USB HID: Add ID for eGalax Multitouch used in JooJoo tablet

The JooJoo tablet (http://thejoojoo.com/) contains an "eGalax Inc. USB
TouchController", and this patch hooks it up to the egalax-touch driver.
Without the patch we don't get any cursor motion, since it comes through
Z/RX rather than X/Y.

(The egalax-touch driver does not yet generate a correct event sequence
for the "serial" protocol used by this device, though -- see the note
added to the code, which comes from research by Stéphane Chatty.)

Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Stéphane Chatty <chatty@enac.fr>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

3 files changed, 11 insertions, 0 deletions

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index e635199a0cd2..0c52899be964 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1299,6 +1299,7 @@ static const struct hid_device_id hid_blacklist[] = {
         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE) },
         { HID_USB_DEVICE(USB_VENDOR_ID_DRAGONRISE, 0x0006) },
         { HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
+        { HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ELECOM, USB_DEVICE_ID_ELECOM_BM084) },
         { HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
         { HID_USB_DEVICE(USB_VENDOR_ID_GAMERON, USB_DEVICE_ID_GAMERON_DUAL_PSX_ADAPTOR) },
diff --git a/drivers/hid/hid-egalax.c b/drivers/hid/hid-egalax.c
index f44bdc084cb2..8ca7f65cf2f8 100644
--- a/drivers/hid/hid-egalax.c
+++ b/drivers/hid/hid-egalax.c
@@ -159,6 +159,13 @@ static int egalax_event(struct hid_device *hid, struct hid_field *field,
 {
         struct egalax_data *td = hid_get_drvdata(hid);
 
+        /* Note, eGalax has two product lines: the first is resistive and
+         * uses a standard parallel multitouch protocol (product ID ==
+         * 48xx).  The second is capacitive and uses an unusual "serial"
+         * protocol with a different message for each multitouch finger
+         * (product ID == 72xx).  We do not yet generate a correct event
+         * sequence for the capacitive/serial protocol.
+         */
         if (hid->claimed & HID_CLAIMED_INPUT) {
                 struct input_dev *input = field->hidinput->input;
 
@@ -246,6 +253,8 @@ static void egalax_remove(struct hid_device *hdev)
 static const struct hid_device_id egalax_devices[] = {
         { HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
                         USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
+        { HID_USB_DEVICE(USB_VENDOR_ID_DWAV,
+                        USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
         { }
 };
 MODULE_DEVICE_TABLE(hid, egalax_devices);
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index d3fc13ae094d..85c6d13c9ffa 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -188,6 +188,7 @@
 #define USB_VENDOR_ID_DWAV              0x0eef
 #define USB_DEVICE_ID_EGALAX_TOUCHCONTROLLER    0x0001
 #define USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH    0x480d
+#define USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1   0x720c
 
 #define USB_VENDOR_ID_ELECOM            0x056e
 #define USB_DEVICE_ID_ELECOM_BM084      0x0061