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March 2012

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by Swapnil Gaikwad March 1, 2012

March 1, 2012

Hello, I am new in kernel programming. Help me in following. I am trying to write module in ext4 filesystem that takes a inode of one file and copy it's metadata into one new inode. Problem is to how to request new inode and what are the fields of metadata we can copy. Also problem with the time created ,modified fields in metadata . -- Regards, Swapnil Gaikwad.

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Re: Linux cdc-acm-driver
by Manavendra Nath Manav March 1, 2012

March 1, 2012

Hi Johan On Wed, Feb 29, 2012 at 8:28 PM, Johan Hovold <jhovold(a)gmail.com> wrote: > On Sun, Feb 26, 2012 at 04:37:33PM +0100, Stefan Dreyer wrote: >> Hello Johan, >> >> i hope, you can help me. I try to get a barcode-Scanner (Metrologic >> Focus MS 1690) to work. If i take a look at the Windows driver, this >> scanner should work in serial-mode as CDC ACM. >> i have added the device: >> { USB_DEVICE(0x0c2e, 0x0720), /*Metro Metrologic MS7120 Barcode Scanner >> (bi-directional serial mode) */ >> }, >> >> and recompile the module. If i plug the device in, the module cdc-acm is >> loaded. But no device ttyACM0 appears. > > What does lsusb -v say? If it is a cdc-acm device you should not need to > add the pid/vid to the cdc-acm driver. > > What is written to the system logs? > >> Is there a possibility to debug the module? I would like to know, what >> happens. > > If your recompiling the module you can enable debugging by changing the > following "undef" > > #undef DEBUG > > to "define", or you can enable dynamic debugging (see > Documentation/dynamic-debug-howto.txt). > > Thanks, > Johan Sorry for jumping in the middle of the thread, but I too have a similar problem with Metrologic Focus MS1690 Barcode scanner. Currently, I am getting the device as bi-directional serial mode but I want to make it work as a USB HID Keyboard device. In the manufacturer's manual there is a barcode to configure the device as such. After this I can see from dmesg that first the device gets registered as USB HID v1.11 Keyboard, the I guess the scanner power cycles disconnecting the USB and again gets registered as a new device. *** dmesg snip *** [69818.065741] input: Honeywell Scanning and Mobility Honeywell Scanning and Mobility Scanner as /devices/pci0000:00/0000:00:1d.1/usb7/7-1/7-1:1.0/input/input6 [69818.065810] generic-usb 0003:0C2E:0200.0003: input,hidraw2: USB HID v1.11 Keyboard [Honeywell Scanning and Mobility Honeywell Scanning and Mobility Scanner] on usb-0000:00:1d.1-1/input0 [69823.804854] usb 7-1: USB disconnect, address 2 [69827.180717] usb 7-1: new low speed USB device using uhci_hcd and address 3 [69827.355585] usb 7-1: New USB device found, idVendor=0c2e, idProduct=0720 [69827.355590] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [69827.355593] usb 7-1: Product: Honeywell Scanning and Mobility Scanner [69827.355596] usb 7-1: Manufacturer: Honeywell Scanning and Mobility [root@pe1800xs ~]# lsusb -v Bus 007 Device 003: ID 0c2e:0720 Metro Metrologic MS7120 Barcode Scanner (bi-dir ectional serial mode) Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x0c2e Metro idProduct 0x0720 Metrologic MS7120 Barcode Scanner (bi-directional se rial mode) bcdDevice 1.00 iManufacturer 1 Honeywell Scanning and Mobility iProduct 2 Honeywell Scanning and Mobility Scanner iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 41 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 3 POS USB bmAttributes 0x80 (Bus Powered) MaxPower 450mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 ** UNRECOGNIZED: 09 21 11 01 00 01 22 3f 00 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 10 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 Device Status: 0x0000 (Bus Powered) [root@pe1800xs ~]# cat /proc/bus/usb/devices T: Bus=07 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 3 Spd=1.5 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0c2e ProdID=0720 Rev= 1.00 S: Manufacturer=Honeywell Scanning and Mobility S: Product=Honeywell Scanning and Mobility Scanner C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=450mA I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none) E: Ad=02(O) Atr=03(Int.) MxPS= 8 Ivl=10ms E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=10ms How to make this device work on Linux? Please note this link http://forums.gentoo.org/viewtopic-t-852806.html says that "They tracked it down to the scanner registering itself as a keyboard and then power cycling and registering as a custom POS device. I contacted the manufacturer and they sent me a barcode (99940) which when scanned locked the device into USB keyboard mode. It then worked fine as a standard keyboard." -- Manavendra Nath Manav

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