drivers/net/wireless/b43/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 "b43.h"
  30 #include "leds.h"
  31 #include "rfkill.h"
  32
  33
  34 static void b43_led_turn_on(struct b43_wldev *dev, u8 led_index,
  35                             bool activelow)
  36 {
  37         struct b43_wl *wl = dev->wl;
  38         unsigned long flags;
  39         u16 ctl;
  40
  41         spin_lock_irqsave(&wl->leds_lock, flags);
  42         ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL);
  43         if (activelow)
  44                 ctl &= ~(1 << led_index);
  45         else
  46                 ctl |= (1 << led_index);
  47         b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl);
  48         spin_unlock_irqrestore(&wl->leds_lock, flags);
  49 }
  50
  51 static void b43_led_turn_off(struct b43_wldev *dev, u8 led_index,
  52                              bool activelow)
  53 {
  54         struct b43_wl *wl = dev->wl;
  55         unsigned long flags;
  56         u16 ctl;
  57
  58         spin_lock_irqsave(&wl->leds_lock, flags);
  59         ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL);
  60         if (activelow)
  61                 ctl |= (1 << led_index);
  62         else
  63                 ctl &= ~(1 << led_index);
  64         b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl);
  65         spin_unlock_irqrestore(&wl->leds_lock, flags);
  66 }
  67
  68 /* Callback from the LED subsystem. */
  69 static void b43_led_brightness_set(struct led_classdev *led_dev,
  70                                    enum led_brightness brightness)
  71 {
  72         struct b43_led *led = container_of(led_dev, struct b43_led, led_dev);
  73         struct b43_wldev *dev = led->dev;
  74         bool radio_enabled;
  75
  76         if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED))
  77                 return;
  78
  79         /* Checking the radio-enabled status here is slightly racy,
  80          * but we want to avoid the locking overhead and we don't care
  81          * whether the LED has the wrong state for a second. */
  82         radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);
  83
  84         if (brightness == LED_OFF || !radio_enabled)
  85                 b43_led_turn_off(dev, led->index, led->activelow);
  86         else
  87                 b43_led_turn_on(dev, led->index, led->activelow);
  88 }
  89
  90 static int b43_register_led(struct b43_wldev *dev, struct b43_led *led,
  91                             const char *name, const char *default_trigger,
  92                             u8 led_index, bool activelow)
  93 {
  94         int err;
  95
  96         b43_led_turn_off(dev, led_index, activelow);
  97         if (led->dev)
  98                 return -EEXIST;
  99         if (!default_trigger)
 100                 return -EINVAL;
 101         led->dev = dev;
 102         led->index = led_index;
 103         led->activelow = activelow;
 104         strncpy(led->name, name, sizeof(led->name));
 105
 106         led->led_dev.name = led->name;
 107         led->led_dev.default_trigger = default_trigger;
 108         led->led_dev.brightness_set = b43_led_brightness_set;
 109
 110         err = led_classdev_register(dev->dev->dev, &led->led_dev);
 111         if (err) {
 112                 b43warn(dev->wl, "LEDs: Failed to register %s\n", name);
 113                 led->dev = NULL;
 114                 return err;
 115         }
 116         return 0;
 117 }
 118
 119 static void b43_unregister_led(struct b43_led *led)
 120 {
 121         if (!led->dev)
 122                 return;
 123         led_classdev_unregister(&led->led_dev);
 124         b43_led_turn_off(led->dev, led->index, led->activelow);
 125         led->dev = NULL;
 126 }
 127
 128 static void b43_map_led(struct b43_wldev *dev,
 129                         u8 led_index,
 130                         enum b43_led_behaviour behaviour,
 131                         bool activelow)
 132 {
 133         struct ieee80211_hw *hw = dev->wl->hw;
 134         char name[B43_LED_MAX_NAME_LEN + 1];
 135
 136         /* Map the b43 specific LED behaviour value to the
 137          * generic LED triggers. */
 138         switch (behaviour) {
 139         case B43_LED_INACTIVE:
 140                 break;
 141         case B43_LED_OFF:
 142                 b43_led_turn_off(dev, led_index, activelow);
 143                 break;
 144         case B43_LED_ON:
 145                 b43_led_turn_on(dev, led_index, activelow);
