3    Copyright Echo Digital Audio Corporation (c) 1998 - 2004
21    Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22    MA  02111-1307, USA.
26  Translation from C++ and adaptation for use in ALSA-Driver
39 	dev_dbg(chip->card->dev, "enable_midi_input(%d)\n", enable);  in enable_midi_input()
42 		return -EIO;  in enable_midi_input()
45 		chip->mtc_state = MIDI_IN_STATE_NORMAL;  in enable_midi_input()
46 		chip->comm_page->flags |=  in enable_midi_input()
49 		chip->comm_page->flags &=  in enable_midi_input()
58 /* Send a buffer full of MIDI data to the DSP
63 		return -EINVAL;  in write_midi()
66 		return -EIO;  in write_midi()
72 	chip->comm_page->midi_output[0] = bytes;  in write_midi()
73 	memcpy(&chip->comm_page->midi_output[1], data, bytes);  in write_midi()
74 	chip->comm_page->midi_out_free_count = 0;  in write_midi()
77 	dev_dbg(chip->card->dev, "write_midi: %d\n", bytes);  in write_midi()
85 this state machine to parse the incoming MIDI data stream.  Every time the DSP
86 sees a 0xF1 byte come in, it adds the DSP sample position to the MIDI data
87 stream. The DSP sample position is represented as a 32 bit unsigned value,
92 	switch (chip->mtc_state) {  in mtc_process_data()
95 			chip->mtc_state = MIDI_IN_STATE_TS_HIGH;  in mtc_process_data()
98 		chip->mtc_state = MIDI_IN_STATE_TS_LOW;  in mtc_process_data()
102 		chip->mtc_state = MIDI_IN_STATE_F1_DATA;  in mtc_process_data()
106 		chip->mtc_state = MIDI_IN_STATE_NORMAL;  in mtc_process_data()
115 from the DSP's buffer.  It returns the number of bytes received. */
121 	count = le16_to_cpu(chip->comm_page->midi_input[0]);  in midi_service_irq()
131 		midi_byte = le16_to_cpu(chip->comm_page->midi_input[i]);  in midi_service_irq()
142 		chip->midi_buffer[received++] = (u8)midi_byte;  in midi_service_irq()
157 	struct echoaudio *chip = substream->rmidi->private_data;  in snd_echo_midi_input_open()
159 	chip->midi_in = substream;  in snd_echo_midi_input_open()
168 	struct echoaudio *chip = substream->rmidi->private_data;  in snd_echo_midi_input_trigger()
170 	if (up != chip->midi_input_enabled) {  in snd_echo_midi_input_trigger()
171 		spin_lock_irq(&chip->lock);  in snd_echo_midi_input_trigger()
173 		spin_unlock_irq(&chip->lock);  in snd_echo_midi_input_trigger()
174 		chip->midi_input_enabled = up;  in snd_echo_midi_input_trigger()
182 	struct echoaudio *chip = substream->rmidi->private_data;  in snd_echo_midi_input_close()
184 	chip->midi_in = NULL;  in snd_echo_midi_input_close()
192 	struct echoaudio *chip = substream->rmidi->private_data;  in snd_echo_midi_output_open()
194 	chip->tinuse = 0;  in snd_echo_midi_output_open()
195 	chip->midi_full = 0;  in snd_echo_midi_output_open()
196 	chip->midi_out = substream;  in snd_echo_midi_output_open()
204 	struct echoaudio *chip = from_timer(chip, t, timer);  in snd_echo_midi_output_write()
207 	unsigned char buf[MIDI_OUT_BUFFER_SIZE - 1];  in snd_echo_midi_output_write()
212 	spin_lock_irqsave(&chip->lock, flags);  in snd_echo_midi_output_write()
213 	chip->midi_full = 0;  in snd_echo_midi_output_write()
214 	if (!snd_rawmidi_transmit_empty(chip->midi_out)) {  in snd_echo_midi_output_write()
215 		bytes = snd_rawmidi_transmit_peek(chip->midi_out, buf,  in snd_echo_midi_output_write()
