greg wrote:
>On Sun, Aug 05, 2007 at 03:34:06PM -0500, David Hooker wrote:
>>
>> Hi-
>>
>> I have a device which has a CP2102 chip in it, and I see that the
>> kernel I'm using (2.6.22.1-27.fc7) has a usb serial driver for the
>> chip. My question is: how do I bind this driver to the device? Do I
>> have to add the device's product/vendor ID's to the id_table in the
>> code and rebuild my kernel? Or is there a way to associate the driver
>> with the device from the command line?
>
>You can echo the vendor and device id to the "new_id" file in the
>/sys/bus/usb-serial/drivers/cp2102/ directory.
>
>And you can send me a patch for the kernel so that it will be supported
>automatically in the future.
>
>thanks,
>
>greg k-h
Ok, thanks...
What is the format of the data I need to echo to that file?
I went ahead and added the line to the driver, and rebuilt my kernel. I'm a
complete noob when it comes to building kernels, etc... and I didn't see any
errors with the build. I don't have the output now, but I saw that it compiled
the cp2101.c file and there was an output line "LD [M] cp2101.ko". I checked
dmesg and saw:
usbcore: registered new interface driver usbserial
drivers/usb/serial/usb-serial.c: USB Serial support registered for generic
usbcore: registered new interface driver usbserial_generic
drivers/usb/serial/usb-serial.c: USB Serial Driver core
drivers/usb/serial/usb-serial.c: USB Serial support registered for cp2101
usbcore: registered new interface driver cp2101
drivers/usb/serial/cp2101.c: Silicon Labs CP2101/CP2102 RS232 serial adaptor
driver v0.07
hub 3-0:1.0: port 2 disabled by hub (EMI?), re-enabling...
usb 3-2: USB disconnect, address 8
usb 3-2: new full speed USB device using uhci_hcd and address 9
So I was assuming that my kernel build actually installed the new driver... is
that correct?
So then I was anticipating seeing dmesg output similar to this which I found in
a forum:
usb 3-3: new full speed USB device using ohci_hcd and address 3
CP2101 3-3:1.0: CP2101 converter detected
usb 3-3: reset full speed USB device using ohci_hcd and address 3
usb 3-3: CP2101 converter now attached to ttyUSB0
... but I didn't. I tried dis/re-connecting my device with the cp2102 in it,
and only saw this:
usb 3-2: USB disconnect, address 9
usb 3-2: new full speed USB device using uhci_hcd and address 10
usb 3-2: configuration #1 chosen from 1 choice
I tried rebooting, and same story. So I did a modprobe cp2101, which loaded
the driver and gave me the same messages in dmesg as when I rebuilt the kernel.
Then I did the echo of the vendor/product to new_id, and the device is now
recognized:
usb 3-2: cp2101 converter now attached to ttyUSB0
So that works. What did I do wrong with my change to the driver code and
rebuilding?
I simply added this line to the id_table:
{ USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher
Acceptor */
The echo to new_id I did was:
echo 0bed 1100 > /sys/bus/usb-serial/drivers/cp2101/new_id
Thanks.
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