tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3
4 Broadcom B43legacy wireless driver
5
6 SYSFS support routines
7
8 Copyright (c) 2006 Michael Buesch <m@bues.ch>
9
10
11*/
12
13#include "sysfs.h"
14#include "b43legacy.h"
15#include "main.h"
16#include "phy.h"
17#include "radio.h"
18
19#include <linux/capability.h>
20
21
22#define GENERIC_FILESIZE 64
23
24
25static int get_integer(const char *buf, size_t count)
26{
27 char tmp[10 + 1] = { 0 };
28 int ret = -EINVAL, res;
29
30 if (count == 0)
31 goto out;
32 count = min_t(size_t, count, 10);
33 memcpy(tmp, buf, count);
34 ret = kstrtoint(tmp, 10, &res);
35 if (!ret)
36 return res;
37out:
38 return ret;
39}
40
41static int get_boolean(const char *buf, size_t count)
42{
43 if (count != 0) {
44 if (buf[0] == '1')
45 return 1;
46 if (buf[0] == '0')
47 return 0;
48 if (count >= 4 && memcmp(buf, "true", 4) == 0)
49 return 1;
50 if (count >= 5 && memcmp(buf, "false", 5) == 0)
51 return 0;
52 if (count >= 3 && memcmp(buf, "yes", 3) == 0)
53 return 1;
54 if (count >= 2 && memcmp(buf, "no", 2) == 0)
55 return 0;
56 if (count >= 2 && memcmp(buf, "on", 2) == 0)
57 return 1;
58 if (count >= 3 && memcmp(buf, "off", 3) == 0)
59 return 0;
60 }
61 return -EINVAL;
62}
63
64static ssize_t b43legacy_attr_interfmode_show(struct device *dev,
65 struct device_attribute *attr,
66 char *buf)
67{
68 struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
69 ssize_t count = 0;
70
71 if (!capable(CAP_NET_ADMIN))
72 return -EPERM;
73
74 mutex_lock(&wldev->wl->mutex);
75
76 switch (wldev->phy.interfmode) {
77 case B43legacy_INTERFMODE_NONE:
78 count = sysfs_emit(buf, "0 (No Interference Mitigation)\n");
79 break;
80 case B43legacy_INTERFMODE_NONWLAN:
81 count = sysfs_emit(buf,
82 "1 (Non-WLAN Interference Mitigation)\n");
83 break;
84 case B43legacy_INTERFMODE_MANUALWLAN:
85 count = sysfs_emit(buf, "2 (WLAN Interference Mitigation)\n");
86 break;
87 default:
88 B43legacy_WARN_ON(1);
89 }
90
91 mutex_unlock(&wldev->wl->mutex);
92
93 return count;
94}
95
96static ssize_t b43legacy_attr_interfmode_store(struct device *dev,
97 struct device_attribute *attr,
98 const char *buf, size_t count)
99{
100 struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
101 unsigned long flags;
102 int err;
103 int mode;
104
105 if (!capable(CAP_NET_ADMIN))
106 return -EPERM;
107
108 mode = get_integer(buf, count);
109 switch (mode) {
110 case 0:
111 mode = B43legacy_INTERFMODE_NONE;
112 break;
113 case 1:
114 mode = B43legacy_INTERFMODE_NONWLAN;
115 break;
116 case 2:
117 mode = B43legacy_INTERFMODE_MANUALWLAN;
118 break;
119 case 3:
120 mode = B43legacy_INTERFMODE_AUTOWLAN;
121 break;
122 default:
123 return -EINVAL;
124 }
125
126 mutex_lock(&wldev->wl->mutex);
127 spin_lock_irqsave(&wldev->wl->irq_lock, flags);
128
129 err = b43legacy_radio_set_interference_mitigation(wldev, mode);
130 if (err)
131 b43legacyerr(wldev->wl, "Interference Mitigation not "
132 "supported by device\n");
133 spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
134 mutex_unlock(&wldev->wl->mutex);
135
136 return err ? err : count;
137}
138
139static DEVICE_ATTR(interference, 0644,
140 b43legacy_attr_interfmode_show,
141 b43legacy_attr_interfmode_store);
142
143static ssize_t b43legacy_attr_preamble_show(struct device *dev,
144 struct device_attribute *attr,
145 char *buf)
146{
147 struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
148 ssize_t count;
149
150 if (!capable(CAP_NET_ADMIN))
151 return -EPERM;
152
153 mutex_lock(&wldev->wl->mutex);
154
155 if (wldev->short_preamble)
156 count = sysfs_emit(buf, "1 (Short Preamble enabled)\n");
157 else
158 count = sysfs_emit(buf, "0 (Short Preamble disabled)\n");
159
160 mutex_unlock(&wldev->wl->mutex);
161
162 return count;
163}
164
165static ssize_t b43legacy_attr_preamble_store(struct device *dev,
166 struct device_attribute *attr,
167 const char *buf, size_t count)
168{
169 struct b43legacy_wldev *wldev = dev_to_b43legacy_wldev(dev);
170 unsigned long flags;
171 int value;
172
173 if (!capable(CAP_NET_ADMIN))
174 return -EPERM;
175
176 value = get_boolean(buf, count);
177 if (value < 0)
178 return value;
179 mutex_lock(&wldev->wl->mutex);
180 spin_lock_irqsave(&wldev->wl->irq_lock, flags);
181
182 wldev->short_preamble = !!value;
183
184 spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
185 mutex_unlock(&wldev->wl->mutex);
186
187 return count;
188}
189
190static DEVICE_ATTR(shortpreamble, 0644,
191 b43legacy_attr_preamble_show,
192 b43legacy_attr_preamble_store);
193
194int b43legacy_sysfs_register(struct b43legacy_wldev *wldev)
195{
196 struct device *dev = wldev->dev->dev;
197 int err;
198
199 B43legacy_WARN_ON(b43legacy_status(wldev) !=
200 B43legacy_STAT_INITIALIZED);
201
202 err = device_create_file(dev, &dev_attr_interference);
203 if (err)
204 goto out;
205 err = device_create_file(dev, &dev_attr_shortpreamble);
206 if (err)
207 goto err_remove_interfmode;
208
209out:
210 return err;
211err_remove_interfmode:
212 device_remove_file(dev, &dev_attr_interference);
213 goto out;
214}
215
216void b43legacy_sysfs_unregister(struct b43legacy_wldev *wldev)
217{
218 struct device *dev = wldev->dev->dev;
219
220 device_remove_file(dev, &dev_attr_shortpreamble);
221 device_remove_file(dev, &dev_attr_interference);
222}