leds.c

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/*

  Broadcom B43 wireless driver
  LED control

  Copyright (c) 2005 Martin Langer <[email protected]>,
  Copyright (c) 2005 Stefano Brivio <[email protected]>
  Copyright (c) 2005-2007 Michael Buesch <[email protected]>
  Copyright (c) 2005 Danny van Dyk <[email protected]>
  Copyright (c) 2005 Andreas Jaggi <[email protected]>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include "b43legacy.h"
#include "leds.h"
#include "rfkill.h"


static void b43legacy_led_turn_on(struct b43legacy_wldev *dev, u8 led_index,
                bool activelow)
{
    struct b43legacy_wl *wl = dev->wl;
    unsigned long flags;
    u16 ctl;

    spin_lock_irqsave(&wl->leds_lock, flags);
    ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
    if (activelow)
        ctl &= ~(1 << led_index);
    else
        ctl |= (1 << led_index);
    b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
    spin_unlock_irqrestore(&wl->leds_lock, flags);
}

static void b43legacy_led_turn_off(struct b43legacy_wldev *dev, u8 led_index,
                 bool activelow)
{
    struct b43legacy_wl *wl = dev->wl;
    unsigned long flags;
    u16 ctl;

    spin_lock_irqsave(&wl->leds_lock, flags);
    ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
    if (activelow)
        ctl |= (1 << led_index);
    else
        ctl &= ~(1 << led_index);
    b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
    spin_unlock_irqrestore(&wl->leds_lock, flags);
}

/* Callback from the LED subsystem. */
static void b43legacy_led_brightness_set(struct led_classdev *led_dev,
                   enum led_brightness brightness)
{
    struct b43legacy_led *led = container_of(led_dev, struct b43legacy_led,
                    led_dev);
    struct b43legacy_wldev *dev = led->dev;
    bool radio_enabled;

    /* Checking the radio-enabled status here is slightly racy,
     * but we want to avoid the locking overhead and we don't care
     * whether the LED has the wrong state for a second. */
    radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);

    if (brightness == LED_OFF || !radio_enabled)
        b43legacy_led_turn_off(dev, led->index, led->activelow);
    else
        b43legacy_led_turn_on(dev, led->index, led->activelow);
}

static int b43legacy_register_led(struct b43legacy_wldev *dev,
                  struct b43legacy_led *led,
                  const char *name,
                  const char *default_trigger,
                  u8 led_index, bool activelow)
{
    int err;

    b43legacy_led_turn_off(dev, led_index, activelow);
    if (led->dev)
        return -EEXIST;
    if (!default_trigger)
        return -EINVAL;
    led->dev = dev;
    led->index = led_index;
    led->activelow = activelow;
    strncpy(led->name, name, sizeof(led->name));

    led->led_dev.name = led->name;
    led->led_dev.default_trigger = default_trigger;
    led->led_dev.brightness_set = b43legacy_led_brightness_set;

    err = led_classdev_register(dev->dev->dev, &led->led_dev);
    if (err) {
        b43legacywarn(dev->wl, "LEDs: Failed to register %s\n", name);
        led->dev = NULL;
        return err;
    }
    return 0;
}

static void b43legacy_unregister_led(struct b43legacy_led *led)
{
    if (!led->dev)
        return;
    led_classdev_unregister(&led->led_dev);
    b43legacy_led_turn_off(led->dev, led->index, led->activelow);
    led->dev = NULL;
}

static void b43legacy_map_led(struct b43legacy_wldev *dev,
            u8 led_index,
            enum b43legacy_led_behaviour behaviour,
            bool activelow)
{
    struct ieee80211_hw *hw = dev->wl->hw;
    char name[B43legacy_LED_MAX_NAME_LEN + 1];

