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/* drivers/tty/smux_debug.c
*
* Copyright (c) 2012, The Linux Foundation. All rights reserved.
*
* 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/debugfs.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/completion.h>
#include <linux/termios.h>
#include <linux/smux.h>
#include "smux_private.h"
#define DEBUG_BUFMAX 4096
/**
* smux_dump_ch() - Dumps the information of a channel to the screen.
* @buf: Buffer for status message.
* @max: Size of status queue.
* @lch_number: Number of the logical channel.
* @lch: Pointer to the lch_number'th instance of struct smux_lch_t.
*
*/
static int smux_dump_ch(char *buf, int max, struct smux_lch_t *lch)
{
int bytes_written;
long tiocm_bits;
unsigned long flags;
spin_lock_irqsave(&lch->state_lock_lhb1, flags);
spin_lock(&lch->tx_lock_lhb2);
tiocm_bits = msm_smux_tiocm_get_atomic(lch);
bytes_written = scnprintf(
buf, max,
"ch%02d: "
"%s(%s) "
"%c%c%c%c%c "
"%d "
"%s(%s) "
"%c%c\n",
lch->lcid,
local_lch_state(lch->local_state), lch_mode(lch->local_mode),
(tiocm_bits & TIOCM_DSR) ? 'D' : 'd',
(tiocm_bits & TIOCM_CTS) ? 'T' : 't',
(tiocm_bits & TIOCM_RI) ? 'I' : 'i',
(tiocm_bits & TIOCM_CD) ? 'C' : 'c',
lch->tx_flow_control ? 'F' : 'f',
lch->tx_pending_data_cnt,
remote_lch_state(lch->remote_state), lch_mode(lch->remote_mode),
(tiocm_bits & TIOCM_DTR) ? 'R' : 'r',
(tiocm_bits & TIOCM_RTS) ? 'S' : 's'
);
spin_unlock(&lch->tx_lock_lhb2);
spin_unlock_irqrestore(&lch->state_lock_lhb1, flags);
return bytes_written;
}
/**
* smux_dump_format_ch() - Informs user of format for channel dump
* @buf: Buffer for status message.
* @max: Size of status queue.
*
*/
static int smux_dump_format_ch(char *buf, int max)
{
return scnprintf(
buf, max,
"ch_id "
"local state(mode) tiocm "
"tx_queue "
"remote state(mode) tiocm\n"
"local tiocm: DSR(D) CTS(T) RI(I) DCD(C) FLOW_CONTROL(F)\n"
"remote tiocm: DTR(R) RTS(S)\n"
"A capital letter indicates set, otherwise, it is not set.\n\n"
);
}
/**
* smux_debug_ch() - Log following information about each channel
* local open, local mode, remote open, remote mode,
* tiocm bits, flow control state and transmit queue size.
* Returns the number of bytes written to buf.
* @buf Buffer for status message
* @max Size of status queue
*
*/
static int smux_debug_ch(char *buf, int max)
{
int ch_id;
int bytes_written = smux_dump_format_ch(buf, max);
for (ch_id = 0; ch_id < SMUX_NUM_LOGICAL_CHANNELS; ch_id++) {
bytes_written += smux_dump_ch(buf + bytes_written,
max - bytes_written,
&smux_lch[ch_id]);
}
return bytes_written;
}
static char debug_buffer[DEBUG_BUFMAX];
static ssize_t debug_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
int (*fill)(char *buf, int max) = file->private_data;
int bsize;
if (*ppos != 0)
return 0;
bsize = fill(debug_buffer, DEBUG_BUFMAX);
return simple_read_from_buffer(buf, count, ppos, debug_buffer, bsize);
}
static int debug_open(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
static const struct file_operations debug_ops = {
.read = debug_read,
.open = debug_open,
};
static void debug_create(const char *name, mode_t mode,
struct dentry *dent,
int (*fill)(char *buf, int max))
{
debugfs_create_file(name, mode, dent, fill, &debug_ops);
}
static int __init smux_debugfs_init(void)
{
struct dentry *dent;
dent = debugfs_create_dir("n_smux", 0);
if (IS_ERR(dent))
return PTR_ERR(dent);
debug_create("ch", 0444, dent, smux_debug_ch);
return 0;
}
late_initcall(smux_debugfs_init);
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