// devices.c
// Author: Josh Holtrop
// Date: 08/02/04
// Modified: 08/16/04


#include "fs/devices.h"
#include "kernel.h"
#include "char/parallel.h"
#include "char/vconsole.h"

dev_driver_t *drivers[2][256];


// initialization routine for devices subsystem
void	devices_init()
{
	parallel_init(MAJORC_PARALLEL);
	vconsole_init(MAJORC_VCONSOLE);
}


int	devices_register_major(char type, major_t major, dev_driver_t *dev)
{
	int idx;
	if (type == 'b')
		idx = 0;
	else if (type == 'c')
		idx = 1;
	else
		return -1;
	if (drivers[idx][major])
		return -2;	//driver already registered
	drivers[idx][major] = dev;
	return 0;
}


int     block_read(major_t major, minor_t minor, u32_t blockStart, u32_t blocks, void *buffer)
{
	if (drivers[0][major] && drivers[0][major]->block_read)
		return drivers[0][major]->block_read(minor, blockStart, blocks, buffer);
	return INT_MIN;
}


int     block_write(major_t major, minor_t minor, u32_t blockStart, u32_t blocks, void *buffer)
{
	if (drivers[0][major] && drivers[0][major]->block_write)
		return drivers[0][major]->block_write(minor, blockStart, blocks, buffer);
	return INT_MIN;
}


int     char_read(major_t major, minor_t minor)
{
	if (drivers[1][major] && drivers[1][major]->char_read)
		return drivers[1][major]->char_read(minor);
	return INT_MIN;
}


int     char_write(major_t major, minor_t minor, int c)
{
	if (drivers[1][major] && drivers[1][major]->char_write)
		return drivers[1][major]->char_write(minor, c);
	return INT_MIN;
}