Qualcomm MSM Interface

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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. [1] 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. [2] [3]

Contents

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 proprietary driver which implements within the kernel most of the core protocol logic, while qmi_wwan is part of the upstream kernel and leaves all those tasks to user-space processes, and therefore keeping the kernel driver as small as possible. [1] [4] There are several userspace implementations, such as uqmi on OpenWrt, [5] oFono [6] and libqmi [7]

See also

References

  1. 1 2 Morgado, Aleksander (December 10, 2013). "Qualcomm Gobi devices in Linux based systems" (PDF). Osmocom.org.
  2. ↑ "Qualcomm Linux Modems by Quectel & Co - QMI".
  3. ↑ "QMI". postmarketOS wiki.
  4. ↑ "QMI/Gobi management in the kernel: qmi_wwan or GobiNet?". SIGQUIT. 2014-06-10. Retrieved 2019-12-06.
  5. ↑ "OpenWrt Project: How To use LTE modem in QMI mode for WAN connection". openwrt.org. 3 January 2015. Retrieved 2019-12-06.
  6. ↑ "qmimodem\drivers - ofono/ofono.git - Open Source Telephony". git.kernel.org. Retrieved 2019-12-06.
  7. ↑ "libqmi". www.freedesktop.org. Retrieved 2019-12-06.
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