drivers/leds/leds-rb532.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * LEDs driver for the "User LED" on Routerboard532
   4  *
   5  * Copyright (C) 2009 Phil Sutter <n0-1@freewrt.org>
   6  *
   7  * Based on leds-cobalt-qube.c by Florian Fainelly and
   8  * rb-diag.c (my own standalone driver for both LED and
   9  * button of Routerboard532).
  10  */
  11
  12 #include <linux/leds.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15
  16 #include <asm/mach-rc32434/gpio.h>
  17 #include <asm/mach-rc32434/rb.h>
  18
  19 static void rb532_led_set(struct led_classdev *cdev,
  20                           enum led_brightness brightness)
  21 {
  22         if (brightness)
  23                 set_latch_u5(LO_ULED, 0);
  24
  25         else
  26                 set_latch_u5(0, LO_ULED);
  27 }
  28
  29 static enum led_brightness rb532_led_get(struct led_classdev *cdev)
  30 {
  31         return (get_latch_u5() & LO_ULED) ? LED_FULL : LED_OFF;
  32 }
  33
  34 static struct led_classdev rb532_uled = {
  35         .name = "uled",
  36         .brightness_set = rb532_led_set,
  37         .brightness_get = rb532_led_get,
  38         .default_trigger = "nand-disk",
  39 };
  40
  41 static int rb532_led_probe(struct platform_device *pdev)
  42 {
  43         return led_classdev_register(&pdev->dev, &rb532_uled);
  44 }
  45
  46 static int rb532_led_remove(struct platform_device *pdev)
  47 {
  48         led_classdev_unregister(&rb532_uled);
  49         return 0;
  50 }
  51
  52 static struct platform_driver rb532_led_driver = {
  53         .probe = rb532_led_probe,
  54         .remove = rb532_led_remove,
  55         .driver = {
  56                 .name = "rb532-led",
  57         },
  58 };
  59
  60 module_platform_driver(rb532_led_driver);
  61
  62 MODULE_LICENSE("GPL");
  63 MODULE_DESCRIPTION("User LED support for Routerboard532");
  64 MODULE_AUTHOR("Phil Sutter <n0-1@freewrt.org>");
  65 MODULE_ALIAS("platform:rb532-led");