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 }