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#include <asm/byteorder.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <talloc/talloc.h>
#include <file/file.h>
#include "dt.h"
static int filter_sensors(const struct dirent *ent)
{
/* Check for prefix "sensor@" */
return strncmp(ent->d_name, "sensor@", strlen("sensor@")) == 0;
}
int get_ipmi_sensor(void *t, enum ipmi_sensor_ids sensor_id)
{
int rc, len, n;
struct dirent **namelist;
char *buf, *filename;
const char sensor_dir[] = "/proc/device-tree/bmc/sensors/";
n = scandir(sensor_dir, &namelist, filter_sensors, alphasort);
if (n <= 0)
return -1;
while (n--) {
filename = talloc_asprintf(t, "%s%s/ipmi-sensor-type",
sensor_dir, namelist[n]->d_name);
rc = read_file(t, filename, &buf, &len);
if (rc == 0 && len == 4 &&
__be32_to_cpu(*(uint32_t *)buf) == sensor_id)
break;
free(namelist[n]);
}
if (n < 0) {
rc = -1;
goto out;
}
filename = talloc_asprintf(t, "%s%s/reg", sensor_dir,
namelist[n]->d_name);
/* Free the rest of the scandir strings, if there are any */
do {
free(namelist[n]);
} while (n-- > 0);
rc = read_file(t, filename, &buf, &len);
if (rc != 0 || len != 4) {
rc = -1;
goto out;
}
rc = __be32_to_cpu(*(uint32_t *)buf);
out:
talloc_free(buf);
free(namelist);
return rc;
}
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