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| author | David S. Miller <davem@davemloft.net> | 2008-07-29 21:51:00 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-07-29 21:51:00 -0700 |
| commit | e93dc4891df93d7efa59d861fdcbb529a1819343 (patch) | |
| tree | 545d95bc78c76d44b22bf2590c033311f44c0616 /Documentation | |
| parent | 6e86841d05f371b5b9b86ce76c02aaee83352298 (diff) | |
| parent | 56a6d13dfd49d90d72a1a962246206719dd9d143 (diff) | |
| download | kernel_samsung_smdk4412-e93dc4891df93d7efa59d861fdcbb529a1819343.zip kernel_samsung_smdk4412-e93dc4891df93d7efa59d861fdcbb529a1819343.tar.gz kernel_samsung_smdk4412-e93dc4891df93d7efa59d861fdcbb529a1819343.tar.bz2 | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/rfkill.txt | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/Documentation/rfkill.txt b/Documentation/rfkill.txt index 0843ed0..28b6ec8 100644 --- a/Documentation/rfkill.txt +++ b/Documentation/rfkill.txt @@ -390,9 +390,10 @@ rfkill lines are inactive, it must return RFKILL_STATE_SOFT_BLOCKED if its soft rfkill input line is active. Only if none of the rfkill input lines are active, will it return RFKILL_STATE_UNBLOCKED. -If it doesn't implement the get_state() hook, it must make sure that its calls -to rfkill_force_state() are enough to keep the status always up-to-date, and it -must do a rfkill_force_state() on resume from sleep. +Since the device has a hardware rfkill line, it IS subject to state changes +external to rfkill. Therefore, the driver must make sure that it calls +rfkill_force_state() to keep the status always up-to-date, and it must do a +rfkill_force_state() on resume from sleep. Every time the driver gets a notification from the card that one of its rfkill lines changed state (polling might be needed on badly designed cards that don't @@ -422,13 +423,24 @@ of the hardware is unknown), or read-write (where the hardware can be queried about its current state). The rfkill class will call the get_state hook of a device every time it needs -to know the *real* current state of the hardware. This can happen often. +to know the *real* current state of the hardware. This can happen often, but +it does not do any polling, so it is not enough on hardware that is subject +to state changes outside of the rfkill subsystem. + +Therefore, calling rfkill_force_state() when a state change happens is +mandatory when the device has a hardware rfkill line, or when something else +like the firmware could cause its state to be changed without going through the +rfkill class. Some hardware provides events when its status changes. In these cases, it is best for the driver to not provide a get_state hook, and instead register the rfkill class *already* with the correct status, and keep it updated using rfkill_force_state() when it gets an event from the hardware. +rfkill_force_state() must be used on the device resume handlers to update the +rfkill status, should there be any chance of the device status changing during +the sleep. + There is no provision for a statically-allocated rfkill struct. You must use rfkill_allocate() to allocate one. |