iwlwifi: acpi: move function to get mcc into acpi code

The iwl_get_bios_mcc() function was in the iwl-nvm-parse.c file, but
it has nothing to do with the NVM.  Move it to fw/acpi.c and rename it
to iwl_acpi_get_mcc().

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

2 files changed, 49 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
index 5a3b75e45f5c..adce36112b7f 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
@@ -147,3 +147,37 @@ found:
 	return wifi_pkg;
 }
 IWL_EXPORT_SYMBOL(iwl_acpi_get_wifi_pkg);
+
+int iwl_acpi_get_mcc(struct device *dev, char *mcc)
+{
+	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);
+
+	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';
+
+	ret = 0;
+out_free:
+	kfree(data);
+	return ret;
+}
+IWL_EXPORT_SYMBOL(iwl_acpi_get_mcc);
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/acpi.h b/drivers/net/wireless/intel/iwlwifi/fw/acpi.h
index a7deb62f3f86..fe9c1066c3b6 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.h
@@ -98,6 +98,16 @@ union acpi_object *iwl_acpi_get_wifi_pkg(struct device *dev,
 					 union acpi_object *data,
 					 int data_size);
 
+/**
+ * iwl_acpi_get_mcc - read MCC from ACPI, if available
+ *
+ * @dev: the struct device
+ * @mcc: output buffer (3 bytes) that will get the MCC
+ *
+ * This function tries to read the current MCC from ACPI if available.
+ */
+int iwl_acpi_get_mcc(struct device *dev, char *mcc);
+
 #else /* CONFIG_ACPI */
 
 static inline void *iwl_acpi_get_object(struct device *dev, acpi_string method)
@@ -112,5 +122,10 @@ static inline union acpi_object *iwl_acpi_get_wifi_pkg(struct device *dev,
 	return ERR_PTR(-ENOENT);
 }
 
+static inline int iwl_acpi_get_mcc(struct device *dev, char *mcc)
+{
+	return -ENOENT;
+}
+
 #endif /* CONFIG_ACPI */
 #endif /* __iwl_fw_acpi__ */