drivers/net/wireless/b43/sysfs.c

   1 /*
   2
   3   Broadcom B43 wireless driver
   4
   5   SYSFS support routines
   6
   7   Copyright (c) 2006 Michael Buesch <mb@bu3sch.de>
   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 "b43.h"
  27 #include "sysfs.h"
  28 #include "main.h"
  29 #include "phy.h"
  30
  31 #include <linux/capability.h>
  32
  33 #define GENERIC_FILESIZE        64
  34
  35 static int get_integer(const char *buf, size_t count)
  36 {
  37         char tmp[10 + 1] = { 0 };
  38         int ret = -EINVAL;
  39
  40         if (count == 0)
  41                 goto out;
  42         count = min(count, (size_t) 10);
  43         memcpy(tmp, buf, count);
  44         ret = simple_strtol(tmp, NULL, 10);
  45       out:
  46         return ret;
  47 }
  48
  49 static int get_boolean(const char *buf, size_t count)
  50 {
  51         if (count != 0) {
  52                 if (buf[0] == '1')
  53                         return 1;
  54                 if (buf[0] == '0')
  55                         return 0;
  56                 if (count >= 4 && memcmp(buf, "true", 4) == 0)
  57                         return 1;
  58                 if (count >= 5 && memcmp(buf, "false", 5) == 0)
  59                         return 0;
  60                 if (count >= 3 && memcmp(buf, "yes", 3) == 0)
  61                         return 1;
  62                 if (count >= 2 && memcmp(buf, "no", 2) == 0)
  63                         return 0;
  64                 if (count >= 2 && memcmp(buf, "on", 2) == 0)
  65                         return 1;
  66                 if (count >= 3 && memcmp(buf, "off", 3) == 0)
  67                         return 0;
  68         }
  69         return -EINVAL;
  70 }
  71
  72 static ssize_t b43_attr_interfmode_show(struct device *dev,
  73                                         struct device_attribute *attr,
  74                                         char *buf)
  75 {
  76         struct b43_wldev *wldev = dev_to_b43_wldev(dev);
  77         ssize_t count = 0;
  78
  79         if (!capable(CAP_NET_ADMIN))
  80                 return -EPERM;
  81
  82         mutex_lock(&wldev->wl->mutex);
  83
  84         switch (wldev->phy.interfmode) {
  85         case B43_INTERFMODE_NONE:
  86                 count =
  87                     snprintf(buf, PAGE_SIZE,
  88                              "0 (No Interference Mitigation)\n");
  89                 break;
  90         case B43_INTERFMODE_NONWLAN:
  91                 count =
  92                     snprintf(buf, PAGE_SIZE,
  93                              "1 (Non-WLAN Interference Mitigation)\n");
  94                 break;
  95         case B43_INTERFMODE_MANUALWLAN:
  96                 count =
  97                     snprintf(buf, PAGE_SIZE,
  98                              "2 (WLAN Interference Mitigation)\n");
  99                 break;
 100         default:
 101                 B43_WARN_ON(1);
 102         }
 103
 104         mutex_unlock(&wldev->wl->mutex);
 105
 106         return count;
 107 }
 108
 109 static ssize_t b43_attr_interfmode_store(struct device *dev,
 110                                          struct device_attribute *attr,
 111                                          const char *buf, size_t count)
 112 {
 113         struct b43_wldev *wldev = dev_to_b43_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 = B43_INTERFMODE_NONE;
 125                 break;
 126         case 1:
 127                 mode = B43_INTERFMODE_NONWLAN;
 128                 break;
 129         case 2:
 130                 mode = B43_INTERFMODE_MANUALWLAN;
 131                 break;
 132         case 3:
 133                 mode = B43_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 = b43_radio_set_interference_mitigation(wldev, mode);
 143         if (err) {
 144                 b43err(wldev->wl, "Interference Mitigation not "
 145                        "supported by device\n");
 146         }
 147         mmiowb();
 148         spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
 149         mutex_unlock(&wldev->wl->mutex);
 150
 151         return err ? err : count;
 152 }
 153
 154 static DEVICE_ATTR(interference, 0644,
 155                    b43_attr_interfmode_show, b43_attr_interfmode_store);
 156
 157 static ssize_t b43_attr_preamble_show(struct device *dev,
 158                                       struct device_attribute *attr, char *buf)
 159 {
 160         struct b43_wldev *wldev = dev_to_b43_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 =
 170                     snprintf(buf, PAGE_SIZE, "1 (Short Preamble enabled)\n");
 171         else
 172                 count =
 173                     snprintf(buf, PAGE_SIZE, "0 (Short Preamble disabled)\n");
 174
 175         mutex_unlock(&wldev->wl->mutex);
 176
 177         return count;
 178 }
 179
 180 static ssize_t b43_attr_preamble_store(struct device *dev,
 181                                        struct device_attribute *attr,
 182                                        const char *buf, size_t count)
 183 {
 184         struct b43_wldev *wldev = dev_to_b43_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                    b43_attr_preamble_show, b43_attr_preamble_store);
 207
 208 int b43_sysfs_register(struct b43_wldev *wldev)
 209 {
 210         struct device *dev = wldev->dev->dev;
 211         int err;
 212
 213         B43_WARN_ON(b43_status(wldev) != B43_STAT_INITIALIZED);
 214
 215         err = device_create_file(dev, &dev_attr_interference);
 216         if (err)
 217                 goto out;
 218         err = device_create_file(dev, &dev_attr_shortpreamble);
 219         if (err)
 220                 goto err_remove_interfmode;
 221
 222       out:
 223         return err;
 224       err_remove_interfmode:
 225         device_remove_file(dev, &dev_attr_interference);
 226         goto out;
 227 }
 228
 229 void b43_sysfs_unregister(struct b43_wldev *wldev)
 230 {
 231         struct device *dev = wldev->dev->dev;
 232
 233         device_remove_file(dev, &dev_attr_shortpreamble);
 234         device_remove_file(dev, &dev_attr_interference);
 235 }