1 /*
2 
3   Broadcom B43legacy wireless driver
4 
5   SYSFS support routines
6 
7   Copyright (c) 2006 Michael Buesch <m@bues.ch>
8 
9   This program is free software; you can redistribute it and/or modify
10   it under the terms of the GNU General Public License as published by
11   the Free Software Foundation; either version 2 of the License, or
12   (at your option) any later version.
13 
14   This program is distributed in the hope that it will be useful,
15   but WITHOUT ANY WARRANTY; without even the implied warranty of
16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17   GNU General Public License for more details.
18 
19   You should have received a copy of the GNU General Public License
20   along with this program; see the file COPYING.  If not, write to
21   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
22   Boston, MA 02110-1301, USA.
23 
24 */
25 
26 #include "sysfs.h"
27 #include "b43legacy.h"
28 #include "main.h"
29 #include "phy.h"
30 #include "radio.h"
31 
32 #include <linux/capability.h>
33 
34 
35 #define GENERIC_FILESIZE	64
36 
37 
38 static int get_integer(const char *buf, size_t count)
39 {
40 	char tmp[10 + 1] = { 0 };
41 	int ret = -EINVAL;
42 
43 	if (count == 0)
44 		goto out;
45 	count = min_t(size_t, count, 10);
46 	memcpy(tmp, buf, count);
47 	ret = simple_strtol(tmp, NULL, 10);
48 out:
49 	return ret;
50 }
51 
52 static int get_boolean(const char *buf, size_t count)
53 {
54 	if (count != 0) {
55 		if (buf[0] == '1')
56 			return 1;
57 		if (buf[0] == '0')
58 			return 0;
59 		if (count >= 4 && memcmp(buf, "true", 4) == 0)
60 			return 1;
61 		if (count >= 5 && memcmp(buf, "false", 5) == 0)
62 			return 0;
63 		if (count >= 3 && memcmp(buf, "yes", 3) == 0)
64 			return 1;
65 		if (count >= 2 && memcmp(buf, "no", 2) == 0)
66 			return 0;
67 		if (count >= 2 && memcmp(buf, "on", 2) == 0)
68 			return 1;
69 		if (count >= 3 && memcmp(buf, "off", 3) == 0)
70 			return 0;
71 	}
72 	return -EINVAL;
73 }
74 
75 static ssize_t b43legacy_attr_interfmode_show(struct device *dev,
76 					      struct device_attribute *attr,
77 					      char *buf)
78 {
79 	struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
80 	ssize_t count = 0;
81 
82 	if (!capable(CAP_NET_ADMIN))
83 		return -EPERM;
84 
85 	mutex_lock(&wldev->wl->mutex);
86 
87 	switch (wldev->phy.interfmode) {
88 	case B43legacy_INTERFMODE_NONE:
89 		count = snprintf(buf, PAGE_SIZE, "0 (No Interference"
90 				 " Mitigation)\n");
91 		break;
92 	case B43legacy_INTERFMODE_NONWLAN:
93 		count = snprintf(buf, PAGE_SIZE, "1 (Non-WLAN Interference"
94 				 " Mitigation)\n");
95 		break;
96 	case B43legacy_INTERFMODE_MANUALWLAN:
97 		count = snprintf(buf, PAGE_SIZE, "2 (WLAN Interference"
98 				 " Mitigation)\n");
99 		break;
100 	default:
101 		B43legacy_WARN_ON(1);
102 	}
103 
104 	mutex_unlock(&wldev->wl->mutex);
105 
106 	return count;
107 }
108 
109 static ssize_t b43legacy_attr_interfmode_store(struct device *dev,
110 					       struct device_attribute *attr,
111 					       const char *buf, size_t count)
112 {
113 	struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
114 	unsigned long flags;
115 	int err;
116 	int mode;
117 
118 	if (!capable(CAP_NET_ADMIN))
