staging: batman-adv meshing protocol

B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is
a routing protocol for multi-hop ad-hoc mesh networks. The
networks may be wired or wireless. See
http://www.open-mesh.org/ for more information and user space
tools.

This is the first submission for inclusion in staging.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 179 insertions, 0 deletions

diff --git a/drivers/staging/batman-adv/log.c b/drivers/staging/batman-adv/log.c
new file mode 100644
index 000000000000..f37c7f01a9f5
--- /dev/null
+++ b/drivers/staging/batman-adv/log.c
@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "log.h"
+
+#define LOG_BUF_MASK (log_buf_len-1)
+#define LOG_BUF(idx) (log_buf[(idx) & LOG_BUF_MASK])
+
+static char log_buf[LOG_BUF_LEN];
+static int log_buf_len = LOG_BUF_LEN;
+static unsigned long log_start;
+static unsigned long log_end;
+uint8_t log_level;
+
+static DEFINE_SPINLOCK(logbuf_lock);
+
+const struct file_operations proc_log_operations = {
+	.open           = log_open,
+	.release        = log_release,
+	.read           = log_read,
+	.write          = log_write,
+	.poll           = log_poll,
+};
+
+static DECLARE_WAIT_QUEUE_HEAD(log_wait);
+
+static void emit_log_char(char c)
+{
+	LOG_BUF(log_end) = c;
+	log_end++;
+
+	if (log_end - log_start > log_buf_len)
+		log_start = log_end - log_buf_len;
+}
+
+static int fdebug_log(char *fmt, ...)
+{
+	int printed_len;
+	char *p;
+	va_list args;
+	static char debug_log_buf[256];
+	unsigned long flags;
+
+	spin_lock_irqsave(&logbuf_lock, flags);
+	va_start(args, fmt);
+	printed_len = vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt,
+				 args);
+	va_end(args);
+
+	for (p = debug_log_buf; *p != 0; p++)
+		emit_log_char(*p);
+
+	spin_unlock_irqrestore(&logbuf_lock, flags);
+
+	wake_up(&log_wait);
+
+	return 0;
+}
+
+int debug_log(int type, char *fmt, ...)
+{
+	va_list args;
+	int retval = 0;
+	char tmp_log_buf[256];
+
+	/* only critical information get into the official kernel log */
+	if (type == LOG_TYPE_CRIT) {
+		va_start(args, fmt);
+		vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
+		printk(KERN_ERR "batman-adv: %s", tmp_log_buf);
+		va_end(args);
+	}
+
+	if ((type == LOG_TYPE_CRIT) || (log_level & type)) {
+		va_start(args, fmt);
+		vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
+		fdebug_log("[%10u] %s", (jiffies / HZ), tmp_log_buf);
+		va_end(args);
+	}
+
+	return retval;
+}
+
+int log_open(struct inode *inode, struct file *file)
+{
+	inc_module_count();
+	return 0;
+}
+
+int log_release(struct inode *inode, struct file *file)
+{
+	dec_module_count();
+	return 0;
+}
+
+ssize_t log_read(struct file *file, char __user *buf, size_t count,
+		 loff_t *ppos)
+{
+	int error, i = 0;
+	char c;
+	unsigned long flags;
+
+	if ((file->f_flags & O_NONBLOCK) && !(log_end - log_start))
+		return -EAGAIN;
+
+	if ((!buf) || (count < 0))
+		return -EINVAL;
+
+	if (count == 0)
+		return 0;
+
+	if (!access_ok(VERIFY_WRITE, buf, count))
+		return -EFAULT;
+
+	error = wait_event_interruptible(log_wait, (log_start - log_end));
+
+	if (error)
+		return error;
+
+	spin_lock_irqsave(&logbuf_lock, flags);
+
+	while ((!error) && (log_start != log_end) && (i < count)) {
+		c = LOG_BUF(log_start);
+
+		log_start++;
+
+		spin_unlock_irqrestore(&logbuf_lock, flags);
+
+		error = __put_user(c, buf);
+
+		spin_lock_irqsave(&logbuf_lock, flags);
+
+		buf++;
+		i++;
+
+	}
+
+	spin_unlock_irqrestore(&logbuf_lock, flags);
+
+	if (!error)
+		return i;
+
+	return error;
+}
+
+ssize_t log_write(struct file *file, const char __user *buf, size_t count,
+		  loff_t *ppos)
+{
+	return count;
+}
+
+unsigned int log_poll(struct file *file, poll_table *wait)
+{
+	poll_wait(file, &log_wait, wait);
+
+	if (log_end - log_start)
+		return POLLIN | POLLRDNORM;
+
+	return 0;
+}