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 #include <linux/bug.h>
  16
  17 #if defined CONFIG_DTT_SENSORS
  18 static unsigned long sensor_initialized;
  19
  20 static void _initialize_dtt(void)
  21 {
  22         int i;
  23         unsigned char sensors[] = CONFIG_DTT_SENSORS;
  24
  25         for (i = 0; i < sizeof(sensors); i++) {
  26                 if ((sensor_initialized & (1 << i)) == 0) {
  27                         if (dtt_init_one(sensors[i]) != 0) {
  28                                 printf("DTT%d: Failed init!\n", i);
  29                                 continue;
  30                         }
  31                         sensor_initialized |= (1 << i);
  32                 }
  33         }
  34 }
  35
  36 void dtt_init(void)
  37 {
  38         int old_bus;
  39
  40         /* switch to correct I2C bus */
  41         old_bus = I2C_GET_BUS();
  42         I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
  43
  44         _initialize_dtt();
  45
  46         /* switch back to original I2C bus */
  47         I2C_SET_BUS(old_bus);
  48 }
  49 #endif
  50
  51 int dtt_i2c(void)
  52 {
  53 #if defined CONFIG_DTT_SENSORS
  54         int i;
  55         unsigned char sensors[] = CONFIG_DTT_SENSORS;
  56         int old_bus;
  57
  58         /* Force a compilation error, if there are more then 32 sensors */
  59         BUILD_BUG_ON(sizeof(sensors) > 32);
  60         /* switch to correct I2C bus */
  61 #ifdef CONFIG_SYS_I2C
  62         old_bus = i2c_get_bus_num();
  63         i2c_set_bus_num(CONFIG_SYS_DTT_BUS_NUM);
  64 #else
  65         old_bus = I2C_GET_BUS();
  66         I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
  67 #endif
  68
  69         _initialize_dtt();
  70
  71         /*
  72          * Loop through sensors, read
  73          * temperature, and output it.
  74          */
  75         for (i = 0; i < sizeof(sensors); i++)
  76                 printf("DTT%d: %i C\n", i + 1, dtt_get_temp(sensors[i]));
  77
  78         /* switch back to original I2C bus */
  79 #ifdef CONFIG_SYS_I2C
  80         i2c_set_bus_num(old_bus);
  81 #else
  82         I2C_SET_BUS(old_bus);
  83 #endif
  84 #endif
  85
  86         return 0;
  87 }
  88
  89 int dtt_tmu(void)
  90 {
  91 #if defined CONFIG_TMU_CMD_DTT
  92         int cur_temp;
  93
  94         /* Sense and return latest thermal info */
  95         if (tmu_monitor(&cur_temp) == TMU_STATUS_INIT) {
  96                 puts("TMU is in unknown state, temperature is invalid\n");
  97                 return -1;
  98         }
  99         printf("Current temperature: %u degrees Celsius\n", cur_temp);
 100 #endif
 101         return 0;
 102 }
 103
 104 int do_dtt(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 105 {
 106         int err = 0;
 107
 108         err |= dtt_i2c();
 109         err |= dtt_tmu();
 110
 111         return err;
 112 }       /* do_dtt() */
 113
 114 /***************************************************/
 115
 116 U_BOOT_CMD(
 117           dtt,  1,      1,      do_dtt,
 118           "Read temperature from Digital Thermometer and Thermostat",
 119           ""
 120 );