u-boot/post/drivers/i2c.c

/*
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * I2C test
 *
 * For verifying the I2C bus, a full I2C bus scanning is performed.
 *
 * #ifdef I2C_ADDR_LIST
 *   The test is considered as passed if all the devices and
 *   only the devices in the list are found.
 * #else [ ! I2C_ADDR_LIST ]
 *   The test is considered as passed if any I2C device is found.
 * #endif
 */

#include <common.h>
#include <post.h>
#include <i2c.h>

#if CONFIG_POST & CONFIG_SYS_POST_I2C

int i2c_post_test (int flags)
{
	unsigned int i;
#ifndef I2C_ADDR_LIST
	for (i = 0; i < 128; i++)
		if (i2c_probe (i) == 0)
			return 0;

	/* No devices found */
	return -1;
#else
	unsigned int ret  = 0;
	int j;
	const unsigned char i2c_addr_list[] = I2C_ADDR_LIST;

	for (i = 0; i < 128; i++) {
		if (i2c_probe(i) != 0)
			continue;

		for (j = 0; j < sizeof(i2c_addr_list); ++j) {
			if (i == i2c_addr_list[j]) {
				i2c_addr_list[j] = 0xff;
				break;
			}
		}

		if (j == sizeof(i2c_addr_list)) {
			ret = -1;
			post_log("I2C: addr %02x not expected\n", i);
		}
	}

	for (i = 0; i < sizeof(i2c_addr_list); ++i) {
		if (i2c_addr_list[i] == 0xff)
			continue;
		post_log("I2C: addr %02x did not respond\n", i2c_addr_list[i]);
		ret = -1;
	}

	return ret;
#endif
}

#endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */