USB serial driver for USB to UART chip ch340, ch341, etc. ch341 supports multiple working modes, this driver only supports its serial port mode.
In fact the ch341 serial driver has been built-in since the Linux mainline kernel version 2.6.24. The location is: drivers/usb/serial/ch341.c, it's a pity that the built-in driver cannot be kept up to date and cannot support all features of the chip. We suggest our customers to use this driver.
Before the driver works, you should make sure that the usb device has been plugged in and is working properly, you can use shell command "lsusb" or "dmesg" to confirm that, USB VID of these devices are [1a86], you can view all IDs from the id table which defined in "ch341.c".
If the device works well, the driver will created tty devices named "ttyCH341USBx" in /dev directory.
Any question, you can send feedback to mail: tech@wch.cn