[NET]: rfkill: add support for input key to control wireless radio
The RF kill patch that provides infrastructure for implementing
switches controlling radio states on various network and other cards.
[dtor@insightbb.com: address review comments]
[akpm@linux-foundation.org: cleanups, build fixes]
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/Kconfig b/net/Kconfig
index 5b22278..caeacd1 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -225,6 +225,8 @@
endmenu
+source "net/rfkill/Kconfig"
+
endif # if NET
endmenu # Networking
diff --git a/net/Makefile b/net/Makefile
index 9fdb60c..34e5b2d 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -51,6 +51,7 @@
obj-$(CONFIG_TIPC) += tipc/
obj-$(CONFIG_NETLABEL) += netlabel/
obj-$(CONFIG_IUCV) += iucv/
+obj-$(CONFIG_RFKILL) += rfkill/
ifeq ($(CONFIG_NET),y)
obj-$(CONFIG_SYSCTL) += sysctl_net.o
diff --git a/net/rfkill/Kconfig b/net/rfkill/Kconfig
new file mode 100644
index 0000000..8b31759
--- /dev/null
+++ b/net/rfkill/Kconfig
@@ -0,0 +1,24 @@
+#
+# 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, Bluetooth and IRDA 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.
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..e5c840c
--- /dev/null
+++ b/net/rfkill/rfkill-input.c
@@ -0,0 +1,174 @@
+/*
+ * 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>
+
+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 */
+ enum rfkill_state current_state; /* on/off */
+};
+
+static void rfkill_task_handler(struct work_struct *work)
+{
+ struct rfkill_task *task = container_of(work, struct rfkill_task, work);
+ enum rfkill_state state;
+
+ mutex_lock(&task->mutex);
+
+ /*
+ * Use temp variable to fetch desired state to keep it
+ * consistent even if rfkill_schedule_toggle() runs in
+ * another thread or interrupts us.
+ */
+ state = task->desired_state;
+
+ if (state != task->current_state) {
+ rfkill_switch_all(task->type, state);
+ task->current_state = state;
+ }
+
+ mutex_unlock(&task->mutex);
+}
+
+static void rfkill_schedule_toggle(struct rfkill_task *task)
+{
+ unsigned int flags;
+
+ spin_lock_irqsave(&task->lock, flags);
+
+ if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
+ task->desired_state = !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_ON, \
+ .current_state = RFKILL_STATE_ON, \
+ }
+
+static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);
+static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH);
+
+static void rfkill_event(struct input_handle *handle, unsigned int type,
+ unsigned int code, int down)
+{
+ if (type == EV_KEY && down == 1) {
+ switch (code) {
+ case KEY_WLAN:
+ rfkill_schedule_toggle(&rfkill_wlan);
+ break;
+ case KEY_BLUETOOTH:
+ rfkill_schedule_toggle(&rfkill_bt);
+ 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";
+
+ 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_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(EV_KEY) },
+ .keybit = { [LONG(KEY_WLAN)] = BIT(KEY_WLAN) },
+ },
+ {
+ .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
+ .evbit = { BIT(EV_KEY) },
+ .keybit = { [LONG(KEY_BLUETOOTH)] = BIT(KEY_BLUETOOTH) },
+ },
+ { }
+};
+
+static struct input_handler rfkill_handler = {
+ .event = rfkill_event,
+ .connect = rfkill_connect,
+ .disconnect = rfkill_disconnect,
+ .name = "rfkill",
+ .id_table = rfkill_ids,
+};
+
+static int __init rfkill_handler_init(void)
+{
+ 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.c b/net/rfkill/rfkill.c
new file mode 100644
index 0000000..a973603
--- /dev/null
+++ b/net/rfkill/rfkill.c
@@ -0,0 +1,407 @@
+/*
+ * Copyright (C) 2006 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>
+
+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 enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
+
+static int rfkill_toggle_radio(struct rfkill *rfkill,
+ enum rfkill_state state)
+{
+ int retval;
+
+ retval = mutex_lock_interruptible(&rfkill->mutex);
+ if (retval)
+ return retval;
+
+ if (state != rfkill->state) {
+ retval = rfkill->toggle_radio(rfkill->data, state);
+ if (!retval)
+ rfkill->state = state;
+ }
+
+ mutex_unlock(&rfkill->mutex);
+ return retval;
+}
+
+/**
+ * rfkill_switch_all - Toggle state of all switches of given type
+ * @type: type of interfaces to be affeceted
+ * @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.
