ACPI: utils: Introduce acpi_get_local_address()

Introduce a wrapper around the _ADR evaluation.
Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Acked-by: Grant Likely <grant.likely@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/acpi/utils.c

@@ -277,6 +277,20 @@ acpi_evaluate_integer(acpi_handle handle,
 
 EXPORT_SYMBOL(acpi_evaluate_integer);
 
+int acpi_get_local_address(acpi_handle handle, u32 *addr)
+{
+	unsigned long long adr;
+	acpi_status status;
+
+	status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
+	if (ACPI_FAILURE(status))
+		return -ENODATA;
+
+	*addr = (u32)adr;
+	return 0;
+}
+EXPORT_SYMBOL(acpi_get_local_address);
+
 acpi_status
 acpi_evaluate_reference(acpi_handle handle,
 			acpi_string pathname,

include/linux/acpi.h

@@ -710,6 +710,8 @@ static inline u64 acpi_arch_get_root_pointer(void)
 }
 #endif
 
+int acpi_get_local_address(acpi_handle handle, u32 *addr);
+
 #else	/* !CONFIG_ACPI */
 
 #define acpi_disabled 1
@@ -965,6 +967,11 @@ static inline struct acpi_device *acpi_resource_consumer(struct resource *res)
 	return NULL;
 }
 
+static inline int acpi_get_local_address(acpi_handle handle, u32 *addr)
+{
+	return -ENODEV;
+}
+
 #endif	/* !CONFIG_ACPI */
 
 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC