M7350/kernel/drivers/input/keycombo.c
2024-09-09 08:57:42 +00:00

262 lines
6.3 KiB
C

/* drivers/input/keycombo.c
*
* Copyright (C) 2014 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/input.h>
#include <linux/keycombo.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/sched.h>
#include <linux/slab.h>
struct keycombo_state {
struct input_handler input_handler;
unsigned long keybit[BITS_TO_LONGS(KEY_CNT)];
unsigned long upbit[BITS_TO_LONGS(KEY_CNT)];
unsigned long key[BITS_TO_LONGS(KEY_CNT)];
spinlock_t lock;
struct workqueue_struct *wq;
int key_down_target;
int key_down;
int key_up;
struct delayed_work key_down_work;
int delay;
struct work_struct key_up_work;
void (*key_up_fn)(void *);
void (*key_down_fn)(void *);
void *priv;
int key_is_down;
struct wakeup_source combo_held_wake_source;
struct wakeup_source combo_up_wake_source;
};
static void do_key_down(struct work_struct *work)
{
struct delayed_work *dwork = container_of(work, struct delayed_work,
work);
struct keycombo_state *state = container_of(dwork,
struct keycombo_state, key_down_work);
if (state->key_down_fn)
state->key_down_fn(state->priv);
}
static void do_key_up(struct work_struct *work)
{
struct keycombo_state *state = container_of(work, struct keycombo_state,
key_up_work);
if (state->key_up_fn)
state->key_up_fn(state->priv);
__pm_relax(&state->combo_up_wake_source);
}
static void keycombo_event(struct input_handle *handle, unsigned int type,
unsigned int code, int value)
{
unsigned long flags;
struct keycombo_state *state = handle->private;
if (type != EV_KEY)
return;
if (code >= KEY_MAX)
return;
if (!test_bit(code, state->keybit))
return;
spin_lock_irqsave(&state->lock, flags);
if (!test_bit(code, state->key) == !value)
goto done;
__change_bit(code, state->key);
if (test_bit(code, state->upbit)) {
if (value)
state->key_up++;
else
state->key_up--;
} else {
if (value)
state->key_down++;
else
state->key_down--;
}
if (state->key_down == state->key_down_target && state->key_up == 0) {
__pm_stay_awake(&state->combo_held_wake_source);
state->key_is_down = 1;
if (queue_delayed_work(state->wq, &state->key_down_work,
state->delay))
pr_debug("Key down work already queued!");
} else if (state->key_is_down) {
if (!cancel_delayed_work(&state->key_down_work)) {
__pm_stay_awake(&state->combo_up_wake_source);
queue_work(state->wq, &state->key_up_work);
}
__pm_relax(&state->combo_held_wake_source);
state->key_is_down = 0;
}
done:
spin_unlock_irqrestore(&state->lock, flags);
}
static int keycombo_connect(struct input_handler *handler,
struct input_dev *dev,
const struct input_device_id *id)
{
int i;
int ret;
struct input_handle *handle;
struct keycombo_state *state =
container_of(handler, struct keycombo_state, input_handler);
for (i = 0; i < KEY_MAX; i++) {
if (test_bit(i, state->keybit) && test_bit(i, dev->keybit))
break;
}
if (i == KEY_MAX)
return -ENODEV;
handle = kzalloc(sizeof(*handle), GFP_KERNEL);
if (!handle)
return -ENOMEM;
handle->dev = dev;
handle->handler = handler;
handle->name = KEYCOMBO_NAME;
handle->private = state;
ret = input_register_handle(handle);
if (ret)
goto err_input_register_handle;
ret = input_open_device(handle);
if (ret)
goto err_input_open_device;
return 0;
err_input_open_device:
input_unregister_handle(handle);
err_input_register_handle:
kfree(handle);
return ret;
}
static void keycombo_disconnect(struct input_handle *handle)
{
input_close_device(handle);
input_unregister_handle(handle);
kfree(handle);
}
static const struct input_device_id keycombo_ids[] = {
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
.evbit = { BIT_MASK(EV_KEY) },
},
{ },
};
MODULE_DEVICE_TABLE(input, keycombo_ids);
static int keycombo_probe(struct platform_device *pdev)
{
int ret;
int key, *keyp;
struct keycombo_state *state;
struct keycombo_platform_data *pdata = pdev->dev.platform_data;
if (!pdata)
return -EINVAL;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (!state)
return -ENOMEM;
spin_lock_init(&state->lock);
keyp = pdata->keys_down;
while ((key = *keyp++)) {
if (key >= KEY_MAX)
continue;
state->key_down_target++;
__set_bit(key, state->keybit);
}
if (pdata->keys_up) {
keyp = pdata->keys_up;
while ((key = *keyp++)) {
if (key >= KEY_MAX)
continue;
__set_bit(key, state->keybit);
__set_bit(key, state->upbit);
}
}
state->wq = alloc_ordered_workqueue("keycombo", 0);
if (!state->wq)
return -ENOMEM;
state->priv = pdata->priv;
if (pdata->key_down_fn)
state->key_down_fn = pdata->key_down_fn;
INIT_DELAYED_WORK(&state->key_down_work, do_key_down);
if (pdata->key_up_fn)
state->key_up_fn = pdata->key_up_fn;
INIT_WORK(&state->key_up_work, do_key_up);
wakeup_source_init(&state->combo_held_wake_source, "key combo");
wakeup_source_init(&state->combo_up_wake_source, "key combo up");
state->delay = msecs_to_jiffies(pdata->key_down_delay);
state->input_handler.event = keycombo_event;
state->input_handler.connect = keycombo_connect;
state->input_handler.disconnect = keycombo_disconnect;
state->input_handler.name = KEYCOMBO_NAME;
state->input_handler.id_table = keycombo_ids;
ret = input_register_handler(&state->input_handler);
if (ret) {
kfree(state);
return ret;
}
platform_set_drvdata(pdev, state);
return 0;
}
int keycombo_remove(struct platform_device *pdev)
{
struct keycombo_state *state = platform_get_drvdata(pdev);
input_unregister_handler(&state->input_handler);
destroy_workqueue(state->wq);
kfree(state);
return 0;
}
struct platform_driver keycombo_driver = {
.driver.name = KEYCOMBO_NAME,
.probe = keycombo_probe,
.remove = keycombo_remove,
};
static int __init keycombo_init(void)
{
return platform_driver_register(&keycombo_driver);
}
static void __exit keycombo_exit(void)
{
return platform_driver_unregister(&keycombo_driver);
}
module_init(keycombo_init);
module_exit(keycombo_exit);