post/drivers/i2c.c

   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 I2C_ADDR_LIST
  30  *   The test is considered as passed if all the devices and
  31  *   only the devices in the list are found.
  32  * #else [ ! I2C_ADDR_LIST ]
  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 I2C_ADDR_LIST
  47         for (i = 0; i < 128; i++)
  48                 if (i2c_probe (i) == 0)
  49                         return 0;
  50
  51         /* No devices found */
  52         return -1;
  53 #else
  54         unsigned int ret  = 0;
  55         int j;
  56         const unsigned char i2c_addr_list[] = I2C_ADDR_LIST;
  57
  58         for (i = 0; i < 128; i++) {
  59                 if (i2c_probe(i) != 0)
  60                         continue;
  61
  62                 for (j = 0; j < sizeof(i2c_addr_list); ++j) {
  63                         if (i == i2c_addr_list[j]) {
  64                                 i2c_addr_list[j] = 0xff;
  65                                 break;
  66                         }
  67                 }
  68
  69                 if (j == sizeof(i2c_addr_list)) {
  70                         ret = -1;
  71                         post_log("I2C: addr %02x not expected\n", i);
  72                 }
  73         }
  74
  75         for (i = 0; i < sizeof(i2c_addr_list); ++i) {
  76                 if (i2c_addr_list[i] == 0xff)
  77                         continue;
  78                 post_log("I2C: addr %02x did not respond\n", i2c_addr_list[i]);
  79                 ret = -1;
  80         }
  81
  82         return ret;
  83 #endif
  84 }
  85
  86 #endif /* CONFIG_POST & CONFIG_SYS_POST_I2C */