Maemo patchset 20101501+0m5

[h-e-n] / drivers / misc / panic_info_buff.c

diff --git a/drivers/misc/panic_info_buff.c b/drivers/misc/panic_info_buff.c
new file mode 100644 (file)
index 0000000..d28965a
--- /dev/null
+++ b/drivers/misc/panic_info_buff.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) Nokia Corporation
+ *
+ * Contact: Atal Shargorodsky <ext-atal.shargorodsky@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/uaccess.h>
+#include <linux/debugfs.h>
+#include <linux/notifier.h>
+
+#define PANIC_BUFFER_MAX_LEN  1024
+static char panic_info_buff[PANIC_BUFFER_MAX_LEN];
+static struct dentry *panic_info_buff_debugfs;
+
+static int panic_info_buff_open(struct inode *inode, struct file *file)
+{
+       return 0;
+}
+
+static ssize_t panic_info_buff_write(struct file *file,
+               const char __user *buf, size_t len, loff_t *off)
+{
+       if (len >= PANIC_BUFFER_MAX_LEN)
+               return -EINVAL;
+       if (copy_from_user(panic_info_buff, buf, len))
+               return -EFAULT;
+       panic_info_buff[len] = '\0';
+       return len;
+}
+
+static struct file_operations panic_info_buff_fops = {
+       .open   = panic_info_buff_open,
+       .write  = panic_info_buff_write,
+       .llseek = no_llseek,
+       .owner  = THIS_MODULE,
+};
+
+static int panic_info_buff_event(struct notifier_block *this,
+       unsigned long event, void *ptr)
+{
+       if (panic_info_buff[0] == '\0') {
+               printk(KERN_EMERG "Panic info buffer is empty.\n");
+       } else {
+               printk(KERN_EMERG "Panic info buffer:\n");
+               printk(KERN_EMERG "%s\n", panic_info_buff);
+       }
+       return NOTIFY_OK;
+}
+
+static struct notifier_block panic_info_buff_block = {
+       .notifier_call  = panic_info_buff_event,
+       .priority       = 1,
+};
+
+static int __devinit panic_info_buff_init(void)
+{
+       panic_info_buff_debugfs = debugfs_create_file("panic_info_buff",
+               S_IFREG | S_IWUSR | S_IWGRP,
+               NULL, NULL, &panic_info_buff_fops);
+       atomic_notifier_chain_register(&panic_notifier_list,
+               &panic_info_buff_block);
+       return 0;
+}
+module_init(panic_info_buff_init);
+
+static void __devexit panic_info_buff_exit(void)
+{
+       debugfs_remove(panic_info_buff_debugfs);
+       atomic_notifier_chain_unregister(&panic_notifier_list,
+               &panic_info_buff_block);
+
+}
+module_exit(panic_info_buff_exit);
+
+MODULE_AUTHOR("Nokia Corporation");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("panic_info_buff");