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| #include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/ide.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/of_address.h>
#include <asm/mach/map.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/errno.h>
#define on 1
#define off 0
static void __iomem *CCM_CCGR1;
static void __iomem *SW_MUX_GPIO1_IO03;
static void __iomem *SW_PAD_GPIO1_IO03;
static void __iomem *GPIO1_DR;
static void __iomem *GPIO1_GDIR;
int led_switch(u8 state)
{
u32 val;
val = readl(GPIO1_DR);
if(state == on)
{
val |= (0<<3);
}else if(state == off)
{
val |= (1<<3);
}
writel(val, GPIO1_DR);
return 0;
}
struct devtree {
dev_t devid;
struct cdev cdev;
struct class *class;
struct device *device;
int major;
int minor;
struct device_node *nd;
};
struct devtree chrled;
static int led_open(struct inode *inode , struct file *filp)
{
filp->private_data = &chrled;
return 0;
}
static int led_release(struct inode *inode, struct file *filp)
{
return 0;
}
static ssize_t led_read(struct file *filp, char __user *buf, size_t cnt, loff_t *offt)
{
return 0;
}
static ssize_t led_write(struct file *filp, const char __user *buf, size_t cnt, loff_t *offt)
{
int val;
unsigned char databuf[1];
unsigned char state;
val = copy_from_user(databuf, buf, cnt);
state = databuf[0];
if(state == on)
{
led_switch(on);
}else if(state == off)
{
led_switch(off);
}
return 0;
}
static struct file_operations chrops = {
.owner = THIS_MODULE,
.open = led_open,
.read = led_read,
.write = led_write,
.release = led_release,
};
static int __init chrled_init(void)
{
int val;
struct property *proper;
int ret;
const char *str;
u32 regdata[14];
chrled.nd = of_find_node_by_path("/alphaled");
if(chrled.nd == NULL)
{
printk("error: node don't find \r\n");
return -EINVAL;
}
proper = of_find_property(chrled.nd, "compatible", NULL);
if(proper == NULL)
{
printk("compatible property find failed\r\n");
}
ret = of_property_read_string(chrled.nd, "status", &str);
if(ret < 0)
{
printk("status read failed\r\n");
}else{
printk("status = %s\r\n",str);
}
ret = of_property_read_u32_array(chrled.nd , "reg", regdata, 10);
if(ret < 0)
{
printk("reg property read failed!\r\n");
}else{
u8 i = 0;
printk("reg data: \r\n");
for(i = 0;i < 10; i++)
printk("%#X ", regdata[i]);
printk("\r\n");
}
CCM_CCGR1 = of_iomap(chrled.nd, 0);
SW_MUX_GPIO1_IO03 = of_iomap(chrled.nd, 1);
SW_PAD_GPIO1_IO03 = of_iomap(chrled.nd, 2);
GPIO1_DR = of_iomap(chrled.nd, 3);
GPIO1_GDIR = of_iomap(chrled.nd, 4);
val = readl(CCM_CCGR1);
val &= ~(3 << 26);
val |= (3<<26);
writel(val, CCM_CCGR1);
writel(5, SW_MUX_GPIO1_IO03);
writel(0x10B0, SW_PAD_GPIO1_IO03);
val = readl(GPIO1_GDIR);
val &= ~(1<<3);
val |= (1<<3);
writel(val, GPIO1_GDIR);
val = readl(GPIO1_DR);
val |= (1<<3);
writel(val, GPIO1_DR);
if(chrled.major)
{
chrled.devid = MKDEV(chrled.major, 0);
register_chrdev_region(chrled.devid, 1, "led");
}else{
alloc_chrdev_region(&chrled.devid, 0, 1,"led");
chrled.major = MAJOR(chrled.devid);
chrled.minor = MINOR(chrled.devid);
}
cdev_init(&chrled.cdev, &chrops);
chrled.cdev.owner = THIS_MODULE;
cdev_add(&chrled.cdev, chrled.devid, 1);
chrled.class = class_create(THIS_MODULE, "led");
if(IS_ERR(chrled.class))
{
return PTR_ERR(chrled.class);
}
chrled.device = device_create(chrled.class, NULL,chrled.devid, NULL,"led");
if(IS_ERR(chrled.device))
{
return PTR_ERR(chrled.device);
}
return 0;
}
static void __exit chrled_exit(void)
{
iounmap(CCM_CCGR1);
iounmap(SW_MUX_GPIO1_IO03);
iounmap(SW_PAD_GPIO1_IO03);
iounmap(GPIO1_GDIR);
iounmap(GPIO1_DR);
cdev_del(&chrled.cdev);
unregister_chrdev_region(chrled.devid, 1);
device_destroy(chrled.class, chrled.devid);
class_destroy(chrled.class);
}
module_init(chrled_init);
module_exit(chrled_exit);
MODULE_LICENSE("GPL");
|
