drivers/leds/leds-locomo.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/drivers/leds/leds-locomo.c
   4  *
   5  * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/device.h>
  12 #include <linux/leds.h>
  13
  14 #include <asm/hardware/locomo.h>
  15
  16 static void locomoled_brightness_set(struct led_classdev *led_cdev,
  17                                 enum led_brightness value, int offset)
  18 {
  19         struct locomo_dev *locomo_dev = LOCOMO_DEV(led_cdev->dev->parent);
  20         unsigned long flags;
  21
  22         local_irq_save(flags);
  23         if (value)
  24                 locomo_writel(LOCOMO_LPT_TOFH, locomo_dev->mapbase + offset);
  25         else
  26                 locomo_writel(LOCOMO_LPT_TOFL, locomo_dev->mapbase + offset);
  27         local_irq_restore(flags);
  28 }
  29
  30 static void locomoled_brightness_set0(struct led_classdev *led_cdev,
  31                                 enum led_brightness value)
  32 {
  33         locomoled_brightness_set(led_cdev, value, LOCOMO_LPT0);
  34 }
  35
  36 static void locomoled_brightness_set1(struct led_classdev *led_cdev,
  37                                 enum led_brightness value)
  38 {
  39         locomoled_brightness_set(led_cdev, value, LOCOMO_LPT1);
  40 }
  41
  42 static struct led_classdev locomo_led0 = {
  43         .name                   = "locomo:amber:charge",
  44         .default_trigger        = "main-battery-charging",
  45         .brightness_set         = locomoled_brightness_set0,
  46 };
  47
  48 static struct led_classdev locomo_led1 = {
  49         .name                   = "locomo:green:mail",
  50         .default_trigger        = "nand-disk",
  51         .brightness_set         = locomoled_brightness_set1,
  52 };
  53
  54 static int locomoled_probe(struct locomo_dev *ldev)
  55 {
  56         int ret;
  57
  58         ret = devm_led_classdev_register(&ldev->dev, &locomo_led0);
  59         if (ret < 0)
  60                 return ret;
  61
  62         return  devm_led_classdev_register(&ldev->dev, &locomo_led1);
  63 }
  64
  65
  66 static struct locomo_driver locomoled_driver = {
  67         .drv = {
  68                 .name = "locomoled"
  69         },
  70         .devid  = LOCOMO_DEVID_LED,
  71         .probe  = locomoled_probe,
  72 };
  73
  74 static int __init locomoled_init(void)
  75 {
  76         return locomo_driver_register(&locomoled_driver);
  77 }
  78 module_init(locomoled_init);
  79
  80 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
  81 MODULE_DESCRIPTION("Locomo LED driver");
  82 MODULE_LICENSE("GPL");