/*
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* (C) Copyright 2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* I2C test
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*
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* For verifying the I2C bus, a full I2C bus scanning is performed.
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*
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* #ifdef CONFIG_SYS_POST_I2C_ADDRS
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* The test is considered as passed if all the devices and only the devices
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* in the list are found.
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* #ifdef CONFIG_SYS_POST_I2C_IGNORES
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* Ignore devices listed in CONFIG_SYS_POST_I2C_IGNORES. These devices
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* are optional or not vital to board functionality.
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* #endif
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* #else [ ! CONFIG_SYS_POST_I2C_ADDRS ]
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* The test is considered as passed if any I2C device is found.
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* #endif
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*/
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#include <common.h>
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#include <post.h>
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#include <i2c.h>
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#if CONFIG_POST & CONFIG_SYS_POST_I2C
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static int i2c_ignore_device(unsigned int chip)
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{
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#ifdef CONFIG_SYS_POST_I2C_IGNORES
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const unsigned char i2c_ignore_list[] = CONFIG_SYS_POST_I2C_IGNORES;
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int i;
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for (i = 0; i < sizeof(i2c_ignore_list); i++)
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if (i2c_ignore_list[i] == chip)
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return 1;
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#endif
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return 0;
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}
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int i2c_post_test (int flags)
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{
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unsigned int i;
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#ifndef CONFIG_SYS_POST_I2C_ADDRS
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/* Start at address 1, address 0 is the general call address */
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for (i = 1; i < 128; i++) {
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if (i2c_ignore_device(i))
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continue;
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if (i2c_probe (i) == 0)
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return 0;
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}
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/* No devices found */
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return -1;
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#else
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unsigned int ret = 0;
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int j;
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unsigned char i2c_addr_list[] = CONFIG_SYS_POST_I2C_ADDRS;
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/* Start at address 1, address 0 is the general call address */
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for (i = 1; i < 128; i++) {
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if (i2c_ignore_device(i))
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continue;
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if (i2c_probe(i) != 0)
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continue;
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for (j = 0; j < sizeof(i2c_addr_list); ++j) {
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if (i == i2c_addr_list[j]) {
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i2c_addr_list[j] = 0xff;
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break;
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}
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}
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if (j == sizeof(i2c_addr_list)) {
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ret = -1;
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post_log("I2C: addr %02x not expected\n", i);
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}
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}
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for (i = 0; i < sizeof(i2c_addr_list); ++i) {
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if (i2c_addr_list[i] == 0xff)
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continue;
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if (i2c_ignore_device(i2c_addr_list[i]))
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continue;
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post_log("I2C: addr %02x did not respond\n", i2c_addr_list[i]);
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ret = -1;
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}
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return ret;
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#endif
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}
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#endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */
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