target/linux/lantiq/files-3.0/arch/mips/lantiq/falcon/dev-leds-easy98000-cpld.c

   1 /*
   2  *  EASY98000 CPLD LED driver
   3  *
   4  *  Copyright (C) 2010 Ralph Hempel <ralph.hempel@lantiq.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2  as published
   8  *  by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/version.h>
  14 #include <linux/types.h>
  15 #include <linux/init.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/errno.h>
  18 #include <linux/leds.h>
  19 #include <linux/slab.h>
  20
  21 #include "dev-leds-easy98000-cpld.h"
  22
  23 const char *led_name[8] = {
  24         "ge0_act",
  25         "ge0_link",
  26         "ge1_act",
  27         "ge1_link",
  28         "fe2_act",
  29         "fe2_link",
  30         "fe3_act",
  31         "fe3_link"
  32 };
  33
  34 #define cpld_base7                      ((u16 *)(KSEG1 | 0x17c0000c))
  35 #define cpld_base8                      ((u16 *)(KSEG1 | 0x17c00012))
  36
  37 #define ltq_r16(reg)                    __raw_readw(reg)
  38 #define ltq_w16(val, reg)               __raw_writew(val, reg)
  39
  40 struct cpld_led_dev {
  41         struct led_classdev     cdev;
  42         u8                      mask;
  43         u16                     *base;
  44 };
  45
  46 struct cpld_led_drvdata {
  47         struct cpld_led_dev     *led_devs;
  48         int                     num_leds;
  49 };
  50
  51 void led_set(u8 mask, u16 *base)
  52 {
  53         ltq_w16(ltq_r16(base) | mask, base);
  54 }
  55
  56 void led_clear(u8 mask, u16 *base)
  57 {
  58         ltq_w16(ltq_r16(base) & (~mask), base);
  59 }
  60
  61 void led_blink_clear(u8 mask, u16 *base)
  62 {
  63         led_clear(mask, base);
  64 }
  65
  66 static void led_brightness(struct led_classdev *led_cdev,
  67                                enum led_brightness value)
  68 {
  69         struct cpld_led_dev *led_dev =
  70             container_of(led_cdev, struct cpld_led_dev, cdev);
  71
  72         if (value)
  73                 led_set(led_dev->mask, led_dev->base);
  74         else
  75                 led_clear(led_dev->mask, led_dev->base);
  76 }
  77
  78 static int led_probe(struct platform_device *pdev)
  79 {
  80         int i;
  81         char name[32];
  82         struct cpld_led_drvdata *drvdata;
  83         int ret = 0;
  84
  85         drvdata = kzalloc(sizeof(struct cpld_led_drvdata) +
  86                           sizeof(struct cpld_led_dev) * MAX_LED,
  87                           GFP_KERNEL);
  88         if (!drvdata)
  89                 return -ENOMEM;
  90
  91         drvdata->led_devs = (struct cpld_led_dev *) &drvdata[1];
  92
  93         for (i = 0; i < MAX_LED; i++) {
  94                 struct cpld_led_dev *led_dev = &drvdata->led_devs[i];
  95                 led_dev->cdev.brightness_set = led_brightness;
  96                 led_dev->cdev.default_trigger = NULL;
  97                 led_dev->mask = 1 << (i % 8);
  98                 if(i < 8) {
  99                         sprintf(name, "easy98000-cpld:%s", led_name[i]);
 100                         led_dev->base = cpld_base8;
 101                 } else {
 102                         sprintf(name, "easy98000-cpld:red:%d", i-8);
 103                         led_dev->base = cpld_base7;
 104                 }
 105                 led_dev->cdev.name = name;
 106                 ret = led_classdev_register(&pdev->dev, &led_dev->cdev);
 107                 if (ret)
 108                         goto err;
 109         }
 110         platform_set_drvdata(pdev, drvdata);
 111         return 0;
 112
 113 err:
 114         printk("led_probe: 3\n");
 115         for (i = i - 1; i >= 0; i--)
 116                 led_classdev_unregister(&drvdata->led_devs[i].cdev);
 117
 118         kfree(drvdata);
 119         return ret;
 120 }
 121
 122 static int led_remove(struct platform_device *pdev)
 123 {
 124         int i;
 125         struct cpld_led_drvdata *drvdata = platform_get_drvdata(pdev);
 126         for (i = 0; i < MAX_LED; i++)
 127                 led_classdev_unregister(&drvdata->led_devs[i].cdev);
 128         kfree(drvdata);
 129         return 0;
 130 }
 131
 132 static struct platform_driver led_driver = {
 133         .probe = led_probe,
 134         .remove = __devexit_p(led_remove),
 135         .driver = {
 136                    .name = LED_NAME,
 137                    .owner = THIS_MODULE,
 138                    },
 139 };
 140
 141 int __init easy98000_cpld_led_init(void)
 142 {
 143         pr_info(LED_DESC ", Version " LED_VERSION
 144                 " (c) Copyright 2011, Lantiq Deutschland GmbH\n");
 145         return platform_driver_register(&led_driver);
 146 }
 147
 148 void __exit easy98000_cpld_led_exit(void)
 149 {
 150         platform_driver_unregister(&led_driver);
 151 }
 152
 153 module_init(easy98000_cpld_led_init);
 154 module_exit(easy98000_cpld_led_exit);
 155
 156 MODULE_DESCRIPTION(LED_NAME);
 157 MODULE_DESCRIPTION(LED_DESC);
 158 MODULE_AUTHOR("Ralph Hempel <ralph.hempel@lantiq.com>");
 159 MODULE_LICENSE("GPL v2");
 160