linux/drivers/net/wireless/broadcom/b43legacy/leds.c
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   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 <m@bues.ch>
   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#include "rfkill.h"
  32
  33
  34static void b43legacy_led_turn_on(struct b43legacy_wldev *dev, u8 led_index,
  35                            bool activelow)
  36{
  37        struct b43legacy_wl *wl = dev->wl;
  38        unsigned long flags;
  39        u16 ctl;
  40
  41        spin_lock_irqsave(&wl->leds_lock, flags);
  42        ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
  43        if (activelow)
  44                ctl &= ~(1 << led_index);
  45        else
  46                ctl |= (1 << led_index);
  47        b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
  48        spin_unlock_irqrestore(&wl->leds_lock, flags);
  49}
  50
  51static void b43legacy_led_turn_off(struct b43legacy_wldev *dev, u8 led_index,
  52                             bool activelow)
  53{
  54        struct b43legacy_wl *wl = dev->wl;
  55        unsigned long flags;
  56        u16 ctl;
  57
  58        spin_lock_irqsave(&wl->leds_lock, flags);
  59        ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
  60        if (activelow)
  61                ctl |= (1 << led_index);
  62        else
  63                ctl &= ~(1 << led_index);
  64        b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
  65        spin_unlock_irqrestore(&wl->leds_lock, flags);
  66}
  67
  68/* Callback from the LED subsystem. */
  69static void b43legacy_led_brightness_set(struct led_classdev *led_dev,
  70                                   enum led_brightness brightness)
  71{
  72        struct b43legacy_led *led = container_of(led_dev, struct b43legacy_led,
  73                                    led_dev);
  74        struct b43legacy_wldev *dev = led->dev;
  75        bool radio_enabled;
  76
  77        /* Checking the radio-enabled status here is slightly racy,
  78         * but we want to avoid the locking overhead and we don't care
  79         * whether the LED has the wrong state for a second. */
  80        radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);
  81
  82        if (brightness == LED_OFF || !radio_enabled)
  83                b43legacy_led_turn_off(dev, led->index, led->activelow);
  84        else
  85                b43legacy_led_turn_on(dev, led->index, led->activelow);
  86}
  87
  88static int b43legacy_register_led(struct b43legacy_wldev *dev,
  89                                  struct b43legacy_led *led,
  90                                  const char *name,
  91                                  const char *default_trigger,
  92                                  u8 led_index, bool activelow)
  93{
  94        int err;
  95
  96        b43legacy_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 = b43legacy_led_brightness_set;
 109
 110        err = led_classdev_register(dev->dev->dev, &led->led_dev);
 111        if (err) {
 112                b43legacywarn(dev->wl, "LEDs: Failed to register %s\n", name);
 113                led->dev = NULL;
 114                return err;
 115        }
 116        return 0;
 117}
 118
 119static void b43legacy_unregister_led(struct b43legacy_led *led)
 120{
 121        if (!led->dev)
 122                return;
 123        led_classdev_unregister(&led->led_dev);
 124        b43legacy_led_turn_off(led->dev, led->index, led->activelow);
 125        led->dev = NULL;
 126}
 127
 128static void b43legacy_map_led(struct b43legacy_wldev *dev,
 129                        u8 led_index,
 130                        enum b43legacy_led_behaviour behaviour,
 131                        bool activelow)
 132{
 133        struct ieee80211_hw *hw = dev->wl->hw;
 134        char name[B43legacy_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 B43legacy_LED_INACTIVE:
 140                break;
 141        case B43legacy_LED_OFF:
 142                b43legacy_led_turn_off(dev, led_index, activelow);
 143                break;
 144        case B43legacy_LED_ON:
 145                b43legacy_led_turn_on(dev, led_index, activelow);
 146                break;
 147        case B43legacy_LED_ACTIVITY:
 148        case B43legacy_LED_TRANSFER:
 149        case B43legacy_LED_APTRANSFER:
 150                snprintf(name, sizeof(name),
 151                         "b43legacy-%s::tx", wiphy_name(hw->wiphy));
 152                b43legacy_register_led(dev, &dev->led_tx, name,
 153                                 ieee80211_get_tx_led_name(hw),
 154                                 led_index, activelow);
 155                snprintf(name, sizeof(name),
 156                         "b43legacy-%s::rx", wiphy_name(hw->wiphy));
 157                b43legacy_register_led(dev, &dev->led_rx, name,
 158                                 ieee80211_get_rx_led_name(hw),
 159                                 led_index, activelow);
 160                break;
 161        case B43legacy_LED_RADIO_ALL:
 162        case B43legacy_LED_RADIO_A:
 163        case B43legacy_LED_RADIO_B:
 164        case B43legacy_LED_MODE_BG:
 165                snprintf(name, sizeof(name),
 166                         "b43legacy-%s::radio", wiphy_name(hw->wiphy));
 167                b43legacy_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 && b43legacy_is_hw_radio_enabled(dev))
 172                        b43legacy_led_turn_on(dev, led_index, activelow);
 173                break;
 174        case B43legacy_LED_WEIRD:
 175        case B43legacy_LED_ASSOC:
 176                snprintf(name, sizeof(name),
 177                         "b43legacy-%s::assoc", wiphy_name(hw->wiphy));
 178                b43legacy_register_led(dev, &dev->led_assoc, name,
 179                                 ieee80211_get_assoc_led_name(hw),
 180                                 led_index, activelow);
 181                break;
 182        default:
 183                b43legacywarn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
 184                        behaviour);
 185                break;
 186        }
 187}
 188
 189void b43legacy_leds_init(struct b43legacy_wldev *dev)
 190{
 191        struct ssb_bus *bus = dev->dev->bus;
 192        u8 sprom[4];
 193        int i;
 194        enum b43legacy_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 = false;
 207                        switch (i) {
 208                        case 0:
 209                                behaviour = B43legacy_LED_ACTIVITY;
 210                                activelow = true;
 211                                if (bus->boardinfo.vendor == PCI_VENDOR_ID_COMPAQ)
 212                                        behaviour = B43legacy_LED_RADIO_ALL;
 213                                break;
 214                        case 1:
 215                                behaviour = B43legacy_LED_RADIO_B;
 216                                if (bus->boardinfo.vendor == PCI_VENDOR_ID_ASUSTEK)
 217                                        behaviour = B43legacy_LED_ASSOC;
 218                                break;
 219                        case 2:
 220                                behaviour = B43legacy_LED_RADIO_A;
 221                                break;
 222                        case 3:
 223                                behaviour = B43legacy_LED_OFF;
 224                                break;
 225                        default:
 226                                B43legacy_WARN_ON(1);
 227                                return;
 228                        }
 229                } else {
 230                        behaviour = sprom[i] & B43legacy_LED_BEHAVIOUR;
 231                        activelow = !!(sprom[i] & B43legacy_LED_ACTIVELOW);
 232                }
 233                b43legacy_map_led(dev, i, behaviour, activelow);
 234        }
 235}
 236
 237void b43legacy_leds_exit(struct b43legacy_wldev *dev)
 238{
 239        b43legacy_unregister_led(&dev->led_tx);
 240        b43legacy_unregister_led(&dev->led_rx);
 241        b43legacy_unregister_led(&dev->led_assoc);
 242        b43legacy_unregister_led(&dev->led_radio);
 243}
 244