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
  16static 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...)              \
  23static 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                                                                        \
  34static const struct file_operations name## _ops = {                     \
  35        .read = name## _read,                                           \
  36        .open = cfg80211_open_file_generic,                             \
  37        .llseek = generic_file_llseek,                                  \
  38};
  39
  40DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
  41                      wiphy->rts_threshold)
  42DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
  43                      wiphy->frag_threshold);
  44DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
  45                      wiphy->retry_short)
  46DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
  47                      wiphy->retry_long);
  48
  49static 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
  69static 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
 103static 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
 112void 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}
 122