linux-kernel - [PATCH v1 3/3] tty: documentation: abi: add ttyvs null modem driver sysfs nodes

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Message-Id: <7d7c949890c4bdb12ecc9f8b15a5c0a69b7604a8.1578235515.git.gupt21@gmail.com>
Date:   Mon,  6 Jan 2020 12:51:55 +0530
From:   Rishi Gupta <gupt21@...il.com>
To:     gregkh@...uxfoundation.org, robh+dt@...nel.org
Cc:     jslaby@...e.com, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rishi Gupta <gupt21@...il.com>
Subject: [PATCH v1 3/3] tty: documentation: abi: add ttyvs null modem driver sysfs nodes

The ttyvs driver exposes sysfs files to emulate various serial
port events. This commit document these files.

Signed-off-by: Rishi Gupta <gupt21@...il.com>
---
 .../ABI/testing/sysfs-devices-virtual-tty_ttyvs        | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-devices-virtual-tty_ttyvs

diff --git a/Documentation/ABI/testing/sysfs-devices-virtual-tty_ttyvs b/Documentation/ABI/testing/sysfs-devices-virtual-tty_ttyvs
new file mode 100644
index 0000000..69b04e0
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-virtual-tty_ttyvs
@@ -0,0 +1,18 @@
+What:		/sys/devices/virtual/tty/ttyvsN/event
+Date:		January 2020
+Contact:	Rishi Gupta <gupt21@...il.com>
+KernelVersion:	5.5
+Description:
+		The ttyvs driver will emulate serial port event; parity error,
+		framing error, overrun error, asserting or de-asserting break
+		conditions and ring indication when user space application
+		writes an event code on this sysfs file.
+
+What:		/sys/devices/virtual/tty/ttyvsN/faultycable
+Date:		January 2020
+Contact:	Rishi Gupta <gupt21@...il.com>
+KernelVersion:	5.5
+Description:
+		The ttyvs driver will emulate as if the cable is faulty; i.e.
+		data sent will not be received when user space application
+		writes 1 on this file. Write 0 to disable this emulation.
-- 
2.7.4