static void async_midi_port_callback(struct fw_card *card, int rcode,
void *data, size_t length,
void *callback_data)
{
struct snd_fw_async_midi_port *port = callback_data;
struct snd_rawmidi_substream *substream = ACCESS_ONCE(port->substream);
/* This port is closed. */
if (substream == NULL)
return;
if (rcode == RCODE_COMPLETE)
snd_rawmidi_transmit_ack(substream, port->consume_bytes);
else if (!rcode_is_permanent_error(rcode))
/* To start next transaction immediately for recovery. */
port->next_ktime = ktime_set(0, 0);
else
/* Don't continue processing. */
port->error = true;
port->idling = true;
if (!snd_rawmidi_transmit_empty(substream))
schedule_work(&port->work);
}
static void snd_echo_midi_output_write(unsigned long data)
{
struct echoaudio *chip = (struct echoaudio *)data;
unsigned long flags;
int bytes, sent, time;
unsigned char buf[MIDI_OUT_BUFFER_SIZE - 1];
DE_MID(("snd_echo_midi_output_write\n"));
/* No interrupts are involved: we have to check at regular intervals
if the card's output buffer has room for new data. */
sent = bytes = 0;
spin_lock_irqsave(&chip->lock, flags);
chip->midi_full = 0;
if (!snd_rawmidi_transmit_empty(chip->midi_out)) {
bytes = snd_rawmidi_transmit_peek(chip->midi_out, buf,
MIDI_OUT_BUFFER_SIZE - 1);
DE_MID(("Try to send %d bytes...\n", bytes));
sent = write_midi(chip, buf, bytes);
if (sent < 0) {
dev_err(chip->card->dev,
"write_midi() error %d\n", sent);
/* retry later */
sent = 9000;
chip->midi_full = 1;
} else if (sent > 0) {
DE_MID(("%d bytes sent\n", sent));
snd_rawmidi_transmit_ack(chip->midi_out, sent);
} else {
/* Buffer is full. DSP's internal buffer is 64 (128 ?)
bytes long. Let's wait until half of them are sent */
DE_MID(("Full\n"));
sent = 32;
chip->midi_full = 1;
}
}
/* We restart the timer only if there is some data left to send */
if (!snd_rawmidi_transmit_empty(chip->midi_out) && chip->tinuse) {
/* The timer will expire slightly after the data has been
sent */
time = (sent << 3) / 25 + 1; /* 8/25=0.32ms to send a byte */
mod_timer(&chip->timer, jiffies + (time * HZ + 999) / 1000);
DE_MID(("Timer armed(%d)\n", ((time * HZ + 999) / 1000)));
}
spin_unlock_irqrestore(&chip->lock, flags);
}
void snd_hdjmidi_output_trigger(snd_rawmidi_substream_t *substream, int up_param)
#endif
{
struct hdjmidi_out_port* port = (struct hdjmidi_out_port*)substream->runtime->private_data;
#ifdef RENDER_DATA_PRINTK
snd_printk(KERN_INFO"%s(): up:%d\n",__FUNCTION__,up_param);
#endif
port->active = up_param;
if (up_param) {
if (atomic_read(&port->ep->umidi->chip->shutdown)==1) {
/* gobble up remaining bytes to prevent wait in
* snd_rawmidi_drain_output */
while (!snd_rawmidi_transmit_empty(substream))
snd_rawmidi_transmit_ack(substream, 1);
return;
}
if (atomic_read(&port->ep->umidi->chip->no_urb_submission)!=0) {
return;
}
tasklet_hi_schedule(&port->ep->tasklet);
}
}
static void midi_port_work(struct work_struct *work)
{
struct snd_fw_async_midi_port *port =
container_of(work, struct snd_fw_async_midi_port, work);
struct snd_rawmidi_substream *substream = ACCESS_ONCE(port->substream);
int generation;
int type;
/* Under transacting or error state. */
if (!port->idling || port->error)
return;
/* Nothing to do. */
if (substream == NULL || snd_rawmidi_transmit_empty(substream))
return;
/* Do it in next chance. */
if (ktime_after(port->next_ktime, ktime_get())) {
schedule_work(&port->work);
return;
}
/*
* Fill the buffer. The callee must use snd_rawmidi_transmit_peek().
* Later, snd_rawmidi_transmit_ack() is called.
*/
memset(port->buf, 0, port->len);
port->consume_bytes = port->fill(substream, port->buf);
if (port->consume_bytes <= 0) {
/* Do it in next chance, immediately. */
if (port->consume_bytes == 0) {
port->next_ktime = ktime_set(0, 0);
schedule_work(&port->work);
} else {
/* Fatal error. */
port->error = true;
}
return;
}
/* Calculate type of transaction. */
if (port->len == 4)
type = TCODE_WRITE_QUADLET_REQUEST;
else
type = TCODE_WRITE_BLOCK_REQUEST;
/* Set interval to next transaction. */
port->next_ktime = ktime_add_ns(ktime_get(),
port->consume_bytes * 8 * NSEC_PER_SEC / 31250);
/* Start this transaction. */
port->idling = false;
/*
* In Linux FireWire core, when generation is updated with memory
* barrier, node id has already been updated. In this module, After
* this smp_rmb(), load/store instructions to memory are completed.
* Thus, both of generation and node id are available with recent
* values. This is a light-serialization solution to handle bus reset
* events on IEEE 1394 bus.
*/
generation = port->parent->generation;
smp_rmb();
fw_send_request(port->parent->card, &port->transaction, type,
port->parent->node_id, generation,
port->parent->max_speed, port->addr,
port->buf, port->len, async_midi_port_callback,
port);
}
