+++ /dev/null
-/* drivers/input/keyreset.c
- *
- * Copyright (C) 2008 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/syscalls.h>
-
-
-struct keyreset_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;
- int key_down_target;
- int key_down;
- int key_up;
- int restart_disabled;
-};
-
-int restart_requested;
-static void deferred_restart(struct work_struct *dummy)
-{
- restart_requested = 2;
- sys_sync();
- restart_requested = 3;
- kernel_restart(NULL);
-}
-static DECLARE_WORK(restart_work, deferred_restart);
-
-static void keyreset_event(struct input_handle *handle, unsigned int type,
- unsigned int code, int value)
-{
- unsigned long flags;
- struct keyreset_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->restart_disabled = 1;
- state->key_up++;
- } else
- state->key_up--;
- } else {
- if (value)
- state->key_down++;
- else
- state->key_down--;
- }
- if (state->key_down == 0 && state->key_up == 0)
- state->restart_disabled = 0;
-
- pr_debug("reset key changed %d %d new state %d-%d-%d\n", code, value,
- state->key_down, state->key_up, state->restart_disabled);
-
- if (value && !state->restart_disabled &&
- state->key_down == state->key_down_target) {
- state->restart_disabled = 1;
- if (restart_requested)
- panic("keyboard reset failed, %d", restart_requested);
- pr_info("keyboard reset\n");
- schedule_work(&restart_work);
- restart_requested = 1;
- }
-done:
- spin_unlock_irqrestore(&state->lock, flags);
-}
-
-static int keyreset_connect(struct input_handler *handler,
- struct input_dev *dev,
- const struct input_device_id *id)
-{
- int i;
- int ret;
- struct input_handle *handle;
- struct keyreset_state *state =
- container_of(handler, struct keyreset_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 = "keyreset";
- 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;
-
- pr_info("using input dev %s for key reset\n", dev->name);
-
- return 0;
-
-err_input_open_device:
- input_unregister_handle(handle);
-err_input_register_handle:
- kfree(handle);
- return ret;
-}
-
-static void keyreset_disconnect(struct input_handle *handle)
-{
- input_close_device(handle);
- input_unregister_handle(handle);
- kfree(handle);
-}
-
-static const struct input_device_id keyreset_ids[] = {
- {
- .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
- .evbit = { BIT_MASK(EV_KEY) },
- },
- { },
-};
-MODULE_DEVICE_TABLE(input, keyreset_ids);
-
-static int keyreset_probe(struct platform_device *pdev)
-{
- int ret;
- int key, *keyp;
- struct keyreset_state *state;
- struct keyreset_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->input_handler.event = keyreset_event;
- state->input_handler.connect = keyreset_connect;
- state->input_handler.disconnect = keyreset_disconnect;
- state->input_handler.name = KEYRESET_NAME;
- state->input_handler.id_table = keyreset_ids;
- ret = input_register_handler(&state->input_handler);
- if (ret) {
- kfree(state);
- return ret;
- }
- platform_set_drvdata(pdev, state);
- return 0;
-}
-
-int keyreset_remove(struct platform_device *pdev)
-{
- struct keyreset_state *state = platform_get_drvdata(pdev);
- input_unregister_handler(&state->input_handler);
- kfree(state);
- 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);
projects / firefly-linux-kernel-4.4.55.git / commitdiff