Historically, Qualcomm diagnostic port was a serial device, so user-space
tools were developed using tty specific features. One of the most common
tool is, for example, ModemManager libqcdm, available at
https://gitlab.freedesktop.org/mobile-broadband/ModemManager
which requires tcgetattr/tcsetattr and the possibility to get exclusive
device access to properly work.

The wwan qcdm is not really a tty device, but, besides the lack of tty
functions, it behaves as a standard serial Qualcomm diagnostic port, so,
as c230035c2f2f ("net: wwan: core: implement terminal ioctls for AT port"),
this series add support for terminal ioctls also for qcdm ports and
implement the exclusive open mode feature to improve compatibility with
user-space tools.

This is an incremental change which should not affect the existing tools
using wwan which do not rely on the implemented features.

V2: fixed race condition highlighted by Sashiko at
https://sashiko.dev/#/patchset/20260717081935.2071083-1-dnlplm%40gmail.com

Daniele Palmas (2):
  net: wwan: add minimalistic IOCTls support also to QCDM port
  net: wwan: add exclusive open mode capability to AT and QCDM ports

 drivers/net/wwan/wwan_core.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

-- 
2.43.0