simple_open: automatically convert to simple_open()
[linux-2.6.git] / 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...)              \
17 static 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                                                                         \
28 static const struct file_operations name## _ops = {                     \
29         .read = name## _read,                                           \
30         .open = simple_open,                                            \
31         .llseek = generic_file_llseek,                                  \
32 };
33
34 DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
35                       wiphy->rts_threshold)
36 DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
37                       wiphy->frag_threshold);
38 DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
39                       wiphy->retry_short)
40 DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
41                       wiphy->retry_long);
42
43 static 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 snprintf(buf + offset,
51                                 buf_size - offset,
52                                 "%d Disabled\n",
53                                 chan->center_freq);
54
55         return snprintf(buf + offset,
56                         buf_size - offset,
57                         "%d HT40 %c%c\n",
58                         chan->center_freq,
59                         (chan->flags & IEEE80211_CHAN_NO_HT40MINUS) ? ' ' : '-',
60                         (chan->flags & IEEE80211_CHAN_NO_HT40PLUS)  ? ' ' : '+');
61 }
62
63 static ssize_t ht40allow_map_read(struct file *file,
64                                   char __user *user_buf,
65                                   size_t count, loff_t *ppos)
66 {
67         struct wiphy *wiphy = file->private_data;
68         char *buf;
69         unsigned int offset = 0, buf_size = PAGE_SIZE, i, r;
70         enum ieee80211_band band;
71         struct ieee80211_supported_band *sband;
72
73         buf = kzalloc(buf_size, GFP_KERNEL);
74         if (!buf)
75                 return -ENOMEM;
76
77         mutex_lock(&cfg80211_mutex);
78
79         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
80                 sband = wiphy->bands[band];
81                 if (!sband)
82                         continue;
83                 for (i = 0; i < sband->n_channels; i++)
84                         offset += ht_print_chan(&sband->channels[i],
85                                                 buf, buf_size, offset);
86         }
87
88         mutex_unlock(&cfg80211_mutex);
89
90         r = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
91
92         kfree(buf);
93
94         return r;
95 }
96
97 static const struct file_operations ht40allow_map_ops = {
98         .read = ht40allow_map_read,
99         .open = simple_open,
100         .llseek = default_llseek,
101 };
102
103 #define DEBUGFS_ADD(name)                                               \
104         debugfs_create_file(#name, S_IRUGO, phyd, &rdev->wiphy, &name## _ops);
105
106 void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
107 {
108         struct dentry *phyd = rdev->wiphy.debugfsdir;
109
110         DEBUGFS_ADD(rts_threshold);
111         DEBUGFS_ADD(fragmentation_threshold);
112         DEBUGFS_ADD(short_retry_limit);
113         DEBUGFS_ADD(long_retry_limit);
114         DEBUGFS_ADD(ht40allow_map);
115 }