Re: QUANTA touchscreen controller integrated in HP2310ti no longer recognised (regression in 3.5 and later as compared to 3.3)

["Henrik Rydberg" <rydberg@bitmath.se>]

Hi Simon,

> We're going through our collection of touch screens, making sure that they all 
> work with current kernels, and we've found one that doesn't work with today's 
> Linus master.
> 
> lsusb describes the screen as:
> Bus 006 Device 002: ID 0408:3001 Quanta Computer, Inc. Optical Touch Screen

What about 0408:3008, does that one work?

> Any ideas on the best way to resolve this regression?

What does 'cat /sys/bus/hid/devices/0003:0408:3001.0001/modalias' say?

The patch below ought to be enough to make it work, although it is
still unclear why it is needed.

Thanks,
Henrik

---

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index bd4bc3c..2b775c3 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -963,7 +963,7 @@ static const struct hid_device_id mt_devices[] = {
                MT_USB_DEVICE(USB_VENDOR_ID_QUANTA,
                        USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH) },
        { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
-               MT_USB_DEVICE(USB_VENDOR_ID_QUANTA,
+               HID_USB_DEVICE(USB_VENDOR_ID_QUANTA,
                        USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001) },
        { .driver_data = MT_CLS_CONFIDENCE_CONTACT_ID,
                MT_USB_DEVICE(USB_VENDOR_ID_QUANTA,