* 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; 3+ 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] 3+ 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; 3+ 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. -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: what is the meaning of matrix_keypad_platform_data.active_low @ 2009-08-25 10:21 ` Marek Vasut 0 siblings, 0 replies; 3+ 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. ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2009-08-25 10:21 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 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 2009-08-25 10:21 ` Marek Vasut
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