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authorAndrew Duggan <aduggan@synaptics.com>2014-12-12 10:17:26 -0800
committerJiri Kosina <jkosina@suse.cz>2014-12-17 09:13:13 +0100
commite39f2d5956999c05c85814787a113ffadbcd4b26 (patch)
tree55bf92a52e0b733a5c4ca7547e6b74b83de0083a /drivers/hid
parent0349678ccd74d16c1f2bb58ecafec13ef7110e36 (diff)
downloadop-kernel-dev-e39f2d5956999c05c85814787a113ffadbcd4b26.zip
op-kernel-dev-e39f2d5956999c05c85814787a113ffadbcd4b26.tar.gz
HID: rmi: Scan the report descriptor to determine if the device is suitable for the hid-rmi driver
On composite HID devices there may be multiple HID devices on separate interfaces, but hid-rmi should only bind to the touchpad. The previous version simply checked that the interface protocol was set to mouse. Unfortuately, it is not always the case that the touchpad has the mouse interface protocol set. This patch takes a different approach and scans the report descriptor looking for the Generic Desktop Pointer usage and the Vendor Specific Top Level Collection needed by the hid-rmi driver to interface with the device. Signed-off-by: Andrew Duggan <aduggan@synaptics.com> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-core.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index c3d0ac1..81665b4 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -698,6 +698,7 @@ static void hid_scan_feature_usage(struct hid_parser *parser, u32 usage)
static void hid_scan_collection(struct hid_parser *parser, unsigned type)
{
struct hid_device *hid = parser->device;
+ int i;
if (((parser->global.usage_page << 16) == HID_UP_SENSOR) &&
type == HID_COLLECTION_PHYSICAL)
@@ -707,6 +708,14 @@ static void hid_scan_collection(struct hid_parser *parser, unsigned type)
hid->product == USB_DEVICE_ID_MS_TYPE_COVER_3 &&
hid->group == HID_GROUP_MULTITOUCH)
hid->group = HID_GROUP_GENERIC;
+
+ if ((parser->global.usage_page << 16) == HID_UP_GENDESK)
+ for (i = 0; i < parser->local.usage_index; i++)
+ if (parser->local.usage[i] == HID_GD_POINTER)
+ parser->scan_flags |= HID_SCAN_FLAG_GD_POINTER;
+
+ if ((parser->global.usage_page << 16) >= HID_UP_MSVENDOR)
+ parser->scan_flags |= HID_SCAN_FLAG_VENDOR_SPECIFIC;
}
static int hid_scan_main(struct hid_parser *parser, struct hid_item *item)
@@ -792,11 +801,14 @@ static int hid_scan_report(struct hid_device *hid)
hid->group = HID_GROUP_WACOM;
break;
case USB_VENDOR_ID_SYNAPTICS:
- if ((hid->group == HID_GROUP_GENERIC) &&
- (hid->bus != BUS_USB || hid->type == HID_TYPE_USBMOUSE))
- /* hid-rmi should only bind to the mouse interface of
- * composite USB devices */
- hid->group = HID_GROUP_RMI;
+ if (hid->group == HID_GROUP_GENERIC)
+ if ((parser->scan_flags & HID_SCAN_FLAG_VENDOR_SPECIFIC)
+ && (parser->scan_flags & HID_SCAN_FLAG_GD_POINTER))
+ /*
+ * hid-rmi should take care of them,
+ * not hid-generic
+ */
+ hid->group = HID_GROUP_RMI;
break;
}
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