firewire: add fw_csr_string() helper function

The core (sysfs attributes), the firedtv driver, and possible future
drivers all read strings from some configuration ROM directory.  Factor
out the generic code from show_text_leaf() into a new helper function,
modified slightly to handle arbitrary buffer sizes.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/firewire.h b/include/linux/firewire.h
index a0e67150a729..5246869d8083 100644
--- a/include/linux/firewire.h
+++ b/include/linux/firewire.h
@@ -72,6 +72,8 @@ struct fw_csr_iterator {
 void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 *p);
 int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value);
 
+int fw_csr_string(u32 *directory, int key, char *buf, size_t size);
+
 extern struct bus_type fw_bus_type;
 
 struct fw_card_driver;