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 <linux/capability.h>
  27 #include <linux/io.h>
  28
  29 #include "b43.h"
  30 #include "sysfs.h"
  31 #include "main.h"
  32 #include "phy.h"
  33
  34 #define GENERIC_FILESIZE        64
  35
  36 static int get_integer(const char *buf, size_t count)
  37 {
  38         char tmp[10 + 1] = { 0 };
  39         int ret = -EINVAL;
  40
  41         if (count == 0)
  42                 goto out;
  43         count = min(count, (size_t) 10);
  44         memcpy(tmp, buf, count);
  45         ret = simple_strtol(tmp, NULL, 10);
  46       out:
  47         return ret;
  48 }
  49
  50 static int get_boolean(const char *buf, size_t count)
  51 {
  52         if (count != 0) {
  53                 if (buf[0] == '1')
  54                         return 1;
  55                 if (buf[0] == '0')
  56                         return 0;
  57                 if (count >= 4 && memcmp(buf, "true", 4) == 0)
  58                         return 1;
  59                 if (count >= 5 && memcmp(buf, "false", 5) == 0)
  60                         return 0;
  61                 if (count >= 3 && memcmp(buf, "yes", 3) == 0)
  62                         return 1;
  63                 if (count >= 2 && memcmp(buf, "no", 2) == 0)
  64                         return 0;
  65                 if (count >= 2 && memcmp(buf, "on", 2) == 0)
  66                         return 1;
  67                 if (count >= 3 && memcmp(buf, "off", 3) == 0)
  68                         return 0;
  69         }
  70         return -EINVAL;
  71 }
  72
  73 static ssize_t b43_attr_interfmode_show(struct device *dev,
  74                                         struct device_attribute *attr,
  75                                         char *buf)
  76 {
  77         struct b43_wldev *wldev = dev_to_b43_wldev(dev);
  78         ssize_t count = 0;
  79
  80         if (!capable(CAP_NET_ADMIN))
  81                 return -EPERM;
  82
  83         mutex_lock(&wldev->wl->mutex);
  84
  85         switch (wldev->phy.interfmode) {
  86         case B43_INTERFMODE_NONE:
  87                 count =
  88                     snprintf(buf, PAGE_SIZE,
  89                              "0 (No Interference Mitigation)\n");
  90                 break;
  91         case B43_INTERFMODE_NONWLAN:
  92                 count =
  93                     snprintf(buf, PAGE_SIZE,
  94                              "1 (Non-WLAN Interference Mitigation)\n");
  95                 break;
  96         case B43_INTERFMODE_MANUALWLAN:
  97                 count =
  98                     snprintf(buf, PAGE_SIZE,
  99                              "2 (WLAN Interference Mitigation)\n");
 100                 break;
 101         default:
 102                 B43_WARN_ON(1);
 103         }
 104
 105         mutex_unlock(&wldev->wl->mutex);
 106
 107         return count;
 108 }
 109
 110 static ssize_t b43_attr_interfmode_store(struct device *dev,
 111                                          struct device_attribute *attr,
 112                                          const char *buf, size_t count)
 113 {
 114         struct b43_wldev *wldev = dev_to_b43_wldev(dev);
 115         unsigned long flags;
 116         int err;
 117         int mode;
 118
 119         if (!capable(CAP_NET_ADMIN))
 120                 return -EPERM;
 121
 122         mode = get_integer(buf, count);
 123         switch (mode) {
 124         case 0:
 125                 mode = B43_INTERFMODE_NONE;
 126                 break;
 127         case 1:
 128                 mode = B43_INTERFMODE_NONWLAN;
 129                 break;
 130         case 2:
 131                 mode = B43_INTERFMODE_MANUALWLAN;
 132                 break;
 133         case 3:
 134                 mode = B43_INTERFMODE_AUTOWLAN;
 135                 break;
 136         default:
 137                 return -EINVAL;
 138         }
 139
 140         mutex_lock(&wldev->wl->mutex);
 141         spin_lock_irqsave(&wldev->wl->irq_lock, flags);
 142
 143         err = b43_radio_set_interference_mitigation(wldev, mode);
 144         if (err) {
 145                 b43err(wldev->wl, "Interference Mitigation not "
 146                        "supported by device\n");
 147         }
 148         mmiowb();
 149         spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
 150         mutex_unlock(&wldev->wl->mutex);
 151
 152         return err ? err : count;
 153 }
 154
 155 static DEVICE_ATTR(interference, 0644,
 156                    b43_attr_interfmode_show, b43_attr_interfmode_store);
 157
 158 static ssize_t b43_attr_preamble_show(struct device *dev,
 159                                       struct device_attribute *attr, char *buf)
 160 {
 161         struct b43_wldev *wldev = dev_to_b43_wldev(dev);
 162         ssize_t count;
 163
 164         if (!capable(CAP_NET_ADMIN))
 165                 return -EPERM;
 166
 167         mutex_lock(&wldev->wl->mutex);
 168
 169         if (wldev->short_preamble)
 170                 count =
 171                     snprintf(buf, PAGE_SIZE, "1 (Short Preamble enabled)\n");
 172         else
 173                 count =
 174                     snprintf(buf, PAGE_SIZE, "0 (Short Preamble disabled)\n");
 175
 176         mutex_unlock(&wldev->wl->mutex);
 177
 178         return count;
 179 }
 180
 181 static ssize_t b43_attr_preamble_store(struct device *dev,
 182                                        struct device_attribute *attr,
 183                                        const char *buf, size_t count)
 184 {
 185         struct b43_wldev *wldev = dev_to_b43_wldev(dev);
 186         unsigned long flags;
 187         int value;
 188
 189         if (!capable(CAP_NET_ADMIN))
 190                 return -EPERM;
 191
 192         value = get_boolean(buf, count);
 193         if (value < 0)
 194                 return value;
 195         mutex_lock(&wldev->wl->mutex);
 196         spin_lock_irqsave(&wldev->wl->irq_lock, flags);
 197
 198         wldev->short_preamble = !!value;
 199
 200         spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
 201         mutex_unlock(&wldev->wl->mutex);
 202
 203         return count;
 204 }
 205
 206 static DEVICE_ATTR(shortpreamble, 0644,
 207                    b43_attr_preamble_show, b43_attr_preamble_store);
 208
 209 int b43_sysfs_register(struct b43_wldev *wldev)
 210 {
 211         struct device *dev = wldev->dev->dev;
 212         int err;
 213
 214         B43_WARN_ON(b43_status(wldev) != B43_STAT_INITIALIZED);
 215
 216         err = device_create_file(dev, &dev_attr_interference);
 217         if (err)
 218                 goto out;
 219         err = device_create_file(dev, &dev_attr_shortpreamble);
 220         if (err)
 221                 goto err_remove_interfmode;
 222
 223       out:
 224         return err;
 225       err_remove_interfmode:
 226         device_remove_file(dev, &dev_attr_interference);
 227         goto out;
 228 }
 229
 230 void b43_sysfs_unregister(struct b43_wldev *wldev)
 231 {
 232         struct device *dev = wldev->dev->dev;
 233
 234         device_remove_file(dev, &dev_attr_shortpreamble);
 235         device_remove_file(dev, &dev_attr_interference);
 236 }