+ */
+
+void rfkill_switch_all(enum rfkill_type type, enum rfkill_state state)
+{
+ struct rfkill *rfkill;
+
+ mutex_lock(&rfkill_mutex);
+
+ rfkill_states[type] = state;
+
+ list_for_each_entry(rfkill, &rfkill_list, node) {
+ if (!rfkill->user_claim)
+ rfkill_toggle_radio(rfkill, state);
+ }
+
+ mutex_unlock(&rfkill_mutex);
+}
+EXPORT_SYMBOL(rfkill_switch_all);
+
+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 ssize_t rfkill_type_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct rfkill *rfkill = to_rfkill(dev);
+ const char *type;
+
+ switch (rfkill->type) {
+ case RFKILL_TYPE_WLAN:
+ type = "wlan";
+ break;
+ case RFKILL_TYPE_BLUETOOTH:
+ type = "bluetooth";
+ break;
+ case RFKILL_TYPE_IRDA:
+ type = "irda";
+ break;
+ default:
+ BUG();
+ }
+
+ return sprintf(buf, "%s\n", type);
+}
+
+static ssize_t rfkill_state_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct rfkill *rfkill = to_rfkill(dev);
+
+ 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 int state = simple_strtoul(buf, NULL, 0);
+ int error;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ error = rfkill_toggle_radio(rfkill,
+ state ? RFKILL_STATE_ON : RFKILL_STATE_OFF);
+ if (error)
+ return error;
+
+ return 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", 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);
+ bool claim = !!simple_strtoul(buf, NULL, 0);
+ int error;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ /*
+ * Take the global lock to make sure the kernel is not in
+ * the middle of rfkill_switch_all
+ */
+ error = mutex_lock_interruptible(&rfkill_mutex);
+ if (error)
+ return error;
+
+ if (rfkill->user_claim != claim) {
+ if (!claim)
+ rfkill_toggle_radio(rfkill,
+ rfkill_states[rfkill->type]);
+ rfkill->user_claim = claim;
+ }
+
+ mutex_unlock(&rfkill_mutex);
+
+ return 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, 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);
+
+ 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);
+ }
+
+ 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);
+
+ if (rfkill->state == RFKILL_STATE_ON)
+ rfkill->toggle_radio(rfkill->data, RFKILL_STATE_ON);
+
+ mutex_unlock(&rfkill->mutex);
+ }
+
+ dev->power.power_state = PMSG_ON;
+ return 0;
+}
+#else
+#define rfkill_suspend NULL
+#define rfkill_resume NULL
+#endif
+
+static struct class rfkill_class = {
+ .name = "rfkill",
+ .dev_release = rfkill_release,
+ .dev_attrs = rfkill_dev_attrs,
+ .suspend = rfkill_suspend,
+ .resume = rfkill_resume,
+};
+
+static int rfkill_add_switch(struct rfkill *rfkill)
+{
+ int retval;
+
+ retval = mutex_lock_interruptible(&rfkill_mutex);
+ if (retval)
+ return retval;
+
+ retval = rfkill_toggle_radio(rfkill, rfkill_states[rfkill->type]);
+ if (retval)
+ goto out;
+
+ list_add_tail(&rfkill->node, &rfkill_list);
+
+ out:
+ mutex_unlock(&rfkill_mutex);
+ return retval;
+}
+
+static void rfkill_remove_switch(struct rfkill *rfkill)
+{
+ mutex_lock(&rfkill_mutex);
+ list_del_init(&rfkill->node);
+ rfkill_toggle_radio(rfkill, RFKILL_STATE_OFF);
+ mutex_unlock(&rfkill_mutex);
+}
+
+/**
+ * rfkill_allocate - allocate memory for rfkill structure.
+ * @parent: device that has rf switch on it
+ * @type: type of the switch (wlan, bluetooth, irda)
+ *
+ * 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
+ * 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 *rfkill;
+ struct device *dev;
+
+ 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 rfkill structure so it is destoryed.
+ * 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);
+
+/**
+ * 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 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;
+
+ error = rfkill_add_switch(rfkill);
+ if (error)
+ return error;
+
+ snprintf(dev->bus_id, sizeof(dev->bus_id),
+ "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
+
+ error = device_add(dev);
+ if (error) {
+ rfkill_remove_switch(rfkill);
+ return error;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(rfkill_register);
+
+/**
+ * rfkill_unregister - Uegister 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)
+{
+ device_del(&rfkill->dev);
+ rfkill_remove_switch(rfkill);
+ put_device(&rfkill->dev);
+}
+EXPORT_SYMBOL(rfkill_unregister);
+
+/*
+ * Rfkill module initialization/deinitialization.
+ */
+static int __init rfkill_init(void)
+{
+ int error;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(rfkill_states); i++)
+ rfkill_states[i] = RFKILL_STATE_ON;
+
+ 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);
+}
+
+module_init(rfkill_init);
+module_exit(rfkill_exit);