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Old 12-12-2018, 04:58 AM   #1
kdusr
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Question about capture hardware page up(down) button event?

KV and KO2 have two hardware buttons for page up(down),
when user push the buttons, system will trigge some kind event.

I want to capture(receive) those kind hardware button event in my kindle App to do something,
anyone can give me a hint , how to capture the hardware button event? thanks!
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Old 12-12-2018, 01:29 PM   #2
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try to grep in the dmesg the "page" word
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Old 12-13-2018, 10:56 AM   #3
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Quote:
Originally Posted by encol View Post
try to grep in the dmesg the "page" word
click the page up down button serveal times , and run dmesg | tail -20 find the button event name, it is called :
gpio_keys_gpio_report_event: type=1, code=109,state=1 (page down button)
gpio_keys_gpio_report_event: type=1, code=104,state=1 (page up button)

but how to monitor those event in shell or python?

Last edited by kdusr; 12-14-2018 at 10:56 AM.
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Old 12-13-2018, 11:32 AM   #4
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DBUS?
https://www.freedesktop.org/wiki/Software/dbus/

The Kindle system has a higher level abstraction built on top of DBUS.
It is rare that DBUS is used directly in the Kindles.
Although it has been present in all models since, at least, the K2 (I don't have a K1 to check).

Last edited by knc1; 12-13-2018 at 11:38 AM.
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Old 12-13-2018, 01:58 PM   #5
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There's a wait-for-key (or something to that effect) binary somewhere, IIRC.

Other than that, read Linux's documentation on its input stack, I don't think the framework holds an exclusive grab on the input devices.

The KV may be a special snowflake on that front, we know it magically inhibits hardware button events in some circumstances.
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Old 12-13-2018, 03:10 PM   #6
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Quote:
Originally Posted by kdusr View Post
click the page up down button serveal times , and run dmesg | tail -20 find the button event name, it is called :
gpio_keys_gpio_report_event: type=1, code=109,state=1 (page down button)
gpio_keys_gpio_report_event: type=1, code=109,state=1 (page up button)

but how to monitor those event in shell or python?
I think you should read this thread
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