common/cmd_dtt.c

   1 /*
   2  * (C) Copyright 2001
   3  * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <config.h>
  10 #include <command.h>
  11
  12 #include <dtt.h>
  13 #include <i2c.h>
  14 #include <tmu.h>
  15
  16 #if defined CONFIG_DTT_SENSORS
  17 static unsigned long sensor_initialized;
  18
  19 static void _initialize_dtt(void)
  20 {
  21         int i;
  22         unsigned char sensors[] = CONFIG_DTT_SENSORS;
  23
  24         for (i = 0; i < sizeof(sensors); i++) {
  25                 if ((sensor_initialized & (1 << i)) == 0) {
  26                         if (dtt_init_one(sensors[i]) != 0) {
  27                                 printf("DTT%d: Failed init!\n", i);
  28                                 continue;
  29                         }
  30                         sensor_initialized |= (1 << i);
  31                 }
  32         }
  33 }
  34
  35 void dtt_init(void)
  36 {
  37         int old_bus;
  38
  39         /* switch to correct I2C bus */
  40         old_bus = I2C_GET_BUS();
  41         I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
  42
  43         _initialize_dtt();
  44
  45         /* switch back to original I2C bus */
  46         I2C_SET_BUS(old_bus);
  47 }
  48 #endif
  49
  50 int dtt_i2c(void)
  51 {
  52 #if defined CONFIG_DTT_SENSORS
  53         int i;
  54         unsigned char sensors[] = CONFIG_DTT_SENSORS;
  55         int old_bus;
  56
  57         /* Force a compilation error, if there are more then 32 sensors */
  58         BUILD_BUG_ON(sizeof(sensors) > 32);
  59         /* switch to correct I2C bus */
  60 #ifdef CONFIG_SYS_I2C
  61         old_bus = i2c_get_bus_num();
  62         i2c_set_bus_num(CONFIG_SYS_DTT_BUS_NUM);
  63 #else
  64         old_bus = I2C_GET_BUS();
  65         I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
  66 #endif
  67
  68         _initialize_dtt();
  69
  70         /*
  71          * Loop through sensors, read
  72          * temperature, and output it.
  73          */
  74         for (i = 0; i < sizeof(sensors); i++)
  75                 printf("DTT%d: %i C\n", i + 1, dtt_get_temp(sensors[i]));
  76
  77         /* switch back to original I2C bus */
  78 #ifdef CONFIG_SYS_I2C
  79         i2c_set_bus_num(old_bus);
  80 #else
  81         I2C_SET_BUS(old_bus);
  82 #endif
  83 #endif
  84
  85         return 0;
  86 }
  87
  88 int dtt_tmu(void)
  89 {
  90 #if defined CONFIG_TMU_CMD_DTT
  91         int cur_temp;
  92
  93         /* Sense and return latest thermal info */
  94         if (tmu_monitor(&cur_temp) == TMU_STATUS_INIT) {
  95                 puts("TMU is in unknown state, temperature is invalid\n");
  96                 return -1;
  97         }
  98         printf("Current temperature: %u degrees Celsius\n", cur_temp);
  99 #endif
 100         return 0;
 101 }
 102
 103 int do_dtt(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 104 {
 105         int err = 0;
 106
 107         err |= dtt_i2c();
 108         err |= dtt_tmu();
 109
 110         return err;
 111 }       /* do_dtt() */
 112
 113 /***************************************************/
 114
 115 U_BOOT_CMD(
 116           dtt,  1,      1,      do_dtt,
 117           "Read temperature from Digital Thermometer and Thermostat",
 118           ""
 119 );