/*
 * CHU - IO routines to CH375 from a Linux kernel module
 * Copyright (C) 2026 Javier S. Pedro
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef CH375LNX_H
#define CH375LNX_H

#include <linux/types.h>
#include <linux/ioport.h>
#include <asm/io.h>
#define _Packed __attribute__ ((packed))
typedef enum {
	false = 0,
	true = 1
} bool;

#include <ch375.h>

struct ch375 {
	uint16_t io_base;
	uint16_t sec_size;
};

static inline uint8_t ch375_read_data(struct ch375 *dev)
{
	return inb(dev->io_base + CH375_PORT_DATA);
}

static inline void ch375_write_data(struct ch375 *dev, uint8_t data)
{
	outb(data, dev->io_base + CH375_PORT_DATA);
}

static inline void ch375_send_command(struct ch375 *dev, enum ch375_command cmd)
{
	outb(cmd, dev->io_base + CH375_PORT_CMD);
}

/// True if interrupt line is currently active (i.e. low)
static inline bool ch375_poll_interrupt(struct ch375 *dev)
{
	return !(inb(dev->io_base + CH375_PORT_CMD) & 0x80);
}

/** Reads one transfer block (64 bytes max). */
static uint8_t ch375_read_data_block(struct ch375 *dev, uint8_t *buffer)
{
	uint8_t n = ch375_read_data(dev);

	insb(dev->io_base + CH375_PORT_DATA, buffer, n);

	return n;
}

static void ch375_write_data_block(struct ch375 *dev, uint8_t * buffer, uint8_t n)
{
	ch375_write_data(dev, n);

	outsb(dev->io_base + CH375_PORT_DATA, buffer, n);
}

#endif // CH375LNX_H