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rfkill: export persistent attribute in sysfs

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This information allows userspace to implement a hybrid policy where
it can store the rfkill soft-blocked state in platform non-volatile
storage if available, and if not then file-based storage can be used.

Some users prefer platform non-volatile storage because of the behaviour
when dual-booting multiple versions of Linux, or if the rfkill setting
is changed in the BIOS setting screens, or if the BIOS responds to
wireless-toggle hotkeys itself before the relevant platform driver has
been loaded.

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Alan Jenkins 2009-06-16 14:54:04 +01:00 • committed by John W. Linville
parent 96e9cfeb96
commit 464902e812
3 changed files with 15 additions and 2 deletions
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5
include/linux/rfkill.h
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@ -259,8 +259,9 @@ bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked);
* userspace) of their initial state. It should only be used before
* registration.
*
* In addition, it marks the device as "persistent". Persistent devices
* are expected to preserve preserve their own state when suspended.
* In addition, it marks the device as "persistent", an attribute which
* can be read by userspace. Persistent devices are expected to preserve
* their own state when suspended.
*/
void rfkill_init_sw_state(struct rfkill *rfkill, bool blocked);