1  /* SPDX-License-Identifier: GPL-2.0-only */
 2  #include <console/console.h>
 3  #include <cpu/cpu.h>
 4  #include <types.h>
 5  #include <string.h>
 6  #include <wrdd.h>
 7  #include <drivers/vpd/vpd.h>
 8  
 9  #define CROS_VPD_REGION_NAME	"region"
10  
11  /*
12   * wrdd_domain_value is ISO 3166-2
13   * ISO 3166-2 code consists of two parts, separated by a hyphen
14   * The first part is the ISO 3166-1 alpha-2 code of the country;
15   * The second part is a string of up to three alphanumeric characters
16   */
17  #define VARIANT_SEPARATOR '.'
18  struct wrdd_code_value_pair {
19  	const char *code;
20  	u16 value;
21  };
22  
23  /* Retrieve the regulatory domain information from VPD and
24   * return it as an uint16.
25   * WARNING: if domain information is not found in the VPD,
26   * this function will fall back to the default value
27   */
28  uint16_t wifi_regulatory_domain(void)
29  {
30  	static struct wrdd_code_value_pair wrdd_table[] = {
31  		{
32  			/* Indonesia
33  			 * Alpha-2 code         'ID'
34  			 * Full name            'the Republic of Indonesia'
35  			 * Alpha-3 code         'IDN'
36  			 * Numeric code         '360'
37  			 */
38  			.code = "id",
39  			.value = WRDD_REGULATORY_DOMAIN_INDONESIA
40  		}
41  	};
42  	const char *wrdd_domain_key = CROS_VPD_REGION_NAME;
43  	int i;
44  	struct wrdd_code_value_pair *p;
45  	/* wrdd_domain_value is ISO 3166-2 */
46  	char wrdd_domain_code[7];
47  	char *separator;
48  
49  	/* If not found for any reason fall backto the default value */
50  	if (!vpd_gets(wrdd_domain_key, wrdd_domain_code,
51  		ARRAY_SIZE(wrdd_domain_code), VPD_RO_THEN_RW)) {
52  		printk(BIOS_DEBUG,
53  		"Error: Could not locate '%s' in VPD\n", wrdd_domain_key);
54  		return WRDD_DEFAULT_REGULATORY_DOMAIN;
55  	}
56  	printk(BIOS_DEBUG, "Found '%s'='%s' in VPD\n",
57  		wrdd_domain_key, wrdd_domain_code);
58  	separator = memchr(wrdd_domain_code, VARIANT_SEPARATOR,
59  				ARRAY_SIZE(wrdd_domain_code));
60  	if (separator) {
61  		*separator = '\0';
62  	}
63  
64  	for (i = 0; i < ARRAY_SIZE(wrdd_table); i++) {
65  		p = &wrdd_table[i];
66  		if (strncmp(p->code, wrdd_domain_code,
67  			ARRAY_SIZE(wrdd_domain_code)) == 0)
68  			return p->value;
69  	}
70  	return WRDD_DEFAULT_REGULATORY_DOMAIN;
71  }