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
  32
  33 static void b43_led_turn_on(struct b43_wldev *dev, u8 led_index,
  34                             bool activelow)
  35 {
  36         struct b43_wl *wl = dev->wl;
  37         unsigned long flags;
  38         u16 ctl;
  39
  40         spin_lock_irqsave(&wl->leds_lock, flags);
  41         ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL);
  42         if (activelow)
  43                 ctl &= ~(1 << led_index);
  44         else
  45                 ctl |= (1 << led_index);
  46         b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl);
  47         spin_unlock_irqrestore(&wl->leds_lock, flags);
  48 }
  49
  50 static void b43_led_turn_off(struct b43_wldev *dev, u8 led_index,
  51                              bool activelow)
  52 {
  53         struct b43_wl *wl = dev->wl;
  54         unsigned long flags;
  55         u16 ctl;
  56
  57         spin_lock_irqsave(&wl->leds_lock, flags);
  58         ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL);
  59         if (activelow)
  60                 ctl |= (1 << led_index);
  61         else
  62                 ctl &= ~(1 << led_index);
  63         b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl);
  64         spin_unlock_irqrestore(&wl->leds_lock, flags);
  65 }
  66
  67 /* Callback from the LED subsystem. */
  68 static void b43_led_brightness_set(struct led_classdev *led_dev,
  69                                    enum led_brightness brightness)
  70 {
  71         struct b43_led *led = container_of(led_dev, struct b43_led, led_dev);
  72         struct b43_wldev *dev = led->dev;
  73         bool radio_enabled;
  74
  75         if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED))
  76                 return;
  77
  78         /* Checking the radio-enabled status here is slightly racy,
  79          * but we want to avoid the locking overhead and we don't care
  80          * whether the LED has the wrong state for a second. */
  81         radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);
  82
  83         if (brightness == LED_OFF || !radio_enabled)
  84                 b43_led_turn_off(dev, led->index, led->activelow);
  85         else
  86                 b43_led_turn_on(dev, led->index, led->activelow);
  87 }
  88
  89 static int b43_register_led(struct b43_wldev *dev, struct b43_led *led,
  90                             const char *name, char *default_trigger,
  91                             u8 led_index, bool activelow)
  92 {
  93         int err;
  94
  95         b43_led_turn_off(dev, led_index, activelow);
  96         if (led->dev)
  97                 return -EEXIST;
  98         if (!default_trigger)
  99                 return -EINVAL;
 100         led->dev = dev;
 101         led->index = led_index;
 102         led->activelow = activelow;
 103         strncpy(led->name, name, sizeof(led->name));
 104
 105         led->led_dev.name = led->name;
 106         led->led_dev.default_trigger = default_trigger;
 107         led->led_dev.brightness_set = b43_led_brightness_set;
 108
 109         err = led_classdev_register(dev->dev->dev, &led->led_dev);
 110         if (err) {
 111                 b43warn(dev->wl, "LEDs: Failed to register %s\n", name);
 112                 led->dev = NULL;
 113                 return err;
 114         }
 115         return 0;
 116 }
 117
 118 static void b43_unregister_led(struct b43_led *led)
 119 {
 120         if (!led->dev)
 121                 return;
 122         led_classdev_unregister(&led->led_dev);
 123         b43_led_turn_off(led->dev, led->index, led->activelow);
 124         led->dev = NULL;
 125 }
 126
 127 static void b43_map_led(struct b43_wldev *dev,
 128                         u8 led_index,
 129                         enum b43_led_behaviour behaviour,
 130                         bool activelow)
 131 {
 132         struct ieee80211_hw *hw = dev->wl->hw;
 133         char name[B43_LED_MAX_NAME_LEN + 1];
 134
 135         /* Map the b43 specific LED behaviour value to the
 136          * generic LED triggers. */
 137         switch (behaviour) {
 138         case B43_LED_INACTIVE:
 139                 break;
 140         case B43_LED_OFF:
 141                 b43_led_turn_off(dev, led_index, activelow);
 142                 break;
 143         case B43_LED_ON:
 144                 b43_led_turn_on(dev, led_index, activelow);
 145                 break;
