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 #include <linux/export.h> 28 29 #define LED_WEB 0x04 30 #define LED_POWER_OFF 0x08 31 32 static void __iomem *led_port; 33 static u8 led_value; 34 static DEFINE_SPINLOCK(led_value_lock); 35 36 static void raq_web_led_set(struct led_classdev *led_cdev, 37 enum led_brightness brightness) 38 { 39 unsigned long flags; 40 41 spin_lock_irqsave(&led_value_lock, flags); 42 43 if (brightness) 44 led_value |= LED_WEB; 45 else 46 led_value &= ~LED_WEB; 47 writeb(led_value, led_port); 48 49 spin_unlock_irqrestore(&led_value_lock, flags); 50 } 51 52 static struct led_classdev raq_web_led = { 53 .name = "raq::web", 54 .brightness_set = raq_web_led_set, 55 }; 56 57 static void raq_power_off_led_set(struct led_classdev *led_cdev, 58 enum led_brightness brightness) 59 { 60 unsigned long flags; 61 62 spin_lock_irqsave(&led_value_lock, flags); 63 64 if (brightness) 65 led_value |= LED_POWER_OFF; 66 else 67 led_value &= ~LED_POWER_OFF; 68 writeb(led_value, led_port); 69 70 spin_unlock_irqrestore(&led_value_lock, flags); 71 } 72 73 static struct led_classdev raq_power_off_led = { 74 .name = "raq::power-off", 75 .brightness_set = raq_power_off_led_set, 76 .default_trigger = "power-off", 77 }; 78 79 static int cobalt_raq_led_probe(struct platform_device *pdev) 80 { 81 struct resource *res; 82 int retval; 83 84 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 85 if (!res) 86 return -EBUSY; 87 88 led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res)); 89 if (!led_port) 90 return -ENOMEM; 91 92 retval = led_classdev_register(&pdev->dev, &raq_power_off_led); 93 if (retval) 94 goto err_null; 95 96 retval = led_classdev_register(&pdev->dev, &raq_web_led); 97 if (retval) 98 goto err_unregister; 99 100 return 0; 101 102 err_unregister: 103 led_classdev_unregister(&raq_power_off_led); 104 105 err_null: 106 led_port = NULL; 107 108 return retval; 109 } 110 111 static int 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 led_port = NULL; 118 119 return 0; 120 } 121 122 static struct platform_driver cobalt_raq_led_driver = { 123 .probe = cobalt_raq_led_probe, 124 .remove = cobalt_raq_led_remove, 125 .driver = { 126 .name = "cobalt-raq-leds", 127 }, 128 }; 129 130 static int __init cobalt_raq_led_init(void) 131 { 132 return platform_driver_register(&cobalt_raq_led_driver); 133 } 134 135 module_init(cobalt_raq_led_init); 136