target/linux/ar71xx/files/drivers/leds/leds-rb750.c

   1 /*
   2  * LED driver for the RouterBOARD 750
   3  *
   4  * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/leds.h>
  16 #include <linux/slab.h>
  17
  18 #include <asm/mach-ath79/mach-rb750.h>
  19
  20 #define DRV_NAME        "leds-rb750"
  21
  22 struct rb750_led_dev {
  23         struct led_classdev     cdev;
  24         u32                     mask;
  25         int                     active_low;
  26 };
  27
  28 struct rb750_led_drvdata {
  29         struct rb750_led_dev    *led_devs;
  30         int                     num_leds;
  31 };
  32
  33 static inline struct rb750_led_dev *to_rbled(struct led_classdev *led_cdev)
  34 {
  35         return (struct rb750_led_dev *)container_of(led_cdev,
  36                 struct rb750_led_dev, cdev);
  37 }
  38
  39 static void rb750_led_brightness_set(struct led_classdev *led_cdev,
  40                                      enum led_brightness value)
  41 {
  42         struct rb750_led_dev *rbled = to_rbled(led_cdev);
  43         int level;
  44
  45         level = (value == LED_OFF) ? 0 : 1;
  46         level ^= rbled->active_low;
  47
  48         if (level)
  49                 rb750_latch_change(0, rbled->mask);
  50         else
  51                 rb750_latch_change(rbled->mask, 0);
  52 }
  53
  54 static int __devinit rb750_led_probe(struct platform_device *pdev)
  55 {
  56         struct rb750_led_platform_data *pdata;
  57         struct rb750_led_drvdata *drvdata;
  58         int ret = 0;
  59         int i;
  60
  61         pdata = pdev->dev.platform_data;
  62         if (!pdata)
  63                 return -EINVAL;
  64
  65         drvdata = kzalloc(sizeof(struct rb750_led_drvdata) +
  66                           sizeof(struct rb750_led_dev) * pdata->num_leds,
  67                           GFP_KERNEL);
  68         if (!drvdata)
  69                 return -ENOMEM;
  70
  71         drvdata->num_leds = pdata->num_leds;
  72         drvdata->led_devs = (struct rb750_led_dev *) &drvdata[1];
  73
  74         for (i = 0; i < drvdata->num_leds; i++) {
  75                 struct rb750_led_dev *rbled = &drvdata->led_devs[i];
  76                 struct rb750_led_data *led_data = &pdata->leds[i];
  77
  78                 rbled->cdev.name = led_data->name;
  79                 rbled->cdev.default_trigger = led_data->default_trigger;
  80                 rbled->cdev.brightness_set = rb750_led_brightness_set;
  81                 rbled->cdev.brightness = LED_OFF;
  82
  83                 rbled->mask = led_data->mask;
  84                 rbled->active_low = !!led_data->active_low;
  85
  86                 ret = led_classdev_register(&pdev->dev, &rbled->cdev);
  87                 if (ret)
  88                         goto err;
  89         }
  90
  91         platform_set_drvdata(pdev, drvdata);
  92         return 0;
  93
  94 err:
  95         for (i = i - 1; i >= 0; i--)
  96                 led_classdev_unregister(&drvdata->led_devs[i].cdev);
  97
  98         kfree(drvdata);
  99         return ret;
 100 }
 101
 102 static int __devexit rb750_led_remove(struct platform_device *pdev)
 103 {
 104         struct rb750_led_drvdata *drvdata;
 105         int i;
 106
 107         drvdata = platform_get_drvdata(pdev);
 108         for (i = 0; i < drvdata->num_leds; i++)
 109                 led_classdev_unregister(&drvdata->led_devs[i].cdev);
 110
 111         kfree(drvdata);
 112         return 0;
 113 }
 114
 115 static struct platform_driver rb750_led_driver = {
 116         .probe          = rb750_led_probe,
 117         .remove         = __devexit_p(rb750_led_remove),
 118         .driver         = {
 119                 .name   = DRV_NAME,
 120                 .owner  = THIS_MODULE,
 121         },
 122 };
 123
 124 MODULE_ALIAS("platform:leds-rb750");
 125
 126 static int __init rb750_led_init(void)
 127 {
 128         return platform_driver_register(&rb750_led_driver);
 129 }
 130
 131 static void __exit rb750_led_exit(void)
 132 {
 133         platform_driver_unregister(&rb750_led_driver);
 134 }
 135
 136 module_init(rb750_led_init);
 137 module_exit(rb750_led_exit);
 138
 139 MODULE_DESCRIPTION(DRV_NAME);
 140 MODULE_DESCRIPTION("LED driver for the RouterBOARD 750");
 141 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
 142 MODULE_LICENSE("GPL v2");