LXR linux/drivers/macintosh/via-pmu-led.c

   1/*
   2 * via-pmu LED class device
   3 *
   4 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful, but
  12 * WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  14 * NON INFRINGEMENT.  See the GNU General Public License for more
  15 * details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  20 *
  21 */
  22#include <linux/types.h>
  23#include <linux/kernel.h>
  24#include <linux/device.h>
  25#include <linux/leds.h>
  26#include <linux/adb.h>
  27#include <linux/pmu.h>
  28#include <asm/prom.h>
  29
  30static spinlock_t pmu_blink_lock;
  31static struct adb_request pmu_blink_req;
  32/* -1: no change, 0: request off, 1: request on */
  33static int requested_change;
  34
  35static void pmu_req_done(struct adb_request * req)
  36{
  37        unsigned long flags;
  38
  39        spin_lock_irqsave(&pmu_blink_lock, flags);
  40        /* if someone requested a change in the meantime
  41         * (we only see the last one which is fine)
  42         * then apply it now */
  43        if (requested_change != -1 && !pmu_sys_suspended)
  44                pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
  45        /* reset requested change */
  46        requested_change = -1;
  47        spin_unlock_irqrestore(&pmu_blink_lock, flags);
  48}
  49
  50static void pmu_led_set(struct led_classdev *led_cdev,
  51                        enum led_brightness brightness)
  52{
  53        unsigned long flags;
  54
  55        spin_lock_irqsave(&pmu_blink_lock, flags);
  56        switch (brightness) {
  57        case LED_OFF:
  58                requested_change = 0;
  59                break;
  60        case LED_FULL:
  61                requested_change = 1;
  62                break;
  63        default:
  64                goto out;
  65                break;
  66        }
  67        /* if request isn't done, then don't do anything */
  68        if (pmu_blink_req.complete && !pmu_sys_suspended)
  69                pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
  70 out:
  71        spin_unlock_irqrestore(&pmu_blink_lock, flags);
  72}
  73
  74static struct led_classdev pmu_led = {
  75        .name = "pmu-led::front",
  76#ifdef CONFIG_ADB_PMU_LED_DISK
  77        .default_trigger = "disk-activity",
  78#endif
  79        .brightness_set = pmu_led_set,
  80};
  81
  82static int __init via_pmu_led_init(void)
  83{
  84        struct device_node *dt;
  85        const char *model;
  86
  87        /* only do this on keylargo based models */
  88        if (pmu_get_model() != PMU_KEYLARGO_BASED)
  89                return -ENODEV;
  90
  91        dt = of_find_node_by_path("/");
  92        if (dt == NULL)
  93                return -ENODEV;
  94        model = of_get_property(dt, "model", NULL);
  95        if (model == NULL) {
  96                of_node_put(dt);
  97                return -ENODEV;
  98        }
  99        if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
 100            strncmp(model, "iBook", strlen("iBook")) != 0 &&
 101            strcmp(model, "PowerMac7,2") != 0 &&
 102            strcmp(model, "PowerMac7,3") != 0) {
 103                of_node_put(dt);
 104                /* ignore */
 105                return -ENODEV;
 106        }
 107        of_node_put(dt);
 108
 109        spin_lock_init(&pmu_blink_lock);
 110        /* no outstanding req */
 111        pmu_blink_req.complete = 1;
 112        pmu_blink_req.done = pmu_req_done;
 113
 114        return led_classdev_register(NULL, &pmu_led);
 115}
 116
 117late_initcall(via_pmu_led_init);
 118