1/*
2 * Copyright (c) 2008-2011 Atheros Communications Inc.
3 * Copyright (c) 2011 Neratec Solutions AG
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include <linux/debugfs.h>
19#include <linux/export.h>
20
21#include "ath9k.h"
22#include "dfs_debug.h"
23#include "../dfs_pattern_detector.h"
24
25static struct ath_dfs_pool_stats dfs_pool_stats = { 0 };
26
27#define ATH9K_DFS_STAT(s, p) \
28	len += scnprintf(buf + len, size - len, "%28s : %10u\n", s, \
29			 sc->debug.stats.dfs_stats.p);
30#define ATH9K_DFS_POOL_STAT(s, p) \
31	len += scnprintf(buf + len, size - len, "%28s : %10u\n", s, \
32			 dfs_pool_stats.p);
33
34static ssize_t read_file_dfs(struct file *file, char __user *user_buf,
35			     size_t count, loff_t *ppos)
36{
37	struct ath_softc *sc = file->private_data;
38	struct ath9k_hw_version *hw_ver = &sc->sc_ah->hw_version;
39	char *buf;
40	unsigned int len = 0, size = 8000;
41	ssize_t retval = 0;
42
43	buf = kzalloc(size, GFP_KERNEL);
44	if (buf == NULL)
45		return -ENOMEM;
46
47	len += scnprintf(buf + len, size - len, "DFS support for "
48			 "macVersion = 0x%x, macRev = 0x%x: %s\n",
49			 hw_ver->macVersion, hw_ver->macRev,
50			 (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_DFS) ?
51					"enabled" : "disabled");
52
53	if (!sc->dfs_detector) {
54		len += scnprintf(buf + len, size - len,
55				 "DFS detector not enabled\n");
56		goto exit;
57	}
58
59	dfs_pool_stats = sc->dfs_detector->get_stats(sc->dfs_detector);
60
61	len += scnprintf(buf + len, size - len, "Pulse detector statistics:\n");
62	ATH9K_DFS_STAT("pulse events reported   ", pulses_total);
63	ATH9K_DFS_STAT("invalid pulse events    ", pulses_no_dfs);
64	ATH9K_DFS_STAT("DFS pulses detected     ", pulses_detected);
65	ATH9K_DFS_STAT("Datalen discards        ", datalen_discards);
66	ATH9K_DFS_STAT("RSSI discards           ", rssi_discards);
67	ATH9K_DFS_STAT("BW info discards        ", bwinfo_discards);
68	ATH9K_DFS_STAT("Primary channel pulses  ", pri_phy_errors);
69	ATH9K_DFS_STAT("Secondary channel pulses", ext_phy_errors);
70	ATH9K_DFS_STAT("Dual channel pulses     ", dc_phy_errors);
71	len += scnprintf(buf + len, size - len, "Radar detector statistics "
72			 "(current DFS region: %d)\n",
73			 sc->dfs_detector->region);
74	ATH9K_DFS_STAT("Pulse events processed  ", pulses_processed);
75	ATH9K_DFS_STAT("Radars detected         ", radar_detected);
76	len += scnprintf(buf + len, size - len, "Global Pool statistics:\n");
77	ATH9K_DFS_POOL_STAT("Pool references         ", pool_reference);
78	ATH9K_DFS_POOL_STAT("Pulses allocated        ", pulse_allocated);
79	ATH9K_DFS_POOL_STAT("Pulses alloc error      ", pulse_alloc_error);
80	ATH9K_DFS_POOL_STAT("Pulses in use           ", pulse_used);
81	ATH9K_DFS_POOL_STAT("Seqs. allocated         ", pseq_allocated);
82	ATH9K_DFS_POOL_STAT("Seqs. alloc error       ", pseq_alloc_error);
83	ATH9K_DFS_POOL_STAT("Seqs. in use            ", pseq_used);
84
85exit:
86	if (len > size)
87		len = size;
88
89	retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
90	kfree(buf);
91
92	return retval;
93}
94
95/* magic number to prevent accidental reset of DFS statistics */
96#define DFS_STATS_RESET_MAGIC	0x80000000
97static ssize_t write_file_dfs(struct file *file, const char __user *user_buf,
98			      size_t count, loff_t *ppos)
99{
100	struct ath_softc *sc = file->private_data;
101	unsigned long val;
102	char buf[32];
103	ssize_t len;
104
105	len = min(count, sizeof(buf) - 1);
106	if (copy_from_user(buf, user_buf, len))
107		return -EFAULT;
108
109	buf[len] = '\0';
110	if (kstrtoul(buf, 0, &val))
111		return -EINVAL;
112
113	if (val == DFS_STATS_RESET_MAGIC)
114		memset(&sc->debug.stats.dfs_stats, 0,
115		       sizeof(sc->debug.stats.dfs_stats));
116	return count;
117}
118
119static ssize_t write_file_simulate_radar(struct file *file,
120					 const char __user *user_buf,
121					 size_t count, loff_t *ppos)
122{
123	struct ath_softc *sc = file->private_data;
124
125	ieee80211_radar_detected(sc->hw);
126
127	return count;
128}
129
130static const struct file_operations fops_simulate_radar = {
131	.write = write_file_simulate_radar,
132	.open = simple_open,
133	.owner = THIS_MODULE,
134	.llseek = default_llseek,
135};
136
137static const struct file_operations fops_dfs_stats = {
138	.read = read_file_dfs,
139	.write = write_file_dfs,
140	.open = simple_open,
141	.owner = THIS_MODULE,
142	.llseek = default_llseek,
143};
144
145void ath9k_dfs_init_debug(struct ath_softc *sc)
146{
147	debugfs_create_file("dfs_stats", S_IRUSR,
148			    sc->debug.debugfs_phy, sc, &fops_dfs_stats);
149	debugfs_create_file("dfs_simulate_radar", S_IWUSR,
150			    sc->debug.debugfs_phy, sc, &fops_simulate_radar);
151}
152