ACPI: utils: Introduce acpi_get_local_address()

Introduce a wrapper around the _ADR evaluation.

Signed-off-by: Calvin Johnson <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Ioana Ciornei <[e-mail]>
Acked-by: Rafael J. Wysocki <[e-mail]>
Acked-by: Grant Likely <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/acpi/utils.c

···
 
 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

···
 }
 #endif
 
+int acpi_get_local_address(acpi_handle handle, u32 *addr);
+
 #else	/* !CONFIG_ACPI */
 
 #define acpi_disabled 1
···
 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 */