All of lore.kernel.org
 help / color / mirror / Atom feed
From: Oliver Neukum <oneukum-IBi9RG/b67k@public.gmane.org>
To: Stuart Longland
	<stuartl-3e+Fe6x+DsgJbe36r25VNhCuuivNXqWP@public.gmane.org>,
	Johan Hovold <johan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Alan Cox
	<gnomes-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>,
	linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: Moxa UPort 1150 and RS-422/485… what's the "proper" way to switch modes
Date: Tue, 27 Jun 2017 14:08:51 +0200	[thread overview]
Message-ID: <1498565331.30390.5.camel@suse.com> (raw)
In-Reply-To: <42601356-656d-57d0-d366-a0933780b8f9-3e+Fe6x+DsgJbe36r25VNhCuuivNXqWP@public.gmane.org>

Am Dienstag, den 27.06.2017, 19:43 +1000 schrieb Stuart Longland:
> Maybe a good start would be a "standard" option (referring to the
> physical signalling standard, TTL/RS-232/RS-422/RS-485), that lists the
> available standards when read and shows the "selected" standard in
> brackets (like the 'trigger' option of the LEDs sysfs interface)… so for
> this case:
> 
> # cat /sys/class/tty/ttyUSB0/standard
> [rs232] rs422 rs485 rs485fd
> 
> and to select 4-wire ("full duplex") RS-485, one does:
> # echo rs485fd > /sys/class/tty/ttyUSB0/standard

This looks like something that people will put into udev.
So the switch will be done via udev, but the user not necessarily
started via udev. Looks like a race to me.
And what do you if the interface is already opened and the sysfs
interface is used?

	Regards
		Oliver

--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

  parent reply	other threads:[~2017-06-27 12:08 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <4a469222-d48d-f498-f2db-ca582295adc3@longlandclan.id.au>
     [not found] ` <4a469222-d48d-f498-f2db-ca582295adc3-3e+Fe6x+DsgJbe36r25VNhCuuivNXqWP@public.gmane.org>
2017-06-27  9:04   ` Moxa UPort 1150 and RS-422/485… what's the "proper" way to switch modes Johan Hovold
2017-06-27  9:43     ` Stuart Longland
     [not found]       ` <42601356-656d-57d0-d366-a0933780b8f9-3e+Fe6x+DsgJbe36r25VNhCuuivNXqWP@public.gmane.org>
2017-06-27 12:08         ` Oliver Neukum [this message]
     [not found]           ` <1498565331.30390.5.camel-IBi9RG/b67k@public.gmane.org>
2017-06-27 22:07             ` Stuart Longland
     [not found]               ` <ae2907c2-cb0f-61e4-c6f2-af3dcec93ace-3e+Fe6x+DsgJbe36r25VNhCuuivNXqWP@public.gmane.org>
2017-06-28  9:19                 ` Oliver Neukum
     [not found]                   ` <1498641549.10278.5.camel-IBi9RG/b67k@public.gmane.org>
2017-06-28 12:01                     ` Greg KH
     [not found]                       ` <20170628120120.GA10502-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2017-06-28 12:41                         ` Oliver Neukum
     [not found]                           ` <1498653709.10278.17.camel-IBi9RG/b67k@public.gmane.org>
2017-06-28 14:59                             ` Bjørn Mork
2017-06-28 15:35                 ` Johan Hovold
2017-06-28 15:34             ` Johan Hovold
2017-06-29 19:50               ` Alan Cox
2017-07-03  8:51                 ` Johan Hovold
2017-06-28 15:16         ` Johan Hovold
2017-08-18  2:56   ` [PATCH] USB: serial: ti_usb_3410_5052: Port uart_mode from io_ti Stuart Longland
     [not found]     ` <20170818025659.4402-1-stuartl-EoQOJlg3kTYQrrorzV6ljw@public.gmane.org>
2017-08-18  3:16       ` Stuart Longland
2017-08-19 20:40       ` Maksim Salau
     [not found]         ` <20170819234056.37c7d339-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-08-19 20:47           ` Stuart Longland
2017-08-28  8:56       ` Greg KH

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1498565331.30390.5.camel@suse.com \
    --to=oneukum-ibi9rg/b67k@public.gmane.org \
    --cc=gnomes-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org \
    --cc=johan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
    --cc=linux-serial-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=stuartl-3e+Fe6x+DsgJbe36r25VNhCuuivNXqWP@public.gmane.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.