1/*
2 * cfg80211 debugfs
3 *
4 * Copyright 2009	Luis R. Rodriguez <lrodriguez@atheros.com>
5 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/slab.h>
13#include "core.h"
14#include "debugfs.h"
15
16#define DEBUGFS_READONLY_FILE(name, buflen, fmt, value...)		\
17static ssize_t name## _read(struct file *file, char __user *userbuf,	\
18			    size_t count, loff_t *ppos)			\
19{									\
20	struct wiphy *wiphy= file->private_data;		\
21	char buf[buflen];						\
22	int res;							\
23									\
24	res = scnprintf(buf, buflen, fmt "\n", ##value);		\
25	return simple_read_from_buffer(userbuf, count, ppos, buf, res);	\
26}									\
27									\
28static const struct file_operations name## _ops = {			\
29	.read = name## _read,						\
30	.open = simple_open,						\
31	.llseek = generic_file_llseek,					\
32};
33
34DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
35		      wiphy->rts_threshold)
36DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
37		      wiphy->frag_threshold);
38DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
39		      wiphy->retry_short)
40DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
41		      wiphy->retry_long);
42
43static int ht_print_chan(struct ieee80211_channel *chan,
44			 char *buf, int buf_size, int offset)
45{
46	if (WARN_ON(offset > buf_size))
47		return 0;
48
49	if (chan->flags & IEEE80211_CHAN_DISABLED)
50		return scnprintf(buf + offset,
51				 buf_size - offset,
52				 "%d Disabled\n",
53				 chan->center_freq);
54
55	return scnprintf(buf + offset,
56			 buf_size - offset,
57			 "%d HT40 %c%c\n",
58			 chan->center_freq,
59			 (chan->flags & IEEE80211_CHAN_NO_HT40MINUS) ?
60				' ' : '-',
61			 (chan->flags & IEEE80211_CHAN_NO_HT40PLUS) ?
62				' ' : '+');
63}
64
65static ssize_t ht40allow_map_read(struct file *file,
66				  char __user *user_buf,
67				  size_t count, loff_t *ppos)
68{
69	struct wiphy *wiphy = file->private_data;
70	char *buf;
71	unsigned int offset = 0, buf_size = PAGE_SIZE, i, r;
72	enum ieee80211_band band;
73	struct ieee80211_supported_band *sband;
74
75	buf = kzalloc(buf_size, GFP_KERNEL);
76	if (!buf)
77		return -ENOMEM;
78
79	rtnl_lock();
80
81	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
82		sband = wiphy->bands[band];
83		if (!sband)
84			continue;
85		for (i = 0; i < sband->n_channels; i++)
86			offset += ht_print_chan(&sband->channels[i],
87						buf, buf_size, offset);
88	}
89
90	rtnl_unlock();
91
92	r = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
93
94	kfree(buf);
95
96	return r;
97}
98
99static const struct file_operations ht40allow_map_ops = {
100	.read = ht40allow_map_read,
101	.open = simple_open,
102	.llseek = default_llseek,
103};
104
105#define DEBUGFS_ADD(name)						\
106	debugfs_create_file(#name, S_IRUGO, phyd, &rdev->wiphy, &name## _ops);
107
108void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
109{
110	struct dentry *phyd = rdev->wiphy.debugfsdir;
111
112	DEBUGFS_ADD(rts_threshold);
113	DEBUGFS_ADD(fragmentation_threshold);
114	DEBUGFS_ADD(short_retry_limit);
115	DEBUGFS_ADD(long_retry_limit);
116	DEBUGFS_ADD(ht40allow_map);
117}
118