To whom it may concern:
I am having trouble with the Silicon Labs CP2105 (usb serial driver
cp210x) enumerating both USB interfaces.
When the CP2105-EK evaluation board is connected to the PC, Linux only
creates a `/dev/ttyUSB0` device, but no `/dev/ttyUSB1` device is
created. Upon unplugging the
Sounds good. I was reading here (https://lwn.net/Articles/434833/)
about the dev_dbg() function. Any ideas what I should do to enable
this type of debugging on Debian Linux? I should mention that I've
never built the kernel from source before. :)
Thanks,
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After debugging further, I figured out what was causing the problem.
In the driver for the cp210x, there is a line of code in the `.attach`
function that calls `usb_reset_device(serial->dev);`. See the source
code here:
https://github.com/torvalds/linux/blob/master/drivers/usb/serial/cp210x.c#L8
terfaces are properly detected the first time. :) Any
thoughts?
Thanks,
Blake
On Fri, May 16, 2014 at 2:47 AM, Jidong Xiao wrote:
> On Thu, May 15, 2014 at 6:53 PM, Miner, Blake wrote:
>> After debugging further, I figured out what was causing the problem.
>>
>> In the dr
Fri, 16 May 2014, Miner, Blake wrote:
>
>> > I am not sure about this, but I wonder can we do the reset in
>> > cp210x_open() instead of in cp210x_startup()?
>>
>> Possibly, but I'd rather perform the reset just once, right when the
>> device is detected
ld be the best
> patch, although we have not gone through any regression testing yet to prove
> that is the case and I don't know the implications within the Linux kernel
> itself - but from a pure device standpoint it's not necessary.
>
> Kind Regards -
> Preston
>
&
wrote:
> On Fri, 16 May 2014, Miner, Blake wrote:
>
>> Thanks to everyone who helped me with my first kernel patch. Please
>> see the patch in the link below. If any revisions are necessary,
>> please let me know. Thanks!
>>
>> http://sweetamandas.com/cp210x.patc
