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@xxxxxxxxx> --- Changes in v3: - Rebased on top of v5.7-rc1 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 e157130..c17b49d 100644 --- a/Documentation/ABI/testing/sysfs-tty +++ b/Documentation/ABI/testing/sysfs-tty @@ -161,3 +161,18 @@ Contact: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Description: Allows user to detach or attach back the given device as kernel console. It shows and accepts a boolean variable. + +What: /sys/class/tty/ttyvsN/event +Date: February 2020 +Contact: Rishi Gupta <gupt21@xxxxxxxxx> +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
