![Henrique de Moraes Holschuh](/assets/img/avatar_default.png)
Every time a new input device that is capable of one of the rfkill EV_SW events (currently only SW_RFKILL_ALL) is connected to rfkill-input, we must check the states of the input EV_SW switches and take action. Otherwise, we will ignore the initial switch state. We also need to re-check the states of the EV_SW switches after a device that was under an exclusive grab is released back to us, since we got no input events from that device while it was grabbed. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Acked-by: Ivo van Doorn <IvDoorn@gmail.com> Cc: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: John W. Linville <linville@tuxdriver.com>
269 lines
6.6 KiB
C
269 lines
6.6 KiB
C
/*
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* Input layer to RF Kill interface connector
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*
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* Copyright (c) 2007 Dmitry Torokhov
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/init.h>
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#include <linux/rfkill.h>
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#include "rfkill-input.h"
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MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
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MODULE_DESCRIPTION("Input layer to RF switch connector");
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MODULE_LICENSE("GPL");
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struct rfkill_task {
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struct work_struct work;
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enum rfkill_type type;
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struct mutex mutex; /* ensures that task is serialized */
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spinlock_t lock; /* for accessing last and desired state */
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unsigned long last; /* last schedule */
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enum rfkill_state desired_state; /* on/off */
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};
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static void rfkill_task_handler(struct work_struct *work)
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{
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struct rfkill_task *task = container_of(work, struct rfkill_task, work);
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mutex_lock(&task->mutex);
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rfkill_switch_all(task->type, task->desired_state);
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mutex_unlock(&task->mutex);
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}
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static void rfkill_task_epo_handler(struct work_struct *work)
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{
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rfkill_epo();
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}
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static DECLARE_WORK(epo_work, rfkill_task_epo_handler);
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static void rfkill_schedule_epo(void)
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{
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schedule_work(&epo_work);
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}
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static void rfkill_schedule_set(struct rfkill_task *task,
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enum rfkill_state desired_state)
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{
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unsigned long flags;
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if (unlikely(work_pending(&epo_work)))
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return;
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spin_lock_irqsave(&task->lock, flags);
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if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
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task->desired_state = desired_state;
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task->last = jiffies;
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schedule_work(&task->work);
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}
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spin_unlock_irqrestore(&task->lock, flags);
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}
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static void rfkill_schedule_toggle(struct rfkill_task *task)
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{
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unsigned long flags;
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if (unlikely(work_pending(&epo_work)))
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return;
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spin_lock_irqsave(&task->lock, flags);
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if (time_after(jiffies, task->last + msecs_to_jiffies(200))) {
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task->desired_state =
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rfkill_state_complement(task->desired_state);
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task->last = jiffies;
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schedule_work(&task->work);
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}
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spin_unlock_irqrestore(&task->lock, flags);
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}
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#define DEFINE_RFKILL_TASK(n, t) \
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struct rfkill_task n = { \
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.work = __WORK_INITIALIZER(n.work, \
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rfkill_task_handler), \
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.type = t, \
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.mutex = __MUTEX_INITIALIZER(n.mutex), \
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.lock = __SPIN_LOCK_UNLOCKED(n.lock), \
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.desired_state = RFKILL_STATE_UNBLOCKED, \
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}
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static DEFINE_RFKILL_TASK(rfkill_wlan, RFKILL_TYPE_WLAN);
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static DEFINE_RFKILL_TASK(rfkill_bt, RFKILL_TYPE_BLUETOOTH);
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static DEFINE_RFKILL_TASK(rfkill_uwb, RFKILL_TYPE_UWB);
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static DEFINE_RFKILL_TASK(rfkill_wimax, RFKILL_TYPE_WIMAX);
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static DEFINE_RFKILL_TASK(rfkill_wwan, RFKILL_TYPE_WWAN);
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static void rfkill_schedule_evsw_rfkillall(int state)
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{
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/* EVERY radio type. state != 0 means radios ON */
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/* handle EPO (emergency power off) through shortcut */
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if (state) {
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rfkill_schedule_set(&rfkill_wwan,
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RFKILL_STATE_UNBLOCKED);
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rfkill_schedule_set(&rfkill_wimax,
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RFKILL_STATE_UNBLOCKED);
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rfkill_schedule_set(&rfkill_uwb,
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RFKILL_STATE_UNBLOCKED);
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rfkill_schedule_set(&rfkill_bt,
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RFKILL_STATE_UNBLOCKED);
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rfkill_schedule_set(&rfkill_wlan,
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RFKILL_STATE_UNBLOCKED);
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} else
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rfkill_schedule_epo();
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}