 146         case B43_LED_ACTIVITY:
 147         case B43_LED_TRANSFER:
 148         case B43_LED_APTRANSFER:
 149                 snprintf(name, sizeof(name),
 150                          "b43-%s::tx", wiphy_name(hw->wiphy));
 151                 b43_register_led(dev, &dev->led_tx, name,
 152                                  ieee80211_get_tx_led_name(hw),
 153                                  led_index, activelow);
 154                 snprintf(name, sizeof(name),
 155                          "b43-%s::rx", wiphy_name(hw->wiphy));
 156                 b43_register_led(dev, &dev->led_rx, name,
 157                                  ieee80211_get_rx_led_name(hw),
 158                                  led_index, activelow);
 159                 break;
 160         case B43_LED_RADIO_ALL:
 161         case B43_LED_RADIO_A:
 162         case B43_LED_RADIO_B:
 163         case B43_LED_MODE_BG:
 164                 snprintf(name, sizeof(name),
 165                          "b43-%s::radio", wiphy_name(hw->wiphy));
 166                 b43_register_led(dev, &dev->led_radio, name,
 167                                  b43_rfkill_led_name(dev),
 168                                  led_index, activelow);
 169                 /* Sync the RF-kill LED state with the switch state. */
 170                 if (dev->radio_hw_enable)
 171                         b43_led_turn_on(dev, led_index, activelow);
 172                 break;
 173         case B43_LED_WEIRD:
 174         case B43_LED_ASSOC:
 175                 snprintf(name, sizeof(name),
 176                          "b43-%s::assoc", wiphy_name(hw->wiphy));
 177                 b43_register_led(dev, &dev->led_assoc, name,
 178                                  ieee80211_get_assoc_led_name(hw),
 179                                  led_index, activelow);
 180                 break;
 181         default:
 182                 b43warn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
 183                         behaviour);
 184                 break;
 185         }
 186 }
 187
 188 void b43_leds_init(struct b43_wldev *dev)
 189 {
 190         struct ssb_bus *bus = dev->dev->bus;
 191         u8 sprom[4];
 192         int i;
 193         enum b43_led_behaviour behaviour;
 194         bool activelow;
 195
 196         sprom[0] = bus->sprom.gpio0;
 197         sprom[1] = bus->sprom.gpio1;
 198         sprom[2] = bus->sprom.gpio2;
 199         sprom[3] = bus->sprom.gpio3;
 200
 201         for (i = 0; i < 4; i++) {
 202                 if (sprom[i] == 0xFF) {
 203                         /* There is no LED information in the SPROM
 204                          * for this LED. Hardcode it here. */
 205                         activelow = 0;
 206                         switch (i) {
 207                         case 0:
 208                                 behaviour = B43_LED_ACTIVITY;
 209                                 activelow = 1;
 210                                 if (bus->boardinfo.vendor == PCI_VENDOR_ID_COMPAQ)
 211                                         behaviour = B43_LED_RADIO_ALL;
 212                                 break;
 213                         case 1:
 214                                 behaviour = B43_LED_RADIO_B;
 215                                 if (bus->boardinfo.vendor == PCI_VENDOR_ID_ASUSTEK)
 216                                         behaviour = B43_LED_ASSOC;
 217                                 break;
 218                         case 2:
 219                                 behaviour = B43_LED_RADIO_A;
 220                                 break;
 221                         case 3:
 222                                 behaviour = B43_LED_OFF;
 223                                 break;
 224                         default:
 225                                 B43_WARN_ON(1);
 226                                 return;
 227                         }
 228                 } else {
 229                         behaviour = sprom[i] & B43_LED_BEHAVIOUR;
 230                         activelow = !!(sprom[i] & B43_LED_ACTIVELOW);
 231                 }
 232                 b43_map_led(dev, i, behaviour, activelow);
 233         }
 234 }
 235
 236 void b43_leds_exit(struct b43_wldev *dev)
 237 {
 238         b43_unregister_led(&dev->led_tx);
 239         b43_unregister_led(&dev->led_rx);
 240         b43_unregister_led(&dev->led_assoc);
 241         b43_unregister_led(&dev->led_radio);
 242 }