via-pmu-led.c

Go to the documentation of this file.

/*
 * via-pmu LED class device
 *
 * Copyright 2006 Johannes Berg <[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, 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 <asm/prom.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_IDE
    .default_trigger = "ide-disk",
#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 == NULL) {
        of_node_put(dt);
        return -ENODEV;
    }
    if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
        strncmp(model, "iBook", strlen("iBook")) != 0 &&
        strcmp(model, "PowerMac7,2") != 0 &&
        strcmp(model, "PowerMac7,3") != 0) {
        of_node_put(dt);
        /* ignore */
        return -ENODEV;
    }
    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);
}

late_initcall(via_pmu_led_init);