On Thu, Feb 01, 2018 at 11:52:18PM +0530, Ivid Suvarna wrote:

Hi All,

I was going through usb serial driver console related source code (drivers/usb/serial/console.c) in linux kernel and came across "usb_console_write" function and was wondering if any usb serial convertor drivers were using this function? If so any pointers on how it is being used?

Yes, they all can use it. Have you tried?

Also can we implement something like "usb_console_read" which can be useful for interactive debugging like in kgdb. I saw kgdb using something like "poll_get_char and poll_put_char". I found them in most of serial drivers like 8250 and so on.

kgdb needs to run without interrupts enabled, which is impossible for USB normally. There has been external patches to get USB to work for debugging, but that might have only been for simple keyboards.

I am using pl2303 usb to serial convertor for getting a serial console. Is there any way to implement something like usb_console_read in usb serial drivers? Can you guys give me some pointers on this.

It should "just work" today for you. What did you try that was not working properly? thanks, greg k-h