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/init.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/leds.h>
  15
  16 #include <asm/mach-ar71xx/mach-rb750.h>
  17
  18 #define DRV_NAME        "leds-rb750"
  19
  20 struct rb750_led_dev {
  21         struct led_classdev     cdev;
  22         u32                     mask;
  23         int                     active_low;
  24 };
  25
  26 struct rb750_led_drvdata {
  27         struct rb750_led_dev    *led_devs;
  28         int                     num_leds;
  29 };
  30
  31 static inline struct rb750_led_dev *to_rbled(struct led_classdev *led_cdev)
  32 {
  33         return (struct rb750_led_dev *)container_of(led_cdev,
  34                 struct rb750_led_dev, cdev);
  35 }
  36
  37 static void rb750_led_brightness_set(struct led_classdev *led_cdev,
  38                                      enum led_brightness value)
  39 {
  40         struct rb750_led_dev *rbled = to_rbled(led_cdev);
  41         int level;
  42
  43         level = (value == LED_OFF) ? 0 : 1;
  44         level ^= rbled->active_low;
  45
  46         if (level)
  47                 rb750_latch_change(0, rbled->mask);
  48         else
  49                 rb750_latch_change(rbled->mask, 0);
  50 }
  51
  52 static int __devinit rb750_led_probe(struct platform_device *pdev)
  53 {
  54         struct rb750_led_platform_data *pdata;
  55         struct rb750_led_drvdata *drvdata;
  56         int ret = 0;
  57         int i;
  58
  59         pdata = pdev->dev.platform_data;
  60         if (!pdata)
  61                 return -EINVAL;
  62
  63         drvdata = kzalloc(sizeof(struct rb750_led_drvdata) +
  64                           sizeof(struct rb750_led_dev) * pdata->num_leds,
  65                           GFP_KERNEL);
  66         if (!drvdata)
  67                 return -ENOMEM;
  68
  69         drvdata->num_leds = pdata->num_leds;
  70         drvdata->led_devs = (struct rb750_led_dev *) &drvdata[1];
  71
  72         for (i = 0; i < drvdata->num_leds; i++) {
  73                 struct rb750_led_dev *rbled = &drvdata->led_devs[i];
  74                 struct rb750_led_data *led_data = &pdata->leds[i];
  75
  76                 rbled->cdev.name = led_data->name;
  77                 rbled->cdev.default_trigger = led_data->default_trigger;
  78                 rbled->cdev.brightness_set = rb750_led_brightness_set;
  79                 rbled->cdev.brightness = LED_OFF;
  80
  81                 rbled->mask = led_data->mask;
  82                 rbled->active_low = !!led_data->active_low;
  83
  84                 ret = led_classdev_register(&pdev->dev, &rbled->cdev);
  85                 if (ret)
  86                         goto err;
  87         }
  88
  89         platform_set_drvdata(pdev, drvdata);
  90         return 0;
  91
  92  err:
  93         for (i = i - 1; i >= 0; i--)
  94                 led_classdev_unregister(&drvdata->led_devs[i].cdev);
  95
  96         kfree(drvdata);
  97         return ret;
  98 }
  99
 100 static int __devexit rb750_led_remove(struct platform_device *pdev)
 101 {
 102         struct rb750_led_drvdata *drvdata;
 103         int i;
 104
 105         drvdata = platform_get_drvdata(pdev);
 106         for (i = 0; i < drvdata->num_leds; i++)
 107                 led_classdev_unregister(&drvdata->led_devs[i].cdev);
 108
 109         kfree(drvdata);
 110         return 0;
 111 }
 112
 113 static struct platform_driver rb750_led_driver = {
 114         .probe          = rb750_led_probe,
 115         .remove         = __devexit_p(rb750_led_remove),
 116         .driver         = {
 117                 .name   = DRV_NAME,
 118                 .owner  = THIS_MODULE,
 119         },
 120 };
 121
 122 MODULE_ALIAS("platform:leds-rb750");
 123
 124 static int __init rb750_led_init(void)
 125 {
 126         return platform_driver_register(&rb750_led_driver);
 127 }
 128
 129 static void __exit rb750_led_exit(void)
 130 {
 131         platform_driver_unregister(&rb750_led_driver);
 132 }
 133
 134 module_init(rb750_led_init);
 135 module_exit(rb750_led_exit);
 136
 137 MODULE_DESCRIPTION(DRV_NAME);
 138 MODULE_DESCRIPTION("LED driver for the RouterBOARD 750");
 139 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
 140 MODULE_LICENSE("GPL v2");