/*
 * This module is included only when loadtools are being built to run on the
 * GTA0x application processor (AP).  It provides automated modem power
 * control, i.e., coordinates modem power control with loadtools operations
 * for convenience.
 */

#include <sys/types.h>
#include <sys/file.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

/*
 * Check this pathname: it is correct for the kernel version I'm using
 * on my test GTA02, but it differs for some other kernel versions.
 */
static char modem_powerctl_pathname[] =
	"/sys/bus/platform/devices/gta02-pm-gsm.0/power_on";

void
set_gta_modem_power_ctrl(boolval)
{
	char strbuf[16];
	int len, fd;

	len = sprintf(strbuf, "%d\n", boolval);
	fd = open(modem_powerctl_pathname, O_WRONLY);
	if (fd < 0) {
		perror(modem_powerctl_pathname);
		exit(1);
	}
	write(fd, strbuf, len);
	close(fd);
}

void
fork_gta_modem_poweron()
{
	int i;

	i = fork();
	if (i < 0) {
		perror("fork");
		exit(1);
	}
	if (i)
		return;
	printf("Toggling %s\n", modem_powerctl_pathname);
	set_gta_modem_power_ctrl(0);
	usleep(350000);
	set_gta_modem_power_ctrl(1);
	exit(0);
}