#include <sys/types.h>
#include "types.h"

#define	GPIO_OUT_REG	(*(volatile u16 *)0xFFFE4802)
#define	nCS4_ADDR0	(*(volatile u16 *)0x02800000)
#define	nCS4_ADDR2	(*(volatile u16 *)0x02800002)

fb_spca_write(addr, data)
{
	GPIO_OUT_REG &= 0xFF7F;
	nCS4_ADDR0 = addr;
	nCS4_ADDR2 = data;
}

void
cmd_spca(argbulk)
	char *argbulk;
{
	char *argv[3];
	u_long addr, data;

	if (parse_args(argbulk, 2, 2, argv, 0) < 0)
		return;
	if (parse_hexarg(argv[0], 4, &addr) < 0) {
		printf("ERROR: arg1 must be a valid 16-bit hex value\n");
		return;
	}
	if (parse_hexarg(argv[1], 4, &data) < 0) {
		printf("ERROR: arg2 must be a valid 16-bit hex value\n");
		return;
	}
	fb_spca_write(addr, data);
}

void
cmd_spcainit()
{
	/*
	 * Apparently we have to give it a reset pulse, then immediately
	 * do the black magic register write sequence.
	 */
	GPIO_OUT_REG = 0x0000;
	GPIO_OUT_REG = 0x0012;
	/* non-understandable voodoo copied from OsmocomBB */
	fb_spca_write(0x7e, 0x00);	/* internal register access */
	osmo_delay_ms(10);
	fb_spca_write(0x7a, 0x00);	/* keep CPU in reset state */
	osmo_delay_ms(10);
	fb_spca_write(0x7f, 0x00);	/* select main page */
	osmo_delay_ms(5);
	fb_spca_write(0x72, 0x07);	/* don't reshape timing, 16 bit mode */
	fb_spca_write(0x14, 0x03);
	fb_spca_write(0x7f, 0x00);	/* select main page */
	osmo_delay_ms(5);
	fb_spca_write(0x06, 0xff);
	fb_spca_write(0x7f, 0x09);
	fb_spca_write(0x19, 0x08);	/* backlight: 0x08 is on, 0x0c is off */
	fb_spca_write(0x23, 0x18);
}