1 /* 2 * LEDs driver for the Cobalt Raq series. 3 * 4 * Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> 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 31 static void __iomem *led_port; 32 static u8 led_value; 33 static DEFINE_SPINLOCK(led_value_lock); 34 35 static 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 51 static struct led_classdev raq_web_led = { 52 .name = "raq-web", 53 .brightness_set = raq_web_led_set, 54 }; 55 56 static 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 72 static 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 78 static 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, res->end - res->start + 1); 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; 100 101 err_unregister: 102 led_classdev_unregister(&raq_power_off_led); 103 104 err_iounmap: 105 iounmap(led_port); 106 led_port = NULL; 107 108 return retval; 109 } 110 111 static 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 } 123 124 static 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 }; 132 133 static int __init cobalt_raq_led_init(void) 134 { 135 return platform_driver_register(&cobalt_raq_led_driver); 136 } 137 138 module_init(cobalt_raq_led_init); 139