MODULE_LICENSE("GPL");
static LIST_HEAD(rfkill_list); /* list of registered rf switches */
-static DEFINE_MUTEX(rfkill_mutex);
+static DEFINE_MUTEX(rfkill_global_mutex);
static unsigned int rfkill_default_state = RFKILL_STATE_UNBLOCKED;
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];
-
-static BLOCKING_NOTIFIER_HEAD(rfkill_notifier_list);
-
-
-/**
- * register_rfkill_notifier - Add notifier to rfkill notifier chain
- * @nb: pointer to the new entry to add to the chain
- *
- * See blocking_notifier_chain_register() for return value and further
- * observations.
- *
- * Adds a notifier to the rfkill notifier chain. The chain will be
- * called with a pointer to the relevant rfkill structure as a parameter,
- * refer to include/linux/rfkill.h for the possible events.
- *
- * Notifiers added to this chain are to always return NOTIFY_DONE. This
- * chain is a blocking notifier chain: notifiers can sleep.
- *
- * Calls to this chain may have been done through a workqueue. One must
- * assume unordered asynchronous behaviour, there is no way to know if
- * actions related to the event that generated the notification have been
- * carried out already.
- */
-int register_rfkill_notifier(struct notifier_block *nb)
-{
- return blocking_notifier_chain_register(&rfkill_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(register_rfkill_notifier);
+struct rfkill_gsw_state {
+ enum rfkill_state current_state;
+ enum rfkill_state default_state;
+};
-/**
- * unregister_rfkill_notifier - remove notifier from rfkill notifier chain
- * @nb: pointer to the entry to remove from the chain
- *
- * See blocking_notifier_chain_unregister() for return value and further
- * observations.
- *
- * Removes a notifier from the rfkill notifier chain.
- */
-int unregister_rfkill_notifier(struct notifier_block *nb)
-{
- return blocking_notifier_chain_unregister(&rfkill_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(unregister_rfkill_notifier);
+static struct rfkill_gsw_state rfkill_global_states[RFKILL_TYPE_MAX];
+static unsigned long rfkill_states_lockdflt[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
+static bool rfkill_epo_lock_active;
+#ifdef CONFIG_RFKILL_LEDS
static void rfkill_led_trigger(struct rfkill *rfkill,
enum rfkill_state state)
{
-#ifdef CONFIG_RFKILL_LEDS
struct led_trigger *led = &rfkill->led_trigger;
if (!led->name)
led_trigger_event(led, LED_OFF);
else
led_trigger_event(led, LED_FULL);
-#endif /* CONFIG_RFKILL_LEDS */
}
-#ifdef CONFIG_RFKILL_LEDS
static void rfkill_led_trigger_activate(struct led_classdev *led)
{
struct rfkill *rfkill = container_of(led->trigger,
}
#endif /* CONFIG_RFKILL_LEDS */
-static void notify_rfkill_state_change(struct rfkill *rfkill)
+static void rfkill_uevent(struct rfkill *rfkill)
{
- blocking_notifier_call_chain(&rfkill_notifier_list,
- RFKILL_STATE_CHANGED,
- rfkill);
+ kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
}
static void update_rfkill_state(struct rfkill *rfkill)
oldstate = rfkill->state;
rfkill->state = newstate;
if (oldstate != newstate)
- notify_rfkill_state_change(rfkill);
+ rfkill_uevent(rfkill);
}
mutex_unlock(&rfkill->mutex);
}
* BLOCK even a transmitter that is already in state
* RFKILL_STATE_HARD_BLOCKED */
break;
+ default:
+ WARN(1, KERN_WARNING
+ "rfkill: illegal state %d passed as parameter "
+ "to rfkill_toggle_radio\n", state);
+ return -EINVAL;
}
if (force || state != rfkill->state) {
rfkill->state = state;
}
- if (force || rfkill->state != oldstate) {
- rfkill_led_trigger(rfkill, rfkill->state);
- notify_rfkill_state_change(rfkill);
- }
+ if (force || rfkill->state != oldstate)
+ rfkill_uevent(rfkill);
return retval;
}
/**
- * 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_global_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;
+ if (WARN((state >= RFKILL_STATE_MAX || type >= RFKILL_TYPE_MAX),
+ KERN_WARNING
+ "rfkill: illegal state %d or type %d "
+ "passed as parameter to __rfkill_switch_all\n",
+ state, type))
+ return;
+ 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);
mutex_unlock(&rfkill->mutex);
}
}
+}
- 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_global_mutex and calls __rfkill_switch_all(@type, @state).
