Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

5 files changed, 1208 insertions, 0 deletions

diff --git a/net/rfkill/Kconfig b/net/rfkill/Kconfig
new file mode 100644
index 0000000..7f807b3
--- /dev/null
+++ b/net/rfkill/Kconfig
@@ -0,0 +1,31 @@
+#
+# RF switch subsystem configuration
+#
+menuconfig RFKILL
+	tristate "RF switch subsystem support"
+	help
+	  Say Y here if you want to have control over RF switches
+	  found on many WiFi and Bluetooth cards.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called rfkill.
+
+config RFKILL_INPUT
+	tristate "Input layer to RF switch connector"
+	depends on RFKILL && INPUT
+	help
+	  Say Y here if you want kernel automatically toggle state
+	  of RF switches on and off when user presses appropriate
+	  button or a key on the keyboard. Without this module you
+	  need a some kind of userspace application to control
+	  state of the switches.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called rfkill-input.
+
+# LED trigger support
+config RFKILL_LEDS
+	bool
+	depends on RFKILL && LEDS_TRIGGERS
+	default y
+
diff --git a/net/rfkill/Makefile b/net/rfkill/Makefile
new file mode 100644
index 0000000..b38c430
--- /dev/null
+++ b/net/rfkill/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for the RF switch subsystem.
+#
+
+obj-$(CONFIG_RFKILL)			+= rfkill.o
+obj-$(CONFIG_RFKILL_INPUT)		+= rfkill-input.o
diff --git a/net/rfkill/rfkill-input.c b/net/rfkill/rfkill-input.c
new file mode 100644
index 0000000..bfdade7
--- /dev/null
+++ b/net/rfkill/rfkill-input.c
@@ -0,0 +1,274 @@
+/*
+ * Input layer to RF Kill interface connector
+ *
+ * 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 version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/init.h>
+#include <linux/rfkill.h>
+#include <linux/sched.h>
+
+#include "rfkill-input.h"
+
+MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
+MODULE_DESCRIPTION("Input layer to RF switch connector");
+MODULE_LICENSE("GPL");
+
+struct rfkill_task {
+	struct work_struct work;
+	enum rfkill_type type;
+	struct mutex mutex; /* ensures that task is serialized */
+	spinlock_t lock; /* for accessing last and desired state */
+	unsigned long last; /* last schedule */
+	enum rfkill_state desired_state; /* on/off */
+};
+
+static void rfkill_task_handler(struct work_struct *work)
+{
+	struct rfkill_task *task = container_of(work, struct rfkill_task, work);
+
+	mutex_lock(&task->mutex);
+
+	rfkill_switch_all(task->type, task->desired_state);
+
+	mutex_unlock(&task->mutex);
+}
+
+static void rfkill_task_epo_handler(struct work_struct *work)
+{
+	rfkill_epo();
+}
+
+static DECLARE_WORK(epo_work, rfkill_task_epo_handler);
+
+static void rfkill_schedule_epo(void)
+{
+	schedule_work(&epo_work);
+}
+
+static void rfkill_schedule_set(struct rfkill_task *task,
+				enum rfkill_state desired_state)
+{
+	unsigned long flags;
+
+	if (unlikely(work_pending(&epo_work)))
+		return;
+
+	spin_lock_irqsave(&task->lock, flags);
+
+	if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
+		task->desired_state = desired_state;
+		task->last = jiffies;
+		schedule_work(&task->work);
+	}
+
+	spin_unlock_irqrestore(&task->lock, flags);
+}
+
+static void rfkill_schedule_toggle(struct rfkill_task *task)
+{
+	unsigned long flags;
+
+	if (unlikely(work_pending(&epo_work)))
+		return;
+
+	spin_lock_irqsave(&task->lock, flags);
+
+	if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
+		task->desired_state =
+				rfkill_state_complement(task->desired_state);
+		task->last = jiffies;
+		schedule_work(&task->work);
+	}
+
+	spin_unlock_irqrestore(&task->lock, flags);
+}
+
+#define DEFINE_RFKILL_TASK(n, t)				\
+	struct rfkill_task n = {				\
+		.work = __WORK_INITIALIZER(n.work,		\
+				rfkill_task_handler),		\
+		.type = t,					\
+		.mutex = __MUTEX_INITIALIZER(n.mutex),		\
+		.lock = __SPIN_LOCK_UNLOCKED(n.lock),		\
