drivers/net/wireless/b43legacy/leds.c

   1 /*
   2
   3   Broadcom B43 wireless driver
   4   LED control
   5
   6   Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
   7   Copyright (c) 2005 Stefano Brivio <stefano.brivio@polimi.it>
   8   Copyright (c) 2005-2007 Michael Buesch <mb@bu3sch.de>
   9   Copyright (c) 2005 Danny van Dyk <kugelfang@gentoo.org>
  10   Copyright (c) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
  11
  12   This program is free software; you can redistribute it and/or modify
  13   it under the terms of the GNU General Public License as published by
  14   the Free Software Foundation; either version 2 of the License, or
  15   (at your option) any later version.
  16
  17   This program is distributed in the hope that it will be useful,
  18   but WITHOUT ANY WARRANTY; without even the implied warranty of
  19   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20   GNU General Public License for more details.
  21
  22   You should have received a copy of the GNU General Public License
  23   along with this program; see the file COPYING.  If not, write to
  24   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  25   Boston, MA 02110-1301, USA.
  26
  27 */
  28
  29 #include "b43legacy.h"
  30 #include "leds.h"
  31
  32
  33 static void b43legacy_led_turn_on(struct b43legacy_wldev *dev, u8 led_index,
  34                             bool activelow)
  35 {
  36         struct b43legacy_wl *wl = dev->wl;
  37         unsigned long flags;
  38         u16 ctl;
  39
  40         spin_lock_irqsave(&wl->leds_lock, flags);
  41         ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
  42         if (activelow)
  43                 ctl &= ~(1 << led_index);
  44         else
  45                 ctl |= (1 << led_index);
  46         b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
  47         spin_unlock_irqrestore(&wl->leds_lock, flags);
  48 }
  49
  50 static void b43legacy_led_turn_off(struct b43legacy_wldev *dev, u8 led_index,
  51                              bool activelow)
  52 {
  53         struct b43legacy_wl *wl = dev->wl;
  54         unsigned long flags;
  55         u16 ctl;
  56
  57         spin_lock_irqsave(&wl->leds_lock, flags);
  58         ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
  59         if (activelow)
  60                 ctl |= (1 << led_index);
  61         else
  62                 ctl &= ~(1 << led_index);
  63         b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
  64         spin_unlock_irqrestore(&wl->leds_lock, flags);
  65 }
  66
  67 /* Callback from the LED subsystem. */
  68 static void b43legacy_led_brightness_set(struct led_classdev *led_dev,
  69                                    enum led_brightness brightness)
  70 {
  71         struct b43legacy_led *led = container_of(led_dev, struct b43legacy_led,
  72                                     led_dev);
  73         struct b43legacy_wldev *dev = led->dev;
  74         bool radio_enabled;
  75
  76         /* Checking the radio-enabled status here is slightly racy,
  77          * but we want to avoid the locking overhead and we don't care
  78          * whether the LED has the wrong state for a second. */
  79         radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);
  80
  81         if (brightness == LED_OFF || !radio_enabled)
  82                 b43legacy_led_turn_off(dev, led->index, led->activelow);
  83         else
  84                 b43legacy_led_turn_on(dev, led->index, led->activelow);
  85 }
  86
  87 static int b43legacy_register_led(struct b43legacy_wldev *dev,
  88                                   struct b43legacy_led *led,
  89                                   const char *name, char *default_trigger,
  90                                   u8 led_index, bool activelow)
  91 {
  92         int err;
  93
  94         b43legacy_led_turn_off(dev, led_index, activelow);
  95         if (led->dev)
  96                 return -EEXIST;
  97         if (!default_trigger)
  98                 return -EINVAL;
  99         led->dev = dev;
 100         led->index = led_index;
 101         led->activelow = activelow;
 102         strncpy(led->name, name, sizeof(led->name));
 103
 104         led->led_dev.name = led->name;
 105         led->led_dev.default_trigger = default_trigger;
 106         led->led_dev.brightness_set = b43legacy_led_brightness_set;
 107
 108         err = led_classdev_register(dev->dev->dev, &led->led_dev);
 109         if (err) {
 110                 b43legacywarn(dev->wl, "LEDs: Failed to register %s\n", name);
 111                 led->dev = NULL;
 112                 return err;
 113         }
 114         return 0;
 115 }
 116
 117 static void b43legacy_unregister_led(struct b43legacy_led *led)
 118 {
 119         if (!led->dev)
 120                 return;
 121         led_classdev_unregister(&led->led_dev);
 122         b43legacy_led_turn_off(led->dev, led->index, led->activelow);
 123         led->dev = NULL;
 124 }
 125
 126 static void b43legacy_map_led(struct b43legacy_wldev *dev,
 127                         u8 led_index,
