GNU Linux-libre 4.14.266-gnu1
[releases.git] / net / wireless / debugfs.c
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...)              \
17 static 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                                                                         \
28 static const struct file_operations name## _ops = {                     \
29         .read = name## _read,                                           \
30         .open = simple_open,                                            \
31         .llseek = generic_file_llseek,                                  \
32 }
33
34 DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
35                       wiphy->rts_threshold);
36 DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
37                       wiphy->frag_threshold);
38 DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
39                       wiphy->retry_short);
40 DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
41                       wiphy->retry_long);
42
43 static 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
65 static 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 nl80211_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 < NUM_NL80211_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
99 static 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, 0444, phyd, &rdev->wiphy, &name## _ops)
107
108 void 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 }