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Diffstat (limited to 'Documentation/rfkill.txt')
| -rw-r--r-- | Documentation/rfkill.txt | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/Documentation/rfkill.txt b/Documentation/rfkill.txt index b65f0799df48..4d3ee317a4a3 100644 --- a/Documentation/rfkill.txt +++ b/Documentation/rfkill.txt @@ -191,12 +191,20 @@ Userspace input handlers (uevents) or kernel input handlers (rfkill-input): to tell the devices registered with the rfkill class to change their state (i.e. translates the input layer event into real action). + * rfkill-input implements EPO by handling EV_SW SW_RFKILL_ALL 0 (power off all transmitters) in a special way: it ignores any overrides and local state cache and forces all transmitters to the RFKILL_STATE_SOFT_BLOCKED state (including those which are already - supposed to be BLOCKED). Note that the opposite event (power on all - transmitters) is handled normally. + supposed to be BLOCKED). + * rfkill EPO will remain active until rfkill-input receives an + EV_SW SW_RFKILL_ALL 1 event. While the EPO is active, transmitters + are locked in the blocked state (rfkill will refuse to unblock them). + * rfkill-input implements different policies that the user can + select for handling EV_SW SW_RFKILL_ALL 1. It will unlock rfkill, + and either do nothing (leave transmitters blocked, but now unlocked), + restore the transmitters to their state before the EPO, or unblock + them all. Userspace uevent handler or kernel platform-specific drivers hooked to the rfkill notifier chain: @@ -331,11 +339,9 @@ class to get a sysfs interface :-) correct event for your switch/button. These events are emergency power-off events when they are trying to turn the transmitters off. An example of an input device which SHOULD generate *_RFKILL_ALL events is the wireless-kill -switch in a laptop which is NOT a hotkey, but a real switch that kills radios -in hardware, even if the O.S. has gone to lunch. An example of an input device -which SHOULD NOT generate *_RFKILL_ALL events by default, is any sort of hot -key that does nothing by itself, as well as any hot key that is type-specific -(e.g. the one for WLAN). +switch in a laptop which is NOT a hotkey, but a real sliding/rocker switch. +An example of an input device which SHOULD NOT generate *_RFKILL_ALL events by +default, is any sort of hot key that is type-specific (e.g. the one for WLAN). 3.1 Guidelines for wireless device drivers |