* what is the meaning of matrix_keypad_platform_data.active_low
@ 2009-08-25 7:18 Xiangfu Liu
2009-08-25 10:21 ` Marek Vasut
0 siblings, 1 reply; 2+ messages in thread
From: Xiangfu Liu @ 2009-08-25 7:18 UTC (permalink / raw)
To: linux-kernel; +Cc: linux-input
Hi
./include/linux/input/matrix_keypad.h
there no help in matrix_keypad.h about active_low.
I guess. when set active_low to 1.means:
0: key press
1: key not press
right?
thanks for help.
--
Xiangfu Liu
Email: xiangfu at qi-hardware dot com
Web: http://www.qi-hardware.com
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: what is the meaning of matrix_keypad_platform_data.active_low
2009-08-25 7:18 what is the meaning of matrix_keypad_platform_data.active_low Xiangfu Liu
@ 2009-08-25 10:21 ` Marek Vasut
0 siblings, 0 replies; 2+ messages in thread
From: Marek Vasut @ 2009-08-25 10:21 UTC (permalink / raw)
To: Xiangfu Liu; +Cc: linux-kernel, linux-input
Dne Út 25. srpna 2009 09:18:23 Xiangfu Liu napsal(a):
> Hi
> ./include/linux/input/matrix_keypad.h
> there no help in matrix_keypad.h about active_low.
>
> I guess. when set active_low to 1.means:
>
> 0: key press
> 1: key not press
>
> right?
Hi, yeah, it means the GPIO pins have inverted voltage levels.
>
> thanks for help.
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