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 "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         debugfs_create_file(#name, S_IRUGO, phyd, &rdev->wiphy, &name## _ops);
 108
 109 void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
 110 {
 111         struct dentry *phyd = rdev->wiphy.debugfsdir;
 112
 113         DEBUGFS_ADD(rts_threshold);
 114         DEBUGFS_ADD(fragmentation_threshold);
 115         DEBUGFS_ADD(short_retry_limit);
 116         DEBUGFS_ADD(long_retry_limit);
 117         DEBUGFS_ADD(ht40allow_map);
 118 }