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Etal
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 Posted: Fri Sep 10, 2010 11:29 pm Post subject: [SOLVED] How to start wpa_supplicant on rfkill switch flip? |
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Hi everyone,
My laptop has a switch that controls the wireless, and when I don't need it, I like to turn it off. However, the problem is that when I turn it back on, I need to restart wpa_supplicant.
So my question is, is there a way to trigger a script when I flip the switch, like with ACPI events?
Thanks in advance!
Last edited by Etal on Sat Sep 11, 2010 9:11 pm; edited 1 time in total |
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toralf
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| Posted: Sat Sep 11, 2010 6:54 am Post subject: |
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| Switching that key should give an ACPI event which can be processed in /etc/acpi/defaults.sh. |
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Etal
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| Posted: Sat Sep 11, 2010 3:55 pm Post subject: |
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Nope, it gets logged, but not due to ACPI:
| Code: | logger: ACPI event unhandled: video/brightnessdown BRTDN 00000087 00000000
klogd: iwlagn 0000:03:00.0: RF_KILL bit toggled to enable radio.
klogd: usb 1-1.4: new full speed USB device using ehci_hcd and address 11
klogd: iwlagn 0000:03:00.0: RF_KILL bit toggled to disable radio.
klogd: usb 1-1.4: USB disconnect, address 11 |
(It's not a keyboard button, it's a physical switch) |
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toralf
Developer
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| Posted: Sat Sep 11, 2010 4:16 pm Post subject: |
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| AM088 wrote: | | [code]video/brightnessdown BRTDN 00000087 00000000 |
This can be used in the ACPI script, isn't it ? |
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Etal
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| Posted: Sat Sep 11, 2010 4:35 pm Post subject: |
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| toralf wrote: | | AM088 wrote: | | [code]video/brightnessdown BRTDN 00000087 00000000 |
This can be used in the ACPI script, isn't it ? |
No, that's the brightness-down which gets caught by ACPI. I put it there for contrast with the rfkill event - flipping the switch on and off (the other 4 lines) gets caught by syslog, but there is no ACPI event. |
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Etal
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| Posted: Sat Sep 11, 2010 8:37 pm Post subject: |
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Well, turns out hardware events are handles by a piece of software called udev. Who would have known? 
After reading Daniel Drakes udev rules guide, I came up with a solution which somewhat works.
In /etc/udev/rules.d/, I created a file:
| /etc/udev/rules.d/40-rfkill.rules: | | SUBSYSTEM=="rfkill", ATTR{type}=="wlan", RUN+="/etc/udev/rfkill.sh" |
and the corresponding script (mode 755): Edit: this script is wrong. See fixed one below
| /etc/udev/rfkill.sh: | #!/bin/bash
if [ "${RFKILL_STATE}" == 2 ]; then
/etc/init.d/wpa_supplicant stop
else
/etc/init.d/wpa_supplicant start
fi |
The only problem is that for some reason, every time I flip the switch, two seemingly identical events fire off. When turning off, they both have $RFKILL_STATE equal to 2, but when I turn it off, one has 0 and the other has 1, which is why I check only for the "2". The problem is that things get wierd if I use software rfkill, but I don't really need to do that.
Last edited by Etal on Sat Sep 11, 2010 9:07 pm; edited 1 time in total |
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toralf
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| Posted: Sat Sep 11, 2010 8:44 pm Post subject: |
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Wel, with a ThinkPad it is much easier b/c it has an ACPI event for that: | Code: | | logger: ACPI event : ibm/hotkey HKEY 00000080 00007000 |
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Etal
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Posts: 1932
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| Posted: Sat Sep 11, 2010 9:06 pm Post subject: |
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Actually this is a ThinkPad, a T410 
There is an ACPI event on Fn+F5 (which does a software-block), but not the little switch on the side.
Also, after reading through some documentation, I found out that the "normal" RFKILL_STATE is "1", while "0" is software-blocked, and "2" is hardware-blocked.
So the fixed script which works with both soft ahnd hard blocks is:
| /etc/udev/rfkill.sh: | #!/bin/bash
if [ "${RFKILL_STATE}" == 1 ]; then
/etc/init.d/wpa_supplicant start
else # state is 0 or 2
/etc/init.d/wpa_supplicant stop
fi |
Now, on to discover more cool things to do with udev  |
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DONAHUE
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Joined: 09 Dec 2006
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Location: Goose Creek SC
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Etal
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Posts: 1932
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| Posted: Wed Sep 15, 2010 8:23 pm Post subject: |
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| Glad it helped someone else |
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mamac
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Joined: 29 Feb 2004
Posts: 890
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| Posted: Tue Aug 16, 2011 8:24 pm Post subject: |
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Etal,
How do you got that ${RFKILL_STATE} variable field with a value?
I can see the value in /sys/class/rfkill/rfkill0/uevent, but still this variable is blank here...
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