#include <linux/mutex.h>
#include <linux/rfkill.h>
+/* Get declaration of rfkill_switch_all() to shut up sparse. */
+#include "rfkill-input.h"
+
+
MODULE_AUTHOR("Ivo van Doorn <IvDoorn@gmail.com>");
MODULE_VERSION("1.0");
MODULE_DESCRIPTION("RF switch support");
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");
+
+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 bool rfkill_epo_lock_active;
-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)
+{
+ BUG_ON(!nb);
+ return blocking_notifier_chain_register(&rfkill_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_rfkill_notifier);
+
+/**
+ * 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)
+{
+ BUG_ON(!nb);
+ return blocking_notifier_chain_unregister(&rfkill_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_rfkill_notifier);
static void rfkill_led_trigger(struct rfkill *rfkill,
if (!led->name)
return;
- if (state == RFKILL_STATE_OFF)
+ if (state != RFKILL_STATE_UNBLOCKED)
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,
+ struct rfkill, led_trigger);
+
+ rfkill_led_trigger(rfkill, rfkill->state);
+}
+#endif /* CONFIG_RFKILL_LEDS */
+
+static void notify_rfkill_state_change(struct rfkill *rfkill)
+{
+ rfkill_led_trigger(rfkill, rfkill->state);
+ blocking_notifier_call_chain(&rfkill_notifier_list,
+ RFKILL_STATE_CHANGED,
+ rfkill);
+}
+
+static void update_rfkill_state(struct rfkill *rfkill)
+{
+ enum rfkill_state newstate, oldstate;
+
+ if (rfkill->get_state) {
+ mutex_lock(&rfkill->mutex);
+ if (!rfkill->get_state(rfkill->data, &newstate)) {
+ oldstate = rfkill->state;
+ rfkill->state = newstate;
+ if (oldstate != newstate)
+ notify_rfkill_state_change(rfkill);
+ }
+ mutex_unlock(&rfkill->mutex);
+ }
+}
+
+/**
+ * rfkill_toggle_radio - wrapper for toggle_radio hook
+ * @rfkill: the rfkill struct to use
+ * @force: calls toggle_radio even if cache says it is not needed,
+ * and also makes sure notifications of the state will be
+ * sent even if it didn't change
+ * @state: the new state to call toggle_radio() with
+ *
+ * Calls rfkill->toggle_radio, enforcing the API for toggle_radio
+ * calls and handling all the red tape such as issuing notifications
+ * if the call is successful.
+ *
+ * Suspended devices are not touched at all, and -EAGAIN is returned.
+ *
+ * Note that the @force parameter cannot override a (possibly cached)
+ * state of RFKILL_STATE_HARD_BLOCKED. Any device making use of
+ * RFKILL_STATE_HARD_BLOCKED implements either get_state() or
+ * rfkill_force_state(), so the cache either is bypassed or valid.
+ *
+ * Note that we do call toggle_radio for RFKILL_STATE_SOFT_BLOCKED
+ * even if the radio is in RFKILL_STATE_HARD_BLOCKED state, so as to
+ * give the driver a hint that it should double-BLOCK the transmitter.
+ *
+ * Caller must have acquired rfkill->mutex.
+ */
static int rfkill_toggle_radio(struct rfkill *rfkill,
- enum rfkill_state state)
+ enum rfkill_state state,
+ int force)
{
- int retval;
+ int retval = 0;
+ enum rfkill_state oldstate, newstate;
+
+ if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
+ return -EBUSY;
- retval = mutex_lock_interruptible(&rfkill->mutex);
- if (retval)
- return retval;
+ oldstate = rfkill->state;
- if (state != rfkill->state) {
+ if (rfkill->get_state && !force &&
+ !rfkill->get_state(rfkill->data, &newstate))
+ rfkill->state = newstate;
+
+ switch (state) {
+ case RFKILL_STATE_HARD_BLOCKED:
+ /* typically happens when refreshing hardware state,
+ * such as on resume */
+ state = RFKILL_STATE_SOFT_BLOCKED;
+ break;
+ case RFKILL_STATE_UNBLOCKED:
+ /* force can't override this, only rfkill_force_state() can */
+ if (rfkill->state == RFKILL_STATE_HARD_BLOCKED)
+ return -EPERM;
+ break;
+ case RFKILL_STATE_SOFT_BLOCKED:
+ /* nothing to do, we want to give drivers the hint to double
+ * 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) {
retval = rfkill->toggle_radio(rfkill->data, state);
- if (!retval) {
+ /* never allow a HARD->SOFT downgrade! */
+ if (!retval && rfkill->state != RFKILL_STATE_HARD_BLOCKED)
rfkill->state = state;
- rfkill_led_trigger(rfkill, state);
- }
}
- mutex_unlock(&rfkill->mutex);
+ if (force || rfkill->state != oldstate)
+ notify_rfkill_state_change(rfkill);
+
return retval;
}
/**
- * rfkill_switch_all - Toggle state of all switches of given type
- * @type: type of interfaces to be affeceted
+ * __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 state of all switches of given type unless
- * a specific switch is claimed by userspace in which case it is
- * left alone.
