1/* 2 * LEDs driver for the Cobalt Raq series. 3 * 4 * Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20#include <linux/init.h> 21#include <linux/io.h> 22#include <linux/ioport.h> 23#include <linux/leds.h> 24#include <linux/platform_device.h> 25#include <linux/spinlock.h> 26#include <linux/types.h> 27 28#define LED_WEB 0x04 29#define LED_POWER_OFF 0x08 30 31static void __iomem *led_port; 32static u8 led_value; 33static DEFINE_SPINLOCK(led_value_lock); 34 35static void raq_web_led_set(struct led_classdev *led_cdev, 36 enum led_brightness brightness) 37{ 38 unsigned long flags; 39 40 spin_lock_irqsave(&led_value_lock, flags); 41 42 if (brightness) 43 led_value |= LED_WEB; 44 else 45 led_value &= ~LED_WEB; 46 writeb(led_value, led_port); 47 48 spin_unlock_irqrestore(&led_value_lock, flags); 49} 50 51static struct led_classdev raq_web_led = { 52 .name = "raq::web", 53 .brightness_set = raq_web_led_set, 54}; 55 56static void raq_power_off_led_set(struct led_classdev *led_cdev, 57 enum led_brightness brightness) 58{ 59 unsigned long flags; 60 61 spin_lock_irqsave(&led_value_lock, flags); 62 63 if (brightness) 64 led_value |= LED_POWER_OFF; 65 else 66 led_value &= ~LED_POWER_OFF; 67 writeb(led_value, led_port); 68 69 spin_unlock_irqrestore(&led_value_lock, flags); 70} 71 72static struct led_classdev raq_power_off_led = { 73 .name = "raq::power-off", 74 .brightness_set = raq_power_off_led_set, 75 .default_trigger = "power-off", 76}; 77 78static int __devinit cobalt_raq_led_probe(struct platform_device *pdev) 79{ 80 struct resource *res; 81 int retval; 82 83 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 84 if (!res) 85 return -EBUSY; 86 87 led_port = ioremap(res->start, resource_size(res)); 88 if (!led_port) 89 return -ENOMEM; 90 91 retval = led_classdev_register(&pdev->dev, &raq_power_off_led); 92 if (retval) 93 goto err_iounmap; 94 95 retval = led_classdev_register(&pdev->dev, &raq_web_led); 96 if (retval) 97 goto err_unregister; 98 99 return 0; 100 101err_unregister: 102 led_classdev_unregister(&raq_power_off_led); 103 104err_iounmap: 105 iounmap(led_port); 106 led_port = NULL; 107 108 return retval; 109} 110 111static int __devexit cobalt_raq_led_remove(struct platform_device *pdev) 112{ 113 led_classdev_unregister(&raq_power_off_led); 114 led_classdev_unregister(&raq_web_led); 115 116 if (led_port) { 117 iounmap(led_port); 118 led_port = NULL; 119 } 120 121 return 0; 122} 123 124static struct platform_driver cobalt_raq_led_driver = { 125 .probe = cobalt_raq_led_probe, 126 .remove = __devexit_p(cobalt_raq_led_remove), 127 .driver = { 128 .name = "cobalt-raq-leds", 129 .owner = THIS_MODULE, 130 }, 131}; 132 133static int __init cobalt_raq_led_init(void) 134{ 135 return platform_driver_register(&cobalt_raq_led_driver); 136} 137 138module_init(cobalt_raq_led_init); 139