+		.desired_state = RFKILL_STATE_UNBLOCKED,	\
+	}
+
+static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);
+static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH);
+static DEFINE_RFKILL_TASK(rfkill_uwb, RFKILL_TYPE_UWB);
+static DEFINE_RFKILL_TASK(rfkill_wimax, RFKILL_TYPE_WIMAX);
+static DEFINE_RFKILL_TASK(rfkill_wwan, RFKILL_TYPE_WWAN);
+
+static void rfkill_schedule_evsw_rfkillall(int state)
+{
+	/* EVERY radio type. state != 0 means radios ON */
+	/* handle EPO (emergency power off) through shortcut */
+	if (state) {
+		rfkill_schedule_set(&rfkill_wwan,
+				    RFKILL_STATE_UNBLOCKED);
+		rfkill_schedule_set(&rfkill_wimax,
+				    RFKILL_STATE_UNBLOCKED);
+		rfkill_schedule_set(&rfkill_uwb,
+				    RFKILL_STATE_UNBLOCKED);
+		rfkill_schedule_set(&rfkill_bt,
+				    RFKILL_STATE_UNBLOCKED);
+		rfkill_schedule_set(&rfkill_wlan,
+				    RFKILL_STATE_UNBLOCKED);
+	} else
+		rfkill_schedule_epo();
+}
+
+static void rfkill_event(struct input_handle *handle, unsigned int type,
+			unsigned int code, int data)
+{
+	if (type == EV_KEY && data == 1) {
+		switch (code) {
+		case KEY_WLAN:
+			rfkill_schedule_toggle(&rfkill_wlan);
+			break;
+		case KEY_BLUETOOTH:
+			rfkill_schedule_toggle(&rfkill_bt);
+			break;
+		case KEY_UWB:
+			rfkill_schedule_toggle(&rfkill_uwb);
+			break;
+		case KEY_WIMAX:
+			rfkill_schedule_toggle(&rfkill_wimax);
+			break;
+		default:
+			break;
+		}
+	} else if (type == EV_SW) {
+		switch (code) {
+		case SW_RFKILL_ALL:
+			rfkill_schedule_evsw_rfkillall(data);
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
+			  const struct input_device_id *id)
+{
+	struct input_handle *handle;
+	int error;
+
+	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
+	if (!handle)
+		return -ENOMEM;
+
+	handle->dev = dev;
+	handle->handler = handler;
+	handle->name = "rfkill";
+
+	/* causes rfkill_start() to be called */
+	error = input_register_handle(handle);
+	if (error)
+		goto err_free_handle;
+
+	error = input_open_device(handle);
+	if (error)
+		goto err_unregister_handle;
+
+	return 0;
+
+ err_unregister_handle:
+	input_unregister_handle(handle);
+ err_free_handle:
+	kfree(handle);
+	return error;
+}
+
+static void rfkill_start(struct input_handle *handle)
+{
+	/* Take event_lock to guard against configuration changes, we
+	 * should be able to deal with concurrency with rfkill_event()
+	 * just fine (which event_lock will also avoid). */
+	spin_lock_irq(&handle->dev->event_lock);
+
+	if (test_bit(EV_SW, handle->dev->evbit)) {
+		if (test_bit(SW_RFKILL_ALL, handle->dev->swbit))
+			rfkill_schedule_evsw_rfkillall(test_bit(SW_RFKILL_ALL,
+							handle->dev->sw));
+		/* add resync for further EV_SW events here */
+	}
+
+	spin_unlock_irq(&handle->dev->event_lock);
+}
+
+static void rfkill_disconnect(struct input_handle *handle)
+{
+	input_close_device(handle);
+	input_unregister_handle(handle);
+	kfree(handle);
+}
+
+static const struct input_device_id rfkill_ids[] = {
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
+	},
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
+	},
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
+	},
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
+		.evbit = { BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
+	},
+	{
+		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
+		.evbit = { BIT(EV_SW) },
+		.swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
+	},
+	{ }
+};
+
+static struct input_handler rfkill_handler = {
+	.event =	rfkill_event,
+	.connect =	rfkill_connect,
+	.disconnect =	rfkill_disconnect,
+	.start =	rfkill_start,
+	.name =		"rfkill",
+	.id_table =	rfkill_ids,
+};
+
+static int __init rfkill_handler_init(void)
+{
+	unsigned long last_run = jiffies - msecs_to_jiffies(500);
+	rfkill_wlan.last = last_run;
+	rfkill_bt.last = last_run;
