Date: Wed, 8 Nov 2023 11:01:19 +0100 From: Milan Obuch <freebsd-usb@dino.sk> To: freebsd-usb@freebsd.org Subject: Touch screen driver for Acer T231H1 Message-ID: <20231108110119.7fa5d462@zeta.dino.sk>
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Hi,
years ago I bought Acer monitor with touch screen, but did not try to
use it, it works for me just as an ordinary monitor. I decided to give
it a try now...
When plugged into USB port, I see just
kernel: ugen0.6: <AcerA Bell T231HlTouchScreen> at usbus0
line in console/dmesg output. Looking into usbconfig output in an
attempt to get some info, I see
# usbconfig -d ugen0.6 dump_all_desc
ugen0.6: <AcerA Bell T231HlTouchScreen> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON (500mA)
bLength = 0x0012
bDescriptorType = 0x0001
bcdUSB = 0x0110
bDeviceClass = 0x0000 <Probed by interface class>
bDeviceSubClass = 0x0000
bDeviceProtocol = 0x0000
bMaxPacketSize0 = 0x0040
idVendor = 0x0408
idProduct = 0x3001
bcdDevice = 0x0004
iManufacturer = 0x0001 <AcerA Bell>
iProduct = 0x0002 <T231HlTouchScreen>
iSerialNumber = 0x0000 <no string>
bNumConfigurations = 0x0001
Configuration index 0
bLength = 0x0009
bDescriptorType = 0x0002
wTotalLength = 0x0022
bNumInterfaces = 0x0001
bConfigurationValue = 0x0001
iConfiguration = 0x0000 <no string>
bmAttributes = 0x0080
bMaxPower = 0x00fa
Interface 0
bLength = 0x0009
bDescriptorType = 0x0004
bInterfaceNumber = 0x0000
bAlternateSetting = 0x0000
bNumEndpoints = 0x0001
bInterfaceClass = 0x0003 <HID device>
bInterfaceSubClass = 0x0000
bInterfaceProtocol = 0x0000
iInterface = 0x0000 <no string>
Additional Descriptor
bLength = 0x09
bDescriptorType = 0x21
bDescriptorSubType = 0x10
RAW dump:
0x00 | 0x09, 0x21, 0x10, 0x01, 0x00, 0x01, 0x22, 0xfd,
0x08 | 0x00
Endpoint 0
bLength = 0x0007
bDescriptorType = 0x0005
bEndpointAddress = 0x0083 <IN>
bmAttributes = 0x0003 <INTERRUPT>
wMaxPacketSize = 0x0040
bInterval = 0x0008
bRefresh = 0x0000
bSynchAddress = 0x0000
Googling for VID 0408 and PID 3001 I found it is Quanta Computer,
Optical Touch Screen. Fine. Now the question is, which driver should I
use for it? Anybody knows? Does it exist, could something existing be
adapted, should it be created from scratch? What info is necessary to
find out?
Regards,
Milan
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