May 2009 - e3-hacking

Please help creating gpio-switch on ams-delta
by Janusz Krzysztofik 14 May '09

14 May '09

Hi, I am playing with OMAP 5910 based Amstrad E3 videophone (ams-delta) machine. I am trying to expose GPIO 4, that hook switch hangs off, to userspace. I can successfully access the pin by exporting it using gpiolib sysfs. I can check its value, following hook switch state changes. However, I would like the switch to generate events. I have tried two methods: gpio-switch and gpio-keys. gpio-switch device is able to report the switch initial state correctly, gpio-keys device just initializes without errors. However, for both methods, after first switch change, the system stops responding, giving no error messages. The code of goip-switch initialization sequence together with my platform device definition (attached) does not look any different to me than those for keyboard or modem (patches available from http://the.earth.li/pub/e3/2.6.19/) that both also use GPIO interrupts and do work for me. Any hints? Janusz PS. This is my first post to linux-omap list, I don't know if you accept attachments. If not, next time I switch to a different mail user agent that allows me for inline file inclusion (or learn how to do it in my thunderbird).

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Any more chances for E3 working as IP phone?
by Janusz Krzysztofik 13 May '09

13 May '09

Hi, Greetings from new list member. I have bought E3 recently in hope I could use it as IP phone, or even POTS phone with extra newtworking features. I alread have asterisk running on it, controled from keypad via lirc, with led provided visual feedback. Two parts are missing: working sound driver for handset/speakerphone and input driver for hook switch. It looks like most develompents have ceased about 2 years ago, but I have some questions if you are still there. Question to Mark Underwood: Are you still working on E3 sound driver? If not, what blockers can you see? Maybe I could help. Questions to Jonathan McDowell, maybe others: 1. Did you succeed in talking to the handset over the modem chip in full duplex? 2. Did you try to create a driver for hook switch hanging off GPIO input 4, as Matt Callow detected it once? If not, what hints could you give me for creating one? 3. As googling did not give me any answer, where can I find any info on Q;Q; block format? Question to Martin Whitaker: Have you successfully setup your device for making voice calls with handset over the modem using AT commands? More questions: 1. Has anyone managed to boot a kernel built from Amstrad provided sources (linux-2.4.18-mv30-E3.tar.bz2)? 2. What is the format of a copy of the kernel taken from the device (kernel2.4.18_mvl30-ams-delta)? Has anyone managed to boot it with u-boot or other open source loader? 3. Has anyone managed to make any use of flash image backups, for example, for examining filesystem contents? Thanks, Janusz

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Re: [E3-hacking] Any more chances for E3 working as IP phone?
by Janusz Krzysztofik 07 May '09

07 May '09

Hi, As Martin Whitaker has answered my question off-list, I am replying to myself quoting him, with his permission. Martin Whitaker wrote: > Yes, I have managed to make normal POTS phone calls, using the handset, > using AT commands. Hi Martin, It's good to hear that I still have a chance to use my E3 as a plain phone if not IP. What about accepting calls, were you able to make your E3 ringing on someone calling you over the modem? Was it possible without a working sound driver? > I even got as far as writing a simple phone application, > however it wasn't especially useful as it depended upon a frame buffer based > graphics library that wasn't directfb I took a different approach, trying to use existing building blocks, like asterisk, lirc, etc., coupled with custom scripts. If it ever turns out to slow, I can look for a more efficient solution then. Anyway, any ideas you have put into your application could be usefull. > and also depended upon a kernel mod > I'd done which made the on/off hook button send a keystroke (this was > trivial btw - I'll see if I can make a patch for that too). That would be great. I have already managed to detect hook state without any coding, using sysfs interface of the 2.6.27 gpio driver, but this does not generate any events so is only suitable for polling. Maybe the simplest way to get input events now a days would be to use gpio-keys driver over an ams-delta specific platform device with setup logic and configuration data saying which GPIO is used. > I'm happy to share the source (if I can find it again), however it may be a > few days before I'm in a position to look for it. That's fine, I can investigate other work needing areas in the mean time. > I haven't touched the E3 in years now, although I'd like to play with it > again. I'd quite like to get it up to the latest kernel version, Yes, if we think of further development, porting existing patches to the latest kernel version is essential. For now, I have tried 2.6.27, the latest one with omap patch available on www.muru.com. I have managed to port 2.6.19 ams-delta-keyboard.patch (tested - works for me) and ams-delta-modem.patch (builds, loads, responds to AT commands, needs more testing). Next step would be to go for latest versions available from git repositories, that is still some kind of magic for me how to merge it into openembedded, but I could try. I am going to post modified patches here, but am not sure how to include them - inline or as attachments. Regards, Janusz

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