1 /* 2 * (C) Copyright 2002 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * See file CREDITS for list of people who contributed to this 6 * project. 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of 11 * the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 * MA 02111-1307 USA 22 */ 23 24 /* 25 * I2C test 26 * 27 * For verifying the I2C bus, a full I2C bus scanning is performed. 28 * 29 * #ifdef CONFIG_SYS_POST_I2C_ADDRS 30 * The test is considered as passed if all the devices and 31 * only the devices in the list are found. 32 * #else [ ! CONFIG_SYS_POST_I2C_ADDRS ] 33 * The test is considered as passed if any I2C device is found. 34 * #endif 35 */ 36 37 #include <common.h> 38 #include <post.h> 39 #include <i2c.h> 40 41 #if CONFIG_POST & CONFIG_SYS_POST_I2C 42 43 int i2c_post_test (int flags) 44 { 45 unsigned int i; 46 #ifndef CONFIG_SYS_POST_I2C_ADDRS 47 /* Start at address 1, address 0 is the general call address */ 48 for (i = 1; i < 128; i++) 49 if (i2c_probe (i) == 0) 50 return 0; 51 52 /* No devices found */ 53 return -1; 54 #else 55 unsigned int ret = 0; 56 int j; 57 const unsigned char i2c_addr_list[] = CONFIG_SYS_POST_I2C_ADDRS; 58 59 /* Start at address 1, address 0 is the general call address */ 60 for (i = 1; i < 128; i++) { 61 if (i2c_probe(i) != 0) 62 continue; 63 64 for (j = 0; j < sizeof(i2c_addr_list); ++j) { 65 if (i == i2c_addr_list[j]) { 66 i2c_addr_list[j] = 0xff; 67 break; 68 } 69 } 70 71 if (j == sizeof(i2c_addr_list)) { 72 ret = -1; 73 post_log("I2C: addr %02x not expected\n", i); 74 } 75 } 76 77 for (i = 0; i < sizeof(i2c_addr_list); ++i) { 78 if (i2c_addr_list[i] == 0xff) 79 continue; 80 post_log("I2C: addr %02x did not respond\n", i2c_addr_list[i]); 81 ret = -1; 82 } 83 84 return ret; 85 #endif 86 } 87 88 #endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */ 89