+ * 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.
*/
+static void __rfkill_switch_all(const enum rfkill_type type,
+ const enum rfkill_state state)
+{
+ struct rfkill *rfkill;
+
+ 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);
+ rfkill_toggle_radio(rfkill, state, 0);
+ 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)
{
- struct rfkill *rfkill;
+ 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);
- mutex_lock(&rfkill_mutex);
+/**
+ * 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_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;
- rfkill_states[type] = state;
+ mutex_lock(&rfkill_global_mutex);
+ rfkill_epo_lock_active = true;
list_for_each_entry(rfkill, &rfkill_list, node) {
- if (!rfkill->user_claim)
- rfkill_toggle_radio(rfkill, state);
+ mutex_lock(&rfkill->mutex);
+ 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_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);
- mutex_unlock(&rfkill_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(rfkill_switch_all);
+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.
+ * @state: the current radio state the class should be forced to.
+ *
+ * This function updates the internal state of the radio cached
+ * by the rfkill class. It should be used when the driver gets
+ * a notification by the firmware/hardware of the current *real*
+ * state of the radio rfkill switch.
+ *
+ * Devices which are subject to external changes on their rfkill
+ * state (such as those caused by a hardware rfkill line) MUST
+ * have their driver arrange to call rfkill_force_state() as soon
+ * as possible after such a change.
+ *
+ * This function may not be called from an atomic context.
+ */
+int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state)
+{
+ enum rfkill_state oldstate;
+
+ 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);
+
+ oldstate = rfkill->state;
+ rfkill->state = state;
+
+ if (state != oldstate)
+ notify_rfkill_state_change(rfkill);
+
+ mutex_unlock(&rfkill->mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL(rfkill_force_state);
static ssize_t rfkill_name_show(struct device *dev,
struct device_attribute *attr,
return sprintf(buf, "%s\n", rfkill->name);
}
-static ssize_t rfkill_type_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
+static const char *rfkill_get_type_str(enum rfkill_type type)
{
- struct rfkill *rfkill = to_rfkill(dev);
- const char *type;
-
- switch (rfkill->type) {
+ switch (type) {
case RFKILL_TYPE_WLAN:
- type = "wlan";
- break;
+ return "wlan";
case RFKILL_TYPE_BLUETOOTH:
- type = "bluetooth";
- break;
+ return "bluetooth";
case RFKILL_TYPE_UWB:
- type = "ultrawideband";
- break;
+ return "ultrawideband";
+ case RFKILL_TYPE_WIMAX:
+ return "wimax";
+ case RFKILL_TYPE_WWAN:
+ return "wwan";
default:
BUG();
}
+}
- return sprintf(buf, "%s\n", type);
+static ssize_t rfkill_type_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct rfkill *rfkill = to_rfkill(dev);
+
+ return sprintf(buf, "%s\n", rfkill_get_type_str(rfkill->type));
}
static ssize_t rfkill_state_show(struct device *dev,
{
struct rfkill *rfkill = to_rfkill(dev);
+ update_rfkill_state(rfkill);
return sprintf(buf, "%d\n", rfkill->state);
}
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 = rfkill_toggle_radio(rfkill,
- state ? RFKILL_STATE_ON : RFKILL_STATE_OFF);
+ error = strict_strtoul(buf, 0, &state);
if (error)
return error;
- return count;
+ /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
+ if (state != RFKILL_STATE_UNBLOCKED &&
+ state != RFKILL_STATE_SOFT_BLOCKED)
+ return -EINVAL;
+
+ 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;
}
static ssize_t rfkill_claim_show(struct device *dev,
{
struct rfkill *rfkill = to_rfkill(dev);
- return sprintf(buf, "%d", rfkill->user_claim);
+ return sprintf(buf, "%d\n", rfkill->user_claim);
}
static ssize_t rfkill_claim_store(struct device *dev,
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))
return -EPERM;
+ 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_unsupported) {
- error = -EOPNOTSUPP;
- goto out_unlock;
- }
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]);
+ rfkill_global_states[rfkill->type].current_state,
+ 0);
+ mutex_unlock(&rfkill->mutex);
+ }
rfkill->user_claim = claim;
}
-out_unlock:
- 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_SUSPEND) {
- mutex_lock(&rfkill->mutex);
-
- if (rfkill->state == RFKILL_STATE_ON)
