_index; i++) hid_scan_input_usage(parser, parser->local.usage[i]); break; |