common/cmd_dtt.c

   1 /*
   2  * (C) Copyright 2001
   3  * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com
   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 #include <common.h>
  25 #include <config.h>
  26 #include <command.h>
  27
  28 #include <dtt.h>
  29 #include <i2c.h>
  30
  31 static unsigned long sensor_initialized;
  32
  33 static void _initialize_dtt(void)
  34 {
  35         int i;
  36         unsigned char sensors[] = CONFIG_DTT_SENSORS;
  37
  38         for (i = 0; i < sizeof(sensors); i++) {
  39                 if ((sensor_initialized & (1 << i)) == 0) {
  40                         if (dtt_init_one(sensors[i]) != 0) {
  41                                 printf("DTT%d: Failed init!\n", i);
  42                                 continue;
  43                         }
  44                         sensor_initialized |= (1 << i);
  45                 }
  46         }
  47 }
  48
  49 void dtt_init(void)
  50 {
  51         int old_bus;
  52
  53         /* switch to correct I2C bus */
  54         old_bus = I2C_GET_BUS();
  55         I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
  56
  57         _initialize_dtt();
  58
  59         /* switch back to original I2C bus */
  60         I2C_SET_BUS(old_bus);
  61 }
  62
  63 int do_dtt (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
  64 {
  65         int i;
  66         unsigned char sensors[] = CONFIG_DTT_SENSORS;
  67         int old_bus;
  68
  69         /* Force a compilation error, if there are more then 32 sensors */
  70         BUILD_BUG_ON(sizeof(sensors) > 32);
  71         /* switch to correct I2C bus */
  72         old_bus = I2C_GET_BUS();
  73         I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
  74
  75         _initialize_dtt();
  76
  77         /*
  78          * Loop through sensors, read
  79          * temperature, and output it.
  80          */
  81         for (i = 0; i < sizeof(sensors); i++)
  82                 printf("DTT%d: %i C\n", i + 1, dtt_get_temp(sensors[i]));
  83
  84         /* switch back to original I2C bus */
  85         I2C_SET_BUS(old_bus);
  86
  87         return 0;
  88 }       /* do_dtt() */
  89
  90 /***************************************************/
  91
  92 U_BOOT_CMD(
  93           dtt,  1,      1,      do_dtt,
  94           "Read temperature from Digital Thermometer and Thermostat",
  95           ""
  96 );