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rfkill: add default global states (v2) 

Add a second set of global states, "rfkill_default_states", to track the
state that will be used when the first rfkill class of a given type is
registered, and also to save "undo" information when rfkill_epo is called.

Add a new exported function, rfkill_set_default(), which can be used by
platform drivers to restore radio state saved by the platform across
reboots or shutdown.

Also, fix rfkill_epo to properly update rfkill_states, but still preserve a
copy of the state so that we can undo the effect of rfkill_epo later if we
want to.  Add rfkill_restore_states() to restore rfkill_states from the
copy.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Henrique de Moraes Holschuh 2008-08-02 15:10:58 -03:00 committed by John W. Linville
parent 02589f6051
commit 9961920199
3 changed files with 117 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/rfkill.h
View File

@ -116,6 +116,7 @@ int rfkill_register(struct rfkill *rfkill);
void rfkill_unregister(struct rfkill *rfkill);
int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state);
int rfkill_set_default(enum rfkill_type type, enum rfkill_state state);
/**
* rfkill_state_complement - return complementar state

1
net/rfkill/rfkill-input.h
View File

@ -13,5 +13,6 @@
void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state);
void rfkill_epo(void);
void rfkill_restore_states(void);
#endif /* __RFKILL_INPUT_H */

127
net/rfkill/rfkill.c
View File

@ -44,7 +44,13 @@ module_param_named(default_state, rfkill_default_state, uint, 0444);
MODULE_PARM_DESC(default_state,
"Default initial state for all radio types, 0 = radio off");
static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
struct rfkill_gsw_state {
enum rfkill_state current_state;
enum rfkill_state default_state;
};
static struct rfkill_gsw_state rfkill_global_states[RFKILL_TYPE_MAX];
static unsigned long rfkill_states_lockdflt[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
static BLOCKING_NOTIFIER_HEAD(rfkill_notifier_list);
@ -213,22 +219,22 @@ static int rfkill_toggle_radio(struct rfkill *rfkill,
}
/**
* rfkill_switch_all - Toggle state of all switches of given type
* __rfkill_switch_all - Toggle state of all switches of given type
* @type: type of interfaces to be affected
* @state: the new state
*
* This function toggles the state of all switches of given type,
* unless a specific switch is claimed by userspace (in which case,
* that switch is left alone) or suspended.
*
* Caller must have acquired rfkill_mutex.
*/
void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
static void __rfkill_switch_all(const enum rfkill_type type,
const enum rfkill_state state)
{
struct rfkill *rfkill;
mutex_lock(&rfkill_mutex);
rfkill_states[type] = state;
rfkill_global_states[type].current_state = state;
list_for_each_entry(rfkill, &rfkill_list, node) {
if ((!rfkill->user_claim) && (rfkill->type == type)) {
mutex_lock(&rfkill->mutex);
@ -236,7 +242,20 @@ void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
mutex_unlock(&rfkill->mutex);
}
}
}
/**
* rfkill_switch_all - Toggle state of all switches of given type
* @type: type of interfaces to be affected
* @state: the new state
*
* Acquires rfkill_mutex and calls __rfkill_switch_all(@type, @state).
* Please refer to __rfkill_switch_all() for details.
*/
void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
{
mutex_lock(&rfkill_mutex);
__rfkill_switch_all(type, state);
mutex_unlock(&rfkill_mutex);
}
EXPORT_SYMBOL(rfkill_switch_all);
@ -246,10 +265,14 @@ EXPORT_SYMBOL(rfkill_switch_all);
*
* This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
* ignoring everything in its path but rfkill_mutex and rfkill->mutex.
*
* The global state before the EPO is saved and can be restored later
* using rfkill_restore_states().
*/
