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/* drivers/input/keyreset.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/keyreset.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/keycombo.h>
struct keyreset_state {
int restart_requested;
int (*reset_fn)(void);
struct platform_device *pdev_child;
struct work_struct restart_work;
};
static void do_restart(struct work_struct *unused)
{
orderly_reboot();
}
static void do_reset_fn(void *priv)
{
struct keyreset_state *state = priv;
if (state->restart_requested)
panic("keyboard reset failed, %d", state->restart_requested);
if (state->reset_fn) {
state->restart_requested = state->reset_fn();
} else {
pr_info("keyboard reset\n");
schedule_work(&state->restart_work);
state->restart_requested = 1;
}
}
static int keyreset_probe(struct platform_device *pdev)
{
int ret = -ENOMEM;
struct keycombo_platform_data *pdata_child;
struct keyreset_platform_data *pdata = pdev->dev.platform_data;
int up_size = 0, down_size = 0, size;
int key, *keyp;
struct keyreset_state *state;
if (!pdata)
return -EINVAL;
state = devm_kzalloc(&pdev->dev, sizeof(*state), GFP_KERNEL);
if (!state)
return -ENOMEM;
state->pdev_child = platform_device_alloc(KEYCOMBO_NAME,
PLATFORM_DEVID_AUTO);
if (!state->pdev_child)
return -ENOMEM;
state->pdev_child->dev.parent = &pdev->dev;
INIT_WORK(&state->restart_work, do_restart);
keyp = pdata->keys_down;
while ((key = *keyp++)) {
if (key >= KEY_MAX)
continue;
down_size++;
}
if (pdata->keys_up) {
keyp = pdata->keys_up;
while ((key = *keyp++)) {
if (key >= KEY_MAX)
continue;
up_size++;
}
}
size = sizeof(struct keycombo_platform_data)
+ sizeof(int) * (down_size + 1);
pdata_child = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
if (!pdata_child)
goto error;
memcpy(pdata_child->keys_down, pdata->keys_down,
sizeof(int) * down_size);
if (up_size > 0) {
pdata_child->keys_up = devm_kzalloc(&pdev->dev, up_size + 1,
GFP_KERNEL);
if (!pdata_child->keys_up)
goto error;
memcpy(pdata_child->keys_up, pdata->keys_up,
sizeof(int) * up_size);
if (!pdata_child->keys_up)
goto error;
}
state->reset_fn = pdata->reset_fn;
pdata_child->key_down_fn = do_reset_fn;
pdata_child->priv = state;
pdata_child->key_down_delay = pdata->key_down_delay;
ret = platform_device_add_data(state->pdev_child, pdata_child, size);
if (ret)
goto error;
platform_set_drvdata(pdev, state);
return platform_device_add(state->pdev_child);
error:
platform_device_put(state->pdev_child);
return ret;
}
int keyreset_remove(struct platform_device *pdev)
{
struct keyreset_state *state = platform_get_drvdata(pdev);
platform_device_put(state->pdev_child);
return 0;
}
struct platform_driver keyreset_driver = {
.driver.name = KEYRESET_NAME,
.probe = keyreset_probe,
.remove = keyreset_remove,
};
static int __init keyreset_init(void)
{
return platform_driver_register(&keyreset_driver);
}
static void __exit keyreset_exit(void)
{
return platform_driver_unregister(&keyreset_driver);
}
module_init(keyreset_init);
module_exit(keyreset_exit);
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