iwlwifi: acpi: make iwl_get_bios_mcc() use the common acpi functions

The way iwl_get_bios_mcc() gets the WiFi package and checks for its
integrity is almost identical to the new iwl_acpi_get_wifi_pkg()
function.  Instead of having duplicate code, convert it to use the
common code.
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/acpi.h

@@ -85,6 +85,7 @@
 #define ACPI_EWRD_WIFI_DATA_SIZE	((ACPI_SAR_PROFILE_NUM - 1) * \
 					 ACPI_SAR_TABLE_SIZE + 3)
 #define ACPI_WGDS_WIFI_DATA_SIZE	18
+#define ACPI_WRDD_WIFI_DATA_SIZE	2
 #define ACPI_SPLC_WIFI_DATA_SIZE	2
 
 #define ACPI_WGDS_NUM_BANDS		2

drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c

@@ -945,64 +945,36 @@ iwl_parse_nvm_mcc_info(struct device *dev, const struct iwl_cfg *cfg,
 }
 IWL_EXPORT_SYMBOL(iwl_parse_nvm_mcc_info);
 
-#ifdef CONFIG_ACPI
-static u32 iwl_wrdd_get_mcc(struct device *dev, union acpi_object *wrdd)
-{
-	union acpi_object *mcc_pkg, *domain_type, *mcc_value;
-	u32 i;
-
-	if (wrdd->type != ACPI_TYPE_PACKAGE ||
-	    wrdd->package.count < 2 ||
-	    wrdd->package.elements[0].type != ACPI_TYPE_INTEGER ||
-	    wrdd->package.elements[0].integer.value != 0) {
-		IWL_DEBUG_EEPROM(dev, "Unsupported wrdd structure\n");
-		return 0;
-	}
-
-	for (i = 1 ; i < wrdd->package.count ; ++i) {
-		mcc_pkg = &wrdd->package.elements[i];
-
-		if (mcc_pkg->type != ACPI_TYPE_PACKAGE ||
-		    mcc_pkg->package.count < 2 ||
-		    mcc_pkg->package.elements[0].type != ACPI_TYPE_INTEGER ||
-		    mcc_pkg->package.elements[1].type != ACPI_TYPE_INTEGER) {
-			mcc_pkg = NULL;
-			continue;
-		}
-
-		domain_type = &mcc_pkg->package.elements[0];
-		if (domain_type->integer.value == ACPI_WIFI_DOMAIN)
-			break;
-
-		mcc_pkg = NULL;
-	}
-
-	if (mcc_pkg) {
-		mcc_value = &mcc_pkg->package.elements[1];
-		return mcc_value->integer.value;
-	}
-
-	return 0;
-}
-
 int iwl_get_bios_mcc(struct device *dev, char *mcc)
 {
-	union acpi_object *data;
+	union acpi_object *wifi_pkg, *data;
 	u32 mcc_val;
+	int ret;
 
 	data = iwl_acpi_get_object(dev, ACPI_WRDD_METHOD);
 	if (IS_ERR(data))
 		return PTR_ERR(data);
 
-	mcc_val = iwl_wrdd_get_mcc(dev, data);
-	kfree(data);
-	if (!mcc_val)
-		return -ENOENT;
+	wifi_pkg = iwl_acpi_get_wifi_pkg(dev, data, ACPI_WRDD_WIFI_DATA_SIZE);
+	if (IS_ERR(wifi_pkg)) {
+		ret = PTR_ERR(wifi_pkg);
+		goto out_free;
+	}
+
+	if (wifi_pkg->package.elements[1].type != ACPI_TYPE_INTEGER) {
+		ret = -EINVAL;
+		goto out_free;
+	}
+
+	mcc_val = wifi_pkg->package.elements[1].integer.value;
 
 	mcc[0] = (mcc_val >> 8) & 0xff;
 	mcc[1] = mcc_val & 0xff;
 	mcc[2] = '\0';
-	return 0;
+
+	ret = 0;
+out_free:
+	kfree(data);
+	return ret;
 }
 IWL_EXPORT_SYMBOL(iwl_get_bios_mcc);
-#endif

drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.h

@@ -109,7 +109,6 @@ struct ieee80211_regdomain *
 iwl_parse_nvm_mcc_info(struct device *dev, const struct iwl_cfg *cfg,
 		       int num_of_ch, __le32 *channels, u16 fw_mcc);
 
-#ifdef CONFIG_ACPI
 /**
  * iwl_get_bios_mcc - read MCC from BIOS, if available
  *
@@ -119,11 +118,5 @@ iwl_parse_nvm_mcc_info(struct device *dev, const struct iwl_cfg *cfg,
  * This function tries to read the current MCC from ACPI if available.
  */
 int iwl_get_bios_mcc(struct device *dev, char *mcc);
-#else
-static inline int iwl_get_bios_mcc(struct device *dev, char *mcc)
-{
-	return -ENOENT;
-}
-#endif
 
 #endif /* __iwl_nvm_parse_h__ */