+	rfkill_uwb.last = last_run;
+	rfkill_wimax.last = last_run;
+	return input_register_handler(&rfkill_handler);
+}
+
+static void __exit rfkill_handler_exit(void)
+{
+	input_unregister_handler(&rfkill_handler);
+	flush_scheduled_work();
+}
+
+module_init(rfkill_handler_init);
+module_exit(rfkill_handler_exit);
diff --git a/net/rfkill/rfkill-input.h b/net/rfkill/rfkill-input.h
new file mode 100644
index 0000000..bbfa646
--- /dev/null
+++ b/net/rfkill/rfkill-input.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2007 Ivo van Doorn
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#ifndef __RFKILL_INPUT_H
+#define __RFKILL_INPUT_H
+
+void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state);
+void rfkill_epo(void);
+void rfkill_restore_states(void);
+
+#endif /* __RFKILL_INPUT_H */
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
new file mode 100644
index 0000000..25ba3bd
--- /dev/null
+++ b/net/rfkill/rfkill.c
@@ -0,0 +1,879 @@
+/*
+ * 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 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,
+			       enum rfkill_state state)
+{
+#ifdef CONFIG_RFKILL_LEDS
+	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);
+#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,
+				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)
+		notify_rfkill_state_change(rfkill);
+
+	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->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.
+ */
+void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
+{
+	mutex_lock(&rfkill_global_mutex);
+	__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);
+
+	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);
+}
+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);
+
+	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_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,
+				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;
+
+	if (mutex_lock_interruptible(&rfkill->mutex))
+		return -ERESTARTSYS;
+	error = rfkill_toggle_radio(rfkill, state, 0);
+	mutex_unlock(&rfkill->mutex);
+
+	return error ? error : count;
+}
+
+static ssize_t rfkill_claim_show(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf)
+{
+	struct rfkill *rfkill = to_rfkill(dev);
+
+	return sprintf(buf, "%d\n", rfkill->user_claim);
+}
+
+static ssize_t rfkill_claim_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	struct rfkill *rfkill = to_rfkill(dev);
+	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_global_mutex);
+	if (error)
+		return error;
+
+	if (rfkill->user_claim != claim) {
+		if (!claim) {
+			mutex_lock(&rfkill->mutex);
+			rfkill_toggle_radio(rfkill,
+					rfkill_global_states[rfkill->type].current_state,
+					0);
+			mutex_unlock(&rfkill->mutex);
+		}
+		rfkill->user_claim = claim;
+	}
+
+	mutex_unlock(&rfkill_global_mutex);
+
+	return error ? error : count;
+}
+
+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)
+{
+	/* mark class device as suspended */
+	if (dev->power.power_state.event != state.event)
+		dev->power.power_state = state;
+
+	return 0;
+}
+
+static int rfkill_resume(struct device *dev)
+{
+	struct rfkill *rfkill = to_rfkill(dev);
+
+	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);
+
+		mutex_unlock(&rfkill->mutex);
+	}
+
+	return 0;
+}
+#else
+#define rfkill_suspend NULL
+#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_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 = 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;
+#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;
+
+	snprintf(dev->bus_id, sizeof(dev->bus_id),
+		 "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;
+		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;
+	}
+
+	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);
+}
+
+subsys_initcall(rfkill_init);
+module_exit(rfkill_exit);