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 "core.h"
13 #include "debugfs.h"
14
15 static int cfg80211_open_file_generic(struct inode *inode, struct file *file)
16 {
17 file->private_data = inode->i_private;
18 return 0;
19 }
20
21 #define DEBUGFS_READONLY_FILE(name, buflen, fmt, value...) \
22 static ssize_t name## _read(struct file *file, char __user *userbuf, \
23 size_t count, loff_t *ppos) \
24 { \
25 struct wiphy *wiphy= file->private_data; \
26 char buf[buflen]; \
27 int res; \
28 \
29 res = scnprintf(buf, buflen, fmt "\n", ##value); \
30 return simple_read_from_buffer(userbuf, count, ppos, buf, res); \
31 } \
32 \
33 static const struct file_operations name## _ops = { \
34 .read = name## _read, \
35 .open = cfg80211_open_file_generic, \
36 };
37
38 DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
39 wiphy->rts_threshold)
40 DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
41 wiphy->frag_threshold);
42 DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
43 wiphy->retry_short)
44 DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
45 wiphy->retry_long);
46
47 static int ht_print_chan(struct ieee80211_channel *chan,
48 char *buf, int buf_size, int offset)
49 {
50 if (WARN_ON(offset > buf_size))
51 return 0;
52
53 if (chan->flags & IEEE80211_CHAN_DISABLED)
54 return snprintf(buf + offset,
55 buf_size - offset,
56 "%d Disabled\n",
57 chan->center_freq);
58
59 return snprintf(buf + offset,
60 buf_size - offset,
61 "%d HT40 %c%c\n",
62 chan->center_freq,
63 (chan->flags & IEEE80211_CHAN_NO_HT40MINUS) ? ' ' : '-',
64 (chan->flags & IEEE80211_CHAN_NO_HT40PLUS) ? ' ' : '+');
65 }
66
67 static ssize_t ht40allow_map_read(struct file *file,
68 char __user *user_buf,
69 size_t count, loff_t *ppos)
70 {
71 struct wiphy *wiphy = file->private_data;
72 char *buf;
73 unsigned int offset = 0, buf_size = PAGE_SIZE, i, r;
74 enum ieee80211_band band;
75 struct ieee80211_supported_band *sband;
76
77 buf = kzalloc(buf_size, GFP_KERNEL);
78 if (!buf)
79 return -ENOMEM;
80
81 mutex_lock(&cfg80211_mutex);
82
83 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
84 sband = wiphy->bands[band];
85 if (!sband)
86 continue;
87 for (i = 0; i < sband->n_channels; i++)
88 offset += ht_print_chan(&sband->channels[i],
89 buf, buf_size, offset);
90 }
91
92 mutex_unlock(&cfg80211_mutex);
93
94 r = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
95
96 kfree(buf);
97
98 return r;
99 }
100
101 static const struct file_operations ht40allow_map_ops = {
102 .read = ht40allow_map_read,
103 .open = cfg80211_open_file_generic,
104 };
105
106 #define DEBUGFS_ADD(name) \
107 drv->debugfs.name = debugfs_create_file(#name, S_IRUGO, phyd, \
108 &drv->wiphy, &name## _ops);
109 #define DEBUGFS_DEL(name) \
110 debugfs_remove(drv->debugfs.name); \
111 drv->debugfs.name = NULL;
112
113 void cfg80211_debugfs_drv_add(struct cfg80211_registered_device *drv)
114 {
115 struct dentry *phyd = drv->wiphy.debugfsdir;
116
117 DEBUGFS_ADD(rts_threshold);
118 DEBUGFS_ADD(fragmentation_threshold);
119 DEBUGFS_ADD(short_retry_limit);
120 DEBUGFS_ADD(long_retry_limit);
121 DEBUGFS_ADD(ht40allow_map);
122 }
123
124 void cfg80211_debugfs_drv_del(struct cfg80211_registered_device *drv)
125 {
126 DEBUGFS_DEL(rts_threshold);
127 DEBUGFS_DEL(fragmentation_threshold);
128 DEBUGFS_DEL(short_retry_limit);
129 DEBUGFS_DEL(long_retry_limit);
130 DEBUGFS_DEL(ht40allow_map);
131 }
132
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