drivers/net/wireless/b43legacy/sysfs.c

   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         mmiowb();
 147         spin_unlock_irqrestore(&wldev->wl->irq_lock, flags);
 148         mutex_unlock(&wldev->wl->mutex);
 149
 150         return err ? err : count;
 151 }
 152
 153 static DEVICE_ATTR(interference, 0644,
 154                    b43legacy_attr_interfmode_show,
 155                    b43legacy_attr_interfmode_store);
 156
 157 static ssize_t b43legacy_attr_preamble_show(struct device *dev,
 158                                             struct device_attribute *attr,
 159                                             char *buf)
 160 {
 161         struct b43legacy_wldev *wldev = dev_to_b43legacy_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 = snprintf(buf, PAGE_SIZE, "1 (Short Preamble"
 171                                  " enabled)\n");
 172         else
 173                 count = snprintf(buf, PAGE_SIZE, "0 (Short Preamble"
 174                                  " disabled)\n");
 175
 176         mutex_unlock(&wldev->wl->mutex);
 177
 178         return count;
 179 }
 180
 181 static ssize_t b43legacy_attr_preamble_store(struct device *dev,
 182                                              struct device_attribute *attr,
 183                                              const char *buf, size_t count)
 184 {
 185         struct b43legacy_wldev *wldev = dev_to_b43legacy_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                    b43legacy_attr_preamble_show,
 208                    b43legacy_attr_preamble_store);
 209
 210 int b43legacy_sysfs_register(struct b43legacy_wldev *wldev)
 211 {
 212         struct device *dev = wldev->dev->dev;
 213         int err;
 214
 215         B43legacy_WARN_ON(b43legacy_status(wldev) !=
 216                           B43legacy_STAT_INITIALIZED);
 217
 218         err = device_create_file(dev, &dev_attr_interference);
 219         if (err)
 220                 goto out;
 221         err = device_create_file(dev, &dev_attr_shortpreamble);
 222         if (err)
 223                 goto err_remove_interfmode;
 224
 225 out:
 226         return err;
 227 err_remove_interfmode:
 228         device_remove_file(dev, &dev_attr_interference);
 229         goto out;
 230 }
 231
 232 void b43legacy_sysfs_unregister(struct b43legacy_wldev *wldev)
 233 {
 234         struct device *dev = wldev->dev->dev;
 235
 236         device_remove_file(dev, &dev_attr_shortpreamble);
 237         device_remove_file(dev, &dev_attr_interference);
 238 }