HID: hid-multitouch: add support for Cypress TrueTouch panels

Added support for Cypress TrueTouch panels, which detect up to 10 fingers

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
Signed-off-by: Stéphane Chatty <chatty@enac.fr>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

4 files changed, 22 insertions, 0 deletions

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 511554de526e..de31d75e276f 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -293,6 +293,7 @@ config HID_MULTITOUCH
 
           Say Y here if you have one of the following devices:
           - PixCir touchscreen
+          - Cypress TrueTouch
 
 config HID_NTRIG
         tristate "N-Trig touch screen"
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 9292eb148ce4..12d4afafc73b 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1298,6 +1298,7 @@ static const struct hid_device_id hid_blacklist[] = {
         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2) },
         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3) },
         { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE) },
+        { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
         { 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) },
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index bd3cd551b4ee..f5657a8c757d 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -180,6 +180,7 @@
 #define USB_DEVICE_ID_CYPRESS_BARCODE_1 0xde61
 #define USB_DEVICE_ID_CYPRESS_BARCODE_2 0xde64
 #define USB_DEVICE_ID_CYPRESS_BARCODE_3 0xbca1
+#define USB_DEVICE_ID_CYPRESS_TRUETOUCH 0xc001
 
 #define USB_VENDOR_ID_DEALEXTREAME      0x10c5
 #define USB_DEVICE_ID_DEALEXTREAME_RADIO_SI4701 0x819a
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 3b05dfe910bc..7af9f7136bd5 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -32,6 +32,7 @@ MODULE_LICENSE("GPL");
 /* quirks to control the device */
 #define MT_QUIRK_NOT_SEEN_MEANS_UP      (1 << 0)
 #define MT_QUIRK_SLOT_IS_CONTACTID      (1 << 1)
+#define MT_QUIRK_CYPRESS        (1 << 2)
 
 struct mt_slot {
         __s32 x, y, p, w, h;
@@ -62,6 +63,7 @@ struct mt_class {
 /* classes of device behavior */
 #define MT_CLS_DEFAULT 0
 #define MT_CLS_DUAL1 1
+#define MT_CLS_CYPRESS 2
 
 /*
  * these device-dependent functions determine what slot corresponds
@@ -73,6 +75,14 @@ static int slot_is_contactid(struct mt_device *td)
         return td->curdata.contactid;
 }
 
+static int cypress_compute_slot(struct mt_device *td)
+{
+        if (td->curdata.contactid != 0 || td->num_received == 0)
+                return td->curdata.contactid;
+        else
+                return -1;
+}
+
 static int find_slot_from_contactid(struct mt_device *td)
 {
         int i;
@@ -95,6 +105,7 @@ static int find_slot_from_contactid(struct mt_device *td)
 struct mt_class mt_classes[] = {
         { 0, 0, 0, 10 },                             /* MT_CLS_DEFAULT */
         { MT_QUIRK_SLOT_IS_CONTACTID, 0, 0, 2 },     /* MT_CLS_DUAL1 */
+        { MT_QUIRK_CYPRESS | MT_QUIRK_NOT_SEEN_MEANS_UP, 0, 0, 10 }, /* MT_CLS_CYPRESS */
 };
 
 static void mt_feature_mapping(struct hid_device *hdev, struct hid_input *hi,
@@ -223,6 +234,9 @@ static int mt_compute_slot(struct mt_device *td)
         if (cls->quirks & MT_QUIRK_SLOT_IS_CONTACTID)
                 return slot_is_contactid(td);
 
+        if (cls->quirks & MT_QUIRK_CYPRESS)
+                return cypress_compute_slot(td);
+
         return find_slot_from_contactid(td);
 }
 
@@ -422,6 +436,11 @@ static void mt_remove(struct hid_device *hdev)
 
 static const struct hid_device_id mt_devices[] = {
 
+        /* Cypress panel */
+        { .driver_data = MT_CLS_CYPRESS,
+                HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS,
+                        USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
+
         /* PixCir-based panels */
         { .driver_data = MT_CLS_DUAL1,
                 HID_USB_DEVICE(USB_VENDOR_ID_HANVON,