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ALSA: oxfw: copy handlers of asynchronous transaction for MIDI playback

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This commit copies some functions of asynchronous transactions for MIDI
playback, to merge scs1x module. The features of payload in asynchronous
transaction are the same as captured MIDI messages.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2015-12-22 09:15:43 +09:00 committed by Takashi Iwai
parent 8250427dc1
commit d7d20e7781
1 changed files with 161 additions and 0 deletions
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161
sound/firewire/oxfw/oxfw-scs1x.c
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@ -18,6 +18,20 @@ struct fw_scs1x {
struct fw_address_handler hss_handler;
u8 input_escape_count;
struct snd_rawmidi_substream *input;
/* For MIDI playback. */
struct snd_rawmidi_substream *output;
bool output_idle;
u8 output_status;
u8 output_bytes;
bool output_escaped;
bool output_escape_high_nibble;
struct tasklet_struct tasklet;
wait_queue_head_t idle_wait;
u8 buffer[HSS1394_MAX_PACKET_SIZE];
bool transaction_running;
struct fw_transaction transaction;
struct fw_device *fw_dev;
};
static const u8 sysex_escape_prefix[] = {
@ -106,6 +120,148 @@ end:
fw_send_response(card, request, rcode);
}
static void scs_write_callback(struct fw_card *card, int rcode,
void *data, size_t length, void *callback_data)
{
struct fw_scs1x *scs = callback_data;
if (rcode == RCODE_GENERATION)
; /* TODO: retry this packet */
scs->transaction_running = false;
tasklet_schedule(&scs->tasklet);
}
static bool is_valid_running_status(u8 status)
{
return status >= 0x80 && status <= 0xef;
}
static bool is_one_byte_cmd(u8 status)
{
return status == 0xf6 ||
status >= 0xf8;
}
static bool is_two_bytes_cmd(u8 status)
{
return (status >= 0xc0 && status <= 0xdf) ||
status == 0xf1 ||
status == 0xf3;
}
static bool is_three_bytes_cmd(u8 status)
{
return (status >= 0x80 && status <= 0xbf) ||
(status >= 0xe0 && status <= 0xef) ||
status == 0xf2;
}
static bool is_invalid_cmd(u8 status)
{
return status == 0xf4 ||
status == 0xf5 ||
status == 0xf9 ||
status == 0xfd;
}
static void scs_output_tasklet(unsigned long data)
{
struct fw_scs1x *scs = (struct fw_scs1x *)data;
struct snd_rawmidi_substream *stream;
unsigned int i;
u8 byte;
int generation;
if (scs->transaction_running)
return;
stream = ACCESS_ONCE(scs->output);
if (!stream) {
scs->output_idle = true;
wake_up(&scs->idle_wait);
return;
}
i = scs->output_bytes;
for (;;) {
if (snd_rawmidi_transmit(stream, &byte, 1) != 1) {
scs->output_bytes = i;
scs->output_idle = true;
wake_up(&scs->idle_wait);
return;
}
/*
* Convert from real MIDI to what I think the device expects (no
* running status, one command per packet, unescaped SysExs).
*/
if (scs->output_escaped && byte < 0x80) {
if (scs->output_escape_high_nibble) {
if (i < HSS1394_MAX_PACKET_SIZE) {
scs->buffer[i] = byte << 4;
scs->output_escape_high_nibble = false;
}
} else {
scs->buffer[i++] |= byte & 0x0f;
scs->output_escape_high_nibble = true;
}
} else if (byte < 0x80) {
if (i == 1) {
if (!is_valid_running_status(
scs->output_status))
continue;
scs->buffer[0] = HSS1394_TAG_USER_DATA;
scs->buffer[i++] = scs->output_status;
}
scs->buffer[i++] = byte;
if ((i == 3 && is_two_bytes_cmd(scs->output_status)) ||
(i == 4 && is_three_bytes_cmd(scs->output_status)))
break;
if (i == 1 + ARRAY_SIZE(sysex_escape_prefix) &&
!memcmp(scs->buffer + 1, sysex_escape_prefix,
ARRAY_SIZE(sysex_escape_prefix))) {
scs->output_escaped = true;
scs->output_escape_high_nibble = true;
i = 0;
}
if (i >= HSS1394_MAX_PACKET_SIZE)
i = 1;
} else if (byte == 0xf7) {
if (scs->output_escaped) {
if (i >= 1 && scs->output_escape_high_nibble &&
scs->buffer[0] !=
HSS1394_TAG_CHANGE_ADDRESS)
break;
} else {
if (i > 1 && scs->output_status == 0xf0) {
scs->buffer[i++] = 0xf7;
break;
}
}
i = 1;
scs->output_escaped = false;
} else if (!is_invalid_cmd(byte) && byte < 0xf8) {
i = 1;
scs->buffer[0] = HSS1394_TAG_USER_DATA;
scs->buffer[i++] = byte;
scs->output_status = byte;
scs->output_escaped = false;
if (is_one_byte_cmd(byte))
break;
}
}
scs->output_bytes = 1;
scs->output_escaped = false;
scs->transaction_running = true;
generation = scs->fw_dev->generation;
smp_rmb(); /* node_id vs. generation */
fw_send_request(scs->fw_dev->card, &scs->transaction,
TCODE_WRITE_BLOCK_REQUEST, scs->fw_dev->node_id,
generation, scs->fw_dev->max_speed, HSS1394_ADDRESS,
scs->buffer, i, scs_write_callback, scs);
}
static int midi_capture_open(struct snd_rawmidi_substream *stream)
{
return 0;
@ -166,6 +322,7 @@ int snd_oxfw_scs1x_add(struct snd_oxfw *oxfw)
scs = kzalloc(sizeof(struct fw_scs1x), GFP_KERNEL);
if (scs == NULL)
return -ENOMEM;
scs->fw_dev = fw_parent_device(oxfw->unit);
oxfw->spec = scs;
/* Allocate own handler for imcoming asynchronous transaction. */
@ -195,6 +352,10 @@ int snd_oxfw_scs1x_add(struct snd_oxfw *oxfw)
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
&midi_capture_ops);
tasklet_init(&scs->tasklet, scs_output_tasklet, (unsigned long)scs);
init_waitqueue_head(&scs->idle_wait);
scs->output_idle = true;
return 0;
err_allocated:
fw_core_remove_address_handler(&scs->hss_handler);