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Linux/drivers/leds/leds-cobalt-qube.c

  1 /*
  2  * Copyright 2006 - Florian Fainelli <florian@openwrt.org>
  3  *
  4  * Control the Cobalt Qube/RaQ front LED
  5  */
  6 #include <linux/init.h>
  7 #include <linux/io.h>
  8 #include <linux/ioport.h>
  9 #include <linux/leds.h>
 10 #include <linux/module.h>
 11 #include <linux/platform_device.h>
 12 #include <linux/types.h>
 13 
 14 #define LED_FRONT_LEFT  0x01
 15 #define LED_FRONT_RIGHT 0x02
 16 
 17 static void __iomem *led_port;
 18 static u8 led_value;
 19 
 20 static void qube_front_led_set(struct led_classdev *led_cdev,
 21                                enum led_brightness brightness)
 22 {
 23         if (brightness)
 24                 led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
 25         else
 26                 led_value = ~(LED_FRONT_LEFT | LED_FRONT_RIGHT);
 27         writeb(led_value, led_port);
 28 }
 29 
 30 static struct led_classdev qube_front_led = {
 31         .name                   = "qube::front",
 32         .brightness             = LED_FULL,
 33         .brightness_set         = qube_front_led_set,
 34         .default_trigger        = "default-on",
 35 };
 36 
 37 static int cobalt_qube_led_probe(struct platform_device *pdev)
 38 {
 39         struct resource *res;
 40         int retval;
 41 
 42         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 43         if (!res)
 44                 return -EBUSY;
 45 
 46         led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 47         if (!led_port)
 48                 return -ENOMEM;
 49 
 50         led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
 51         writeb(led_value, led_port);
 52 
 53         retval = led_classdev_register(&pdev->dev, &qube_front_led);
 54         if (retval)
 55                 goto err_null;
 56 
 57         return 0;
 58 
 59 err_null:
 60         led_port = NULL;
 61 
 62         return retval;
 63 }
 64 
 65 static int cobalt_qube_led_remove(struct platform_device *pdev)
 66 {
 67         led_classdev_unregister(&qube_front_led);
 68 
 69         if (led_port)
 70                 led_port = NULL;
 71 
 72         return 0;
 73 }
 74 
 75 static struct platform_driver cobalt_qube_led_driver = {
 76         .probe  = cobalt_qube_led_probe,
 77         .remove = cobalt_qube_led_remove,
 78         .driver = {
 79                 .name   = "cobalt-qube-leds",
 80                 .owner  = THIS_MODULE,
 81         },
 82 };
 83 
 84 module_platform_driver(cobalt_qube_led_driver);
 85 
 86 MODULE_LICENSE("GPL");
 87 MODULE_DESCRIPTION("Front LED support for Cobalt Server");
 88 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
 89 MODULE_ALIAS("platform:cobalt-qube-leds");
 90 

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