Hi,
I am trying to make my touch screen work (Zalman HD160XT Plus) but I
could not find any suitable driver for it.
The Touch screen is an USB Device which consist of :
- a touch screen
- a knob
- few buttons in a front panel
- A remote control
lsusb -v
Bus 004 Device 004: ID 15c2:0034 SoundGraph Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x15c2 SoundGraph Inc.
idProduct 0x0034
bcdDevice 0.12
iManufacturer 0
iProduct 0
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 59
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Devices
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 2 Mouse
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.01
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 121
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Devices
bInterfaceSubClass 0 No Subclass
bInterfaceProtocol 0 None
iInterface 0
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.00
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 50
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Device Status: 0x0000
(Bus Powered)
I am currently running Ubuntu 7.10
Two input device are created when plugged:
lrwxrwxrwx 1 root root 9 2008-09-04 22:56 usb-15c2_0034-event-mouse
-> ../event1
lrwxrwxrwx 1 root root 9 2008-09-04 22:56 usb-15c2_0034-mouse
-> ../mouse1
As well as /dev/usb/hiddev0
The input device does give me anything usefull but the hiddev0 device
provide me some infos:
A packet seems to be 64 Bytes (in opposite two 2 * 8 Bytes according to
lsusb)
The knob and buttons seem quiet easily to decode:
Example knob -: (the 5th bytes is equal to 1)
[03 00 cd ff 01 00 00 00]
[04 00 cd ff 00 00 00 00]
[04 00 cd ff 00 00 00 00]
[04 00 cd ff 00 00 00 00]
[04 00 cd ff 00 00 00 00]
[04 00 cd ff 00 00 00 00]
[04 00 cd ff 12 00 00 00]
[04 00 cd ff ee ff ff ff]
Example knob -: (the 13th bytes is equal to 1)
[03 00 cd ff 00 00 00 00]
[04 00 cd ff 01 00 00 00]
[04 00 cd ff 00 00 00 00]
[04 00 cd ff 00 00 00 00]
[04 00 cd ff 00 00 00 00]
[04 00 cd ff 00 00 00 00]
[04 00 cd ff 12 00 00 00]
[04 00 cd ff ee ff ff ff]
For the front panel button the 29th bytes change (I suppose the remote
work the same way but I didn't try for a while)
For the touch screen it self, I did not manage to understand fully what
is been sent but my packet look like
[03 00 cd ff dd ff ff ff ...
with the 5th byte value changing according to Y (or X) axe and the 6th,
7th and 9th to FF
Does anybody know a driver capable to support this protocol.
If not, I am willing to write the drive for it but I will need a lot of
help too as I never wrote any driver before.
How does it work when the same device is used like a keyboard and a
touch screen ?
Why the wMaxPacketSize is set at 8 Bytes when the size seems to be 64 ?
Where should I start ?
Regards,
Xavier
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