118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/*
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* via-pmu LED class device
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*
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* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/leds.h>
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#include <linux/adb.h>
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#include <linux/pmu.h>
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#include <asm/prom.h>
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static spinlock_t pmu_blink_lock;
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static struct adb_request pmu_blink_req;
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/* -1: no change, 0: request off, 1: request on */
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static int requested_change;
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static void pmu_req_done(struct adb_request * req)
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{
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unsigned long flags;
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spin_lock_irqsave(&pmu_blink_lock, flags);
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/* if someone requested a change in the meantime
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* (we only see the last one which is fine)
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* then apply it now */
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if (requested_change != -1 && !pmu_sys_suspended)
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pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
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/* reset requested change */
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requested_change = -1;
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spin_unlock_irqrestore(&pmu_blink_lock, flags);
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}
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static void pmu_led_set(struct led_classdev *led_cdev,
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enum led_brightness brightness)
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{
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unsigned long flags;
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spin_lock_irqsave(&pmu_blink_lock, flags);
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switch (brightness) {
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case LED_OFF:
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requested_change = 0;
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break;
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case LED_FULL:
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requested_change = 1;
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break;
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default:
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goto out;
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break;
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}
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/* if request isn't done, then don't do anything */
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if (pmu_blink_req.complete && !pmu_sys_suspended)
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pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
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out:
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spin_unlock_irqrestore(&pmu_blink_lock, flags);
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}
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static struct led_classdev pmu_led = {
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.name = "pmu-led::front",
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#ifdef CONFIG_ADB_PMU_LED_DISK
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.default_trigger = "disk-activity",
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#endif
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.brightness_set = pmu_led_set,
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};
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static int __init via_pmu_led_init(void)
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{
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struct device_node *dt;
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const char *model;
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/* only do this on keylargo based models */
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if (pmu_get_model() != PMU_KEYLARGO_BASED)
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return -ENODEV;
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dt = of_find_node_by_path("/");
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if (dt == NULL)
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return -ENODEV;
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model = of_get_property(dt, "model", NULL);
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if (model == NULL) {
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of_node_put(dt);
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return -ENODEV;
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}
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if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
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strncmp(model, "iBook", strlen("iBook")) != 0 &&
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strcmp(model, "PowerMac7,2") != 0 &&
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strcmp(model, "PowerMac7,3") != 0) {
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of_node_put(dt);
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/* ignore */
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return -ENODEV;
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}
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of_node_put(dt);
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spin_lock_init(&pmu_blink_lock);
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/* no outstanding req */
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pmu_blink_req.complete = 1;
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pmu_blink_req.done = pmu_req_done;
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return led_classdev_register(NULL, &pmu_led);
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}
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late_initcall(via_pmu_led_init);
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