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 "b43.h"
#include "leds.h"
#include "rfkill.h"


static void b43_led_turn_on(struct b43_wldev *dev, u8 led_index,
                bool activelow)
{
    u16 ctl;

    ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL);
    if (activelow)
        ctl &= ~(1 << led_index);
    else
        ctl |= (1 << led_index);
    b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl);
}

static void b43_led_turn_off(struct b43_wldev *dev, u8 led_index,
                 bool activelow)
{
    u16 ctl;

    ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL);
    if (activelow)
        ctl |= (1 << led_index);
    else
        ctl &= ~(1 << led_index);
    b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl);
}

static void b43_led_update(struct b43_wldev *dev,
               struct b43_led *led)
{
    bool radio_enabled;
    bool turn_on;

    if (!led->wl)
        return;

    radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);

    /* The led->state read is racy, but we don't care. In case we raced
     * with the brightness_set handler, we will be called again soon
     * to fixup our state. */
    if (radio_enabled)
        turn_on = atomic_read(&led->state) != LED_OFF;
    else
        turn_on = false;
    if (turn_on == led->hw_state)
        return;
    led->hw_state = turn_on;

    if (turn_on)
        b43_led_turn_on(dev, led->index, led->activelow);
    else
        b43_led_turn_off(dev, led->index, led->activelow);
}

static void b43_leds_work(struct work_struct *work)
{
    struct b43_leds *leds = container_of(work, struct b43_leds, work);
    struct b43_wl *wl = container_of(leds, struct b43_wl, leds);
    struct b43_wldev *dev;

    mutex_lock(&wl->mutex);
    dev = wl->current_dev;
    if (unlikely(!dev || b43_status(dev) < B43_STAT_STARTED))
        goto out_unlock;

    b43_led_update(dev, &wl->leds.led_tx);
    b43_led_update(dev, &wl->leds.led_rx);
    b43_led_update(dev, &wl->leds.led_radio);
    b43_led_update(dev, &wl->leds.led_assoc);

out_unlock:
    mutex_unlock(&wl->mutex);
}

/* Callback from the LED subsystem. */
static void b43_led_brightness_set(struct led_classdev *led_dev,
                   enum led_brightness brightness)
{
    struct b43_led *led = container_of(led_dev, struct b43_led, led_dev);
    struct b43_wl *wl = led->wl;

    if (likely(!wl->leds.stop)) {
        atomic_set(&led->state, brightness);
        ieee80211_queue_work(wl->hw, &wl->leds.work);
    }
}

static int b43_register_led(struct b43_wldev *dev, struct b43_led *led,
                const char *name, const char *default_trigger,
                u8 led_index, bool activelow)
{
    int err;

    if (led->wl)
        return -EEXIST;
    if (!default_trigger)
        return -EINVAL;
    led->wl = dev->wl;
    led->index = led_index;
    led->activelow = activelow;
    strncpy(led->name, name, sizeof(led->name));
    atomic_set(&led->state, 0);

    led->led_dev.name = led->name;
    led->led_dev.default_trigger = default_trigger;
    led->led_dev.brightness_set = b43_led_brightness_set;

    err = led_classdev_register(dev->dev->dev, &led->led_dev);
    if (err) {
        b43warn(dev->wl, "LEDs: Failed to register %s\n", name);
        led->wl = NULL;
        return err;
    }

    return 0;
}

static void b43_unregister_led(struct b43_led *led)
{
    if (!led->wl)
        return;
    led_classdev_unregister(&led->led_dev);
    led->wl = NULL;
}

static void b43_map_led(struct b43_wldev *dev,
            u8 led_index,
            enum b43_led_behaviour behaviour,
            bool activelow)
{
    struct ieee80211_hw *hw = dev->wl->hw;
    char name[B43_LED_MAX_NAME_LEN + 1];

    /* Map the b43 specific LED behaviour value to the
     * generic LED triggers. */
    switch (behaviour) {
    case B43_LED_INACTIVE:
    case B43_LED_OFF:
    case B43_LED_ON:
        break;
    case B43_LED_ACTIVITY:
    case B43_LED_TRANSFER:
    case B43_LED_APTRANSFER:
        snprintf(name, sizeof(name),
             "b43-%s::tx", wiphy_name(hw->wiphy));
        b43_register_led(dev, &dev->wl->leds.led_tx, name,
                 ieee80211_get_tx_led_name(hw),
                 led_index, activelow);
        snprintf(name, sizeof(name),
             "b43-%s::rx", wiphy_name(hw->wiphy));
        b43_register_led(dev, &dev->wl->leds.led_rx, name,
                 ieee80211_get_rx_led_name(hw),
                 led_index, activelow);
        break;
    case B43_LED_RADIO_ALL:
    case B43_LED_RADIO_A:
    case B43_LED_RADIO_B:
    case B43_LED_MODE_BG:
        snprintf(name, sizeof(name),
             "b43-%s::radio", wiphy_name(hw->wiphy));
        b43_register_led(dev, &dev->wl->leds.led_radio, name,
                 ieee80211_get_radio_led_name(hw),
                 led_index, activelow);
        break;
    case B43_LED_WEIRD:
    case B43_LED_ASSOC:
        snprintf(name, sizeof(name),
             "b43-%s::assoc", wiphy_name(hw->wiphy));
        b43_register_led(dev, &dev->wl->leds.led_assoc, name,
                 ieee80211_get_assoc_led_name(hw),
                 led_index, activelow);
        break;
    default:
        b43warn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
            behaviour);
        break;
    }
}

