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 static 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...)              \
  23 static 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                                                                         \
  34 static const struct file_operations name## _ops = {                     \
  35         .read = name## _read,                                           \
  36         .open = cfg80211_open_file_generic,                             \
  37         .llseek = generic_file_llseek,                                  \
  38 };
  39
  40 DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
  41                       wiphy->rts_threshold)
  42 DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
  43                       wiphy->frag_threshold);
  44 DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
  45                       wiphy->retry_short)
  46 DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
  47                       wiphy->retry_long);
  48
  49 static 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
  69 static 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
 103 static 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
 112 void 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 }