 128                         enum b43legacy_led_behaviour behaviour,
 129                         bool activelow)
 130 {
 131         struct ieee80211_hw *hw = dev->wl->hw;
 132         char name[B43legacy_LED_MAX_NAME_LEN + 1];
 133
 134         /* Map the b43 specific LED behaviour value to the
 135          * generic LED triggers. */
 136         switch (behaviour) {
 137         case B43legacy_LED_INACTIVE:
 138                 break;
 139         case B43legacy_LED_OFF:
 140                 b43legacy_led_turn_off(dev, led_index, activelow);
 141                 break;
 142         case B43legacy_LED_ON:
 143                 b43legacy_led_turn_on(dev, led_index, activelow);
 144                 break;
 145         case B43legacy_LED_ACTIVITY:
 146         case B43legacy_LED_TRANSFER:
 147         case B43legacy_LED_APTRANSFER:
 148                 snprintf(name, sizeof(name),
 149                          "b43legacy-%s:tx", wiphy_name(hw->wiphy));
 150                 b43legacy_register_led(dev, &dev->led_tx, name,
 151                                  ieee80211_get_tx_led_name(hw),
 152                                  led_index, activelow);
 153                 snprintf(name, sizeof(name),
 154                          "b43legacy-%s:rx", wiphy_name(hw->wiphy));
 155                 b43legacy_register_led(dev, &dev->led_rx, name,
 156                                  ieee80211_get_rx_led_name(hw),
 157                                  led_index, activelow);
 158                 break;
 159         case B43legacy_LED_RADIO_ALL:
 160         case B43legacy_LED_RADIO_A:
 161         case B43legacy_LED_RADIO_B:
 162         case B43legacy_LED_MODE_BG:
 163                 snprintf(name, sizeof(name),
 164                          "b43legacy-%s:radio", wiphy_name(hw->wiphy));
 165                 b43legacy_register_led(dev, &dev->led_radio, name,
 166                                  b43legacy_rfkill_led_name(dev),
 167                                  led_index, activelow);
 168                 break;
 169         case B43legacy_LED_WEIRD:
 170         case B43legacy_LED_ASSOC:
 171                 snprintf(name, sizeof(name),
 172                          "b43legacy-%s:assoc", wiphy_name(hw->wiphy));
 173                 b43legacy_register_led(dev, &dev->led_assoc, name,
 174                                  ieee80211_get_assoc_led_name(hw),
 175                                  led_index, activelow);
 176                 break;
 177         default:
 178                 b43legacywarn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
 179                         behaviour);
 180                 break;
 181         }
 182 }
 183
 184 void b43legacy_leds_init(struct b43legacy_wldev *dev)
 185 {
 186         struct ssb_bus *bus = dev->dev->bus;
 187         u8 sprom[4];
 188         int i;
 189         enum b43legacy_led_behaviour behaviour;
 190         bool activelow;
 191
 192         sprom[0] = bus->sprom.gpio0;
 193         sprom[1] = bus->sprom.gpio1;
 194         sprom[2] = bus->sprom.gpio2;
 195         sprom[3] = bus->sprom.gpio3;
 196
 197         for (i = 0; i < 4; i++) {
 198                 if (sprom[i] == 0xFF) {
 199                         /* There is no LED information in the SPROM
 200                          * for this LED. Hardcode it here. */
 201                         activelow = 0;
 202                         switch (i) {
 203                         case 0:
 204                                 behaviour = B43legacy_LED_ACTIVITY;
 205                                 activelow = 1;
 206                                 if (bus->boardinfo.vendor == PCI_VENDOR_ID_COMPAQ)
 207                                         behaviour = B43legacy_LED_RADIO_ALL;
 208                                 break;
 209                         case 1:
 210                                 behaviour = B43legacy_LED_RADIO_B;
 211                                 if (bus->boardinfo.vendor == PCI_VENDOR_ID_ASUSTEK)
 212                                         behaviour = B43legacy_LED_ASSOC;
 213                                 break;
 214                         case 2:
 215                                 behaviour = B43legacy_LED_RADIO_A;
 216                                 break;
 217                         case 3:
 218                                 behaviour = B43legacy_LED_OFF;
 219                                 break;
 220                         default:
 221                                 B43legacy_WARN_ON(1);
 222                                 return;
 223                         }
 224                 } else {
 225                         behaviour = sprom[i] & B43legacy_LED_BEHAVIOUR;
 226                         activelow = !!(sprom[i] & B43legacy_LED_ACTIVELOW);
 227                 }
 228                 b43legacy_map_led(dev, i, behaviour, activelow);
 229         }
 230 }
 231
 232 void b43legacy_leds_exit(struct b43legacy_wldev *dev)
 233 {
 234         b43legacy_unregister_led(&dev->led_tx);
 235         b43legacy_unregister_led(&dev->led_rx);
 236         b43legacy_unregister_led(&dev->led_assoc);
 237 }