/* * LEDs driver for the Cobalt Raq series. * * Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org> * * 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. 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 Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <linux/init.h> #include <linux/io.h> #include <linux/ioport.h> #include <linux/leds.h> #include <linux/platform_device.h> #include <linux/spinlock.h> #include <linux/types.h> #include <linux/export.h> #define LED_WEB 0x04 #define LED_POWER_OFF 0x08 static void __iomem *led_port; static u8 led_value; static DEFINE_SPINLOCK(led_value_lock); static void raq_web_led_set(struct led_classdev *led_cdev, enum led_brightness brightness) { unsigned long flags; spin_lock_irqsave(&led_value_lock, flags); if (brightness) led_value |= LED_WEB; else led_value &= ~LED_WEB; writeb(led_value, led_port); spin_unlock_irqrestore(&led_value_lock, flags); } static struct led_classdev raq_web_led = { .name = "raq::web", .brightness_set = raq_web_led_set, }; static void raq_power_off_led_set(struct led_classdev *led_cdev, enum led_brightness brightness) { unsigned long flags; spin_lock_irqsave(&led_value_lock, flags); if (brightness) led_value |= LED_POWER_OFF; else led_value &= ~LED_POWER_OFF; writeb(led_value, led_port); spin_unlock_irqrestore(&led_value_lock, flags); } static struct led_classdev raq_power_off_led = { .name = "raq::power-off", .brightness_set = raq_power_off_led_set, .default_trigger = "power-off", }; static int cobalt_raq_led_probe(struct platform_device *pdev) { struct resource *res; int retval; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -EBUSY; led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res)); if (!led_port) return -ENOMEM; retval = led_classdev_register(&pdev->dev, &raq_power_off_led); if (retval) goto err_null; retval = led_classdev_register(&pdev->dev, &raq_web_led); if (retval) goto err_unregister; return 0; err_unregister: led_classdev_unregister(&raq_power_off_led); err_null: led_port = NULL; return retval; } static struct platform_driver cobalt_raq_led_driver = { .probe = cobalt_raq_led_probe, .driver = { .name = "cobalt-raq-leds", }, }; builtin_platform_driver(cobalt_raq_led_driver);