314 lines
8.2 KiB
Diff
314 lines
8.2 KiB
Diff
From eb92150c047e76960ecf8989b9037fd34b43a4af Mon Sep 17 00:00:00 2001
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From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
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Date: Fri, 21 Nov 2008 21:47:23 -0800
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Subject: [PATCH 090/134] input: Add keyreset driver.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=utf-8
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Content-Transfer-Encoding: 8bit
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Add a platform device in the board file to specify a reset key-combo.
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The first time the key-combo is detected a work function that syncs
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the filesystems is scheduled. If all the keys are released and then
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pressed again, it calls panic. Reboot on panic should be set for
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this to work.
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Signed-off-by: Arve Hjønnevåg <arve@android.com>
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---
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drivers/input/Kconfig | 9 ++
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drivers/input/Makefile | 1 +
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drivers/input/keyreset.c | 229 ++++++++++++++++++++++++++++++++++++++++++++++
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include/linux/keyreset.h | 27 ++++++
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4 files changed, 266 insertions(+), 0 deletions(-)
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create mode 100644 drivers/input/keyreset.c
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create mode 100644 include/linux/keyreset.h
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--- a/drivers/input/Kconfig
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+++ b/drivers/input/Kconfig
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@@ -149,6 +149,15 @@ config INPUT_APMPOWER
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To compile this driver as a module, choose M here: the
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module will be called apm-power.
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+config INPUT_KEYRESET
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+ tristate "Reset key"
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+ depends on INPUT
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+ ---help---
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+ Say Y here if you want to reboot when some keys are pressed;
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+
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+ To compile this driver as a module, choose M here: the
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+ module will be called keyreset.
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+
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config XEN_KBDDEV_FRONTEND
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tristate "Xen virtual keyboard and mouse support"
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depends on XEN_FBDEV_FRONTEND
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--- a/drivers/input/Makefile
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+++ b/drivers/input/Makefile
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@@ -23,5 +23,6 @@ obj-$(CONFIG_INPUT_TOUCHSCREEN) += touch
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obj-$(CONFIG_INPUT_MISC) += misc/
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obj-$(CONFIG_INPUT_APMPOWER) += apm-power.o
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+obj-$(CONFIG_INPUT_KEYRESET) += keyreset.o
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obj-$(CONFIG_XEN_KBDDEV_FRONTEND) += xen-kbdfront.o
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--- /dev/null
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+++ b/drivers/input/keyreset.c
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@@ -0,0 +1,229 @@
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+/* drivers/input/keyreset.c
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+ *
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+ * Copyright (C) 2008 Google, Inc.
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+ *
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+ * This software is licensed under the terms of the GNU General Public
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+ * License version 2, as published by the Free Software Foundation, and
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+ * may be copied, distributed, and modified under those terms.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ */
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+
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+#include <linux/input.h>
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+#include <linux/keyreset.h>
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/reboot.h>
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+#include <linux/sched.h>
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+#include <linux/syscalls.h>
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+
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+
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+struct keyreset_state {
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+ struct input_handler input_handler;
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+ unsigned long keybit[BITS_TO_LONGS(KEY_CNT)];
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+ unsigned long upbit[BITS_TO_LONGS(KEY_CNT)];
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+ unsigned long key[BITS_TO_LONGS(KEY_CNT)];
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+ spinlock_t lock;
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+ int key_down_target;
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+ int key_down;
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+ int key_up;
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+ int restart_disabled;
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+};
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+
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+int restart_requested;
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+static void deferred_restart(struct work_struct *dummy)
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+{
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+ restart_requested = 2;
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+ sys_sync();
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+ restart_requested = 3;
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+ kernel_restart(NULL);
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+}
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+static DECLARE_WORK(restart_work, deferred_restart);
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+
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+static void keyreset_event(struct input_handle *handle, unsigned int type,
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+ unsigned int code, int value)
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+{
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+ unsigned long flags;
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+ struct keyreset_state *state = handle->private;
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+
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+ if (type != EV_KEY)
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+ return;
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+
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+ if (code >= KEY_MAX)
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+ return;
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+
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+ if (!test_bit(code, state->keybit))
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+ return;
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+
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+ spin_lock_irqsave(&state->lock, flags);
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+ if (!test_bit(code, state->key) == !value)
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+ goto done;
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+ __change_bit(code, state->key);
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+ if (test_bit(code, state->upbit)) {
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+ if (value) {
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+ state->restart_disabled = 1;
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+ state->key_up++;
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+ } else
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+ state->key_up--;
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+ } else {
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+ if (value)
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+ state->key_down++;
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+ else
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+ state->key_down--;
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+ }
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+ if (state->key_down == 0 && state->key_up == 0)
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+ state->restart_disabled = 0;
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+
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+ pr_debug("reset key changed %d %d new state %d-%d-%d\n", code, value,
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+ state->key_down, state->key_up, state->restart_disabled);
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+
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+ if (value && !state->restart_disabled &&
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+ state->key_down == state->key_down_target) {
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+ state->restart_disabled = 1;
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+ if (restart_requested)
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+ panic("keyboard reset failed, %d", restart_requested);
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+ pr_info("keyboard reset\n");
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+ schedule_work(&restart_work);
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+ restart_requested = 1;
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+ }
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+done:
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+ spin_unlock_irqrestore(&state->lock, flags);
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+}
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+
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+static int keyreset_connect(struct input_handler *handler,
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+ struct input_dev *dev,
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+ const struct input_device_id *id)
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+{
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+ int i;
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+ int ret;
