1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * cfg80211 debugfs |
4 | * |
5 | * Copyright 2009 Luis R. Rodriguez <lrodriguez@atheros.com> |
6 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> |
7 | */ |
8 | |
9 | #include <linux/slab.h> |
10 | #include "core.h" |
11 | #include "debugfs.h" |
12 | |
13 | #define DEBUGFS_READONLY_FILE(name, buflen, fmt, value...) \ |
14 | static ssize_t name## _read(struct file *file, char __user *userbuf, \ |
15 | size_t count, loff_t *ppos) \ |
16 | { \ |
17 | struct wiphy *wiphy = file->private_data; \ |
18 | char buf[buflen]; \ |
19 | int res; \ |
20 | \ |
21 | res = scnprintf(buf, buflen, fmt "\n", ##value); \ |
22 | return simple_read_from_buffer(userbuf, count, ppos, buf, res); \ |
23 | } \ |
24 | \ |
25 | static const struct file_operations name## _ops = { \ |
26 | .read = name## _read, \ |
27 | .open = simple_open, \ |
28 | .llseek = generic_file_llseek, \ |
29 | } |
30 | |
31 | DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d" , |
32 | wiphy->rts_threshold); |
33 | DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d" , |
34 | wiphy->frag_threshold); |
35 | DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d" , |
36 | wiphy->retry_short); |
37 | DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d" , |
38 | wiphy->retry_long); |
39 | |
40 | static int ht_print_chan(struct ieee80211_channel *chan, |
41 | char *buf, int buf_size, int offset) |
42 | { |
43 | if (WARN_ON(offset > buf_size)) |
44 | return 0; |
45 | |
46 | if (chan->flags & IEEE80211_CHAN_DISABLED) |
47 | return scnprintf(buf: buf + offset, |
48 | size: buf_size - offset, |
49 | fmt: "%d Disabled\n" , |
50 | chan->center_freq); |
51 | |
52 | return scnprintf(buf: buf + offset, |
53 | size: buf_size - offset, |
54 | fmt: "%d HT40 %c%c\n" , |
55 | chan->center_freq, |
56 | (chan->flags & IEEE80211_CHAN_NO_HT40MINUS) ? |
57 | ' ' : '-', |
58 | (chan->flags & IEEE80211_CHAN_NO_HT40PLUS) ? |
59 | ' ' : '+'); |
60 | } |
61 | |
62 | static ssize_t ht40allow_map_read(struct file *file, |
63 | char __user *user_buf, |
64 | size_t count, loff_t *ppos) |
65 | { |
66 | struct wiphy *wiphy = file->private_data; |
67 | char *buf; |
68 | unsigned int offset = 0, buf_size = PAGE_SIZE, i; |
69 | enum nl80211_band band; |
70 | struct ieee80211_supported_band *sband; |
71 | ssize_t r; |
72 | |
73 | buf = kzalloc(size: buf_size, GFP_KERNEL); |
74 | if (!buf) |
75 | return -ENOMEM; |
76 | |
77 | for (band = 0; band < NUM_NL80211_BANDS; band++) { |
78 | sband = wiphy->bands[band]; |
79 | if (!sband) |
80 | continue; |
81 | for (i = 0; i < sband->n_channels; i++) |
82 | offset += ht_print_chan(chan: &sband->channels[i], |
83 | buf, buf_size, offset); |
84 | } |
85 | |
86 | r = simple_read_from_buffer(to: user_buf, count, ppos, from: buf, available: offset); |
87 | |
88 | kfree(objp: buf); |
89 | |
90 | return r; |
91 | } |
92 | |
93 | static const struct file_operations ht40allow_map_ops = { |
94 | .read = ht40allow_map_read, |
95 | .open = simple_open, |
96 | .llseek = default_llseek, |
97 | }; |
98 | |
99 | #define DEBUGFS_ADD(name) \ |
100 | debugfs_create_file(#name, 0444, phyd, &rdev->wiphy, &name## _ops) |
101 | |
102 | void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev) |
103 | { |
104 | struct dentry *phyd = rdev->wiphy.debugfsdir; |
105 | |
106 | DEBUGFS_ADD(rts_threshold); |
107 | DEBUGFS_ADD(fragmentation_threshold); |
108 | DEBUGFS_ADD(short_retry_limit); |
109 | DEBUGFS_ADD(long_retry_limit); |
110 | DEBUGFS_ADD(ht40allow_map); |
111 | } |
112 | |