USB-Serial not visible on DS923+ (r1000)

[mgov1]

Hi,

I followed the procedure to install the drivers on my DS923+ (DSM 7.1.1-42962 Update 5). However I cannot find the usb device.

_|_1-3 067b:23a3:0305 00 2.00 12MBit/s 100mA 1IF (Prolific Technology Inc. USB-Serial Controller EKCEc19A321)

ls /dev | grep -i usb usb1 usb1p1

From what I found, the USB-Serial Controller should use the pl2303 driver.

What could be wrong?

[Koky05]

DSM 7.x do not support any USB drivers, only for storage. So if you want use it via USB you need to install by your self USB driver into it.

[robertklep]

@mgov1 did the pl2303 driver load without issues? What does lsusb | grep usbserial return? Also, can you post the full output of lsusb -cui?

[mgov1]

Hi @robertklep, yes the driver did load without issues as far as I can see. There is no output for "lsusb | grep usbserial". lsusb -cui |usb1 1d6b:0002:0404 09 2.00 480MBit/s 0mA 1IF (Linux 4.4.180+ xhci-hcd xHCI Host Controller 0000:06:00.3) hub |1-1 f400:f400:0100 00 2.00 480MBit/s 200mA 1IF (Synology DiskStation 650028A8202DF949) 1-1:1.0 (IF) 08:06:50 2EPs () usb-storage host7 (synoboot) |1-3 067b:23a3:0305 00 2.00 12MBit/s 100mA 1IF (Prolific Technology Inc. USB-Serial Controller EKCEc19A321) 1-3:1.0 (IF) ff:00:00 3EPs ()
|usb2 1d6b:0003:0404 09 3.00 5000MBit/s 0mA 1IF (Linux 4.4.180+ xhci-hcd xHCI Host Controller 0000:06:00.3) hub |__2-2 0bc2:2323:0000 00 3.00 5000MBit/s 144mA 1IF (Seagate Expansion+ NAAG7ZZR) 2-2:1.0 (IF) 08:06:50 2EPs () usb-storage host9 (usb1)

[robertklep]

If there's no output, the correct modules aren't loaded.

The provided script should load them, but you can try manually:

sudo insmod /lib/modules/usbserial.ko
sudo insmod /lib/modules/pl2303.ko

[mgov1]

$ sudo insmod /lib/modules/usbserial.ko Password: insmod: ERROR: could not insert module /lib/modules/usbserial.ko: File exists $ sudo insmod /lib/modules/pl2303.ko insmod: ERROR: could not insert module /lib/modules/pl2303.ko: File exist

[robertklep]

Okay, so that means the drivers have loaded properly.

If that doesn't yield any entries in /dev, it means your device isn't supported. I don't know why, but it could be that it requires a more recent driver than Synology provides.

[mgov1]

Thanks @robertklep, that might explain indeed. I guess the drivers for DSM 7.2 are the same?

[robertklep]

Yes, just compiled against a different toolchain version.

[mgov1]

On a windows system I just found that it's a (Prolific) PL2303GT device. I wonder if more people have had problems with this.

[Koky05]

I have problems after DSM upgrade so I made rmmod and then with drivers from DSM 7.2 folder insmod and it start work. Maybe it just need to remove and inert again after update of DSM.

[robertklep]

@mgov1 I found this post which suggests that the PL2023GT does indeed require an updated driver.

I'll try and see if I can manually update the driver.

[robertklep]

@mgov1 I patched the PL2303 driver to add support for your device. If you want to test it, you can download it from here: https://github.com/robertklep/dsm7-usb-serial-drivers/raw/main/modules/r1000/dsm-7.1/pl2303-hxn.ko

Perhaps you need to rename it back to pl2303.ko, not sure.

Big fat disclaimer: I'm not able to test this driver, so I can't guarantee it'll work or not crash your system. I would suggest not copying it to /lib/modules until you've tested it out first.

[mgov1]

Thanks @robertklep I’ll verify this evening and let you know.

[mgov1]

Hi @robertklep, I can confirm the driver is working. From dmesg:

_[80723.846360] usb 1-3: new full-speed USB device number 4 using xhcihcd [80724.017909] pl2303 1-3:1.0: pl2303 converter detected [80724.023914] usb 1-3: pl2303 converter now attached to ttyUSB0

$ ls -l /dev | grep -i usb crw------- 1 root root 188, 0 May 17 19:23 ttyUSB0

Many thanks for fixing this!

[robertklep]

Cool! Thanks for testing 👍🏻