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via-pmu-led.c

/*
 * 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 <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-front-led",
#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)
            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);

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