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rfkill: export persistent attribute in sysfs 

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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2
Documentation/rfkill.txt
View File

@ -111,6 +111,8 @@ following attributes:
name: Name assigned by driver to this key (interface or driver name).
type: Driver type string ("wlan", "bluetooth", etc).
persistent: Whether the soft blocked state is initialised from
non-volatile storage at startup.
state: Current state of the transmitter
0: RFKILL_STATE_SOFT_BLOCKED
transmitter is turned off by software

5
include/linux/rfkill.h
View File

@ -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);

10
net/rfkill/core.c
View File

@ -610,6 +610,15 @@ static ssize_t rfkill_idx_show(struct device *dev,
return sprintf(buf, "%d\n", rfkill->idx);
}
static ssize_t rfkill_persistent_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct rfkill *rfkill = to_rfkill(dev);
return sprintf(buf, "%d\n", rfkill->persistent);
}
static u8 user_state_from_blocked(unsigned long state)
{
if (state & RFKILL_BLOCK_HW)
@ -668,6 +677,7 @@ static struct device_attribute rfkill_dev_attrs[] = {
__ATTR(name, S_IRUGO, rfkill_name_show, NULL),
__ATTR(type, S_IRUGO, rfkill_type_show, NULL),
__ATTR(index, S_IRUGO, rfkill_idx_show, NULL),
__ATTR(persistent, S_IRUGO, rfkill_persistent_show, NULL),
__ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
__ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
__ATTR_NULL