137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
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* LEDs driver for the Cobalt Raq series.
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*
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* Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org>
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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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/leds.h>
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#include <linux/platform_device.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/export.h>
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#define LED_WEB 0x04
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#define LED_POWER_OFF 0x08
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static void __iomem *led_port;
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static u8 led_value;
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static DEFINE_SPINLOCK(led_value_lock);
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static void raq_web_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(&led_value_lock, flags);
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if (brightness)
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led_value |= LED_WEB;
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else
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led_value &= ~LED_WEB;
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writeb(led_value, led_port);
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spin_unlock_irqrestore(&led_value_lock, flags);
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}
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static struct led_classdev raq_web_led = {
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.name = "raq::web",
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.brightness_set = raq_web_led_set,
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};
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static void raq_power_off_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(&led_value_lock, flags);
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if (brightness)
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led_value |= LED_POWER_OFF;
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else
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led_value &= ~LED_POWER_OFF;
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writeb(led_value, led_port);
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spin_unlock_irqrestore(&led_value_lock, flags);
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}
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static struct led_classdev raq_power_off_led = {
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.name = "raq::power-off",
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.brightness_set = raq_power_off_led_set,
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.default_trigger = "power-off",
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};
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static int cobalt_raq_led_probe(struct platform_device *pdev)
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{
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struct resource *res;
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int retval;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -EBUSY;
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led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
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if (!led_port)
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return -ENOMEM;
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retval = led_classdev_register(&pdev->dev, &raq_power_off_led);
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if (retval)
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goto err_null;
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retval = led_classdev_register(&pdev->dev, &raq_web_led);
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if (retval)
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goto err_unregister;
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return 0;
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err_unregister:
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led_classdev_unregister(&raq_power_off_led);
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err_null:
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led_port = NULL;
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return retval;
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}
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static int cobalt_raq_led_remove(struct platform_device *pdev)
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{
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led_classdev_unregister(&raq_power_off_led);
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led_classdev_unregister(&raq_web_led);
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if (led_port)
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led_port = NULL;
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return 0;
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}
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static struct platform_driver cobalt_raq_led_driver = {
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.probe = cobalt_raq_led_probe,
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.remove = cobalt_raq_led_remove,
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.driver = {
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.name = "cobalt-raq-leds",
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.owner = THIS_MODULE,
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},
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};
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static int __init cobalt_raq_led_init(void)
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{
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return platform_driver_register(&cobalt_raq_led_driver);
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}
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module_init(cobalt_raq_led_init);
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