1 files changed, 174 insertions, 0 deletions

diff --git a/net/rfkill/rfkill-input.c b/net/rfkill/rfkill-input.c
new file mode 100644
index 000000000000..e5c840c30284
--- /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);