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 static 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...) \ 23 static 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 \ 34 static const struct file_operations name## _ops = { \ 35 .read = name## _read, \ 36 .open = cfg80211_open_file_generic, \ 37 .llseek = generic_file_llseek, \ 38 }; 39 40 DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d", 41 wiphy->rts_threshold) 42 DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d", 43 wiphy->frag_threshold); 44 DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d", 45 wiphy->retry_short) 46 DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d", 47 wiphy->retry_long); 48 49 static 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 69 static 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 } 102 103 static 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); 111 112 void 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