led.c

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/*
 * Atheros CARL9170 driver
 *
 * LED handling
 *
 * Copyright 2008, Johannes Berg <[email protected]>
 * Copyright 2009, 2010, Christian Lamparer <[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, see
 * http://www.gnu.org/licenses/.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *    Copyright (c) 2007-2008 Atheros Communications, Inc.
 *
 *    Permission to use, copy, modify, and/or distribute this software for any
 *    purpose with or without fee is hereby granted, provided that the above
 *    copyright notice and this permission notice appear in all copies.
 *
 *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "carl9170.h"
#include "cmd.h"

int carl9170_led_set_state(struct ar9170 *ar, const u32 led_state)
{
    return carl9170_write_reg(ar, AR9170_GPIO_REG_PORT_DATA, led_state);
}

int carl9170_led_init(struct ar9170 *ar)
{
    int err;

    /* disable LEDs */
    /* GPIO [0/1 mode: output, 2/3: input] */
    err = carl9170_write_reg(ar, AR9170_GPIO_REG_PORT_TYPE, 3);
    if (err)
        goto out;

    /* GPIO 0/1 value: off */
    err = carl9170_led_set_state(ar, 0);

out:
    return err;
}

#ifdef CONFIG_CARL9170_LEDS
static void carl9170_led_update(struct work_struct *work)
{
    struct ar9170 *ar = container_of(work, struct ar9170, led_work.work);
    int i, tmp = 300, blink_delay = 1000;
    u32 led_val = 0;
    bool rerun = false;

    if (!IS_ACCEPTING_CMD(ar))
        return;

    mutex_lock(&ar->mutex);
    for (i = 0; i < AR9170_NUM_LEDS; i++) {
        if (ar->leds[i].registered) {
            if (ar->leds[i].last_state ||
                ar->leds[i].toggled) {

                if (ar->leds[i].toggled)
                    tmp = 70 + 200 / (ar->leds[i].toggled);

                if (tmp < blink_delay)
                    blink_delay = tmp;

                led_val |= 1 << i;
                ar->leds[i].toggled = 0;
                rerun = true;
            }
        }
    }

    carl9170_led_set_state(ar, led_val);
    mutex_unlock(&ar->mutex);

    if (!rerun)
        return;

    ieee80211_queue_delayed_work(ar->hw,
                     &ar->led_work,
                     msecs_to_jiffies(blink_delay));
}

static void carl9170_led_set_brightness(struct led_classdev *led,
                    enum led_brightness brightness)
{
    struct carl9170_led *arl = container_of(led, struct carl9170_led, l);
    struct ar9170 *ar = arl->ar;

    if (!arl->registered)
        return;

    if (arl->last_state != !!brightness) {
        arl->toggled++;
        arl->last_state = !!brightness;
    }

    if (likely(IS_ACCEPTING_CMD(ar) && arl->toggled))
        ieee80211_queue_delayed_work(ar->hw, &ar->led_work, HZ / 10);
}

static int carl9170_led_register_led(struct ar9170 *ar, int i, char *name,
                     char *trigger)
{
    int err;

    snprintf(ar->leds[i].name, sizeof(ar->leds[i].name),
         "carl9170-%s::%s", wiphy_name(ar->hw->wiphy), name);

    ar->leds[i].ar = ar;
    ar->leds[i].l.name = ar->leds[i].name;
    ar->leds[i].l.brightness_set = carl9170_led_set_brightness;
    ar->leds[i].l.brightness = 0;
    ar->leds[i].l.default_trigger = trigger;

    err = led_classdev_register(wiphy_dev(ar->hw->wiphy),
                    &ar->leds[i].l);
    if (err) {
        wiphy_err(ar->hw->wiphy, "failed to register %s LED (%d).\n",
            ar->leds[i].name, err);
    } else {
        ar->leds[i].registered = true;
    }

    return err;
}

void carl9170_led_unregister(struct ar9170 *ar)
{
    int i;

    for (i = 0; i < AR9170_NUM_LEDS; i++)
        if (ar->leds[i].registered) {
            led_classdev_unregister(&ar->leds[i].l);
            ar->leds[i].registered = false;
            ar->leds[i].toggled = 0;
        }

    cancel_delayed_work_sync(&ar->led_work);
}

int carl9170_led_register(struct ar9170 *ar)
{
    int err;

    INIT_DELAYED_WORK(&ar->led_work, carl9170_led_update);

    err = carl9170_led_register_led(ar, 0, "tx",
                    ieee80211_get_tx_led_name(ar->hw));
    if (err)
        goto fail;

    if (ar->features & CARL9170_ONE_LED)
        return 0;

    err = carl9170_led_register_led(ar, 1, "assoc",
                    ieee80211_get_assoc_led_name(ar->hw));
    if (err)
        goto fail;

    return 0;

fail:
    carl9170_led_unregister(ar);
    return err;
}

#endif /* CONFIG_CARL9170_LEDS */