    /* Map the b43 specific LED behaviour value to the
     * generic LED triggers. */
    switch (behaviour) {
    case B43legacy_LED_INACTIVE:
        break;
    case B43legacy_LED_OFF:
        b43legacy_led_turn_off(dev, led_index, activelow);
        break;
    case B43legacy_LED_ON:
        b43legacy_led_turn_on(dev, led_index, activelow);
        break;
    case B43legacy_LED_ACTIVITY:
    case B43legacy_LED_TRANSFER:
    case B43legacy_LED_APTRANSFER:
        snprintf(name, sizeof(name),
             "b43legacy-%s::tx", wiphy_name(hw->wiphy));
        b43legacy_register_led(dev, &dev->led_tx, name,
                 ieee80211_get_tx_led_name(hw),
                 led_index, activelow);
        snprintf(name, sizeof(name),
             "b43legacy-%s::rx", wiphy_name(hw->wiphy));
        b43legacy_register_led(dev, &dev->led_rx, name,
                 ieee80211_get_rx_led_name(hw),
                 led_index, activelow);
        break;
    case B43legacy_LED_RADIO_ALL:
    case B43legacy_LED_RADIO_A:
    case B43legacy_LED_RADIO_B:
    case B43legacy_LED_MODE_BG:
        snprintf(name, sizeof(name),
             "b43legacy-%s::radio", wiphy_name(hw->wiphy));
        b43legacy_register_led(dev, &dev->led_radio, name,
                 ieee80211_get_radio_led_name(hw),
                 led_index, activelow);
        /* Sync the RF-kill LED state with radio and switch states. */
        if (dev->phy.radio_on && b43legacy_is_hw_radio_enabled(dev))
            b43legacy_led_turn_on(dev, led_index, activelow);
        break;
    case B43legacy_LED_WEIRD:
    case B43legacy_LED_ASSOC:
        snprintf(name, sizeof(name),
             "b43legacy-%s::assoc", wiphy_name(hw->wiphy));
        b43legacy_register_led(dev, &dev->led_assoc, name,
                 ieee80211_get_assoc_led_name(hw),
                 led_index, activelow);
        break;
    default:
        b43legacywarn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
            behaviour);
        break;
    }
}

void b43legacy_leds_init(struct b43legacy_wldev *dev)
{
    struct ssb_bus *bus = dev->dev->bus;
    u8 sprom[4];
    int i;
    enum b43legacy_led_behaviour behaviour;
    bool activelow;

    sprom[0] = bus->sprom.gpio0;
    sprom[1] = bus->sprom.gpio1;
    sprom[2] = bus->sprom.gpio2;
    sprom[3] = bus->sprom.gpio3;

    for (i = 0; i < 4; i++) {
        if (sprom[i] == 0xFF) {
            /* There is no LED information in the SPROM
             * for this LED. Hardcode it here. */
            activelow = false;
            switch (i) {
            case 0:
                behaviour = B43legacy_LED_ACTIVITY;
                activelow = true;
                if (bus->boardinfo.vendor == PCI_VENDOR_ID_COMPAQ)
                    behaviour = B43legacy_LED_RADIO_ALL;
                break;
            case 1:
                behaviour = B43legacy_LED_RADIO_B;
                if (bus->boardinfo.vendor == PCI_VENDOR_ID_ASUSTEK)
                    behaviour = B43legacy_LED_ASSOC;
                break;
            case 2:
                behaviour = B43legacy_LED_RADIO_A;
                break;
            case 3:
                behaviour = B43legacy_LED_OFF;
                break;
            default:
                B43legacy_WARN_ON(1);
                return;
            }
        } else {
            behaviour = sprom[i] & B43legacy_LED_BEHAVIOUR;
            activelow = !!(sprom[i] & B43legacy_LED_ACTIVELOW);
        }
        b43legacy_map_led(dev, i, behaviour, activelow);
    }
}

void b43legacy_leds_exit(struct b43legacy_wldev *dev)
{
    b43legacy_unregister_led(&dev->led_tx);
    b43legacy_unregister_led(&dev->led_rx);
    b43legacy_unregister_led(&dev->led_assoc);
    b43legacy_unregister_led(&dev->led_radio);
}