This commit copies MIDI capture functionality to merge scs1x module. The
features of payload in asynchronous transaction are:
* System exclusive messages for SCS1 are encoded without ID data. In this
encoding scheme, 4 bits in LSB are available. The bits are squashed in
payload byte. Thus, one payload byte transfers two MIDI messages.
* The first byte of payload byte means:
* 0x00: depending on second payload byte
* 0xf9: including escaped system exclusive messages for SCS1, up to
3 byte (= 6 MIDI messages)
* the others: including MIDI 1.0 messages
* the others: including escaped system exclusive messages for SCS1, up
to 64 bytes
Signed-off-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>
---
sound/firewire/oxfw/oxfw-scs1x.c | 182 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 180 insertions(+), 2 deletions(-)
diff --git a/sound/firewire/oxfw/oxfw-scs1x.c b/sound/firewire/oxfw/oxfw-scs1x.c
index c04c76e..5bf52b7 100644
--- a/sound/firewire/oxfw/oxfw-scs1x.c
+++ b/sound/firewire/oxfw/oxfw-scs1x.c
@@ -9,22 +9,200 @@
#include "oxfw.h"
+#define HSS1394_ADDRESS 0xc007dedadadaULL
+#define HSS1394_MAX_PACKET_SIZE 64
+
+#define HSS1394_TAG_USER_DATA 0x00
+#define HSS1394_TAG_CHANGE_ADDRESS 0xf1
+
+struct fw_scs1x {
+ struct snd_oxfw *oxfw;
+
+ /* For MIDI capture. */
+ struct fw_address_handler hss_handler;
+ u8 input_escape_count;
+ struct snd_rawmidi_substream *input;
+};
+
+static const u8 sysex_escape_prefix[] = {
+ 0xf0, /* SysEx begin */
+ 0x00, 0x01, 0x60, /* Stanton DJ */
+ 0x48, 0x53, 0x53, /* "HSS" */
+};
+
+static void midi_input_escaped_byte(struct snd_rawmidi_substream *stream,
+ u8 byte)
+{
+ u8 nibbles[2];
+
+ nibbles[0] = byte >> 4;
+ nibbles[1] = byte & 0x0f;
+ snd_rawmidi_receive(stream, nibbles, 2);
+}
+
+static void midi_input_byte(struct fw_scs1x *scs,
+ struct snd_rawmidi_substream *stream, u8 byte)
+{
+ const u8 eox = 0xf7;
+
+ if (scs->input_escape_count > 0) {
+ midi_input_escaped_byte(stream, byte);
+ scs->input_escape_count--;
+ if (scs->input_escape_count == 0)
+ snd_rawmidi_receive(stream, &eox, sizeof(eox));
+ } else if (byte == 0xf9) {
+ snd_rawmidi_receive(stream, sysex_escape_prefix,
+ ARRAY_SIZE(sysex_escape_prefix));
+ midi_input_escaped_byte(stream, 0x00);
+ midi_input_escaped_byte(stream, 0xf9);
+ scs->input_escape_count = 3;
+ } else {
+ snd_rawmidi_receive(stream, &byte, 1);
+ }
+}
+
+static void midi_input_packet(struct fw_scs1x *scs,
+ struct snd_rawmidi_substream *stream,
+ const u8 *data, unsigned int bytes)
+{
+ unsigned int i;
+ const u8 eox = 0xf7;
+
+ if (data[0] == HSS1394_TAG_USER_DATA) {
+ for (i = 1; i < bytes; ++i)
+ midi_input_byte(scs, stream, data[i]);
+ } else {
+ snd_rawmidi_receive(stream, sysex_escape_prefix,
+ ARRAY_SIZE(sysex_escape_prefix));
+ for (i = 0; i < bytes; ++i)
+ midi_input_escaped_byte(stream, data[i]);
+ snd_rawmidi_receive(stream, &eox, sizeof(eox));
+ }
+}
+
+static void handle_hss(struct fw_card *card, struct fw_request *request,
+ int tcode, int destination, int source, int generation,
+ unsigned long long offset, void *data, size_t length,
+ void *callback_data)
+{
+ struct fw_scs1x *scs = callback_data;
