/*
 * I2C LCD display AQM0802A test for NetBSD/evbarm on RPI2
 * Copyright (C) Yasushi Oshima.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <err.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <strings.h>
#include <dev/i2c/i2c_io.h>
#include <sys/timespec.h>
#include <time.h>

int i2c_write(int fd, int addr, uint8_t *cmd, size_t cmdlen,
		uint8_t *buf, size_t buflen) {

	i2c_ioctl_exec_t i2cop;

	i2cop.iie_op =  I2C_OP_WRITE_WITH_STOP; /* データの連続書き込み */
	i2cop.iie_addr = (i2c_addr_t)addr;      /* スレーブアドレス */
	i2cop.iie_cmd = cmd;                    /* コマンドポインタ */
	i2cop.iie_cmdlen = cmdlen;              /* コマンドの長さ */
	i2cop.iie_buf = buf;                    /* データバッファポインタ */
	i2cop.iie_buflen = buflen;              /* データ長 */
	return ioctl( fd, I2C_IOCTL_EXEC, &i2cop);  /* ioctl発行 */
}

int setup(int fd) {
	int addr = 0x3e;
        uint8_t cmd = 0x00;
	uint8_t setup1[] = { 0x38, 0x39, 0x14, 0x70,0x56, 0x6c };
	uint8_t setup2[] = { 0x38, 0x0C, 0x01 };

	if (i2c_write(fd, addr, &cmd, 1, setup1, 6)==-1)
		return -1;
	usleep (200 * 1000); /* 200ms */
	if (i2c_write(fd, addr, &cmd, 1, setup2, 3)==-1)
		return -2;
	usleep (2 * 1000); /* 2ms */
	return 0;
}

int display(int fd) {
	int addr = 0x3e;
	uint8_t cmd = 0x00;
	uint8_t pos;

	char text1[]="NetBSD";
	char text2[]="evbarm";

	pos = (uint8_t)0x81;		/* 位置 (0x80 | (row << 6) | col) */
	if (i2c_write(fd, addr, &cmd, 1, &pos, 1)==-1)
		return -1;
	cmd = 0x40;     		/* データ設定コマンド*/
	if (i2c_write(fd, addr, &cmd, 1, text1, strlen(text1))==-1)
		return -2;
	cmd = 0x00;			/* 制御コマンド */
	pos = (uint8_t)(0x80 | (1<<6) | 2); 	/* 下行の3文字目から */
	if (i2c_write(fd, addr, &cmd, 1, &pos, 1)==-1)
		return -3;
	cmd = 0x40;     		/* データ設定コマンド */
	if (i2c_write(fd, addr, &cmd, 1, text2, strlen(text2)) ==-1)
		return -4;
	return 0;
} 

int main() {
	int i2cfd;
	int r;

	struct timespec t = { 0, 300000000};

	if ((i2cfd = open("/dev/iic1", O_RDWR)) == -1 ) 
		err(1,"open");

	if (r=setup(i2cfd)) 
		err(1,"setup %d",r);
	if (r=display(i2cfd))
		err(1,"display %d",r);

}