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    • Hans Verkuil's avatar
      Input: serio - add hangup support · 51db0137
      Hans Verkuil authored
      The Pulse-Eight USB CEC adapter is a usb device that shows up as a ttyACM0
      device.  It requires that you run inputattach in order to communicate with
      it via serio.
      
      This all works well, but it would be nice to have a udev rule to
      automatically start inputattach. That too works OK, but the problem comes
      when the USB device is unplugged: the tty hangup is never handled by the
      serio framework so the inputattach utility never exits and you have to kill
      it manually.
      
      By adding this hangup callback the inputattach utility now properly exits
      as soon as the USB device is unplugged.
      
      The udev rule I used on my Debian sid system is:
      
      SUBSYSTEM=="tty", KERNEL=="ttyACM[0-9]*", ATTRS{idVendor}=="2548", ATTRS{idProduct}=="1002", ACTION=="add", TAG+="systemd", ENV{SYSTEMD_WANTS}+="pulse8-cec-inputattach@%k.service"
      
      And /etc/systemd/system/pulse8-cec-inputattach@.service is as follows:
      
      ===============================================================
      [Unit]
      Description=inputattach for pulse8-cec device on %I
      
      [Service]
      Type=simple
      ExecStart=/usr/local/bin/inputattach --pulse8-cec /dev/%I
      KillMode=process
      ===============================================================
      Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
      Tested-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
      Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
      51db0137
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