Updated CP2102 driver

[RWlodarczyk]

Good morning!

I'm looking to get an updated CP2102 driver. The fix that I'm looking for was merged into mainline on March 4, 2024 (see: https://github.com/torvalds/linux/commi ... 62ec8a3175). It seems to have been backported to kernel 6.1.86.

I'm running:
- Debian 12
- kernel version: 6.1.0-18-amd64

Is there a way that I can update the CP2102 driver?

Thank you,

Robert.

[kalle123]

What issues do you experience with the default CP2102 driver?

br KH

[RWlodarczyk]

Specifically my USB TTL device is one of these that has a different USB ID, covered in this case:

Code: Select all

{ USB_DEVICE(0x11CA, 0x0212) }, /* Verifone USB to Printer (UART, CP2102) */

So, when I plug in the device, I can't get it to mount to

Code: Select all

/dev/ttyUSB0

or similar. I tried writing a udev rule too, but that didn't work. It seems the driver doesn't even load.

[kalle123]

Have a assortment of those USB UART sticks here. FTDI 232, CP2102, CP2104, CH340 and PL2303.Experienced problems with fake FTDI and PL2303 sticks, but over the years not with the CP2102.

[RWlodarczyk]

Indeed, this is likely due to it being a fake CP2102, so the USB address is incorrect. I'm glad it got added upstream, but without porting that driver down, it'll be a while. In the meantime, I ordered a different USB TTL to dedicate to this project and have confirmed it works because it's a legit CP2102.

[kalle123]

Have to correct myself.

Think I do have one of the 'bad' CP2102s here.

We do some programming of small micro controllers like Arduinos or ATTinys and that one here was send over to me for a check, because the user could not flash firmware with that UART. But it is obvious, that the inscription on the chip has been erased.

Comparing this one and a 'good' one (right side) only showed these differences.