+ * Please refer to __rfkill_switch_all() for details.
+ *
+ * Does nothing if the EPO lock is active.
+ */
+void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
+{
+ mutex_lock(&rfkill_global_mutex);
+ if (!rfkill_epo_lock_active)
+ __rfkill_switch_all(type, state);
+ mutex_unlock(&rfkill_global_mutex);
}
EXPORT_SYMBOL(rfkill_switch_all);
* rfkill_epo - emergency power off all transmitters
*
* This kicks all non-suspended rfkill devices to RFKILL_STATE_SOFT_BLOCKED,
- * ignoring everything in its path but rfkill_mutex and rfkill->mutex.
+ * ignoring everything in its path but rfkill_global_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);
+ mutex_lock(&rfkill_global_mutex);
+
+ rfkill_epo_lock_active = true;
list_for_each_entry(rfkill, &rfkill_list, node) {
mutex_lock(&rfkill->mutex);
rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
mutex_unlock(&rfkill->mutex);
}
- 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_global_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_global_mutex);
+
+ rfkill_epo_lock_active = false;
+ for (i = 0; i < RFKILL_TYPE_MAX; i++)
+ __rfkill_switch_all(i, rfkill_global_states[i].default_state);
+ mutex_unlock(&rfkill_global_mutex);
+}
+EXPORT_SYMBOL_GPL(rfkill_restore_states);
+
+/**
+ * rfkill_remove_epo_lock - unlock state changes
+ *
+ * Used by rfkill-input manually unlock state changes, when
+ * the EPO switch is deactivated.
+ */
+void rfkill_remove_epo_lock(void)
+{
+ mutex_lock(&rfkill_global_mutex);
+ rfkill_epo_lock_active = false;
+ mutex_unlock(&rfkill_global_mutex);
+}
+EXPORT_SYMBOL_GPL(rfkill_remove_epo_lock);
+
+/**
+ * rfkill_is_epo_lock_active - returns true EPO is active
+ *
+ * Returns 0 (false) if there is NOT an active EPO contidion,
+ * and 1 (true) if there is an active EPO contition, which
+ * locks all radios in one of the BLOCKED states.
+ *
+ * Can be called in atomic context.
+ */
+bool rfkill_is_epo_lock_active(void)
+{
+ return rfkill_epo_lock_active;
+}
+EXPORT_SYMBOL_GPL(rfkill_is_epo_lock_active);
+
+/**
+ * rfkill_get_global_state - returns global state for a type
+ * @type: the type to get the global state of
+ *
+ * Returns the current global state for a given wireless
+ * device type.
+ */
+enum rfkill_state rfkill_get_global_state(const enum rfkill_type type)
+{
+ return rfkill_global_states[type].current_state;
+}
+EXPORT_SYMBOL_GPL(rfkill_get_global_state);
+
/**
* rfkill_force_state - Force the internal rfkill radio state
* @rfkill: pointer to the rfkill class to modify.
{
enum rfkill_state oldstate;
- if (state != RFKILL_STATE_SOFT_BLOCKED &&
- state != RFKILL_STATE_UNBLOCKED &&
- state != RFKILL_STATE_HARD_BLOCKED)
+ BUG_ON(!rfkill);
+ if (WARN((state >= RFKILL_STATE_MAX),
+ KERN_WARNING
+ "rfkill: illegal state %d passed as parameter "
+ "to rfkill_force_state\n", state))
return -EINVAL;
mutex_lock(&rfkill->mutex);
rfkill->state = state;
if (state != oldstate)
- notify_rfkill_state_change(rfkill);
+ rfkill_uevent(rfkill);
mutex_unlock(&rfkill->mutex);
const char *buf, size_t count)
{
struct rfkill *rfkill = to_rfkill(dev);
- unsigned int state = simple_strtoul(buf, NULL, 0);
+ unsigned long state;
int error;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
+ error = strict_strtoul(buf, 0, &state);
+ if (error)
+ return error;
+
/* RFKILL_STATE_HARD_BLOCKED is illegal here... */
if (state != RFKILL_STATE_UNBLOCKED &&
state != RFKILL_STATE_SOFT_BLOCKED)
return -EINVAL;
- if (mutex_lock_interruptible(&rfkill->mutex))
- return -ERESTARTSYS;
- error = rfkill_toggle_radio(rfkill, state, 0);
+ error = mutex_lock_killable(&rfkill->mutex);
+ if (error)
+ return error;
+
+ if (!rfkill_epo_lock_active)
+ error = rfkill_toggle_radio(rfkill, state, 0);
+ else
+ error = -EPERM;
+
mutex_unlock(&rfkill->mutex);
return error ? error : count;
const char *buf, size_t count)
{
struct rfkill *rfkill = to_rfkill(dev);
- bool claim = !!simple_strtoul(buf, NULL, 0);
+ unsigned long claim_tmp;
+ bool claim;
int error;
if (!capable(CAP_NET_ADMIN))
if (rfkill->user_claim_unsupported)
return -EOPNOTSUPP;
