[PATCH net-next v3 0/2] Improve wwan qcdm compatibility with user-space tools

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
V3: simplified patch 2 according to Loic's comment at
https://lore.kernel.org/netdev/CAFEp6-2UiSja11A6nLKqRX8A1eE=P4euEs+fbpKZxPE8fTX2QQ@mail.gmail.com/#t (local)

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 | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

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2.43.0