mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2025-11-04 06:54:27 -05:00
314 lines
8.2 KiB
Diff
314 lines
8.2 KiB
Diff
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 */
|