X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=net%2Frfkill%2Frfkill.c;h=d2d45655cd1a69582a8fdc2948c69c652ed0fd19;hb=ad619800e4e034cad44299b2a22df9eebb043ac3;hp=dd1c3f18f31d822d8e22eed7d30001bbceb3103c;hpb=ffb67c34e436fb163c4067936ccec797354fa6c6;p=linux-2.6 diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c index dd1c3f18f3..d2d45655cd 100644 --- a/net/rfkill/rfkill.c +++ b/net/rfkill/rfkill.c @@ -39,7 +39,7 @@ MODULE_LICENSE("GPL"); static LIST_HEAD(rfkill_list); /* list of registered rf switches */ static DEFINE_MUTEX(rfkill_mutex); -static unsigned int rfkill_default_state = RFKILL_STATE_ON; +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"); @@ -98,13 +98,23 @@ 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) { blocking_notifier_call_chain(&rfkill_notifier_list, @@ -128,6 +138,29 @@ static void update_rfkill_state(struct rfkill *rfkill) } } +/** + * 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. + * + * 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, int force) @@ -141,9 +174,28 @@ static int rfkill_toggle_radio(struct rfkill *rfkill, !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; + } + 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; } @@ -157,12 +209,12 @@ static int rfkill_toggle_radio(struct rfkill *rfkill, /** * rfkill_switch_all - Toggle state of all switches of given type - * @type: type of interfaces to be affeceted + * @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). */ void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state) { @@ -173,14 +225,37 @@ void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state) rfkill_states[type] = state; list_for_each_entry(rfkill, &rfkill_list, node) { - if ((!rfkill->user_claim) && (rfkill->type == type)) + if ((!rfkill->user_claim) && (rfkill->type == type)) { + mutex_lock(&rfkill->mutex); rfkill_toggle_radio(rfkill, state, 0); + mutex_unlock(&rfkill->mutex); + } } mutex_unlock(&rfkill_mutex); } EXPORT_SYMBOL(rfkill_switch_all); +/** + * rfkill_epo - emergency power off all transmitters + * + * This kicks all rfkill devices to RFKILL_STATE_SOFT_BLOCKED, ignoring + * everything in its path but rfkill_mutex and rfkill->mutex. + */ +void rfkill_epo(void) +{ + struct rfkill *rfkill; + + mutex_lock(&rfkill_mutex); + 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); +} +EXPORT_SYMBOL_GPL(rfkill_epo); + /** * rfkill_force_state - Force the internal rfkill radio state * @rfkill: pointer to the rfkill class to modify. @@ -191,14 +266,20 @@ EXPORT_SYMBOL(rfkill_switch_all); * a notification by the firmware/hardware of the current *real* * state of the radio rfkill switch. * - * It may not be called from an atomic context. + * 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; - if (state != RFKILL_STATE_OFF && - state != RFKILL_STATE_ON) + if (state != RFKILL_STATE_SOFT_BLOCKED && + state != RFKILL_STATE_UNBLOCKED && + state != RFKILL_STATE_HARD_BLOCKED) return -EINVAL; mutex_lock(&rfkill->mutex); @@ -272,11 +353,14 @@ static ssize_t rfkill_state_store(struct device *dev, if (!capable(CAP_NET_ADMIN)) return -EPERM; + /* 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 ? RFKILL_STATE_ON : RFKILL_STATE_OFF, - 0); + error = rfkill_toggle_radio(rfkill, state, 0); mutex_unlock(&rfkill->mutex); return error ? error : count; @@ -302,6 +386,9 @@ static ssize_t rfkill_claim_store(struct device *dev, if (!capable(CAP_NET_ADMIN)) return -EPERM; + if (rfkill->user_claim_unsupported) + return -EOPNOTSUPP; + /* * Take the global lock to make sure the kernel is not in * the middle of rfkill_switch_all @@ -310,19 +397,17 @@ static ssize_t rfkill_claim_store(struct device *dev, if (error) return error; - if (rfkill->user_claim_unsupported) { - error = -EOPNOTSUPP; - goto out_unlock; - } if (rfkill->user_claim != claim) { - if (!claim) + if (!claim) { + mutex_lock(&rfkill->mutex); rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type], 0); + mutex_unlock(&rfkill->mutex); + } rfkill->user_claim = claim; } -out_unlock: mutex_unlock(&rfkill_mutex); return error ? error : count; @@ -355,7 +440,8 @@ static int rfkill_suspend(struct device *dev, pm_message_t state) update_rfkill_state(rfkill); mutex_lock(&rfkill->mutex); - rfkill->toggle_radio(rfkill->data, RFKILL_STATE_OFF); + rfkill->toggle_radio(rfkill->data, + RFKILL_STATE_SOFT_BLOCKED); mutex_unlock(&rfkill->mutex); } @@ -435,25 +521,26 @@ static struct class rfkill_class = { static int rfkill_add_switch(struct rfkill *rfkill) { - int error; - mutex_lock(&rfkill_mutex); - error = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type], 0); - if (!error) - list_add_tail(&rfkill->node, &rfkill_list); + rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type], 0); + + list_add_tail(&rfkill->node, &rfkill_list); mutex_unlock(&rfkill_mutex); - return error; + return 0; } static void rfkill_remove_switch(struct rfkill *rfkill) { mutex_lock(&rfkill_mutex); list_del_init(&rfkill->node); - rfkill_toggle_radio(rfkill, RFKILL_STATE_OFF, 1); mutex_unlock(&rfkill_mutex); + + mutex_lock(&rfkill->mutex); + rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1); + mutex_unlock(&rfkill->mutex); } /** @@ -462,9 +549,10 @@ static void rfkill_remove_switch(struct rfkill *rfkill) * @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. */ @@ -496,7 +584,7 @@ EXPORT_SYMBOL(rfkill_allocate); * rfkill_free - Mark rfkill structure for deletion * @rfkill: rfkill structure to be destroyed * - * Decrements reference count of rfkill structure so it is destroyed. + * 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) @@ -511,7 +599,10 @@ static void rfkill_led_trigger_register(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 = rfkill->dev.bus_id; + 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; @@ -521,8 +612,10 @@ static void rfkill_led_trigger_register(struct rfkill *rfkill) 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 } @@ -558,8 +651,8 @@ int rfkill_register(struct rfkill *rfkill) error = device_add(dev); if (error) { - rfkill_led_trigger_unregister(rfkill); rfkill_remove_switch(rfkill); + rfkill_led_trigger_unregister(rfkill); return error; } @@ -592,8 +685,9 @@ static int __init rfkill_init(void) int error; int i; - if (rfkill_default_state != RFKILL_STATE_OFF && - rfkill_default_state != 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 < ARRAY_SIZE(rfkill_states); i++)