LXR linux/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...)              \
  17static 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                                                                        \
  28static const struct file_operations name## _ops = {                     \
  29        .read = name## _read,                                           \
  30        .open = simple_open,                                            \
  31        .llseek = generic_file_llseek,                                  \
  32};
  33
  34DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
  35                      wiphy->rts_threshold)
  36DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
  37                      wiphy->frag_threshold);
  38DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
  39                      wiphy->retry_short)
  40DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
  41                      wiphy->retry_long);
  42
  43static 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
  65static 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 ieee80211_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 < IEEE80211_NUM_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
  99static 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, S_IRUGO, phyd, &rdev->wiphy, &name## _ops);
 107
 108void 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}
 118