[lm-sensors] Utility for creating computate sensors.conf lines for

[Hans de Goede <j.w.r.degoede@hhs.nl>]

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Hi all,

As discussed here is an utility for creating computate sensors.conf lines for 
fscher and newer from DMI tables.

I wrote it in C as I'm most fluent in that language. I've it attached, shall I 
import it somewhere under progs?

Regards,

Hans

[-- Attachment #2: fscher-dmi2compute.c --]
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#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>

int main(void)
{
   char buf[512];
   unsigned int x;
   FILE *f;
   int i, count, entities_found;;
   int in0_mult, in1_mult, in2_mult, in0_offset, in1_offset, in2_offset, vref;
   
   if (getuid())
   {
      fprintf(stderr, "Error this program must be run as root because it "
                      "invokes / uses dmidecode which requires root rights\n");
      return 1;
   }
   
   f = popen("/usr/sbin/dmidecode", "r");
   
   if (!f)
   {
      perror("Error invoking dmidecode failed");
      return 1;
   }
   
   while (fgets(buf, sizeof(buf), f))
   {
      if (strcmp(buf, "OEM-specific Type\n"))
         continue;

      if (!fgets(buf, sizeof(buf), f))
         break;

      if (strcmp(buf, "\tHeader and Data:\n"))
         continue;

      count = 0;
      entities_found = 0;
      
      while (fscanf(f, "%x", &x) == 1)
      {
         buf[count] = x;
         count++;
      }

      /* we are looking for what Siemens calls "subtype" 19, the subtype
         is stored in byte 5 of the dmi block */
      if (buf[4] != 19)
         continue;
         
      /* After the subtype comes 1 unknown byte and then blocks of 5 bytes,
         consisting of what Siemens calls an "Entity" number, followed by
         2 16 bit words in LSB first order */
      for (i = 6; (i + 4) < count; i += 5)
      {
         if (buf[i] == 1) /* entity 1 5 volt / in1 multiplier and offset */
         {
            in1_mult   = buf[i + 1] | (buf[i + 2] << 8);
            in1_offset = buf[i + 3] | (buf[i + 4] << 8);
            entities_found += 0x0001;
         }
         if (buf[i] == 2) /* entity 2 12 volt / in0 multiplier and offset */
         {
            in0_mult   = buf[i + 1] | (buf[i + 2] << 8);
            in0_offset = buf[i + 3] | (buf[i + 4] << 8);
            entities_found += 0x0010;
         }
         if (buf[i] == 3) /* entity 3 vbat / in2 multiplier and offset */
         {
            in2_mult   = buf[i + 1] | (buf[i + 2] << 8);
            in2_offset = buf[i + 3] | (buf[i + 4] << 8);
            entities_found += 0x0100;
         }
         if (buf[i] == 7) /* entity 7 reference voltage */
         {
            vref = buf[i + 1] | (buf[i + 2] << 8);
            entities_found += 0x1000;
         }
         
      }
      
      if (entities_found == 0x1111)
      {
         printf("    compute in0       (@ * (%d * %d) / 255) + (%d * 10), (@ - (%d * 10)) * 255 / (%d * %d)\n",
            in0_mult, vref, in0_offset, in0_offset, in0_mult, vref);
         printf("    compute in1       (@ * (%d * %d) / 255) + (%d * 10), (@ - (%d * 10)) * 255 / (%d * %d)\n",
            in1_mult, vref, in1_offset, in1_offset, in1_mult, vref);
         printf("    compute in2       (@ * (%d * %d) / 255) + (%d * 10), (@ - (%d * 10)) * 255 / (%d * %d)\n",
            in2_mult, vref, in2_offset, in2_offset, in2_mult, vref);
         fclose(f);
         return 0;
      }
   }
   
   fclose(f);

   return 0;
}

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