static void b43_led_get_sprominfo(struct b43_wldev *dev,
                  unsigned int led_index,
                  enum b43_led_behaviour *behaviour,
                  bool *activelow)
{
    u8 sprom[4];

    sprom[0] = dev->dev->bus_sprom->gpio0;
    sprom[1] = dev->dev->bus_sprom->gpio1;
    sprom[2] = dev->dev->bus_sprom->gpio2;
    sprom[3] = dev->dev->bus_sprom->gpio3;

    if (sprom[led_index] == 0xFF) {
        /* There is no LED information in the SPROM
         * for this LED. Hardcode it here. */
        *activelow = false;
        switch (led_index) {
        case 0:
            *behaviour = B43_LED_ACTIVITY;
            *activelow = true;
            if (dev->dev->board_vendor == PCI_VENDOR_ID_COMPAQ)
                *behaviour = B43_LED_RADIO_ALL;
            break;
        case 1:
            *behaviour = B43_LED_RADIO_B;
            if (dev->dev->board_vendor == PCI_VENDOR_ID_ASUSTEK)
                *behaviour = B43_LED_ASSOC;
            break;
        case 2:
            *behaviour = B43_LED_RADIO_A;
            break;
        case 3:
            *behaviour = B43_LED_OFF;
            break;
        default:
            *behaviour = B43_LED_OFF;
            B43_WARN_ON(1);
            return;
        }
    } else {
        *behaviour = sprom[led_index] & B43_LED_BEHAVIOUR;
        *activelow = !!(sprom[led_index] & B43_LED_ACTIVELOW);
    }
}

void b43_leds_init(struct b43_wldev *dev)
{
    struct b43_led *led;
    unsigned int i;
    enum b43_led_behaviour behaviour;
    bool activelow;

    /* Sync the RF-kill LED state (if we have one) with radio and switch states. */
    led = &dev->wl->leds.led_radio;
    if (led->wl) {
        if (dev->phy.radio_on && b43_is_hw_radio_enabled(dev)) {
            b43_led_turn_on(dev, led->index, led->activelow);
            led->hw_state = true;
            atomic_set(&led->state, 1);
        } else {
            b43_led_turn_off(dev, led->index, led->activelow);
            led->hw_state = false;
            atomic_set(&led->state, 0);
        }
    }

    /* Initialize TX/RX/ASSOC leds */
    led = &dev->wl->leds.led_tx;
    if (led->wl) {
        b43_led_turn_off(dev, led->index, led->activelow);
        led->hw_state = false;
        atomic_set(&led->state, 0);
    }
    led = &dev->wl->leds.led_rx;
    if (led->wl) {
        b43_led_turn_off(dev, led->index, led->activelow);
        led->hw_state = false;
        atomic_set(&led->state, 0);
    }
    led = &dev->wl->leds.led_assoc;
    if (led->wl) {
        b43_led_turn_off(dev, led->index, led->activelow);
        led->hw_state = false;
        atomic_set(&led->state, 0);
    }

    /* Initialize other LED states. */
    for (i = 0; i < B43_MAX_NR_LEDS; i++) {
        b43_led_get_sprominfo(dev, i, &behaviour, &activelow);
        switch (behaviour) {
        case B43_LED_OFF:
            b43_led_turn_off(dev, i, activelow);
            break;
        case B43_LED_ON:
            b43_led_turn_on(dev, i, activelow);
            break;
        default:
            /* Leave others as-is. */
            break;
        }
    }

    dev->wl->leds.stop = 0;
}

void b43_leds_exit(struct b43_wldev *dev)
{
    struct b43_leds *leds = &dev->wl->leds;

    b43_led_turn_off(dev, leds->led_tx.index, leds->led_tx.activelow);
    b43_led_turn_off(dev, leds->led_rx.index, leds->led_rx.activelow);
    b43_led_turn_off(dev, leds->led_assoc.index, leds->led_assoc.activelow);
    b43_led_turn_off(dev, leds->led_radio.index, leds->led_radio.activelow);
}

void b43_leds_stop(struct b43_wldev *dev)
{
    struct b43_leds *leds = &dev->wl->leds;

    leds->stop = 1;
    cancel_work_sync(&leds->work);
}

void b43_leds_register(struct b43_wldev *dev)
{
    unsigned int i;
    enum b43_led_behaviour behaviour;
    bool activelow;

    INIT_WORK(&dev->wl->leds.work, b43_leds_work);

    /* Register the LEDs to the LED subsystem. */
    for (i = 0; i < B43_MAX_NR_LEDS; i++) {
        b43_led_get_sprominfo(dev, i, &behaviour, &activelow);
        b43_map_led(dev, i, behaviour, activelow);
    }
}

void b43_leds_unregister(struct b43_wl *wl)
{
    struct b43_leds *leds = &wl->leds;

    b43_unregister_led(&leds->led_tx);
    b43_unregister_led(&leds->led_rx);
    b43_unregister_led(&leds->led_assoc);
    b43_unregister_led(&leds->led_radio);
}