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| author | Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2013-08-22 14:51:08 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2013-08-27 10:00:00 +0200 |
| commit | f961bd3516e4f699bbacff5d7f5247d6d87c59f0 (patch) | |
| tree | ecc8cb61c11e00419a8fed6f277517c4f8aed711 /drivers/hid/hid-core.c | |
| parent | 3dc8fc083dbfeede7b63a0c07581192e97711365 (diff) | |
| download | lwn-f961bd3516e4f699bbacff5d7f5247d6d87c59f0.tar.gz lwn-f961bd3516e4f699bbacff5d7f5247d6d87c59f0.zip | |
HID: detect Win 8 multitouch devices in core
Detecting Win 8 multitouch devices in core allows us to set quirks
before the device is parsed through hid_hw_start().
It also simplifies the detection of those devices in hid-multitouch and
makes the handling of those devices cleaner.
As Win 8 multitouch panels are in the group multitouch and rely on a
special feature to be detected, this patch adds a bitfield in the parser.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Tested-by: Srinivas Pandruvada<srinivas.pandruvada@linux.intel.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 | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index ddd95f3e33c0..660dce964162 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -685,6 +685,13 @@ static void hid_scan_input_usage(struct hid_parser *parser, u32 usage) hid->group = HID_GROUP_MULTITOUCH; } +static void hid_scan_feature_usage(struct hid_parser *parser, u32 usage) +{ + if (usage == 0xff0000c5 && parser->global.report_count == 256 && + parser->global.report_size == 8) + parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8; +} + static void hid_scan_collection(struct hid_parser *parser, unsigned type) { struct hid_device *hid = parser->device; @@ -714,6 +721,8 @@ static int hid_scan_main(struct hid_parser *parser, struct hid_item *item) case HID_MAIN_ITEM_TAG_OUTPUT: break; case HID_MAIN_ITEM_TAG_FEATURE: + for (i = 0; i < parser->local.usage_index; i++) + hid_scan_feature_usage(parser, parser->local.usage[i]); break; } @@ -757,6 +766,13 @@ static int hid_scan_report(struct hid_device *hid) while ((start = fetch_item(start, end, &item)) != NULL) dispatch_type[item.type](parser, &item); + /* + * Handle special flags set during scanning. + */ + if ((parser->scan_flags & HID_SCAN_FLAG_MT_WIN_8) && + (hid->group == HID_GROUP_MULTITOUCH)) + hid->group = HID_GROUP_MULTITOUCH_WIN_8; + vfree(parser); return 0; } |