The Qualcomm MSM Interface is a proprietary interface for interacting with Qualcomm baseband processors and is a replacement for the legacy cellular extensions of the Hayes command set. With mobile chipsets, communication between the application processor and the baseband processor happens through shared memory. On PCs with data cards, QMI is exposed through USB.
Linux
In the Linux kernel, QMI can be used through two mutually exclusive drivers: GobiNet and qmi_wwan. These two drivers take completely different approaches to handle the protocol. GobiNet is a complex driver which implements within the kernel most of the core protocol logic, while qmi_wwan leaves all those
tasks to user-space processes, and therefore keeping the kernel driver as small as possible. There are several userspace implementations, such as uqmi on OpenWrt, oFono and libqmi
See also
References
- ^ Morgado, Aleksander (December 10, 2013). "Qualcomm Gobi devices in Linux based systems" (PDF). Osmocom.org.
- "Qualcomm Linux Modems by Quectel & Co - QMI".
- "QMI". postmarketOS wiki.
- "QMI/Gobi management in the kernel: qmi_wwan or GobiNet?". SIGQUIT. 2014-06-10. Retrieved 2019-12-06.
- "OpenWrt Project: How To use LTE modem in QMI mode for WAN connection". openwrt.org. 3 January 2015. Retrieved 2019-12-06.
- "qmimodem\drivers - ofono/ofono.git - Open Source Telephony". git.kernel.org. Retrieved 2019-12-06.
- "libqmi". www.freedesktop.org. Retrieved 2019-12-06.
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