adcdev.channel, adc_data, ((ADCCON & 0x80) 1:0));
value = adc_data;
sprintf(str,"%5d", adc_data);
copy_to_user(buffer, (char *)&adc_data, sizeof(adc_data));
ADC_enable = 0;
up(&ADC_LOCK);
len = sprintf(str, "%d\n", value);
if (count >= len)
{
int r = copy_to_user(buffer, str, len);
return r r : len;
}
else
{
return -1;
}
}
else
{
return -1;
//value = -1;
}
}
static int tq2440_adc_open(struct inode *inode, struct file *filp)
{
init_waitqueue_head(&(adcdev.wait));
adcdev.channel=2;
adcdev.prescale=0xff;
DPRINTK( "ADC opened\n");
return 0;
}
static int tq2440_adc_release(struct inode *inode, struct file *filp)
{
DPRINTK( "ADC closed\n");
return 0;
}
static struct file_operations dev_fops = {
.owner = THIS_MODULE,
.open = tq2440_adc_open,
.ioctl = tq2440_adc_ioctl,
.read = tq2440_adc_read,
.release = tq2440_adc_release,
};
static struct miscdevice misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &dev_fops,
};
static int __init dev_init(void)
{
int ret;
base_addr=ioremap(S3C2410_PA_ADC,0x20);
if (base_addr == NULL)
{
printk(KERN_ERR "failed to remap register block\n");
return -ENOMEM;
}
adc_clock = clk_get(NULL, "adc");
if (!adc_clock)
{
printk(KERN_ERR "failed to get adc clock source\n");
return -ENOENT;
}
clk_enable(adc_clock);
ADCTSC = 0;
ret = misc_register(&misc);
printk (DEVICE_NAME" initialized\n");
return ret;
}
static void __exit dev_exit(void)
{
if (adc_clock)
{
clk_disable(adc_clock);
clk_put(adc_clock);
adc_clock = NULL;
}
misc_deregister(&misc);
}
EXPORT_SYMBOL(ADC_LOCK);
module_init(dev_init);
module_exit(dev_exit);
MODULE_LICENSE("GPL");
上述程序的源码以后再作分析。
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