119 		return -EPERM;
120 
121 	mode = get_integer(buf, count);
122 	switch (mode) {
123 	case 0:
124 		mode = B43legacy_INTERFMODE_NONE;
125 		break;
126 	case 1:
127 		mode = B43legacy_INTERFMODE_NONWLAN;
128 		break;
129 	case 2:
130 		mode = B43legacy_INTERFMODE_MANUALWLAN;
131 		break;
132 	case 3:
133 		mode = B43legacy_INTERFMODE_AUTOWLAN;
134 		break;
135 	default:
136 		return -EINVAL;
137 	}
138 
139 	mutex_lock(&wldev->wl->mutex);
140 	spin_lock_irqsave(&wldev->wl->irq_lock, flags);
141 
142 	err = b43legacy_radio_set_interference_mitigation(wldev, mode);
143 	if (err)
144 		b43legacyerr(wldev->wl, "Interference Mitigation not "
145 		       "supported by device\n");
146 	spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
147 	mutex_unlock(&wldev->wl->mutex);
148 
149 	return err ? err : count;
150 }
151 
152 static DEVICE_ATTR(interference, 0644,
153 		   b43legacy_attr_interfmode_show,
154 		   b43legacy_attr_interfmode_store);
155 
156 static ssize_t b43legacy_attr_preamble_show(struct device *dev,
157 					    struct device_attribute *attr,
158 					    char *buf)
159 {
160 	struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
161 	ssize_t count;
162 
163 	if (!capable(CAP_NET_ADMIN))
164 		return -EPERM;
165 
166 	mutex_lock(&wldev->wl->mutex);
167 
168 	if (wldev->short_preamble)
169 		count = snprintf(buf, PAGE_SIZE, "1 (Short Preamble"
170 				 " enabled)\n");
171 	else
172 		count = snprintf(buf, PAGE_SIZE, "0 (Short Preamble"
173 				 " disabled)\n");
174 
175 	mutex_unlock(&wldev->wl->mutex);
176 
177 	return count;
178 }
179 
180 static ssize_t b43legacy_attr_preamble_store(struct device *dev,
181 					     struct device_attribute *attr,
182 					     const char *buf, size_t count)
183 {
184 	struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
185 	unsigned long flags;
186 	int value;
187 
188 	if (!capable(CAP_NET_ADMIN))
189 		return -EPERM;
190 
191 	value = get_boolean(buf, count);
192 	if (value < 0)
193 		return value;
194 	mutex_lock(&wldev->wl->mutex);
195 	spin_lock_irqsave(&wldev->wl->irq_lock, flags);
196 
197 	wldev->short_preamble = !!value;
198 
199 	spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
200 	mutex_unlock(&wldev->wl->mutex);
201 
202 	return count;
203 }
204 
205 static DEVICE_ATTR(shortpreamble, 0644,
206 		   b43legacy_attr_preamble_show,
207 		   b43legacy_attr_preamble_store);
208 
209 int b43legacy_sysfs_register(struct b43legacy_wldev *wldev)
210 {
211 	struct device *dev = wldev->dev->dev;
212 	int err;
213 
214 	B43legacy_WARN_ON(b43legacy_status(wldev) !=
215 			  B43legacy_STAT_INITIALIZED);
216 
217 	err = device_create_file(dev, &dev_attr_interference);
218 	if (err)
219 		goto out;
220 	err = device_create_file(dev, &dev_attr_shortpreamble);
221 	if (err)
222 		goto err_remove_interfmode;
223 
224 out:
225 	return err;
226 err_remove_interfmode:
227 	device_remove_file(dev, &dev_attr_interference);
228 	goto out;
229 }
230 
231 void b43legacy_sysfs_unregister(struct b43legacy_wldev *wldev)
232 {
233 	struct device *dev = wldev->dev->dev;
234 
235 	device_remove_file(dev, &dev_attr_shortpreamble);
236 	device_remove_file(dev, &dev_attr_interference);
237 }
238