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_IDE
 77	.default_trigger = "ide-disk",
 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);