firewire: implement broadcast_channel CSR for 1394a compliance

See IEEE 1394a clause 8.3.2.3.11.

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

1 files changed, 17 insertions, 3 deletions

diff --git a/drivers/firewire/fw-transaction.c b/drivers/firewire/fw-transaction.c
index 03ae8a77c479..2f11ed1acf01 100644
--- a/drivers/firewire/fw-transaction.c
+++ b/drivers/firewire/fw-transaction.c
@@ -817,12 +817,13 @@ handle_registers(struct fw_card *card, struct fw_request *request,
         int reg = offset & ~CSR_REGISTER_BASE;
         unsigned long long bus_time;
         __be32 *data = payload;
+        int rcode = RCODE_COMPLETE;
 
         switch (reg) {
         case CSR_CYCLE_TIME:
         case CSR_BUS_TIME:
                 if (!TCODE_IS_READ_REQUEST(tcode) || length != 4) {
-                        fw_send_response(card, request, RCODE_TYPE_ERROR);
+                        rcode = RCODE_TYPE_ERROR;
                         break;
                 }
 
@@ -831,7 +832,17 @@ handle_registers(struct fw_card *card, struct fw_request *request,
                         *data = cpu_to_be32(bus_time);
                 else
                         *data = cpu_to_be32(bus_time >> 25);
-                fw_send_response(card, request, RCODE_COMPLETE);
+                break;
+
+        case CSR_BROADCAST_CHANNEL:
+                if (tcode == TCODE_READ_QUADLET_REQUEST)
+                        *data = cpu_to_be32(card->broadcast_channel);
+                else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
+                        card->broadcast_channel =
+                            (be32_to_cpu(*data) & BROADCAST_CHANNEL_VALID) |
+                            BROADCAST_CHANNEL_INITIAL;
+                else
+                        rcode = RCODE_TYPE_ERROR;
                 break;
 
         case CSR_BUS_MANAGER_ID:
@@ -850,10 +861,13 @@ handle_registers(struct fw_card *card, struct fw_request *request,
 
         case CSR_BUSY_TIMEOUT:
                 /* FIXME: Implement this. */
+
         default:
-                fw_send_response(card, request, RCODE_ADDRESS_ERROR);
+                rcode = RCODE_ADDRESS_ERROR;
                 break;
         }
+
+        fw_send_response(card, request, rcode);
 }
 
 static struct fw_address_handler registers = {