/*
 * via-pmu LED class device
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * 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, GOOD TITLE or
 * NON INFRINGEMENT.  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; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 *
 */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/leds.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/of.h>

static spinlock_t pmu_blink_lock;
static struct adb_request pmu_blink_req;
/* -1: no change, 0: request off, 1: request on */
static int requested_change;

static void pmu_req_done(struct adb_request * req)
{
        unsigned long flags;

        spin_lock_irqsave(&pmu_blink_lock, flags);
        /* if someone requested a change in the meantime
         * (we only see the last one which is fine)
         * then apply it now */
        if (requested_change != -1 && !pmu_sys_suspended)
                pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
        /* reset requested change */
        requested_change = -1;
        spin_unlock_irqrestore(&pmu_blink_lock, flags);
}

static void pmu_led_set(struct led_classdev *led_cdev,
                        enum led_brightness brightness)
{
        unsigned long flags;

        spin_lock_irqsave(&pmu_blink_lock, flags);
        switch (brightness) {
        case LED_OFF:
                requested_change = 0;
                break;
        case LED_FULL:
                requested_change = 1;
                break;
        default:
                goto out;
                break;
        }
        /* if request isn't done, then don't do anything */
        if (pmu_blink_req.complete && !pmu_sys_suspended)
                pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
 out:
        spin_unlock_irqrestore(&pmu_blink_lock, flags);
}

static struct led_classdev pmu_led = {
        .name = "pmu-led::front",
#ifdef CONFIG_ADB_PMU_LED_DISK
        .default_trigger = "disk-activity",
#endif
        .brightness_set = pmu_led_set,
};

static int __init via_pmu_led_init(void)
{
        struct device_node *dt;
        const char *model;

        /* only do this on keylargo based models */
        if (pmu_get_model() != PMU_KEYLARGO_BASED)
                return -ENODEV;

        dt = of_find_node_by_path("/");
        if (dt == NULL)
                return -ENODEV;
        model = of_get_property(dt, "model", NULL);
        if (!model)
                goto put_node;

        if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
            strncmp(model, "iBook", strlen("iBook")) != 0 &&
            strcmp(model, "PowerMac7,2") != 0 &&
            strcmp(model, "PowerMac7,3") != 0)
                goto put_node;

        of_node_put(dt);

        spin_lock_init(&pmu_blink_lock);
        /* no outstanding req */
        pmu_blink_req.complete = 1;
        pmu_blink_req.done = pmu_req_done;

        return led_classdev_register(NULL, &pmu_led);

put_node:
        of_node_put(dt);
        return -ENODEV;
}

late_initcall(via_pmu_led_init);