- rfkill->toggle_radio(rfkill->data,
- RFKILL_STATE_OFF);
-
- 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;
}
if (dev->power.power_state.event != PM_EVENT_ON) {
mutex_lock(&rfkill->mutex);
- if (rfkill->state == RFKILL_STATE_ON)
- rfkill->toggle_radio(rfkill->data, RFKILL_STATE_ON);
+ dev->power.power_state.event = PM_EVENT_ON;
+
+ /*
+ * 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);
}
- dev->power.power_state = PMSG_ON;
return 0;
}
#else
#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);
+ int error;
+
+ error = add_uevent_var(env, "RFKILL_NAME=%s", rfkill->name);
+ if (error)
+ return error;
+ error = add_uevent_var(env, "RFKILL_TYPE=%s",
+ rfkill_get_type_str(rfkill->type));
+ if (error)
+ return error;
+ error = add_uevent_var(env, "RFKILL_STATE=%d", rfkill->state);
+ return error;
+}
+
static struct class rfkill_class = {
.name = "rfkill",
.dev_release = rfkill_release,
.dev_attrs = rfkill_dev_attrs,
.suspend = rfkill_suspend,
.resume = rfkill_resume,
+ .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)
{
int error;
- mutex_lock(&rfkill_mutex);
+ mutex_lock(&rfkill_global_mutex);
- error = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]);
- if (!error)
- list_add_tail(&rfkill->node, &rfkill_list);
+ 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;
+ }
- mutex_unlock(&rfkill_mutex);
+ rfkill_toggle_radio(rfkill,
+ rfkill_global_states[rfkill->type].current_state,
+ 0);
+
+ list_add_tail(&rfkill->node, &rfkill_list);
+
+ error = 0;
+unlock_out:
+ mutex_unlock(&rfkill_global_mutex);
return error;
}
static void rfkill_remove_switch(struct rfkill *rfkill)
{
- mutex_lock(&rfkill_mutex);
+ mutex_lock(&rfkill_global_mutex);
list_del_init(&rfkill->node);
- rfkill_toggle_radio(rfkill, RFKILL_STATE_OFF);
- mutex_unlock(&rfkill_mutex);
+ mutex_unlock(&rfkill_global_mutex);
+
+ mutex_lock(&rfkill->mutex);
+ rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
+ mutex_unlock(&rfkill->mutex);
}
/**
* @type: type of the switch (RFKILL_TYPE_*)
*
* This function should be called by the network driver when it needs
- * rfkill structure. Once the structure is allocated the driver shoud
- * finish its initialization by setting name, private data, enable_radio
+ * rfkill structure. Once the structure is allocated the driver should
+ * finish its initialization by setting the name, private data, enable_radio
* and disable_radio methods and then register it with rfkill_register().
+ *
* 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;
* rfkill_free - Mark rfkill structure for deletion
* @rfkill: rfkill structure to be destroyed
*
- * Decrements reference count of rfkill structure so it is destoryed.
+ * Decrements reference count of the rfkill structure so it is destroyed.
* Note that rfkill_free() should _not_ be called after rfkill_unregister().
*/
void rfkill_free(struct rfkill *rfkill)
#ifdef CONFIG_RFKILL_LEDS
int error;
- rfkill->led_trigger.name = rfkill->dev.bus_id;
+ if (!rfkill->led_trigger.name)
+ 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);
if (error)
rfkill->led_trigger.name = NULL;
static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
{
#ifdef CONFIG_RFKILL_LEDS
- if (rfkill->led_trigger.name)
+ if (rfkill->led_trigger.name) {
led_trigger_unregister(&rfkill->led_trigger);
+ rfkill->led_trigger.name = NULL;
+ }
#endif
}
* 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);
error = rfkill_add_switch(rfkill);
- if (error)
+ if (error) {
+ rfkill_led_trigger_unregister(rfkill);
return error;
+ }
error = device_add(dev);
if (error) {
rfkill_remove_switch(rfkill);
+ rfkill_led_trigger_unregister(rfkill);
return error;
}
EXPORT_SYMBOL(rfkill_register);
/**
- * rfkill_unregister - Uegister a rfkill structure.
+ * rfkill_unregister - Unregister a rfkill structure.
* @rfkill: rfkill structure to be unregistered
*
* This function should be called by the network driver during device
*/
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.
*/
int error;
int i;
- for (i = 0; i < ARRAY_SIZE(rfkill_states); i++)
- rfkill_states[i] = RFKILL_STATE_ON;
+ /* RFKILL_STATE_HARD_BLOCKED is illegal here... */
+ if (rfkill_default_state != RFKILL_STATE_SOFT_BLOCKED &&
+ rfkill_default_state != RFKILL_STATE_UNBLOCKED)
+ return -EINVAL;
+
+ 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);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff