+++ /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 */
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