axfer: print help for libffado backend

This commit adds help texts for libffado backend.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/axfer/xfer-libffado.c b/axfer/xfer-libffado.c
index 0052336d7d4a77da89add95494af8c859ef98f2b..a37cce68d209535ac68893af25324a8244eb6f9f 100644 (file)
--- a/axfer/xfer-libffado.c
+++ b/axfer/xfer-libffado.c
@@ -539,7 +539,16 @@ static void xfer_libffado_destroy(struct xfer_context *xfer)
 
 static void xfer_libffado_help(struct xfer_context *xfer)
 {
-       printf("      (placeholder)\n");
+       printf(
+"      -p, --port           decimal ID of port to decide 1394 OHCI controller for communication on IEEE 1394 bus\n"
+"      -n, --node           decimal ID of node to decide unit on IEEE 1394 bus for transmission of audio data frame\n"
+"      -g, --guid           hexadecimal ID for node on IEEE 1394 bus for transmission of audio data frame\n"
+"      --frames-per-period  the number of audio data frame to handle one operation (frame unit)\n"
+"      --periods-per-bufer  the number of periods in intermediate buffer between libffado (frame unit)\n"
+"      --slave              receive frames from the other Linux system on IEEE 1394 bus running with libffado.\n"
+"      --snoop              receive frames on packets of all isochronous channels.\n"
+"      --sched-priority     set SCHED_FIFO with given priority. see RLIMIT_RTPRIO in getrlimit(2).\n"
+       );
 }
 
 const struct xfer_data xfer_libffado = {