+ error = strict_strtoul(buf, 0, &claim_tmp);
+ if (error)
+ return error;
+ claim = !!claim_tmp;
+
/*
* Take the global lock to make sure the kernel is not in
* the middle of rfkill_switch_all
*/
- error = mutex_lock_interruptible(&rfkill_mutex);
+ error = mutex_lock_killable(&rfkill_global_mutex);
if (error)
return error;
if (rfkill->user_claim != claim) {
- if (!claim) {
+ if (!claim && !rfkill_epo_lock_active) {
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;
}
- mutex_unlock(&rfkill_mutex);
+ mutex_unlock(&rfkill_global_mutex);
return error ? error : count;
}
{
struct rfkill *rfkill = to_rfkill(dev);
- if (dev->power.power_state.event != state.event) {
- if (state.event & PM_EVENT_SLEEP) {
- /* Stop transmitter, keep state, no notifies */
- update_rfkill_state(rfkill);
-
- mutex_lock(&rfkill->mutex);
- rfkill->toggle_radio(rfkill->data,
- RFKILL_STATE_SOFT_BLOCKED);
- mutex_unlock(&rfkill->mutex);
- }
-
+ /* mark class device as suspended */
+ if (dev->power.power_state.event != state.event)
dev->power.power_state = state;
- }
+
+ /* store state for the resume handler */
+ rfkill->state_for_resume = rfkill->state;
return 0;
}
static int rfkill_resume(struct device *dev)
{
struct rfkill *rfkill = to_rfkill(dev);
+ enum rfkill_state newstate;
if (dev->power.power_state.event != PM_EVENT_ON) {
mutex_lock(&rfkill->mutex);
dev->power.power_state.event = PM_EVENT_ON;
- /* restore radio state AND notify everybody */
- rfkill_toggle_radio(rfkill, rfkill->state, 1);
+ /*
+ * rfkill->state could have been modified before we got
+ * called, and won't be updated by rfkill_toggle_radio()
+ * in force mode. Sync it FIRST.
+ */
+ if (rfkill->get_state &&
+ !rfkill->get_state(rfkill->data, &newstate))
+ rfkill->state = newstate;
+
+ /*
+ * If we are under EPO, kick transmitter offline,
+ * otherwise restore to pre-suspend state.
+ *
+ * Issue a notification in any case
+ */
+ rfkill_toggle_radio(rfkill,
+ rfkill_epo_lock_active ?
+ RFKILL_STATE_SOFT_BLOCKED :
+ rfkill->state_for_resume,
+ 1);
mutex_unlock(&rfkill->mutex);
}
#define rfkill_resume NULL
#endif
-static int rfkill_blocking_uevent_notifier(struct notifier_block *nb,
- unsigned long eventid,
- void *data)
-{
- struct rfkill *rfkill = (struct rfkill *)data;
-
- switch (eventid) {
- case RFKILL_STATE_CHANGED:
- kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
- break;
- default:
- break;
- }
-
- return NOTIFY_DONE;
-}
-
-static struct notifier_block rfkill_blocking_uevent_nb = {
- .notifier_call = rfkill_blocking_uevent_notifier,
- .priority = 0,
-};
-
static int rfkill_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct rfkill *rfkill = to_rfkill(dev);
.dev_uevent = rfkill_dev_uevent,
};
+static int rfkill_check_duplicity(const struct rfkill *rfkill)
+{
+ struct rfkill *p;
+ unsigned long seen[BITS_TO_LONGS(RFKILL_TYPE_MAX)];
+
+ memset(seen, 0, sizeof(seen));
+
+ list_for_each_entry(p, &rfkill_list, node) {
+ if (WARN((p == rfkill), KERN_WARNING
+ "rfkill: illegal attempt to register "
+ "an already registered rfkill struct\n"))
+ return -EEXIST;
+ set_bit(p->type, seen);
+ }
+
+ /* 0: first switch of its kind */
+ return (test_bit(rfkill->type, seen)) ? 1 : 0;
+}
+
static int rfkill_add_switch(struct rfkill *rfkill)
{
- mutex_lock(&rfkill_mutex);
+ int error;
- rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type], 0);
+ mutex_lock(&rfkill_global_mutex);
+
+ error = rfkill_check_duplicity(rfkill);
+ if (error < 0)
+ goto unlock_out;
+
+ 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);
- mutex_unlock(&rfkill_mutex);
+ error = 0;
+unlock_out:
+ mutex_unlock(&rfkill_global_mutex);
- return 0;
+ return error;
}
static void rfkill_remove_switch(struct rfkill *rfkill)
{
- mutex_lock(&rfkill_mutex);
+ mutex_lock(&rfkill_global_mutex);
list_del_init(&rfkill->node);
- mutex_unlock(&rfkill_mutex);
+ mutex_unlock(&rfkill_global_mutex);
mutex_lock(&rfkill->mutex);
rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
* NOTE: If registration fails the structure shoudl be freed by calling
* rfkill_free() otherwise rfkill_unregister() should be used.
