[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/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);