cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

via-pmu-led.c (3223B)

      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 <linux/of.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);