QinHeng Electronics HL-340 USB-Serial adapter

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1527491

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

2012 ubuntuforum, same device, worked and then stopped after a upgrade.
http://ubuntuforums.org/archive/index.php/t-1923883.html

CentOS reference to serial problems with same device.
https://www.centos.org/forums/viewtopic.php?t=7369

apport information

apport information

Also affects 14.04 LTS with 3.19 kernel

OS: Linux 4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
fresh install.

modinfo i2c-ch341
filename: /lib/modules/4.4.0-31-generic/kernel/drivers/i2c/i2c-ch341.ko
license: GPL
description: i2c-ch341-u2c driver
author: Marco Gittler <email address hidden>
srcversion: 793AECF7CF0745E30FD20F9
alias: usb:v1A86p5512d*dc*dsc*dp*ic*isc*ip*in*
depends:
vermagic: 4.4.0-31-generic SMP mod_unload modversions
parm: frequency:I2C clock frequency in hertz (uint)

I try to run Arduino Nano with ch341, but nothing work. Something between USB2.0 or USB3.0 ? or kernel compilation anyways ?
And if so, why on old kernel 3.18 work it snoothly ?

Also dont work a guide:
http://blog.xentoo.info/2015/12/31/ubuntu-14-04-and-usb-to-serial-ch341-chinese-device-from-ebay/

dmesg
[ 1431.007315] usbcore: registered new interface driver usbserial
[ 1431.007323] usbcore: registered new interface driver usbserial_generic
[ 1431.007330] usbserial: USB Serial support registered for generic
[ 1431.008619] usbcore: registered new interface driver ch341
[ 1431.008629] usbserial: USB Serial support registered for ch341-uart

- its very nice that Serial support is registered, but not attached for example: to the BUS 003 Device 001: ID 1A86:.... (and this is important)

ls /dev/tty*
/dev/tty /dev/ttyS22 /dev/tty0 /dev/tty24 /dev/tty4 /dev/tty55
/dev/ttyprintk /dev/ttyS23 /dev/tty1 /dev/tty25 /dev/tty40 /dev/tty56
/dev/ttyS0 /dev/ttyS24 /dev/tty10 /dev/tty26 /dev/tty41 /dev/tty57
/dev/ttyS1 /dev/ttyS25 /dev/tty11 /dev/tty27 /dev/tty42 /dev/tty58
.....and so on. but nothing with ttyUSB0, ttyUSB1, or ttyACM0, ttyACM1.

Please Is here some competent person to FIX this ISUE ?

Thank you

I have these adapters

 /* expect two bytes 0x56 0x00 */
 r = ch341_control_in(dev, 0x95, 0x2518, 0, buffer, size);
 if (r < 0)
  goto out;
/*Comment this line out and recompile*/ //r = ch341_control_out(dev, 0x9a, 0x2518, 0x0050);
 if (r < 0)
  goto out;

Everything works now

Thank you wlarsong! Work nice!

Hello, same problem to me. Wlarsong, how to fix step by step?

You can rebuild the kernel by following these steps

https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel

the file you will need to edit is here

drivers/usb/serial/ch341.c

&&

http://lxr.free-electrons.com/source/drivers/usb/serial/ch341.c

I'm sure you can recompile things by module but from memory the process is lengthy and difficult. This is the easiest option -- although re-compiling the kernel will take a while. Hopefully a patch will come soon.

26 Jan 2017; same problem

from syslog

Jan 26 08:36:17 USSMLTRDLinux02 kernel: [259338.868105] usb 2-1.1: new full-speed USB device number 38 using ehci-pci
Jan 26 08:36:17 USSMLTRDLinux02 kernel: [259338.961091] usb 2-1.1: New USB device found, idVendor=1a86, idProduct=7523
Jan 26 08:36:17 USSMLTRDLinux02 kernel: [259338.961097] usb 2-1.1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
Jan 26 08:36:17 USSMLTRDLinux02 kernel: [259338.961099] usb 2-1.1: Product: USB2.0-Ser!
Jan 26 08:36:17 USSMLTRDLinux02 kernel: [259338.961389] ch341 2-1.1:1.0: ch341-uart converter detected
Jan 26 08:36:17 USSMLTRDLinux02 kernel: [259338.963275] usb 2-1.1: ch341-uart converter now attached to ttyUSB1
Jan 26 08:36:17 USSMLTRDLinux02 mtp-probe: checking bus 2, device 38: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.1"
Jan 26 08:36:17 USSMLTRDLinux02 mtp-probe: bus: 2, device: 38 was not an MTP device

