Kind of resolved - I tried it over adb and it was working successfully. But I am not still satisfied, want to understand how stuff works.
Firstly: I connected the device using ADB and executed echo 1 > /sys/class/leds/keyboard-backlight/brightness I was abel to see the Leds glow and doing the needful. Is it that that ADB runs as system due to which it is able to do it??? Is there any documentation available which specifies about how permission are set by Android Linux. Please let me know details and links. Thanks, ARVR. On Nov 15, 11:59 am, arvr <venkat.raghav...@gmail.com> wrote: > Yes am executing as root. This is what I do (& the results) after the > device boots up at the command line(through the terminal) > > $ ls /sys/class/leds > green > battery-led > lcd-backlight > keyboard-backlight > $ > $ > $ > $ echo 1 > /sys/class/leds/keyboard-backlight/brightness > cannot create /sys/class/leds/keyboard-backlight/brightness: > permission denied > $ > $ echo 1 > /sys/class/leds/green/brightness > cannot create /sys/class/leds/green/brightness: permission denied > > I understand that by default device will boot up in root permission. > In the init.rc I see that the devices are "chown"ed to system system > > >>>>chown system system /sys/class/leds/keyboard-backlight/brightness > > So I am trying to understand this part of the world and how to get > things done. > Any information or links will be highly appreicated. > Thanks and Regards, > ARVR. > > On Nov 15, 2:09 am, Earlence <earlencefe...@gmail.com> wrote: > > > are you executing this as root? > > > -earlence > > > On Nov 14, 2:47 pm, arvr <venkat.raghav...@gmail.com> wrote: > > > > Hi, > > > > I am trying to access leds from command line (through the terminal), > > > but I am getting "Permission Denied" error and am struck on similar > > > issues.Can you please help me to understand what's wrong. > > > > Environment: > > > a. OMAP 4430 Panda board > > > b. Linux 2.6.36 and Android GB 2.3.3 > > > c. I have integrated the leds and it is visible to me as "/sys/class/ > > > leds/green/" & "/sys/class/leds/keyboard-backlight". > > > > When I perform, > > > echo 1 > /sys/class/leds/green/brightness > > > or > > > echo 1 > /sys/class/leds/keyboard-backlight/brightness > > > > kernel tells me "Permission Denied". I use the regular init.rc file as > > > given in the OMAPPedia website, with the changes done by commenting > > > the line "#mount rootfs rootfs / rw remount" etc. > > > > Similar to this, I am executing the "yavta" tool > > > (https://www.gitorious.org/omap4-v4l2-camera/yavta) and that too is not > > > executing the command, kernel reports me that no such file or folder > > > is present. The tool is copied in the same folder and I run it as > > > yavta -h > > > > What could be reasons? Please help me out. > > > Thanks, > > > ARVR. > > -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
