------------------------------------------------------------------------------
static const struct file_operations spi_fops={
.owner=THIS_MODULE,
.open=spi_open,
.release=spi_release,
.read=spi_read,
.write=spi_write,
};
static void spi_interrupt(int irq,void *dev_id,struct pt_regs *reg)
{
unsigned int port_status;
unsigned int i=0;
volatile int endSpiRx=0;
port_status=readl(SCRPND);
port_status|=(1<<22);
writel(port_status,SCRPND);
port_status=readl(INTPND);
port_status|=(1<<22);
writel(port_status,INTPND);
//SCRPND|=(1<<22);
//INTPND|=(1<<22);
disable_irq(IRQ_SPI0);
// SPCON0|=(0<<6)|(0<<5)|(0<<4)|(0<<3)|(1<<2)|(0<<1)|(1<<0);
while(endSpiRx==0)
{
while (!SPI_TXRX_READY);
writeb(0xff,SPTDAT0);
while(!SPI_TXRX_READY);
spi_devp->dataRx[i]=SPRDAT0;
i++;
if(i>4)
{
endSpiRx=1;
}
}
port_status=readl(SPCON0);
port_status|=((0<<6)|(1<<5)|(0<<4)|(1<<3)|(1<<2)|(0<<1)|(0<<0));
writel(port_status,SPCON0);
enable_irq(IRQ_SPI0);
printk("SPI irq end\n");
}
static void spi_setup_cdev(struct spi_dev *dev,int index)
{
int err,devno=MKDEV(SPI_MAJOR,index);
cdev_init(&dev->cdev,&spi_fops);
//cdev_init(&spi_dev,&spi_fops);
dev->cdev.owner=THIS_MODULE;
dev->cdev.ops=&spi_fops;
err=cdev_add(&dev->cdev,devno,1);
if(err)
printk("error\n");
printk("-----------------------------------\n");
}
static int __init spi_init(void)
{
int ret;
dev_t devno=MKDEV(SPI_MAJOR,0);
if(SPI_MAJOR)//申请设备号
ret=register_chrdev_region(devno,1,SPI_NAME);
else//动态申请设备号
{
ret=alloc_chrdev_region(&devno,0,1,SPI_NAME);
SPI_MAJOR=MAJOR(devno);
}
if(ret<0)
return ret;
//动态申请设备结构体的内存
spi_devp=kmalloc(sizeof(struct spi_dev),GFP_KERNEL);
if(!spi_devp)//申请失败
{
ret=-ENOMEM;
goto fail_malloc;
}
memset(spi_devp,0,sizeof(struct spi_dev));
spi_setup_cdev(spi_devp,0);
printk("init spi success\n");
return 0;
fail_malloc:
unregister_chrdev_region(devno,1);
return ret;
}
static void __exit spi_exit(void)
{
free_irq(IRQ_SPI0,NULL);
unregister_chrdev(SPI_MAJOR,SPI_NAME);
}
//-----------------------------------------------------------------------------------------------------------------------
module_init(spi_init);
module_exit(spi_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gflytu");
MODULE_DESCRIPTION("SPI DRIVER FOR MINI_S3C2440");