rfkill: rewrite

This patch completely rewrites the rfkill core to address
the following deficiencies:

 * all rfkill drivers need to implement polling where necessary
   rather than having one central implementation

 * updating the rfkill state cannot be done from arbitrary
   contexts, forcing drivers to use schedule_work and requiring
   lots of code

 * rfkill drivers need to keep track of soft/hard blocked
   internally -- the core should do this

 * the rfkill API has many unexpected quirks, for example being
   asymmetric wrt. alloc/free and register/unregister

 * rfkill can call back into a driver from within a function the
   driver called -- this is prone to deadlocks and generally
   should be avoided

 * rfkill-input pointlessly is a separate module

 * drivers need to #ifdef rfkill functions (unless they want to
   depend on or select RFKILL) -- rfkill should provide inlines
   that do nothing if it isn't compiled in

 * the rfkill structure is not opaque -- drivers need to initialise
   it correctly (lots of sanity checking code required) -- instead
   force drivers to pass the right variables to rfkill_alloc()

 * the documentation is hard to read because it always assumes the
   reader is completely clueless and contains way TOO MANY CAPS

 * the rfkill code needlessly uses a lot of locks and atomic
   operations in locked sections

 * fix LED trigger to actually change the LED when the radio state
   changes -- this wasn't done before

Tested-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> [thinkpad]
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 0 insertions, 855 deletions

diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
deleted file mode 100644
index 4f5a83183c95..000000000000
--- a/net/rfkill/rfkill.c
+++ /dev/null
@@ -1,855 +0,0 @@
-/*
- * Copyright (C) 2006 - 2007 Ivo van Doorn
- * Copyright (C) 2007 Dmitry Torokhov
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the
- * Free Software Foundation, Inc.,
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/workqueue.h>
-#include <linux/capability.h>
-#include <linux/list.h>
-#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_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;
-
-
-#ifdef CONFIG_RFKILL_LEDS
-static void rfkill_led_trigger(struct rfkill *rfkill,
-			       enum rfkill_state state)
-{
-	struct led_trigger *led = &rfkill->led_trigger;
-
-	if (!led->name)
-		return;
-	if (state != RFKILL_STATE_UNBLOCKED)
-		led_trigger_event(led, LED_OFF);
-	else
-		led_trigger_event(led, LED_FULL);
-}
-
-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);
-}
-#else
-static inline void rfkill_led_trigger(struct rfkill *rfkill,
-					enum rfkill_state state)
-{
-}
-#endif /* CONFIG_RFKILL_LEDS */
-
-static void rfkill_uevent(struct rfkill *rfkill)
-{
-	kobject_uevent(&rfkill->dev.kobj, KOBJ_CHANGE);
-}
-
-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)
-				rfkill_uevent(rfkill);
-		}
-		mutex_unlock(&rfkill->mutex);
-	}
-	rfkill_led_trigger(rfkill, rfkill->state);
-}
-
-/**
- * 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,
-				int force)
-{
-	int retval = 0;
-	enum rfkill_state oldstate, newstate;
-
-	if (unlikely(rfkill->dev.power.power_state.event & PM_EVENT_SLEEP))
-		return -EBUSY;
-
-	oldstate = 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);
-		/* never allow a HARD->SOFT downgrade! */
-		if (!retval && rfkill->state != RFKILL_STATE_HARD_BLOCKED)
-			rfkill->state = state;
-	}
-
-	if (force || rfkill->state != oldstate)
-		rfkill_uevent(rfkill);
-
-	rfkill_led_trigger(rfkill, rfkill->state);
-	return retval;
-}
-
-/**
- * __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.
- */
-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->type == type) {
-			mutex_lock(&rfkill->mutex);
-			rfkill_toggle_radio(rfkill, state, 0);
-			mutex_unlock(&rfkill->mutex);
-			rfkill_led_trigger(rfkill, rfkill->state);
-		}
-	}
-}
-
-/**
- * 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_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_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);
-	}
-	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);
-	rfkill_led_trigger(rfkill, rfkill->state);
-}
-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.
- * @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)
-		rfkill_uevent(rfkill);
-
-	mutex_unlock(&rfkill->mutex);
-	rfkill_led_trigger(rfkill, rfkill->state);
-
-	return 0;
-}
-EXPORT_SYMBOL(rfkill_force_state);
-
-static ssize_t rfkill_name_show(struct device *dev,
-				struct device_attribute *attr,
-				char *buf)
-{
-	struct rfkill *rfkill = to_rfkill(dev);
-
-	return sprintf(buf, "%s\n", rfkill->name);
-}
-
-static const char *rfkill_get_type_str(enum rfkill_type type)
-{
-	switch (type) {
-	case RFKILL_TYPE_WLAN:
-		return "wlan";
-	case RFKILL_TYPE_BLUETOOTH:
-		return "bluetooth";
-	case RFKILL_TYPE_UWB:
-		return "ultrawideband";
-	case RFKILL_TYPE_WIMAX:
-		return "wimax";
-	case RFKILL_TYPE_WWAN:
-		return "wwan";
-	default:
-		BUG();
-	}
-}
-
-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 device_attribute *attr,
-				 char *buf)
-{
-	struct rfkill *rfkill = to_rfkill(dev);
-
-	update_rfkill_state(rfkill);
-	return sprintf(buf, "%d\n", rfkill->state);
-}
-
-static ssize_t rfkill_state_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf, size_t count)
-{
-	struct rfkill *rfkill = to_rfkill(dev);
-	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;
-
-	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 device_attribute *attr,
-				 char *buf)
-{
-	return sprintf(buf, "%d\n", 0);
-}
-
-static ssize_t rfkill_claim_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf, size_t count)
-{
-	return -EOPNOTSUPP;
-}
-
-static struct device_attribute rfkill_dev_attrs[] = {
-	__ATTR(name, S_IRUGO, rfkill_name_show, NULL),
-	__ATTR(type, S_IRUGO, rfkill_type_show, NULL),
-	__ATTR(state, S_IRUGO|S_IWUSR, rfkill_state_show, rfkill_state_store),
-	__ATTR(claim, S_IRUGO|S_IWUSR, rfkill_claim_show, rfkill_claim_store),
-	__ATTR_NULL
-};
-
-static void rfkill_release(struct device *dev)
-{
-	struct rfkill *rfkill = to_rfkill(dev);
-
-	kfree(rfkill);
-	module_put(THIS_MODULE);
-}
-
-#ifdef CONFIG_PM
-static int rfkill_suspend(struct device *dev, pm_message_t state)
-{
-	struct rfkill *rfkill = to_rfkill(dev);
-
-	/* 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;
-
-		/*
-		 * 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);
-		rfkill_led_trigger(rfkill, rfkill->state);
-	}
-
-	return 0;
-}
-#else
-#define rfkill_suspend NULL
-#define rfkill_resume NULL
-#endif
-
-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_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);
-
-	error = 0;
-unlock_out:
-	mutex_unlock(&rfkill_global_mutex);
-
-	return error;
-}
-
-static void rfkill_remove_switch(struct rfkill *rfkill)
-{
-	mutex_lock(&rfkill_global_mutex);
-	list_del_init(&rfkill->node);
-	mutex_unlock(&rfkill_global_mutex);
-
-	mutex_lock(&rfkill->mutex);
-	rfkill_toggle_radio(rfkill, RFKILL_STATE_SOFT_BLOCKED, 1);
-	mutex_unlock(&rfkill->mutex);
-}
-
-/**
- * rfkill_allocate - allocate memory for rfkill structure.
- * @parent: device that has rf switch on it
- * @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 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 * __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;
-
-	mutex_init(&rfkill->mutex);
-	INIT_LIST_HEAD(&rfkill->node);
-	rfkill->type = type;
-
-	dev = &rfkill->dev;
-	dev->class = &rfkill_class;
-	dev->parent = parent;
-	device_initialize(dev);
-
-	__module_get(THIS_MODULE);
-
-	return rfkill;
-}
-EXPORT_SYMBOL(rfkill_allocate);
-
-/**
- * rfkill_free - Mark rfkill structure for deletion
- * @rfkill: rfkill structure to be 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)
-{
-	if (rfkill)
-		put_device(&rfkill->dev);
-}
-EXPORT_SYMBOL(rfkill_free);
-
-static void rfkill_led_trigger_register(struct rfkill *rfkill)
-{
-#ifdef CONFIG_RFKILL_LEDS
-	int error;
-
-	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;
-#endif /* CONFIG_RFKILL_LEDS */
-}
-
-static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
-{
-#ifdef CONFIG_RFKILL_LEDS
-	if (rfkill->led_trigger.name) {
-		led_trigger_unregister(&rfkill->led_trigger);
-		rfkill->led_trigger.name = NULL;
-	}
-#endif
-}
-
-/**
- * rfkill_register - Register a rfkill structure.
- * @rfkill: rfkill structure to be registered
- *
- * This function should be called by the network driver when the rfkill
- * structure needs to be registered. Immediately from registration the
- * switch driver should be able to service calls to toggle_radio.
- */
-int __must_check rfkill_register(struct rfkill *rfkill)
-{
-	static atomic_t rfkill_no = ATOMIC_INIT(0);
-	struct device *dev = &rfkill->dev;
-	int error;
-
-	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;
-
-	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) {
-		rfkill_led_trigger_unregister(rfkill);
-		return error;
-	}
-
-	error = device_add(dev);
-	if (error) {
-		rfkill_remove_switch(rfkill);
-		rfkill_led_trigger_unregister(rfkill);
-		return error;
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL(rfkill_register);
-
-/**
- * rfkill_unregister - Unregister a rfkill structure.
- * @rfkill: rfkill structure to be unregistered
- *
- * This function should be called by the network driver during device
- * teardown to destroy rfkill structure. Note that rfkill_free() should
- * _not_ be called after rfkill_unregister().
- */
-void rfkill_unregister(struct rfkill *rfkill)
-{
-	BUG_ON(!rfkill);
-	device_del(&rfkill->dev);
-	rfkill_remove_switch(rfkill);
-	rfkill_led_trigger_unregister(rfkill);
-	put_device(&rfkill->dev);
-}
-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.
- */
-static int __init rfkill_init(void)
-{
-	int error;
-	int i;
-
-	/* 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) {
-		printk(KERN_ERR "rfkill: unable to register rfkill class\n");
-		return error;
-	}
-
-	return 0;
-}
-
-static void __exit rfkill_exit(void)
-{
-	class_unregister(&rfkill_class);
-}
-
-subsys_initcall(rfkill_init);
-module_exit(rfkill_exit);