On Thu, Mar 11, 2021 at 05:39:05PM +0100, Loic Poulain wrote: > This change introduces initial support for a WWAN subsystem. Given the > complexity and heterogeneity of existing WWAN hardwares and interfaces, > there is no strict definition of what a WWAN device is and how it should > be represented. It's often a collection of multiple components/devices > that perform the global WWAN feature (netdev, tty, chardev, etc). > > One usual way to expose modem controls and configuration is via high > level protocols such as the well known AT command protocol, MBIM or > QMI. The USB modems started to expose that as character devices, and > user daemons such as ModemManager learnt how to deal with that. This > initial version adds the concept of WWAN port, which can be registered > by any driver to expose one of these protocols. The WWAN core takes > care of the generic part, including character device creation and lets > the driver implementing access (fops) to the selected protocol. > > Since the different components/devices do no necesserarly know about > each others, and can be created/removed in different orders, the > WWAN core ensures that devices being part of the same hardware are > also represented as a unique WWAN device, relying on the provided > parent device (e.g. mhi controller, USB device). It's a 'trick' I > copied from Johannes's earlier WWAN subsystem proposal. > > This initial version is purposely minimalist, it's essentially moving > the generic part of the previously proposed mhi_wwan_ctrl driver inside > a common WWAN framework, but the implementation is open and flexible > enough to allow extension for further drivers. > > Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxx> > --- > drivers/net/Kconfig | 2 + > drivers/net/Makefile | 1 + > drivers/net/wwan/Kconfig | 19 ++++++ > drivers/net/wwan/Makefile | 8 +++ > drivers/net/wwan/wwan_core.c | 150 +++++++++++++++++++++++++++++++++++++++++++ > drivers/net/wwan/wwan_core.h | 20 ++++++ > drivers/net/wwan/wwan_port.c | 136 +++++++++++++++++++++++++++++++++++++++ > include/linux/wwan.h | 121 ++++++++++++++++++++++++++++++++++ > 8 files changed, 457 insertions(+) > create mode 100644 drivers/net/wwan/Kconfig > create mode 100644 drivers/net/wwan/Makefile > create mode 100644 drivers/net/wwan/wwan_core.c > create mode 100644 drivers/net/wwan/wwan_core.h > create mode 100644 drivers/net/wwan/wwan_port.c > create mode 100644 include/linux/wwan.h What changed from the last version(s)? That should be below the --- somewhere, right? v5? thanks, greg k-h