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static void rfkill_event(struct input_handle *handle, unsigned int type,
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unsigned int code, int data)
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{
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if (type == EV_KEY && data == 1) {
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switch (code) {
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case KEY_WLAN:
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rfkill_schedule_toggle(&rfkill_wlan);
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break;
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case KEY_BLUETOOTH:
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rfkill_schedule_toggle(&rfkill_bt);
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break;
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case KEY_UWB:
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rfkill_schedule_toggle(&rfkill_uwb);
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break;
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case KEY_WIMAX:
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rfkill_schedule_toggle(&rfkill_wimax);
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break;
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default:
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break;
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}
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} else if (type == EV_SW) {
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switch (code) {
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case SW_RFKILL_ALL:
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rfkill_schedule_evsw_rfkillall(data);
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break;
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default:
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break;
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}
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}
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}
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static int rfkill_connect(struct input_handler *handler, struct input_dev *dev,
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const struct input_device_id *id)
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{
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struct input_handle *handle;
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int error;
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handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
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if (!handle)
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return -ENOMEM;
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handle->dev = dev;
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handle->handler = handler;
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handle->name = "rfkill";
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/* causes rfkill_start() to be called */
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error = input_register_handle(handle);
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if (error)
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goto err_free_handle;
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error = input_open_device(handle);
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if (error)
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goto err_unregister_handle;
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return 0;
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err_unregister_handle:
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input_unregister_handle(handle);
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err_free_handle:
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kfree(handle);
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return error;
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}
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static void rfkill_start(struct input_handle *handle)
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{
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/* Take event_lock to guard against configuration changes, we
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* should be able to deal with concurrency with rfkill_event()
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* just fine (which event_lock will also avoid). */
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spin_lock_irq(&handle->dev->event_lock);
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if (test_bit(EV_SW, handle->dev->evbit)) {
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if (test_bit(SW_RFKILL_ALL, handle->dev->swbit))
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rfkill_schedule_evsw_rfkillall(test_bit(SW_RFKILL_ALL,
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handle->dev->sw));
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/* add resync for further EV_SW events here */
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}
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spin_unlock_irq(&handle->dev->event_lock);
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}
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static void rfkill_disconnect(struct input_handle *handle)
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{
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input_close_device(handle);
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input_unregister_handle(handle);
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kfree(handle);
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}
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static const struct input_device_id rfkill_ids[] = {
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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.keybit = { [BIT_WORD(KEY_WLAN)] = BIT_MASK(KEY_WLAN) },
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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.keybit = { [BIT_WORD(KEY_BLUETOOTH)] = BIT_MASK(KEY_BLUETOOTH) },
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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.keybit = { [BIT_WORD(KEY_UWB)] = BIT_MASK(KEY_UWB) },
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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.keybit = { [BIT_WORD(KEY_WIMAX)] = BIT_MASK(KEY_WIMAX) },
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},
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_SWBIT,
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.evbit = { BIT(EV_SW) },
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.swbit = { [BIT_WORD(SW_RFKILL_ALL)] = BIT_MASK(SW_RFKILL_ALL) },
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},
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{ }
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};
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static struct input_handler rfkill_handler = {
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.event = rfkill_event,
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.connect = rfkill_connect,
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.disconnect = rfkill_disconnect,
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.start = rfkill_start,
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.name = "rfkill",
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.id_table = rfkill_ids,
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};
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static int __init rfkill_handler_init(void)
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{
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return input_register_handler(&rfkill_handler);
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}
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static void __exit rfkill_handler_exit(void)
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{
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input_unregister_handler(&rfkill_handler);
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flush_scheduled_work();
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}
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module_init(rfkill_handler_init);
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module_exit(rfkill_handler_exit);
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