216 						  MIDI_OUT_BUFFER_SIZE - 1);  in snd_echo_midi_output_write()
217 		dev_dbg(chip->card->dev, "Try to send %d bytes...\n", bytes);  in snd_echo_midi_output_write()
220 			dev_err(chip->card->dev,  in snd_echo_midi_output_write()
224 			chip->midi_full = 1;  in snd_echo_midi_output_write()
226 			dev_dbg(chip->card->dev, "%d bytes sent\n", sent);  in snd_echo_midi_output_write()
227 			snd_rawmidi_transmit_ack(chip->midi_out, sent);  in snd_echo_midi_output_write()
229 			/* Buffer is full. DSP's internal buffer is 64 (128 ?)  in snd_echo_midi_output_write()
231 			dev_dbg(chip->card->dev, "Full\n");  in snd_echo_midi_output_write()
233 			chip->midi_full = 1;  in snd_echo_midi_output_write()
237 	/* We restart the timer only if there is some data left to send */  in snd_echo_midi_output_write()
238 	if (!snd_rawmidi_transmit_empty(chip->midi_out) && chip->tinuse) {  in snd_echo_midi_output_write()
239 		/* The timer will expire slightly after the data has been  in snd_echo_midi_output_write()
242 		mod_timer(&chip->timer, jiffies + (time * HZ + 999) / 1000);  in snd_echo_midi_output_write()
243 		dev_dbg(chip->card->dev,  in snd_echo_midi_output_write()
244 			"Timer armed(%d)\n", ((time * HZ + 999) / 1000));  in snd_echo_midi_output_write()
246 	spin_unlock_irqrestore(&chip->lock, flags);  in snd_echo_midi_output_write()
254 	struct echoaudio *chip = substream->rmidi->private_data;  in snd_echo_midi_output_trigger()
256 	dev_dbg(chip->card->dev, "snd_echo_midi_output_trigger(%d)\n", up);  in snd_echo_midi_output_trigger()
257 	spin_lock_irq(&chip->lock);  in snd_echo_midi_output_trigger()
259 		if (!chip->tinuse) {  in snd_echo_midi_output_trigger()
260 			timer_setup(&chip->timer, snd_echo_midi_output_write,  in snd_echo_midi_output_trigger()
262 			chip->tinuse = 1;  in snd_echo_midi_output_trigger()
265 		if (chip->tinuse) {  in snd_echo_midi_output_trigger()
266 			chip->tinuse = 0;  in snd_echo_midi_output_trigger()
267 			spin_unlock_irq(&chip->lock);  in snd_echo_midi_output_trigger()
268 			del_timer_sync(&chip->timer);  in snd_echo_midi_output_trigger()
269 			dev_dbg(chip->card->dev, "Timer removed\n");  in snd_echo_midi_output_trigger()
273 	spin_unlock_irq(&chip->lock);  in snd_echo_midi_output_trigger()
275 	if (up && !chip->midi_full)  in snd_echo_midi_output_trigger()
276 		snd_echo_midi_output_write(&chip->timer);  in snd_echo_midi_output_trigger()
283 	struct echoaudio *chip = substream->rmidi->private_data;  in snd_echo_midi_output_close()
285 	chip->midi_out = NULL;  in snd_echo_midi_output_close()
305 /* <--snd_echo_probe() */
311 	if ((err = snd_rawmidi_new(card, card->shortname, 0, 1, 1,  in snd_echo_midi_create()
312 				   &chip->rmidi)) < 0)  in snd_echo_midi_create()
315 	strcpy(chip->rmidi->name, card->shortname);  in snd_echo_midi_create()
316 	chip->rmidi->private_data = chip;  in snd_echo_midi_create()
318 	snd_rawmidi_set_ops(chip->rmidi, SNDRV_RAWMIDI_STREAM_INPUT,  in snd_echo_midi_create()
320 	snd_rawmidi_set_ops(chip->rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,  in snd_echo_midi_create()
323 	chip->rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |  in snd_echo_midi_create()