void rfkill_epo(void)
{
struct rfkill *rfkill;
int i;
mutex_lock(&rfkill_mutex);
list_for_each_entry(rfkill, &rfkill_list, node) {
@ -257,10 +280,34 @@ void rfkill_epo(void)
rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
mutex_unlock(&rfkill->mutex);
}
for (i = 0; i < RFKILL_TYPE_MAX; i++) {
rfkill_global_states[i].default_state =
rfkill_global_states[i].current_state;
rfkill_global_states[i].current_state =
RFKILL_STATE_SOFT_BLOCKED;
}
mutex_unlock(&rfkill_mutex);
}
EXPORT_SYMBOL_GPL(rfkill_epo);
/**
* rfkill_restore_states - restore global states
*
* Restore (and sync switches to) the global state from the
* states in rfkill_default_states. This can undo the effects of
* a call to rfkill_epo().
*/
void rfkill_restore_states(void)
{
int i;
mutex_lock(&rfkill_mutex);
for (i = 0; i < RFKILL_TYPE_MAX; i++)
__rfkill_switch_all(i, rfkill_global_states[i].default_state);
mutex_unlock(&rfkill_mutex);
}
EXPORT_SYMBOL_GPL(rfkill_restore_states);
/**
* rfkill_force_state - Force the internal rfkill radio state
* @rfkill: pointer to the rfkill class to modify.
@ -406,8 +453,8 @@ static ssize_t rfkill_claim_store(struct device *dev,
if (!claim) {
mutex_lock(&rfkill->mutex);
rfkill_toggle_radio(rfkill,
rfkill_states[rfkill->type],
0);
rfkill_global_states[rfkill->type].current_state,
0);
mutex_unlock(&rfkill->mutex);
}
rfkill->user_claim = claim;
@ -554,7 +601,16 @@ static int rfkill_add_switch(struct rfkill *rfkill)
if (error < 0)
goto unlock_out;
rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type], 0);
if (!error) {
/* lock default after first use */
set_bit(rfkill->type, rfkill_states_lockdflt);
rfkill_global_states[rfkill->type].current_state =
rfkill_global_states[rfkill->type].default_state;
}
rfkill_toggle_radio(rfkill,
rfkill_global_states[rfkill->type].current_state,
0);
list_add_tail(&rfkill->node, &rfkill_list);
@ -710,6 +766,53 @@ void rfkill_unregister(struct rfkill *rfkill)
}
EXPORT_SYMBOL(rfkill_unregister);
/**
* rfkill_set_default - set initial value for a switch type
* @type - the type of switch to set the default state of
* @state - the new default state for that group of switches
*
* Sets the initial state rfkill should use for a given type.
* The following initial states are allowed: RFKILL_STATE_SOFT_BLOCKED
* and RFKILL_STATE_UNBLOCKED.
*
* This function is meant to be used by platform drivers for platforms
* that can save switch state across power down/reboot.
*
* The default state for each switch type can be changed exactly once.
* After a switch of that type is registered, the default state cannot
* be changed anymore. This guards against multiple drivers it the
* same platform trying to set the initial switch default state, which
* is not allowed.
*
* Returns -EPERM if the state has already been set once or is in use,
* so drivers likely want to either ignore or at most printk(KERN_NOTICE)
* if this function returns -EPERM.
*
* Returns 0 if the new default state was set, or an error if it
* could not be set.
*/
int rfkill_set_default(enum rfkill_type type, enum rfkill_state state)
{
int error;
if (type >= RFKILL_TYPE_MAX ||
(state != RFKILL_STATE_SOFT_BLOCKED &&
state != RFKILL_STATE_UNBLOCKED))
return -EINVAL;
mutex_lock(&rfkill_mutex);
if (!test_and_set_bit(type, rfkill_states_lockdflt)) {
rfkill_global_states[type].default_state = state;
error = 0;
} else
error = -EPERM;
mutex_unlock(&rfkill_mutex);
return error;
}
EXPORT_SYMBOL_GPL(rfkill_set_default);
/*
* Rfkill module initialization/deinitialization.
*/
@ -723,8 +826,8 @@ static int __init rfkill_init(void)
rfkill_default_state != RFKILL_STATE_UNBLOCKED)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(rfkill_states); i++)
rfkill_states[i] = rfkill_default_state;
for (i = 0; i < RFKILL_TYPE_MAX; i++)
rfkill_global_states[i].default_state = rfkill_default_state;
error = class_register(&rfkill_class);
if (error) {