Clara HD Turn Clara into Kiosk Mode

mafi · 07-02-2019, 06:09 PM

Hi, i want to disable the touch functionality of my Clara. The idea is to create a solution/app and run it in Kiosk mode.

I was successful with the weather forecast app (yawk) and are now able to build my own python applications.

Any (dirty

) suggestions are welcome!

Best Regards,
Martin

NiLuJe · 07-02-2019, 06:13 PM

Since you mentioned dirty... I imagine patching Nickel so it grabs a bogus input device *could* work? (It depends on how gracefully it would handle that unexpected behavior).

But then that's an all-or-nothing approach, which might not be practical.

mafi · 07-02-2019, 06:29 PM

Okay and how? Is there a Nickel "config file"

NiLuJe · 07-02-2019, 07:33 PM

Nope, binary patching

.

Speaking of, a slightly less permanent approach could be to just patch out the EVIOCGRAB, and do that on your end, since I assume if you grab it, Nickel then gets the shaft (easy enough to double-check with two different evtest instances, the first one not grabbing, while the second one does. That does require Nickel to be down, since it currently does grab ;p).

I think @frostschutz has some experience with that, IIRC.

----

Otherwise, you could simply bypass Nickel, and boot into a custom app where you handle input as you see fit

.

frostschutz · 07-02-2019, 07:34 PM

you can grab the touchscreen, my flashcard addon does it (runs an app with seamless transition, read book, study flashcard, read book, study ...)

if you want to kill the touchscreen entire I guess you could unbind the driver too but that's a one-way road

or you can just kill nickel altogether...? or replace the init (process 1) for a complete takeover [my MagicMemory addon kinda does that]

NiLuJe · 07-02-2019, 07:36 PM

Speaking of killing, I also do not remember what happens if you simply SIGSTOP it...

frostschutz · 07-02-2019, 07:40 PM

I stop it as well (I think sickel along with it, I think there was a reboot problem at some point)

In general it works well but since you're shooting blindly it can be stopped in unopportune times (device was just about to standby, or wakeup, or go into usb mode, and bam - stopped).

but still fine, can't have everything ;-)

07-02-2019, 06:09 PM	#1
mafi Junior Member Posts: 4 Karma: 10 Join Date: Jun 2019 Location: Austria, Villach Device: Kobo	Turn Clara into Kiosk Mode Hi, i want to disable the touch functionality of my Clara. The idea is to create a solution/app and run it in Kiosk mode. I was successful with the weather forecast app (yawk) and are now able to build my own python applications. Any (dirty ) suggestions are welcome! Best Regards, Martin

07-02-2019, 07:34 PM	#5
frostschutz Linux User Posts: 2,281 Karma: 6123806 Join Date: Sep 2010 Location: Heidelberg, Germany Device: none	you can grab the touchscreen, my flashcard addon does it (runs an app with seamless transition, read book, study flashcard, read book, study ...) if you want to kill the touchscreen entire I guess you could unbind the driver too but that's a one-way road or you can just kill nickel altogether...? or replace the init (process 1) for a complete takeover [my MagicMemory addon kinda does that] Last edited by frostschutz; 07-02-2019 at 07:37 PM.

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07-02-2019, 06:13 PM	#2
NiLuJe BLAM! Posts: 13,501 Karma: 26047188 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	Since you mentioned dirty... I imagine patching Nickel so it grabs a bogus input device could work? (It depends on how gracefully it would handle that unexpected behavior). But then that's an all-or-nothing approach, which might not be practical.

07-02-2019, 06:29 PM	#3
mafi Junior Member Posts: 4 Karma: 10 Join Date: Jun 2019 Location: Austria, Villach Device: Kobo	Okay and how? Is there a Nickel "config file"

07-02-2019, 07:33 PM	#4
NiLuJe BLAM! Posts: 13,501 Karma: 26047188 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	Nope, binary patching . Speaking of, a slightly less permanent approach could be to just patch out the EVIOCGRAB, and do that on your end, since I assume if you grab it, Nickel then gets the shaft (easy enough to double-check with two different evtest instances, the first one not grabbing, while the second one does. That does require Nickel to be down, since it currently does grab ;p). I think @frostschutz has some experience with that, IIRC. ---- Otherwise, you could simply bypass Nickel, and boot into a custom app where you handle input as you see fit .

07-02-2019, 07:36 PM	#6
NiLuJe BLAM! Posts: 13,501 Karma: 26047188 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	Speaking of killing, I also do not remember what happens if you simply SIGSTOP it...

07-02-2019, 07:40 PM	#7
frostschutz Linux User Posts: 2,281 Karma: 6123806 Join Date: Sep 2010 Location: Heidelberg, Germany Device: none	I stop it as well (I think sickel along with it, I think there was a reboot problem at some point) In general it works well but since you're shooting blindly it can be stopped in unopportune times (device was just about to standby, or wakeup, or go into usb mode, and bam - stopped). but still fine, can't have everything ;-)

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