The following patch set adds the possibility to change the tty trigger
modes. Until now, the LED is flashed when data is transmitted. With a
legacy serial interface there are additional signal lines.
If this line changes then the LED is turned on/off.

CTS: Clear To Send       -> DCE is ready to accept data from the DTE
DSR: Data Set Ready      -> DCE is ready to receive and send data.
CAR: Data Carrier Detect -> DCE is receiving a carrier from a remote DCE.
RNG: Ring Indicator      -> DCE has detected an incoming ring on the line.

Florian Eckert (2):
  tty: new helper function tty_get_mget
  leds: trigger: ledtrig-tty: add additional modes

 .../ABI/testing/sysfs-class-led-trigger-tty   |  16 ++
 drivers/leds/trigger/ledtrig-tty.c            | 148 ++++++++++++++++--
 drivers/tty/tty_io.c                          |  32 +++-
 include/linux/tty.h                           |   3 +-
 4 files changed, 176 insertions(+), 23 deletions(-)

-- 
2.30.2