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}; 38 39DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d", 40 wiphy->rts_threshold) 41DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d", 42 wiphy->frag_threshold); 43DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d", 44 wiphy->retry_short) 45DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d", 46 wiphy->retry_long); 47 48static int ht_print_chan(struct ieee80211_channel *chan, 49 char *buf, int buf_size, int offset) 50{ 51 if (WARN_ON(offset > buf_size)) 52 return 0; 53 54 if (chan->flags & IEEE80211_CHAN_DISABLED) 55 return snprintf(buf + offset, 56 buf_size - offset, 57 "%d Disabled\n", 58 chan->center_freq); 59 60 return snprintf(buf + offset, 61 buf_size - offset, 62 "%d HT40 %c%c\n", 63 chan->center_freq, 64 (chan->flags & IEEE80211_CHAN_NO_HT40MINUS) ? ' ' : '-', 65 (chan->flags & IEEE80211_CHAN_NO_HT40PLUS) ? ' ' : '+'); 66} 67 68static ssize_t ht40allow_map_read(struct file *file, 69 char __user *user_buf, 70 size_t count, loff_t *ppos) 71{ 72 struct wiphy *wiphy = file->private_data; 73 char *buf; 74 unsigned int offset = 0, buf_size = PAGE_SIZE, i, r; 75 enum ieee80211_band band; 76 struct ieee80211_supported_band *sband; 77 78 buf = kzalloc(buf_size, GFP_KERNEL); 79 if (!buf) 80 return -ENOMEM; 81 82 mutex_lock(&cfg80211_mutex); 83 84 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 85 sband = wiphy->bands[band]; 86 if (!sband) 87 continue; 88 for (i = 0; i < sband->n_channels; i++) 89 offset += ht_print_chan(&sband->channels[i], 90 buf, buf_size, offset); 91 } 92 93 mutex_unlock(&cfg80211_mutex); 94 95 r = simple_read_from_buffer(user_buf, count, ppos, buf, offset); 96 97 kfree(buf); 98 99 return r; 100} 101 102static const struct file_operations ht40allow_map_ops = { 103 .read = ht40allow_map_read, 104 .open = cfg80211_open_file_generic, 105}; 106 107#define DEBUGFS_ADD(name) \ 108 debugfs_create_file(#name, S_IRUGO, phyd, &rdev->wiphy, &name## _ops); 109 110void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev) 111{ 112 struct dentry *phyd = rdev->wiphy.debugfsdir; 113 114 DEBUGFS_ADD(rts_threshold); 115 DEBUGFS_ADD(fragmentation_threshold); 116 DEBUGFS_ADD(short_retry_limit); 117 DEBUGFS_ADD(long_retry_limit); 118 DEBUGFS_ADD(ht40allow_map); 119} 120