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+ struct input_handle *handle;
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+ struct keyreset_state *state =
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+ container_of(handler, struct keyreset_state, input_handler);
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+
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+ for (i = 0; i < KEY_MAX; i++) {
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+ if (test_bit(i, state->keybit) && test_bit(i, dev->keybit))
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+ break;
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+ }
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+ if (i == KEY_MAX)
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+ return -ENODEV;
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+
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+ handle = kzalloc(sizeof(*handle), GFP_KERNEL);
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+ if (!handle)
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+ return -ENOMEM;
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+
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+ handle->dev = dev;
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+ handle->handler = handler;
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+ handle->name = "keyreset";
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+ handle->private = state;
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+
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+ ret = input_register_handle(handle);
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+ if (ret)
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+ goto err_input_register_handle;
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+
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+ ret = input_open_device(handle);
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+ if (ret)
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+ goto err_input_open_device;
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+
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+ pr_info("using input dev %s for key reset\n", dev->name);
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+
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+ return 0;
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+
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+err_input_open_device:
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+ input_unregister_handle(handle);
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+err_input_register_handle:
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+ kfree(handle);
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+ return ret;
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+}
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+
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+static void keyreset_disconnect(struct input_handle *handle)
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+{
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+ input_close_device(handle);
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+ input_unregister_handle(handle);
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+ kfree(handle);
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+}
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+
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+static const struct input_device_id keyreset_ids[] = {
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+ {
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+ .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
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+ .evbit = { BIT_MASK(EV_KEY) },
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+ },
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+ { },
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+};
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+MODULE_DEVICE_TABLE(input, keyreset_ids);
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+
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+static int keyreset_probe(struct platform_device *pdev)
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+{
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+ int ret;
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+ int key, *keyp;
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+ struct keyreset_state *state;
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+ struct keyreset_platform_data *pdata = pdev->dev.platform_data;
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+
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+ if (!pdata)
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+ return -EINVAL;
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+
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+ state = kzalloc(sizeof(*state), GFP_KERNEL);
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+ if (!state)
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+ return -ENOMEM;
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+
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+ spin_lock_init(&state->lock);
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+ keyp = pdata->keys_down;
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+ while ((key = *keyp++)) {
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+ if (key >= KEY_MAX)
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+ continue;
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+ state->key_down_target++;
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+ __set_bit(key, state->keybit);
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+ }
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+ if (pdata->keys_up) {
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+ keyp = pdata->keys_up;
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+ while ((key = *keyp++)) {
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+ if (key >= KEY_MAX)
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+ continue;
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+ __set_bit(key, state->keybit);
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+ __set_bit(key, state->upbit);
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+ }
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+ }
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+ state->input_handler.event = keyreset_event;
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+ state->input_handler.connect = keyreset_connect;
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+ state->input_handler.disconnect = keyreset_disconnect;
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+ state->input_handler.name = KEYRESET_NAME;
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+ state->input_handler.id_table = keyreset_ids;
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+ ret = input_register_handler(&state->input_handler);
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+ if (ret) {
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+ kfree(state);
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+ return ret;
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+ }
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+ platform_set_drvdata(pdev, state);
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+ return 0;
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+}
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+
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+int keyreset_remove(struct platform_device *pdev)
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+{
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+ struct keyreset_state *state = platform_get_drvdata(pdev);
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+ input_unregister_handler(&state->input_handler);
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+ kfree(state);
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+ return 0;
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+}
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+
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+
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+struct platform_driver keyreset_driver = {
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+ .driver.name = KEYRESET_NAME,
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+ .probe = keyreset_probe,
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+ .remove = keyreset_remove,
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+};
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+
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+static int __init keyreset_init(void)
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+{
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+ return platform_driver_register(&keyreset_driver);
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+}
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+
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+static void __exit keyreset_exit(void)
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+{
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+ return platform_driver_unregister(&keyreset_driver);
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+}
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+
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+module_init(keyreset_init);
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+module_exit(keyreset_exit);
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--- /dev/null
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+++ b/include/linux/keyreset.h
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@@ -0,0 +1,27 @@
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+/*
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+ * include/linux/keyreset.h - platform data structure for resetkeys driver
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+ *
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+ * Copyright (C) 2008 Google, Inc.
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+ *
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+ * This software is licensed under the terms of the GNU General Public
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+ * License version 2, as published by the Free Software Foundation, and
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+ * may be copied, distributed, and modified under those terms.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ */
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+
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+#ifndef _LINUX_KEYRESET_H
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+#define _LINUX_KEYRESET_H
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+
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+#define KEYRESET_NAME "keyreset"
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+
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+struct keyreset_platform_data {
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+ int *keys_up;
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+ int keys_down[]; /* 0 terminated */
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+};
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+
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+#endif /* _LINUX_KEYRESET_H */
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