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#include <linux/poll.h>
#include <linux/miscdevice.h>
#include "spi_dev.h"
#include "boardEnv/mvBoardEnvLib.h"
#include "voiceband/mvSysTdmSpi.h"

/* Defines */
#define SPI_MOD_NAME				"spi"

static ssize_t spi_read(struct file *file, char __user *buf, size_t size, loff_t * ppos);
static ssize_t spi_write(struct file *file, const char __user *buf, size_t size, loff_t * ppos);
static unsigned int spi_poll(struct file *pFile, poll_table *pPollTable);
static int spi_ioctl(struct inode *pInode, struct file *pFile, unsigned int cmd, unsigned long arg);
static int spi_open(struct inode *pInode, struct file *pFile);
static int spi_release(struct inode *pInode, struct file *pFile);

/* SPI-API Dispatchers */
static int spi_read_reg(unsigned long arg);
static int spi_write_reg(unsigned long arg);

/* Structs */
static struct file_operations spi_fops = {
    owner:      THIS_MODULE,
    llseek:     NULL,
    read:       spi_read,
    write:      spi_write,
    poll:       spi_poll,
    ioctl:      spi_ioctl,
    open:       spi_open,
    release:    spi_release,
    fasync:     NULL
};

/* Globals */
static struct miscdevice spi_misc_dev = {
//	.minor = SLICDEV_MINOR,
	.minor = MISC_DYNAMIC_MINOR,
 	.name = SPI_MOD_NAME,
 	.fops = &spi_fops,
};

static ssize_t spi_read(struct file *file, char __user *buf, size_t size, loff_t * ppos)
{
	return 0;
}

static ssize_t spi_write(struct file *file, const char __user *buf, size_t size, loff_t * ppos)
{
	return 0;
}

static unsigned int spi_poll(struct file *pFile, poll_table *pPollTable)
{
	return 0;
}

static int spi_ioctl(struct inode *pInode, struct file *pFile, unsigned int cmd, unsigned long arg)
{
	int ret = 0;

	/* Argument checking */
	if (_IOC_TYPE(cmd) != SPI_MOD_IOCTL_MAGIC) {
		printk("%s: invalid SPI MOD Magic Num %i %i\n", __func__, _IOC_TYPE(cmd), SPI_MOD_IOCTL_MAGIC);
		return -ENOTTY;
	}

	if ((_IOC_NR(cmd) > SPI_MOD_IOCTL_MAX) || (_IOC_NR(cmd) < SPI_MOD_IOCTL_MIN)) {
		printk("%s: invalid SPI MOD IOCTL request\n", __func__);
		return -ENOTTY;
	}

	if (_IOC_DIR(cmd) & _IOC_READ) {
		ret = !access_ok(VERIFY_WRITE, (void __user*)arg, _IOC_SIZE(cmd));
	} 
	else if (_IOC_DIR(cmd) & _IOC_WRITE) {
		ret = !access_ok(VERIFY_READ, (void __user*)arg, _IOC_SIZE(cmd));
	}

	if (ret) {
		printk("%s: invalid SPI MOD access type %i from cmd %i\n", __func__, _IOC_DIR(cmd), cmd);
		return -EFAULT;
	}

	switch (cmd) {
		
		case SPI_MOD_IOX_REG_READ:
			//printk("ioctl: SPI_MOD_IOX_REG_READ\n");
			ret = spi_read_reg(arg);
			break;
		
		case SPI_MOD_IOX_REG_WRITE:
			//printk("ioctl: SPI_MOD_IOX_REG_WRITE\n");
			ret = spi_write_reg(arg);
			break;

		default:
			printk("%s: error, ioctl command(0x%x) not supported !!!\n", __func__, cmd);
			ret = -EFAULT;
			break;
	}

	return ret;
}

static int spi_read_reg(unsigned long arg)
{
	SpiModRWObjType data;

	/* Get user data */
	if(copy_from_user(&data, (void*)arg, sizeof(SpiModRWObjType))) {
		printk("%s: copy_from_user failed\n", __func__);
		return -EFAULT;
	}

	mvSysTdmIntDisable(data.lineId);

	mvSysTdmSpiRead(data.lineId, data.pCmdBuff, data.cmdSize, data.pDataBuff, data.dataSize);

	mvSysTdmIntEnable(data.lineId);

	/* Copy status back to user */
	if(copy_to_user((void*)arg, &data, sizeof(SpiModRWObjType))) {
		printk("%s: copy_to_user failed\n", __func__);
		return  -EFAULT;
	}

	return 0;
}

static int spi_write_reg(unsigned long arg)
{
	SpiModRWObjType data;

	/* Get user data */
	if(copy_from_user(&data, (void*)arg, sizeof(SpiModRWObjType))) {
		printk("%s: copy_from_user failed\n", __func__);
		return -EFAULT;
	}
	
	mvSysTdmIntDisable(data.lineId);

	mvSysTdmSpiWrite(data.lineId, data.pCmdBuff, data.cmdSize, data.pDataBuff, data.dataSize);

	mvSysTdmIntEnable(data.lineId);

	/* Copy status back to user */
	if(copy_to_user((void*)arg, &data, sizeof(SpiModRWObjType))) {
		printk("%s: copy_to_user failed\n", __func__);
		return  -EFAULT;
	}

	return 0;
}

static int spi_open(struct inode *pInode, struct file *pFile)
{
	try_module_get(THIS_MODULE);
	return 0;
}

static int spi_release(struct inode *pInode, struct file *pFile)
{
	module_put(THIS_MODULE);
	return 0;
}

int __init spi_module_init(void)
{
	int status = 0;

	printk("Loading Marvell %s device\n", SPI_MOD_NAME);
	
	status = misc_register(&spi_misc_dev);

	/* Register SPI device module */
	if (status < 0) {
		printk("Error, failed to load %s module(%d)\n", SPI_MOD_NAME, status);
		return status;
	}
	return 0;
}

void __exit spi_module_exit(void)
{
	printk("Unloading %s device module\n", SPI_MOD_NAME);

	/* Unregister SPI misc device */
	misc_deregister(&spi_misc_dev);

	return;
}

/* Module stuff */
module_init(spi_module_init);
module_exit(spi_module_exit);
MODULE_DESCRIPTION("SPI Access Device");
MODULE_AUTHOR("Nadav Haklai <nadavh@marvell.com>");
MODULE_LICENSE("GPL");