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         else
  25                 set_latch_u5(0, LO_ULED);
  26 }
  27
  28 static enum led_brightness rb532_led_get(struct led_classdev *cdev)
  29 {
  30         return (get_latch_u5() & LO_ULED) ? LED_FULL : LED_OFF;
  31 }
  32
  33 static struct led_classdev rb532_uled = {
  34         .name = "uled",
  35         .brightness_set = rb532_led_set,
  36         .brightness_get = rb532_led_get,
  37         .default_trigger = "nand-disk",
  38 };
  39
  40 static int rb532_led_probe(struct platform_device *pdev)
  41 {
  42         return led_classdev_register(&pdev->dev, &rb532_uled);
  43 }
  44
  45 static int rb532_led_remove(struct platform_device *pdev)
  46 {
  47         led_classdev_unregister(&rb532_uled);
  48         return 0;
  49 }
  50
  51 static struct platform_driver rb532_led_driver = {
  52         .probe = rb532_led_probe,
  53         .remove = rb532_led_remove,
  54         .driver = {
  55                 .name = "rb532-led",
  56         },
  57 };
  58
  59 module_platform_driver(rb532_led_driver);
  60
  61 MODULE_LICENSE("GPL");
  62 MODULE_DESCRIPTION("User LED support for Routerboard532");
  63 MODULE_AUTHOR("Phil Sutter <n0-1@freewrt.org>");
  64 MODULE_ALIAS("platform:rb532-led");