$ uname -a
Linux USSMLTRDLinux02 3.13.0-107-generic #154~precise1-Ubuntu SMP Tue Dec 20 10:37:27 UTC 2016 i686 i686 i386 GNU/Linux

I do observe the associated access is ehci-pci, whereas the original post access was xhci_hcd

Also I have some CH341 bases RS485 interfaces, they work just fine, same VID:PID. The device having problems is RS232. These have a driver CD for Windows, works fine there.

sys;log for the RS485 device

Jan 26 08:48:04 USSMLTRDLinux02 kernel: [260046.435291] usb 2-1.4: USB disconnect, device number 37
Jan 26 08:48:07 USSMLTRDLinux02 kernel: [260049.195120] usb 2-1.4: new full-speed USB device number 39 using ehci-pci
Jan 26 08:48:07 USSMLTRDLinux02 kernel: [260049.288782] usb 2-1.4: New USB device found, idVendor=1a86, idProduct=7523
Jan 26 08:48:07 USSMLTRDLinux02 kernel: [260049.288788] usb 2-1.4: New USB device strings: Mfr=0, Product=2, SerialNumber=0
Jan 26 08:48:07 USSMLTRDLinux02 kernel: [260049.288791] usb 2-1.4: Product: USB2.0-Serial
Jan 26 08:48:07 USSMLTRDLinux02 kernel: [260049.289149] ch341 2-1.4:1.0: ch341-uart converter detected
Jan 26 08:48:07 USSMLTRDLinux02 kernel: [260049.291092] usb 2-1.4: ch341-uart converter now attached to ttyUSB2
Jan 26 08:48:07 USSMLTRDLinux02 mtp-probe: checking bus 2, device 39: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4"
Jan 26 08:48:07 USSMLTRDLinux02 mtp-probe: bus: 2, device: 39 was not an MTP device

I note in RS232 description:
Jan 26 08:36:17 USSMLTRDLinux02 kernel: [259338.961099] usb 2-1.1: Product: USB2.0-Ser!

and in RS485 description:
Jan 26 08:48:07 USSMLTRDLinux02 kernel: [260049.288791] usb 2-1.4: Product: USB2.0-Serial

interesting how the description in syslog also corrupts

Module ch341 still defect on kernel 4.9 .
In my case, the correction proposed in #9 works (thanks to the author).

Tips: How to build module without the entire kernel
# cd drivers/usb/serial
# make -C /lib/modules/$(uname -r)/build M=$(pwd) modules

Try the latest mainline kernel? This commit [1] seems to address the issue.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/usb/serial/ch341.c?id=7c61b0d5e82bfe29b8dda55745afbf65b6ccc901

I found a new ch341.c source code.

<https://github.com/torvalds/linux/blob/master/drivers/usb/serial/ch341.c>

and I wanted to build a module ch341.ko on ubuntu16.04(Japanese) that
kenerl-4.4.0-81-generic, but could not build. I think that ch341.c
was changed interface to upper module. ch341.c in github is about 640 lines.
so I search kernel in The Linux Kernel Archives that ch341.c has same size.
then I found kernel-4.11.6(but now 4.11.7).

I build kernel-4.11.6 on ubuntu16.04, I build kernel-image, but could not
build kernel-headers. I install kernel-image to use dpkg command. and I
use minicom to communicate HL-340, and work fine.

also I build kernel-4.11.6 on slackware64-14.2, HL-340 also work fine.