ALSA: fireface: pick up time stamp for request subaction of asynchronous transaction

The time stamp of isochronous cycle at which asynchronous transaction is
sent is perhaps useful somehow. A commit b2405aa948b9 ("firewire: add
kernel API to access packet structure in request structure for AR context")
adds kernel API to retrieve the time stamp in inner structure of request
subaction.

This commit changes local framework to handle message delivered by the
asynchronous transaction so that time stamp is picked up by the kernel API.

Signed-off-by: Takashi Sakamoto <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/firewire/fireface/ff-protocol-former.c

···
 // A write transaction to clear registered higher 4 bytes of destination address
 // has an effect to suppress asynchronous transaction from device.
 static void ff800_handle_midi_msg(struct snd_ff *ff, unsigned int offset, const __le32 *buf,
-				  size_t length)
+				  size_t length, u32 tstamp)
 {
 	int i;
 
···
 // in its lower offset and expects userspace application to configure the
 // register for it.
 static void ff400_handle_msg(struct snd_ff *ff, unsigned int offset, const __le32 *buf,
-			     size_t length)
+			     size_t length, u32 tstamp)
 {
 	int i;
 

sound/firewire/fireface/ff-protocol-latter.c

···
 // (0x'....'....'0000'0000) and expects userspace application to configure the
 // register for it.
 static void latter_handle_midi_msg(struct snd_ff *ff, unsigned int offset, const __le32 *buf,
-				   size_t length)
+				   size_t length, u32 tstamp)
 {
 	u32 data = le32_to_cpu(*buf);
 	unsigned int index = (data & 0x000000f0) >> 4;

sound/firewire/fireface/ff-transaction.c

···
 {
 	struct snd_ff *ff = callback_data;
 	__le32 *buf = data;
+	u32 tstamp = fw_request_get_timestamp(request);
 
 	fw_send_response(card, request, RCODE_COMPLETE);
 
 	offset -= ff->async_handler.offset;
-	ff->spec->protocol->handle_msg(ff, (unsigned int)offset, buf, length);
+	ff->spec->protocol->handle_msg(ff, (unsigned int)offset, buf, length, tstamp);
 }
 
 static int allocate_own_address(struct snd_ff *ff, int i)

sound/firewire/fireface/ff.h

···
 
 struct snd_ff_protocol {
 	void (*handle_msg)(struct snd_ff *ff, unsigned int offset, const __le32 *buf,
-			   size_t length);
+			   size_t length, u32 tstamp);
 	int (*fill_midi_msg)(struct snd_ff *ff,
 			     struct snd_rawmidi_substream *substream,
 			     unsigned int port);