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Re: [Gumstix-users] Turn Off/ON Wi-Fi and bluetooth at hardware level
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From: Markus S. <msv...@ae...> - 2011-01-21 16:33:57
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Hi Akshay, I while ago I experimented with the rfkill kernel module, to try to accomplish exactly what you are trying to do. You can enable rfkill by using menuconfig, then rebuilding your kernel. (As always if you only rebuild your kernel, then make sure you also reinstall the modules when you install the new kernel.) Rfkill appeared to install properly, and all of the expected devices and interfaces were created (/dev/rfkill and sysfs). Sending the off/on commands to the rfkill interfaces did not cause any errors, but also had absolutely no effect on the ability of the WiFi module to emit RF. In my tests, I connected to a wireless network, then issued the rfkill off command, and afterward was still able to access the internet via WiFi. Perhaps a real Linux kernel hacker, or someone familiar with the libertas and rfkill drivers can comment on this? It would be extremely useful to have rfkill working, particularly if you want to use the Gumstix Overo in environments where RF transmissions are forbidden (e.g. some underground mine sites, and so on). Regards, Markus. On 2011.01.19 10:58, Akshay S.N wrote: > So, how do i enable back. if i set it back to high will the modules > work properly. Has anyone tried without restarting the entire board to > turn down and bring up back. > > Akshay > > On Wed, Jan 19, 2011 at 8:09 PM, Rick Rogers > <Ric...@jh... <mailto:Ric...@jh...>> wrote: > > I found the following info in a post a while back... > > # disable wifi > echo 0 > /sys/class/gpio/gpio16/value > # disable bluetooth > echo 0 > /sys/class/gpio/gpio164/value > > The current reading drops from 0.48 to 0.42 amps after executing > the above. > > > > > > On 01/19/2011 09:01 AM, Leif Zars wrote: >> I have found that if I pull the reset pin low on the wifi chip that kindof works. I think gpio16 not sure. But I am unable to restart or reload the firmware on the wifi mod. So without a full board rest it doesn't turn back on. >> >> So once down it stays down. >> >> Also I know this is a ugly hack :(. But it does drop the power >> >> >> I think a new version of the libertas driver might help but I have not found out of to get that done. >> >> Leif Zars >> >> >> On Jan 19, 2011, at 4:22 AM, "Akshay S.N"<aks...@gm...> <mailto:aks...@gm...> wrote: >> >>> Hello, >>> >>> I have an Overo Fire with wi2wi module on it providing Bluetooth and Wi-Fi interface. I want to reduce the power consumed by the overo fire. So i turned off bluetooth using /etc/init.d/bluetooth stop and Wi-fi by iwconfig wlan0 down. >>> >>> However i do not see any reduction in power consumed. So i need to know other ways so that at the hardware level i should be able to enable and disable it. I believe by giving low/high inputs to particular GPIO pins it should work. >>> >>> So is there any one who have tried it and can someone help us?? >>> >>> -- >>> Regards, >>> Akshay >>> ------------------------------------------------------------------------------ >>> Protect Your Site and Customers from Malware Attacks >>> Learn about various malware tactics and how to avoid them. Understand >>> malware threats, the impact they can have on your business, and how you >>> can protect your company and customers by using code signing. >>> http://p.sf.net/sfu/oracle-sfdevnl >>> _______________________________________________ >>> gumstix-users mailing list >>> gum...@li... <mailto:gum...@li...> >>> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> ------------------------------------------------------------------------------ >> Protect Your Site and Customers from Malware Attacks >> Learn about various malware tactics and how to avoid them. Understand >> malware threats, the impact they can have on your business, and how you >> can protect your company and customers by using code signing. >> http://p.sf.net/sfu/oracle-sfdevnl >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... <mailto:gum...@li...> >> https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > ------------------------------------------------------------------------------ > Protect Your Site and Customers from Malware Attacks > Learn about various malware tactics and how to avoid them. Understand > malware threats, the impact they can have on your business, and > how you > can protect your company and customers by using code signing. > http://p.sf.net/sfu/oracle-sfdevnl > _______________________________________________ > gumstix-users mailing list > gum...@li... > <mailto:gum...@li...> > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > > -- > Regards, > Akshay > > > ------------------------------------------------------------------------------ > Protect Your Site and Customers from Malware Attacks > Learn about various malware tactics and how to avoid them. Understand > malware threats, the impact they can have on your business, and how you > can protect your company and customers by using code signing. > http://p.sf.net/sfu/oracle-sfdevnl > > > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users |