*/
-struct rfkill *rfkill_allocate(struct device *parent, enum rfkill_type type)
+struct rfkill * __must_check rfkill_allocate(struct device *parent,
+ enum rfkill_type type)
{
struct rfkill *rfkill;
struct device *dev;
+ if (WARN((type >= RFKILL_TYPE_MAX),
+ KERN_WARNING
+ "rfkill: illegal type %d passed as parameter "
+ "to rfkill_allocate\n", type))
+ return NULL;
+
rfkill = kzalloc(sizeof(struct rfkill), GFP_KERNEL);
if (!rfkill)
return NULL;
int error;
if (!rfkill->led_trigger.name)
- rfkill->led_trigger.name = rfkill->dev.bus_id;
+ rfkill->led_trigger.name = dev_name(&rfkill->dev);
if (!rfkill->led_trigger.activate)
rfkill->led_trigger.activate = rfkill_led_trigger_activate;
error = led_trigger_register(&rfkill->led_trigger);
* structure needs to be registered. Immediately from registration the
* switch driver should be able to service calls to toggle_radio.
*/
-int rfkill_register(struct rfkill *rfkill)
+int __must_check rfkill_register(struct rfkill *rfkill)
{
static atomic_t rfkill_no = ATOMIC_INIT(0);
struct device *dev = &rfkill->dev;
int error;
- if (!rfkill->toggle_radio)
- return -EINVAL;
- if (rfkill->type >= RFKILL_TYPE_MAX)
+ if (WARN((!rfkill || !rfkill->toggle_radio ||
+ rfkill->type >= RFKILL_TYPE_MAX ||
+ rfkill->state >= RFKILL_STATE_MAX),
+ KERN_WARNING
+ "rfkill: attempt to register a "
+ "badly initialized rfkill struct\n"))
return -EINVAL;
- snprintf(dev->bus_id, sizeof(dev->bus_id),
- "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
+ dev_set_name(dev, "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
rfkill_led_trigger_register(rfkill);
*/
void rfkill_unregister(struct rfkill *rfkill)
{
+ BUG_ON(!rfkill);
device_del(&rfkill->dev);
rfkill_remove_switch(rfkill);
rfkill_led_trigger_unregister(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 (WARN((type >= RFKILL_TYPE_MAX ||
+ (state != RFKILL_STATE_SOFT_BLOCKED &&
+ state != RFKILL_STATE_UNBLOCKED)),
+ KERN_WARNING
+ "rfkill: illegal state %d or type %d passed as "
+ "parameter to rfkill_set_default\n", state, type))
+ return -EINVAL;
+
+ mutex_lock(&rfkill_global_mutex);
+
+ if (!test_and_set_bit(type, rfkill_states_lockdflt)) {
+ rfkill_global_states[type].default_state = state;
+ rfkill_global_states[type].current_state = state;
+ error = 0;
+ } else
+ error = -EPERM;
+
+ mutex_unlock(&rfkill_global_mutex);
+ return error;
+}
+EXPORT_SYMBOL_GPL(rfkill_set_default);
+
/*
* Rfkill module initialization/deinitialization.
*/
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) {
return error;
}
- register_rfkill_notifier(&rfkill_blocking_uevent_nb);
-
return 0;
}
static void __exit rfkill_exit(void)
{
- unregister_rfkill_notifier(&rfkill_blocking_uevent_nb);
class_unregister(&rfkill_class);
}
projects / linux-2.6-omap-h63xx.git / blobdiff