On Tue, 13 Mar 2018 00:20:32 +0000 Josh Branning <lovell.josh...@gmail.com> wrote:
> Hi, Hi, > looks as if it has support for sending AT commands to a > QMI modem. I'm not sure that AT commands are the best idea to talk to Qualcomm modems. The DIAG interface might be more appropriate. ModemManager might support that interface too probably through libqmi. > Just a quick message to say that if you are not already aware, > ModemManager ModemManager probably uses libqmi to support Qualcomm modems. I think that Woflgang is using libqmi in qmi-ril[1]. So I would guess that he is already aware of hardware support software that uses libqmi. == Using ModemManager or higher level hardware software support ? == I don't know if it makes sense architecturally speaking, to interface ModemManager with the Android RIL interface. However I see many advantages in using GNU/Linux hardware support software[2]. Looking at existing GNU/Linux implementation of the protocol, and being able to reuse as much as possible of the stack is a really good idea. I've started documenting the rationale behind using upstream GNU/Linux software that makes hardware work (instead of upstream Android for that) in the wiki[2]. However, if it's faster to make it work with qmi-ril and libqmi, it might be more strategic to do that now, and maybe consider interfacing higher level GNU/Linux hardware support software to the Android RIL later on. I also don't know the state of the such software in GNU/Linux: I've no idea if ModemManager is the most adapted framework for that. I also don't know which one has the most hardware support and contributions. I also don't know where most of them[3] are in the stack, and the amount of things they do and do not do. Do they take care of audio routing for instance? From the top of my head, the following projects might or might not be involved with modems support in GNU/Linux, at various levels of the stack: - Ofono: Only support(ed?) modems. - Freesmartphone.org (doesn't seem to have much activity anymore): Full stack with modem support, power management(display, input, audio, etc), GPS, etc... - libqmi - ModemManager - NetworkManager - Many other projects that I am probably not aware of. == Testing ModemManager (or other equivalent software) == > Though I am not sure if in practice it can make calls. It > would be nice to test. To test, you could try to port/compile ModemManager to run on Android. If this is not possible, you could try exporting the modem USB to the connector: There might be a chip which can switch between the USB of the processor running Android, its serial port, and some modem interface like USB. If this still doesn't work you could try adding support for the i9305 in upstream Linux: The i9300 is already supported (in arch/arm/boot/dts/exynos4412-trats2.dts) but I didn't check if there is a driver for the modem. References: ----------- [1]git://git.replicant.us/wiewo/qmi-ril [2]https://redmine.replicant.us/projects/replicant/wiki/Upstream [3]I only looked at ofono and Freesmartphone.org. Denis.
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