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From: Rishi Gupta <gupt21@gmail.com>
To: gregkh@linuxfoundation.org, robh+dt@kernel.org
Cc: jslaby@suse.com, linux-serial@vger.kernel.org,
	linux-kernel@vger.kernel.org, Rishi Gupta <gupt21@gmail.com>
Subject: [PATCH v2 3/4] tty: documentation: abi: add ttyvs null modem driver sysfs nodes
Date: Sat, 15 Feb 2020 23:21:08 +0530	[thread overview]
Message-ID: <1581789069-5232-3-git-send-email-gupt21@gmail.com> (raw)
In-Reply-To: <1581789069-5232-1-git-send-email-gupt21@gmail.com>

The ttyvs driver exposes sysfs file called event to emulate
various serial port events. This commit document this file.
User space application writes various codes to this file.

Signed-off-by: Rishi Gupta <gupt21@gmail.com>
---
Changes in v2:
- Updated path to /sys/class/tty/ttyvsN/event
- Used Documentation/ABI/testing/sysfs-tty, previously new file was created

 Documentation/ABI/testing/sysfs-tty | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-tty b/Documentation/ABI/testing/sysfs-tty
index 9eb3c2b..c6002c5 100644
--- a/Documentation/ABI/testing/sysfs-tty
+++ b/Documentation/ABI/testing/sysfs-tty
@@ -154,3 +154,18 @@ Description:
 		 device specification. For example, when user sets 7bytes on
 		 16550A, which has 1/4/8/14 bytes trigger, the RX trigger is
 		 automatically changed to 4 bytes.
+
+What:		/sys/class/tty/ttyvsN/event
+Date:		February 2020
+Contact:	Rishi Gupta <gupt21@gmail.com>
+Description:
+		The ttyvs driver will emulate serial port event; parity error,
+		framing error, overrun error, asserting/de-asserting break
+		condition and ring indication when user space application
+		writes an event code on this sysfs file.
+
+		Write 1 to emulate framing error, write 2 for parity error,
+		write 3 for overrun error, write 4 to set ring indication,
+		write 5 to clear ring indication, write 6 to emulate a break
+		condition detected, write 7 to emulate a faulty cable and
+		write 8 to remove faulty cable condition.
-- 
2.7.4


  parent reply	other threads:[~2020-02-15 17:51 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-15 17:51 [PATCH v2 1/4] dt-bindings: ttyvs: document serial null modem driver bindings Rishi Gupta
2020-02-15 17:51 ` [PATCH v2 2/4] tty/serial: ttvys: add null modem driver for emulation Rishi Gupta
2020-04-08 16:16   ` rishi gupta
2020-04-13  9:23     ` Andy Shevchenko
2020-02-15 17:51 ` Rishi Gupta [this message]
2020-02-15 17:51 ` [PATCH v2 4/4] tty: documentation: document how to use ttyvs driver Rishi Gupta

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