projects/linux·blob v3.2 · refs

121 lines · 3.2 KiB

1/*
2 * cfg80211 debugfs
3 *
4 * Copyright 2009 Luis R. Rodriguez <[email protected]>
5 * Copyright 2007 Johannes Berg <[email protected]>
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
16static int cfg80211_open_file_generic(struct inode *inode, struct file *file)
17{
18 file->private_data = inode->i_private;
19 return 0;
20}
21
22#define DEBUGFS_READONLY_FILE(name, buflen, fmt, value...) \
23static ssize_t name## _read(struct file *file, char __user *userbuf, \
24 size_t count, loff_t *ppos) \
25{ \
26 struct wiphy *wiphy= file->private_data; \
27 char buf[buflen]; \
28 int res; \
29 \
30 res = scnprintf(buf, buflen, fmt "\n", ##value); \
31 return simple_read_from_buffer(userbuf, count, ppos, buf, res); \
32} \
33 \
34static const struct file_operations name## _ops = { \
35 .read = name## _read, \
36 .open = cfg80211_open_file_generic, \
37 .llseek = generic_file_llseek, \
38};
39
40DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
41 wiphy->rts_threshold)
42DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
43 wiphy->frag_threshold);
44DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
45 wiphy->retry_short)
46DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
47 wiphy->retry_long);
48
49static int ht_print_chan(struct ieee80211_channel *chan,
50 char *buf, int buf_size, int offset)
51{
52 if (WARN_ON(offset > buf_size))
53 return 0;
54
55 if (chan->flags & IEEE80211_CHAN_DISABLED)
56 return snprintf(buf + offset,
57 buf_size - offset,
58 "%d Disabled\n",
59 chan->center_freq);
60
61 return snprintf(buf + offset,
62 buf_size - offset,
63 "%d HT40 %c%c\n",
64 chan->center_freq,
65 (chan->flags & IEEE80211_CHAN_NO_HT40MINUS) ? ' ' : '-',
66 (chan->flags & IEEE80211_CHAN_NO_HT40PLUS) ? ' ' : '+');
67}
68
69static ssize_t ht40allow_map_read(struct file *file,
70 char __user *user_buf,
71 size_t count, loff_t *ppos)
72{
73 struct wiphy *wiphy = file->private_data;
74 char *buf;
75 unsigned int offset = 0, buf_size = PAGE_SIZE, i, r;
76 enum ieee80211_band band;
77 struct ieee80211_supported_band *sband;
78
79 buf = kzalloc(buf_size, GFP_KERNEL);
80 if (!buf)
81 return -ENOMEM;
82
83 mutex_lock(&cfg80211_mutex);
84
85 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
86 sband = wiphy->bands[band];
87 if (!sband)
88 continue;
89 for (i = 0; i < sband->n_channels; i++)
90 offset += ht_print_chan(&sband->channels[i],
91 buf, buf_size, offset);
92 }
93
94 mutex_unlock(&cfg80211_mutex);
95
96 r = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
97
98 kfree(buf);
99
100 return r;
101}
102
103static const struct file_operations ht40allow_map_ops = {
104 .read = ht40allow_map_read,
105 .open = cfg80211_open_file_generic,
106 .llseek = default_llseek,
107};
108
109#define DEBUGFS_ADD(name) \
110 debugfs_create_file(#name, S_IRUGO, phyd, &rdev->wiphy, &name## _ops);
111
112void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
113{
114 struct dentry *phyd = rdev->wiphy.debugfsdir;
115
116 DEBUGFS_ADD(rts_threshold);
117 DEBUGFS_ADD(fragmentation_threshold);
118 DEBUGFS_ADD(short_retry_limit);
119 DEBUGFS_ADD(long_retry_limit);
120 DEBUGFS_ADD(ht40allow_map);
121}