From 79399a8d1908f6a406e82d23c5a9937e1722ed3a Mon Sep 17 00:00:00 2001 From: Henrique de Moraes Holschuh Date: Mon, 23 Jun 2008 17:23:03 -0300 Subject: [PATCH] rfkill: add notifier chains support Add a notifier chain for use by the rfkill class. This notifier chain signals the following events (more to be added when needed): 1. rfkill: rfkill device state has changed A pointer to the rfkill struct will be passed as a parameter. The notifier message types have been added to include/linux/rfkill.h instead of to include/linux/notifier.h in order to avoid the madness of modifying a header used globally (and that triggers an almost full tree rebuild every time it is touched) with information that is of interest only to code that includes the rfkill.h header. Signed-off-by: Henrique de Moraes Holschuh Acked-by: Ivo van Doorn Signed-off-by: John W. Linville --- include/linux/rfkill.h | 7 +++++ net/rfkill/rfkill.c | 70 ++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 74 insertions(+), 3 deletions(-) diff --git a/include/linux/rfkill.h b/include/linux/rfkill.h index c0cab7d37828..98667becdee4 100644 --- a/include/linux/rfkill.h +++ b/include/linux/rfkill.h @@ -117,4 +117,11 @@ static inline char *rfkill_get_led_name(struct rfkill *rfkill) #endif } +/* rfkill notification chain */ +#define RFKILL_STATE_CHANGED 0x0001 /* state of a normal rfkill + switch has changed */ + +int register_rfkill_notifier(struct notifier_block *nb); +int unregister_rfkill_notifier(struct notifier_block *nb); + #endif /* RFKILL_H */ diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c index fb566902030a..a561e350a70a 100644 --- a/net/rfkill/rfkill.c +++ b/net/rfkill/rfkill.c @@ -46,6 +46,49 @@ MODULE_PARM_DESC(default_state, 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); + +/** + * 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 void rfkill_led_trigger(struct rfkill *rfkill, enum rfkill_state state) @@ -62,14 +105,25 @@ static void rfkill_led_trigger(struct rfkill *rfkill, #endif /* CONFIG_RFKILL_LEDS */ } +static void notify_rfkill_state_change(struct rfkill *rfkill) +{ + blocking_notifier_call_chain(&rfkill_notifier_list, + RFKILL_STATE_CHANGED, + rfkill); +} + static void update_rfkill_state(struct rfkill *rfkill) { - enum rfkill_state newstate; + enum rfkill_state newstate, oldstate; if (rfkill->get_state) { mutex_lock(&rfkill->mutex); - if (!rfkill->get_state(rfkill->data, &newstate)) + 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); } } @@ -93,8 +147,10 @@ static int rfkill_toggle_radio(struct rfkill *rfkill, rfkill->state = state; } - if (force || rfkill->state != oldstate) + if (force || rfkill->state != oldstate) { rfkill_led_trigger(rfkill, rfkill->state); + notify_rfkill_state_change(rfkill); + } return retval; } @@ -139,12 +195,20 @@ EXPORT_SYMBOL(rfkill_switch_all); */ int rfkill_force_state(struct rfkill *rfkill, enum rfkill_state state) { + enum rfkill_state oldstate; + if (state != RFKILL_STATE_OFF && state != RFKILL_STATE_ON) 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; -- 2.30.2