--- /dev/null
+From eb92150c047e76960ecf8989b9037fd34b43a4af Mon Sep 17 00:00:00 2001
+From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
+Date: Fri, 21 Nov 2008 21:47:23 -0800
+Subject: [PATCH 090/134] input: Add keyreset driver.
+MIME-Version: 1.0
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: 8bit
+
+Add a platform device in the board file to specify a reset key-combo.
+The first time the key-combo is detected a work function that syncs
+the filesystems is scheduled. If all the keys are released and then
+pressed again, it calls panic. Reboot on panic should be set for
+this to work.
+
+Signed-off-by: Arve Hjønnevåg <arve@android.com>
+---
+ drivers/input/Kconfig | 9 ++
+ drivers/input/Makefile | 1 +
+ drivers/input/keyreset.c | 229 ++++++++++++++++++++++++++++++++++++++++++++++
+ include/linux/keyreset.h | 27 ++++++
+ 4 files changed, 266 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/input/keyreset.c
+ create mode 100644 include/linux/keyreset.h
+
+--- a/drivers/input/Kconfig
++++ b/drivers/input/Kconfig
+@@ -149,6 +149,15 @@ config INPUT_APMPOWER
+ To compile this driver as a module, choose M here: the
+ module will be called apm-power.
+
++config INPUT_KEYRESET
++ tristate "Reset key"
++ depends on INPUT
++ ---help---
++ Say Y here if you want to reboot when some keys are pressed;
++
++ To compile this driver as a module, choose M here: the
++ module will be called keyreset.
++
+ config XEN_KBDDEV_FRONTEND
+ tristate "Xen virtual keyboard and mouse support"
+ depends on XEN_FBDEV_FRONTEND
+--- a/drivers/input/Makefile
++++ b/drivers/input/Makefile
+@@ -23,5 +23,6 @@ obj-$(CONFIG_INPUT_TOUCHSCREEN) += touch
+ obj-$(CONFIG_INPUT_MISC) += misc/
+
+ obj-$(CONFIG_INPUT_APMPOWER) += apm-power.o
++obj-$(CONFIG_INPUT_KEYRESET) += keyreset.o
+
+ obj-$(CONFIG_XEN_KBDDEV_FRONTEND) += xen-kbdfront.o
+--- /dev/null
++++ b/drivers/input/keyreset.c
+@@ -0,0 +1,229 @@
++/* 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);
+--- /dev/null
++++ b/include/linux/keyreset.h
+@@ -0,0 +1,27 @@
++/*
++ * include/linux/keyreset.h - platform data structure for resetkeys driver
++ *
++ * 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.
++ *
++ */
++
++#ifndef _LINUX_KEYRESET_H
++#define _LINUX_KEYRESET_H
++
++#define KEYRESET_NAME "keyreset"
++
++struct keyreset_platform_data {
++ int *keys_up;
++ int keys_down[]; /* 0 terminated */
++};
++
++#endif /* _LINUX_KEYRESET_H */
projects / openwrt / openwrt.git / blobdiff