/* * 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 int sleeping; 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 && !sleeping) 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 && !sleeping) 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_BLK_DEV_IDE_PMAC_BLINK .default_trigger = "ide-disk", #endif .brightness_set = pmu_led_set, }; #ifdef CONFIG_PM static int pmu_led_sleep_call(struct pmu_sleep_notifier *self, int when) { unsigned long flags; spin_lock_irqsave(&pmu_blink_lock, flags); switch (when) { case PBOOK_SLEEP_REQUEST: sleeping = 1; break; case PBOOK_WAKE: sleeping = 0; break; default: /* do nothing */ break; } spin_unlock_irqrestore(&pmu_blink_lock, flags); return PBOOK_SLEEP_OK; } static struct pmu_sleep_notifier via_pmu_led_sleep_notif = { .notifier_call = pmu_led_sleep_call, }; #endif 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 = (const char *)get_property(dt, "model", NULL); if (model == NULL) return -ENODEV; if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 && strncmp(model, "iBook", strlen("iBook")) != 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; #ifdef CONFIG_PM pmu_register_sleep_notifier(&via_pmu_led_sleep_notif); #endif return led_classdev_register(NULL, &pmu_led); } late_initcall(via_pmu_led_init);