+ struct snd_rawmidi_substream *stream;
+ int rcode;
+
+ if (offset != scs->hss_handler.offset) {
+ rcode = RCODE_ADDRESS_ERROR;
+ goto end;
+ }
+ if (tcode != TCODE_WRITE_QUADLET_REQUEST &&
+ tcode != TCODE_WRITE_BLOCK_REQUEST) {
+ rcode = RCODE_TYPE_ERROR;
+ goto end;
+ }
+
+ if (length >= 1) {
+ stream = ACCESS_ONCE(scs->input);
+ if (stream)
+ midi_input_packet(scs, stream, data, length);
+ }
+
+ rcode = RCODE_COMPLETE;
+end:
+ fw_send_response(card, request, rcode);
+}
+
+static int midi_capture_open(struct snd_rawmidi_substream *stream)
+{
+ struct fw_scs1x *scs = stream->rmidi->private_data;
+
+ scs->input_escape_count = 0;
+
+ return 0;
+}
+
+static int midi_capture_close(struct snd_rawmidi_substream *stream)
+{
+ return 0;
+}
+
+static void midi_capture_trigger(struct snd_rawmidi_substream *stream, int up)
+{
+ struct fw_scs1x *scs = stream->rmidi->private_data;
+
+ ACCESS_ONCE(scs->input) = up ? stream : NULL;
+}
+
+static struct snd_rawmidi_ops capture_ops = {
+ .open = midi_capture_open,
+ .close = midi_capture_close,
+ .trigger = midi_capture_trigger,
+};
+
+static int register_address(struct snd_oxfw *oxfw)
+{
+ struct fw_scs1x *scs = oxfw->spec->private_data;
+ __be64 data;
+
+ data = cpu_to_be64(((u64)HSS1394_TAG_CHANGE_ADDRESS << 56) |
+ scs->hss_handler.offset);
+ return snd_fw_transaction(oxfw->unit, TCODE_WRITE_BLOCK_REQUEST,
+ HSS1394_ADDRESS, &data, sizeof(data), 0);
+}
+
static int scs1x_add(struct snd_oxfw *oxfw)
{
+ struct fw_scs1x *scs = oxfw->spec->private_data;
struct snd_rawmidi *rmidi;
int err;
- /* For backward compatibility to scs1x module, use unique name. */
- err = snd_rawmidi_new(oxfw->card, "SCS.1x", 0, 0, 0, &rmidi);
+ /* Allocate own handler for imcoming asynchronous transaction. */
+ scs->hss_handler.length = HSS1394_MAX_PACKET_SIZE;
+ scs->hss_handler.address_callback = handle_hss;
+ scs->hss_handler.callback_data = scs;
+ err = fw_core_add_address_handler(&scs->hss_handler,
+ &fw_high_memory_region);
if (err < 0)
return err;
+ /* Register the address. */
+ err = register_address(oxfw);
+ if (err < 0) {
+ fw_core_remove_address_handler(&scs->hss_handler);
+ return err;
+ }
+
+ /* For backward compatibility to scs1x module, use unique name. */
+ err = snd_rawmidi_new(oxfw->card, "SCS.1x", 0, 0, 1, &rmidi);
+ if (err < 0) {
+ fw_core_remove_address_handler(&scs->hss_handler);
+ return err;
+ }
+
snprintf(rmidi->name, sizeof(rmidi->name),
"%s MIDI", oxfw->card->shortname);
+ rmidi->info_flags = SNDRV_RAWMIDI_INFO_INPUT;
+ snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &capture_ops);
+ rmidi->private_data = scs;
return err;
}
+static void scs1x_update(struct snd_oxfw *oxfw)
+{
+ register_address(oxfw);
+}
+
+static void scs1x_remove(struct snd_oxfw *oxfw)
+{
+ struct fw_scs1x *scs = oxfw->spec->private_data;
+
+ ACCESS_ONCE(scs->input) = NULL;
+
+ fw_core_remove_address_handler(&scs->hss_handler);
+}
+
struct snd_oxfw_spec snd_oxfw_spec_scs1x = {
.add = scs1x_add,
+ .update = scs1x_update,
+ .remove = scs1x_remove,
+ .private_size = sizeof(struct fw_scs1x),
};
--
2.5.0
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