drivers/leds/leds-cobalt-qube.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2006 - Florian Fainelli <florian@openwrt.org>
   4  *
   5  * Control the Cobalt Qube/RaQ front LED
   6  */
   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
  41         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  42         if (!res)
  43                 return -EBUSY;
  44
  45         led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
  46         if (!led_port)
  47                 return -ENOMEM;
  48
  49         led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
  50         writeb(led_value, led_port);
  51
  52         return devm_led_classdev_register(&pdev->dev, &qube_front_led);
  53 }
  54
  55 static struct platform_driver cobalt_qube_led_driver = {
  56         .probe  = cobalt_qube_led_probe,
  57         .driver = {
  58                 .name   = "cobalt-qube-leds",
  59         },
  60 };
  61
  62 module_platform_driver(cobalt_qube_led_driver);
  63
  64 MODULE_LICENSE("GPL");
  65 MODULE_DESCRIPTION("Front LED support for Cobalt Server");
  66 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
  67 MODULE_ALIAS("platform:cobalt-qube-leds");