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 rdev->debugfs.name = debugfs_create_file(#name, S_IRUGO, phyd, \ 108 &rdev->wiphy, &name## _ops); 109 #define DEBUGFS_DEL(name) \ 110 debugfs_remove(rdev->debugfs.name); \ 111 rdev->debugfs.name = NULL; 112 113 void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev) 114 { 115 struct dentry *phyd = rdev->wiphy.debugfsdir; 116 117 DEBUGFS_ADD(rts_threshold); 118 DEBUGFS_ADD(fragmentation_threshold); 119 DEBUGFS_ADD(short_retry_limit); 120 DEBUGFS_ADD(long_retry_limit); 121 DEBUGFS_ADD(ht40allow_map); 122 } 123 124 void cfg80211_debugfs_rdev_del(struct cfg80211_registered_device *rdev) 125 { 126 DEBUGFS_DEL(rts_threshold); 127 DEBUGFS_DEL(fragmentation_threshold); 128 DEBUGFS_DEL(short_retry_limit); 129 DEBUGFS_DEL(long_retry_limit); 130 DEBUGFS_DEL(ht40allow_map); 131 } 132