[PATCH v4 2/4] ACPI: property: Add acpi_fwnode_name()

[Heikki Krogerus]

This implements the get_name fwnode op for ACPI.

Signed-off-by: Heikki Krogerus <heikki.kroge...@linux.intel.com>
---
 drivers/acpi/property.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index 8c7c4583b52d..c24cf02e9214 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -1219,6 +1219,33 @@ acpi_graph_get_remote_endpoint(const struct 
fwnode_handle *__fwnode)
        return acpi_graph_get_child_prop_value(fwnode, "endpoint", endpoint_nr);
 }
 
+static int
+acpi_fwnode_get_name(const struct fwnode_handle *fwnode, char *buf, size_t len)
+{
+       struct acpi_buffer buffer;
+       acpi_status status;
+
+       if (is_acpi_data_node(fwnode)) {
+               if (len < strlen(to_acpi_data_node(fwnode)->name) + 1)
+                       return -EOVERFLOW;
+               sprintf(buf, "%s", to_acpi_data_node(fwnode)->name);
+               return 0;
+       }
+
+       if (len < ACPI_NAME_SIZE + 1)
+               return -EOVERFLOW;
+
+       buffer.length = ACPI_NAME_SIZE + 1;
+       buffer.pointer = buf;
+
+       status = acpi_get_name(to_acpi_device_node(fwnode)->handle,
+                              ACPI_SINGLE_NAME, &buffer);
+       if (ACPI_FAILURE(status))
+               return -ENXIO;
+
+       return 0;
+}
+
 static bool acpi_fwnode_device_is_available(const struct fwnode_handle *fwnode)
 {
        if (!is_acpi_device_node(fwnode))
@@ -1310,6 +1337,7 @@ acpi_fwnode_device_get_match_data(const struct 
fwnode_handle *fwnode,
 
 #define DECLARE_ACPI_FWNODE_OPS(ops) \
        const struct fwnode_operations ops = {                          \
+               .get_name = acpi_fwnode_get_name,                       \
                .device_is_available = acpi_fwnode_device_is_available, \
                .device_get_match_data = acpi_fwnode_device_get_match_data, \
                .property_present = acpi_fwnode_property_present,       \
-- 
2.19.2