src/vendorcode/google/chromeos/wrdd.c

   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 }