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  }