 146                 break;
 147         case B43_LED_ACTIVITY:
 148         case B43_LED_TRANSFER:
 149         case B43_LED_APTRANSFER:
 150                 snprintf(name, sizeof(name),
 151                          "b43-%s::tx", wiphy_name(hw->wiphy));
 152                 b43_register_led(dev, &dev->led_tx, name,
 153                                  ieee80211_get_tx_led_name(hw),
 154                                  led_index, activelow);
 155                 snprintf(name, sizeof(name),
 156                          "b43-%s::rx", wiphy_name(hw->wiphy));
 157                 b43_register_led(dev, &dev->led_rx, name,
 158                                  ieee80211_get_rx_led_name(hw),
 159                                  led_index, activelow);
 160                 break;
 161         case B43_LED_RADIO_ALL:
 162         case B43_LED_RADIO_A:
 163         case B43_LED_RADIO_B:
 164         case B43_LED_MODE_BG:
 165                 snprintf(name, sizeof(name),
 166                          "b43-%s::radio", wiphy_name(hw->wiphy));
 167                 b43_register_led(dev, &dev->led_radio, name,
 168                                  ieee80211_get_radio_led_name(hw),
 169                                  led_index, activelow);
 170                 /* Sync the RF-kill LED state with radio and switch states. */
 171                 if (dev->phy.radio_on && b43_is_hw_radio_enabled(dev))
 172                         b43_led_turn_on(dev, led_index, activelow);
 173                 break;
 174         case B43_LED_WEIRD:
 175         case B43_LED_ASSOC:
 176                 snprintf(name, sizeof(name),
 177                          "b43-%s::assoc", wiphy_name(hw->wiphy));
 178                 b43_register_led(dev, &dev->led_assoc, name,
 179                                  ieee80211_get_assoc_led_name(hw),
 180                                  led_index, activelow);
 181                 break;
 182         default:
 183                 b43warn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
 184                         behaviour);
 185                 break;
 186         }
 187 }
 188
 189 void b43_leds_init(struct b43_wldev *dev)
 190 {
 191         struct ssb_bus *bus = dev->dev->bus;
 192         u8 sprom[4];
 193         int i;
 194         enum b43_led_behaviour behaviour;
 195         bool activelow;
 196
 197         sprom[0] = bus->sprom.gpio0;
 198         sprom[1] = bus->sprom.gpio1;
 199         sprom[2] = bus->sprom.gpio2;
 200         sprom[3] = bus->sprom.gpio3;
 201
 202         for (i = 0; i < 4; i++) {
 203                 if (sprom[i] == 0xFF) {
 204                         /* There is no LED information in the SPROM
 205                          * for this LED. Hardcode it here. */
 206                         activelow = 0;
 207                         switch (i) {
 208                         case 0:
 209                                 behaviour = B43_LED_ACTIVITY;
 210                                 activelow = 1;
 211                                 if (bus->boardinfo.vendor == PCI_VENDOR_ID_COMPAQ)
 212                                         behaviour = B43_LED_RADIO_ALL;
 213                                 break;
 214                         case 1:
 215                                 behaviour = B43_LED_RADIO_B;
 216                                 if (bus->boardinfo.vendor == PCI_VENDOR_ID_ASUSTEK)
 217                                         behaviour = B43_LED_ASSOC;
 218                                 break;
 219                         case 2:
 220                                 behaviour = B43_LED_RADIO_A;
 221                                 break;
 222                         case 3:
 223                                 behaviour = B43_LED_OFF;
 224                                 break;
 225                         default:
 226                                 B43_WARN_ON(1);
 227                                 return;
 228                         }
 229                 } else {
 230                         behaviour = sprom[i] & B43_LED_BEHAVIOUR;
 231                         activelow = !!(sprom[i] & B43_LED_ACTIVELOW);
 232                 }
 233                 b43_map_led(dev, i, behaviour, activelow);
 234         }
 235 }
 236
 237 void b43_leds_exit(struct b43_wldev *dev)
 238 {
 239         b43_unregister_led(&dev->led_tx);
 240         b43_unregister_led(&dev->led_rx);
 241         b43_unregister_led(&dev->led_assoc);
 242         b43_unregister_led(&dev->led_radio);
 243 }