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| 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); |
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