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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | /* * 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 int cobalt_raq_led_remove(struct platform_device *pdev) { led_classdev_unregister(&raq_power_off_led); led_classdev_unregister(&raq_web_led); if (led_port) led_port = NULL; return 0; } static struct platform_driver cobalt_raq_led_driver = { .probe = cobalt_raq_led_probe, .remove = cobalt_raq_led_remove, .driver = { .name = "cobalt-raq-leds", }, }; static int __init cobalt_raq_led_init(void) { return platform_driver_register(&cobalt_raq_led_driver); } module_init(cobalt_raq_led_init); |