linux-kernel - Re: WIP Droid 4 voice calls, GNSS & PM with a TS 27.010 serdev driver

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Date:   Sun, 23 Dec 2018 11:33:15 +0100
From:   Pavel Machek <pavel@....cz>
To:     Tony Lindgren <tony@...mide.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-omap@...r.kernel.org,
        Jarkko Nikula <jarkko.nikula@...mer.com>,
        Johan Hovold <johan@...nel.org>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Marcel Partap <mpartap@....net>,
        Merlijn Wajer <merlijn@...zup.org>,
        Michael Scott <hashcode0f@...il.com>,
        NeKit <nekit1000@...il.com>, omerlle@...il.com,
        Sebastian Reichel <sre@...nel.org>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Rob Herring <robh@...nel.org>
Subject: Re: WIP Droid 4 voice calls, GNSS & PM with a TS 27.010 serdev driver

Hi!

> So the little elves have been slowly working to get voice calls
> working on droid 4 with the mainline kernel. And just in time for the
> upcoming holidays, it might be possible to call friends and relatives.
> 
> I've pushed out an experimental branch containing serdev ts 27.010
> UART multiplexing support. That contains a serdev core driver for the
> mdm6600 modem (that also now idles the modem for PM), support for Alsa
> ASoC voice codec and mixer, and a GNSS driver for the GPS.
> 
> Where it does not make sense to do a kernel serdev driver, I've
> exposed the rest of the available 27.010 channels as ten /dev/motmdm*
> character devices. There's /dev/motmdm1 for AT commands to dial voice
> calls, /dev/motmdm3 for SMS eventually, and I think there's also a SIM
> card reader at /dev/motmdm10. Then /dev/motmdm7 seems to be just an
> echo channel. The other channels are still a bit of a mystery.

I suspected it does not work in non-modular case, so I tried with
modules:

root@...uan:/my/ko# insmod gnss.ko
root@...uan:/my/ko# insmod gnss-motmdm.ko
insmod: ERROR: could not insert module gnss-motmdm.ko: Unknown symbol
in module
root@...uan:/my/ko# insmod n_gsm.ko
root@...uan:/my/ko# insmod snd-soc-motmdm.ko
insmod: ERROR: could not insert module snd-soc-motmdm.ko: Unknown
symbol in module
root@...uan:/my/ko# insmod motorola-mdm.ko
root@...uan:/my/ko# insmod snd-soc-motmdm.ko
root@...uan:/my/ko# insmod gnss-motmdm.ko
root@...uan:/my/ko#

But...

root@...uan:/my/ko# ls -al /dev/motmdm*
ls: cannot access '/dev/motmdm*': No such file or directory
root@...uan:/my/ko# ls -al /dev/gnss*
ls: cannot access '/dev/gnss*': No such file or directory
root@...uan:/my/ko#
[  116.244445] gnss: GNSS driver registered with major 242
[  119.892547] gnss_motmdm: Unknown symbol motmdm_register_dlci (err
-2)
[  119.899444] gnss_motmdm: Unknown symbol motmdm_unregister_dlci (err
-2)
[  129.145935] snd_soc_motmdm: Unknown symbol motmdm_register_dlci
(err -2)
[  129.153106] snd_soc_motmdm: Unknown symbol motmdm_unregister_dlci
(err -2)
[  131.120361] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host
[  161.190216] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host
[  191.270263] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host
[  221.360107] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host
[  251.429962] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host
[  281.509643] cpcap-usb-phy cpcap-usb-phy.0: connected to USB host
[  292.816436] g_ether gadget: packet filter 0e
[  292.825256] g_ether gadget: ecm req21.43 v000e i0000 l0

...do I need to make devices manually or some udev rules?

user@...uan:~$ cat /proc/devices | grep motmdm
user@...uan:~$ cat /proc/devices | grep gnss
242 gnss
user@...uan:~$

Hmm, I suspect the driver just did not recognize the hw.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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