Hi, I've got a GW Instek function generator (AFG-2225) that _appears_ like it should be a CDC-ACM device, but it seems to have a bug in it's descriptor. The same bug as Steven Ackerman had in this thread: http://comments.gmane.org/gmane.linux.usb.general/71225 (lsusb -v output at the bottom of this mail) However, unlike Steven, I can't fix the descriptor. (I guess GW Instek devs copied the same bad example code from renesas?) I tried "modprobe cdc-acm but other than a warning that the vid/pid args were unused, nothing happened. I don't have /dev/ttyACM* or /dev/serial/by-id/* and dmesg just shows... Oct 27 14:26:30 pojak kernel: cdc_acm: unknown parameter 'vendor' ignored Oct 27 14:26:30 pojak kernel: cdc_acm: unknown parameter 'product' ignored Oct 27 14:26:30 pojak kernel: usbcore: registered new interface driver cdc_acm Oct 27 14:26:30 pojak kernel: cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters <<< replug device here >>> Oct 27 14:35:41 pojak kernel: usb 3-4.1: USB disconnect, device number 12 Oct 27 14:35:43 pojak kernel: usb 3-4.1: new full-speed USB device number 13 using xhci_hcd Oct 27 14:35:44 pojak kernel: usb 3-4.1: New USB device found, idVendor=2184, idProduct=001c Oct 27 14:35:44 pojak kernel: usb 3-4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Oct 27 14:35:44 pojak kernel: usb 3-4.1: Product: AFG-2225 Oct 27 14:35:44 pojak kernel: usb 3-4.1: Manufacturer: GW IISTEK Oct 27 14:35:44 pojak kernel: usb 3-4.1: SerialNumber: GEN850317 Oct 27 14:35:44 pojak kernel: usb 3-4.1: ep 0x83 - rounding interval to 1024 microframes, ep desc...rames Oct 27 14:35:44 pojak mtp-probe[12215]: checking bus 3, device 13: "/sys/devices/pci0000:00/0000:0...4.1" Oct 27 14:35:44 pojak mtp-probe[12215]: bus: 3, device: 13 was not an MTP device The device appears as a regular serial port in windows, after installing the gw instek drivers. Those drivers are an .INF file only, with the following lines indicating that at least as far as they're concerned, the new and old devices are the same. (Old device listed as working here: http://www.tablix.org/~avian/blog/archives/2013/05/gw_instek_afg_2005/ %DESCRIPTION1%=DriverInstall, USB\VID_2184&PID_0011 %DESCRIPTION1%=DriverInstall, USB\VID_2184&PID_001C Is there anything I can do to get this to turn up as an ACM device in linux? Sincerely, Karl Palsson karlp@pojak:~$ sudo lsusb -v -d 2184: Bus 003 Device 012: ID 2184:001c GW Instek Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 2 Communications bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x2184 GW Instek idProduct 0x001c bcdDevice 1.00 iManufacturer 1 GW IISTEK iProduct 2 AFG-2225 iSerial 3 GEN850317 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 67 bNumInterfaces 2 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xc0 Self Powered MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 2 Communications vvv bInterfaceSubClass 32 ^^^ bInterfaceProtocol 0 iInterface 0 CDC Header: bcdCDC 1.10 CDC ACM: bmCapabilities 0x02 line coding and serial state CDC Union: bMasterInterface 0 bSlaveInterface 1 CDC Call Management: bmCapabilities 0x00 bDataInterface 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x83 EP 3 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 255 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 10 CDC Data bInterfaceSubClass 0 Unused bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 0 Device Status: 0x0000 (Bus Powered) karlp@pojak:~$ -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
