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117 lines
3.1 KiB
117 lines
3.1 KiB
/* |
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* via-pmu LED class device |
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* |
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* Copyright 2006 Johannes Berg <[email protected]> |
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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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