Hi Maksim, On 20/08/17 06:40, Maksim Salau wrote: >> This introduces the `uart_mode` sysfs attribute as seen in the `io_ti` >> USB serial driver, allowing this USB serial interface to be switched >> between RS-232, 2-wire RS-485 and 4-wire RS-485. > > Recently I've discovered a blog post by Greg Kroah-Hartman on sysfs files [1]. > I believe this information will help you to create the new file in a better way. > > [1] http://kroah.com/log/blog/2013/06/26/how-to-create-a-sysfs-file-correctly/ I'll definitely look into that… however I think the long-term plan in this case is to expand the RS-485 IOCTL once some research is done into what settings it should include. I personally would like to see a sysfs interface in addition to enable the possibility of udev rules configuring a port prior to its use, however others have indicated that may result in a race condition. A dual-interface (ioctl + sysfs) would give us the best of both worlds, and that link sounds like an ideal way of doing the sysfs part. -- Stuart Longland Systems Engineer _ ___ \ /|_) | T: +61 7 3535 9619 \/ | \ | 38b Douglas Street F: +61 7 3535 9699 SYSTEMS Milton QLD 4064 http://www.vrt.com.au -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
