src/vendorcode/google/dsm_calib.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <drivers/vpd/vpd.h>
   5 #include <stdint.h>
   6 #include <string.h>
   7 #include <types.h>
   8 #include "dsm_calib.h"
   9
  10 #define DSM_BUF_LEN 128
  11 #define DSM_PREFIX "dsm_calib_"
  12
  13 enum cb_err get_dsm_calibration_from_key(const char *key, uint64_t *value)
  14 {
  15         static char buf[DSM_BUF_LEN];
  16         char *ret;
  17         long value_from_vpd;
  18
  19         if (strncmp(key, DSM_PREFIX, strlen(DSM_PREFIX))) {
  20                 printk(BIOS_ERR, "got invalid dsm_calib key: %s\n", key);
  21                 return CB_ERR;
  22         }
  23
  24         ret = vpd_gets(key, buf, DSM_BUF_LEN, VPD_RO);
  25         if (!ret) {
  26                 printk(BIOS_ERR, "failed to find key in VPD: %s\n", key);
  27                 return CB_ERR;
  28         }
  29
  30         value_from_vpd = atol(buf);
  31         if (value_from_vpd <= 0) {
  32                 printk(BIOS_ERR, "got invalid dsm_calib from VPD: %ld\n", value_from_vpd);
  33                 return CB_ERR;
  34         }
  35
  36         *value = value_from_vpd;
  37
  38         return CB_SUCCESS;
  39 }