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/*
* EASY98000 CPLD LED driver
*
* Copyright (C) 2010 Ralph Hempel <ralph.hempel@lantiq.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
*/
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include "dev-leds-easy98000-cpld.h"
const char *led_name[8] = {
"ge0_act",
"ge0_link",
"ge1_act",
"ge1_link",
"fe2_act",
"fe2_link",
"fe3_act",
"fe3_link"
};
#define cpld_base7 ((u16 *)(KSEG1 | 0x17c0000c))
#define cpld_base8 ((u16 *)(KSEG1 | 0x17c00012))
#define ltq_r16(reg) __raw_readw(reg)
#define ltq_w16(val, reg) __raw_writew(val, reg)
struct cpld_led_dev {
struct led_classdev cdev;
u8 mask;
u16 *base;
};
struct cpld_led_drvdata {
struct cpld_led_dev *led_devs;
int num_leds;
};
void led_set(u8 mask, u16 *base)
{
ltq_w16(ltq_r16(base) | mask, base);
}
void led_clear(u8 mask, u16 *base)
{
ltq_w16(ltq_r16(base) & (~mask), base);
}
void led_blink_clear(u8 mask, u16 *base)
{
led_clear(mask, base);
}
static void led_brightness(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct cpld_led_dev *led_dev =
container_of(led_cdev, struct cpld_led_dev, cdev);
if (value)
led_set(led_dev->mask, led_dev->base);
else
led_clear(led_dev->mask, led_dev->base);
}
static int led_probe(struct platform_device *pdev)
{
int i;
char name[32];
struct cpld_led_drvdata *drvdata;
int ret = 0;
drvdata = kzalloc(sizeof(struct cpld_led_drvdata) +
sizeof(struct cpld_led_dev) * MAX_LED,
GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
drvdata->led_devs = (struct cpld_led_dev *) &drvdata[1];
for (i = 0; i < MAX_LED; i++) {
struct cpld_led_dev *led_dev = &drvdata->led_devs[i];
led_dev->cdev.brightness_set = led_brightness;
led_dev->cdev.default_trigger = NULL;
led_dev->mask = 1 << (i % 8);
if(i < 8) {
sprintf(name, "easy98000-cpld:%s", led_name[i]);
led_dev->base = cpld_base8;
} else {
sprintf(name, "easy98000-cpld:red:%d", i-8);
led_dev->base = cpld_base7;
}
led_dev->cdev.name = name;
ret = led_classdev_register(&pdev->dev, &led_dev->cdev);
if (ret)
goto err;
}
platform_set_drvdata(pdev, drvdata);
return 0;
err:
printk("led_probe: 3\n");
for (i = i - 1; i >= 0; i--)
led_classdev_unregister(&drvdata->led_devs[i].cdev);
kfree(drvdata);
return ret;
}
static int led_remove(struct platform_device *pdev)
{
int i;
struct cpld_led_drvdata *drvdata = platform_get_drvdata(pdev);
for (i = 0; i < MAX_LED; i++)
led_classdev_unregister(&drvdata->led_devs[i].cdev);
kfree(drvdata);
return 0;
}
static struct platform_driver led_driver = {
.probe = led_probe,
.remove = __devexit_p(led_remove),
.driver = {
.name = LED_NAME,
.owner = THIS_MODULE,
},
};
int __init easy98000_cpld_led_init(void)
{
pr_info(LED_DESC ", Version " LED_VERSION
" (c) Copyright 2011, Lantiq Deutschland GmbH\n");
return platform_driver_register(&led_driver);
}
void __exit easy98000_cpld_led_exit(void)
{
platform_driver_unregister(&led_driver);
}
module_init(easy98000_cpld_led_init);
module_exit(easy98000_cpld_led_exit);
MODULE_DESCRIPTION(LED_NAME);
MODULE_DESCRIPTION(LED_DESC);
MODULE_AUTHOR("Ralph Hempel <ralph.hempel@lantiq.com>");
MODULE_LICENSE("GPL v2");
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