xref: /openbmc/linux/net/wireless/debugfs.c (revision ca48739e)
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 + offset,
48 				 buf_size - offset,
49 				 "%d Disabled\n",
50 				 chan->center_freq);
51 
52 	return scnprintf(buf + offset,
53 			 buf_size - offset,
54 			 "%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, r;
69 	enum nl80211_band band;
70 	struct ieee80211_supported_band *sband;
71 
72 	buf = kzalloc(buf_size, GFP_KERNEL);
73 	if (!buf)
74 		return -ENOMEM;
75 
76 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
77 		sband = wiphy->bands[band];
78 		if (!sband)
79 			continue;
80 		for (i = 0; i < sband->n_channels; i++)
81 			offset += ht_print_chan(&sband->channels[i],
82 						buf, buf_size, offset);
83 	}
84 
85 	r = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
86 
87 	kfree(buf);
88 
89 	return r;
90 }
91 
92 static const struct file_operations ht40allow_map_ops = {
93 	.read = ht40allow_map_read,
94 	.open = simple_open,
95 	.llseek = default_llseek,
96 };
97 
98 #define DEBUGFS_ADD(name)						\
99 	debugfs_create_file(#name, 0444, phyd, &rdev->wiphy, &name## _ops)
100 
101 void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
102 {
103 	struct dentry *phyd = rdev->wiphy.debugfsdir;
104 
105 	DEBUGFS_ADD(rts_threshold);
106 	DEBUGFS_ADD(fragmentation_threshold);
107 	DEBUGFS_ADD(short_retry_limit);
108 	DEBUGFS_ADD(long_retry_limit);
109 	DEBUGFS_ADD(ht40allow_map);
110 }
111