Aleksander Morgado
8fc60754dd
This plugin implements support for old Qualcomm SoCs like the MSM8916 or the MSM8974, where: * control ports are available via RPMSG channels exported as devices e.g. with rpmsgexport: https://github.com/andersson/rpmsgexport * network ports are exposed by the bam-dmux kernel driver: https://github.com/msm8916-mainline/linux/commits/bam-dmux Adding support for newer Qualcomm SoCs (e.g. QRTR+IPA) could be done in a similar way on this very same plugin. This plugin is the first and only one that implements support for a modem device that is "built in" the system, as opposed to external modems that may be available via USB or PCI. The ID_MM_PHYSDEV_UID based udev tags provided by the plugin provide the logic to bind all the SoC ports together in the same modem object, and therefore ID_MM_PHYSDEV_UID should not be used by users to override the ones set by the plugin. All "rpmsg[0-9]*" ports that are considered part of the modem are flagged as candidate, ignoring the parent "rpmsg_ctrl[0-9]*" ports on purpose. This setup therefore assumes that the channels have been exported already as devices (e.g. using rpmsgexport). libqmi 1.27.2 is required to support the "WDS Bind Data Port" message.
ModemManager. ModemManager provides a unified high level API for communicating with mobile broadband modems, regardless of the protocol used to communicate with the actual device (Generic AT, vendor-specific AT, QCDM, QMI, MBIM...). Using. ModemManager is a system daemon and is not meant to be used directly from the command line. However, since it provides a DBus API, it is possible to use 'dbus-send' commands or the new 'mmcli' command line interface to control it from the terminal. The devices are queried from udev and automatically updated based on hardware events, although a manual re-scan can also be requested to look for RS232 modems. Implementation. ModemManager is a DBus system bus activated service (meaning it's started automatically when a request arrives). It is written in C, using glib and gio. Several GInterfaces specify different features that the modems support, including the generic MMIfaceModem3gpp and MMIfaceModemCdma which provide basic operations for 3GPP (GSM, UMTS, LTE) or CDMA (CDMA1x, EV-DO) modems. If a given feature is not available in the modem, the specific interface will not be exported in DBus. Plugins. Plugins are loaded on startup, and must implement the MMPlugin interface. It consists of a couple of methods which tell the daemon whether the plugin supports a port and to create custom MMBroadbandModem implementations. It most likely makes sense to derive custom modem implementations from one of the generic classes and just add (or override) operations which are not standard. There are multiple fully working plugins in the plugins/ directory that can be used as an example for writing new plugins. Writing new plugins is highly encouraged! The plugin API is open for changes, so if you're writing a plugin and need to add or change some public method, feel free to suggest it! License. The ModemManager and mmcli binaries are both GPLv2+. The libmm-glib library is LGPLv2+.