1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *   serial-generic.c
5  *   Based on serial-u16550.c by Jaroslav Kysela <[email protected]>,
10  * Generic serial MIDI driver using the serdev serial bus API for hardware interaction
29 MODULE_DESCRIPTION("Generic serial MIDI driver");
58 	if (test_and_set_bit(SERIAL_TX_STATE_ACTIVE, &drvdata->tx_state))  in snd_serial_generic_tx_wakeup()
59 		set_bit(SERIAL_TX_STATE_WAKEUP, &drvdata->tx_state);  in snd_serial_generic_tx_wakeup()
61 	schedule_work(&drvdata->tx_work);  in snd_serial_generic_tx_wakeup()
72 	struct snd_rawmidi_substream *substream = drvdata->midi_output;  in snd_serial_generic_tx_work()
74 	clear_bit(SERIAL_TX_STATE_WAKEUP, &drvdata->tx_state);  in snd_serial_generic_tx_work()
78 		if (!test_bit(SERIAL_MODE_OUTPUT_OPEN, &drvdata->filemode))  in snd_serial_generic_tx_work()
82 		num_bytes = serdev_device_write_buf(drvdata->serdev, buf, num_bytes);  in snd_serial_generic_tx_work()
89 		if (!test_bit(SERIAL_TX_STATE_WAKEUP, &drvdata->tx_state))  in snd_serial_generic_tx_work()
93 	clear_bit(SERIAL_TX_STATE_ACTIVE, &drvdata->tx_state);  in snd_serial_generic_tx_work()
109 	if (!test_bit(SERIAL_MODE_INPUT_OPEN, &drvdata->filemode))  in snd_serial_generic_receive_buf()
112 	ret = snd_rawmidi_receive(drvdata->midi_input, buf, count);  in snd_serial_generic_receive_buf()
126 	if (drvdata->filemode)  in snd_serial_generic_ensure_serdev_open()
129 	dev_dbg(drvdata->card->dev, "Opening serial port for card %s\n",  in snd_serial_generic_ensure_serdev_open()
130 		drvdata->card->shortname);  in snd_serial_generic_ensure_serdev_open()
131 	err = serdev_device_open(drvdata->serdev);  in snd_serial_generic_ensure_serdev_open()
135 	actual_baud = serdev_device_set_baudrate(drvdata->serdev,  in snd_serial_generic_ensure_serdev_open()
136 		drvdata->baudrate);  in snd_serial_generic_ensure_serdev_open()
137 	if (actual_baud != drvdata->baudrate) {  in snd_serial_generic_ensure_serdev_open()
138 		dev_warn(drvdata->card->dev, "requested %d baud for card %s but it was actually set to %d\n",  in snd_serial_generic_ensure_serdev_open()
139 			drvdata->baudrate, drvdata->card->shortname, actual_baud);  in snd_serial_generic_ensure_serdev_open()
148 	struct snd_serial_generic *drvdata = substream->rmidi->card->private_data;  in snd_serial_generic_input_open()
150 	dev_dbg(drvdata->card->dev, "Opening input for card %s\n",  in snd_serial_generic_input_open()
151 		drvdata->card->shortname);  in snd_serial_generic_input_open()
157 	set_bit(SERIAL_MODE_INPUT_OPEN, &drvdata->filemode);  in snd_serial_generic_input_open()
158 	drvdata->midi_input = substream;  in snd_serial_generic_input_open()
164 	struct snd_serial_generic *drvdata = substream->rmidi->card->private_data;  in snd_serial_generic_input_close()
166 	dev_dbg(drvdata->card->dev, "Closing input for card %s\n",  in snd_serial_generic_input_close()
167 		drvdata->card->shortname);  in snd_serial_generic_input_close()
169 	clear_bit(SERIAL_MODE_INPUT_OPEN, &drvdata->filemode);  in snd_serial_generic_input_close()
170 	clear_bit(SERIAL_MODE_INPUT_TRIGGERED, &drvdata->filemode);  in snd_serial_generic_input_close()
172 	drvdata->midi_input = NULL;  in snd_serial_generic_input_close()
174 	if (!drvdata->filemode)  in snd_serial_generic_input_close()
175 		serdev_device_close(drvdata->serdev);  in snd_serial_generic_input_close()
182 	struct snd_serial_generic *drvdata = substream->rmidi->card->private_data;  in snd_serial_generic_input_trigger()
185 		set_bit(SERIAL_MODE_INPUT_TRIGGERED, &drvdata->filemode);  in snd_serial_generic_input_trigger()
187 		clear_bit(SERIAL_MODE_INPUT_TRIGGERED, &drvdata->filemode);  in snd_serial_generic_input_trigger()
192 	struct snd_serial_generic *drvdata = substream->rmidi->card->private_data;  in snd_serial_generic_output_open()
195 	dev_dbg(drvdata->card->dev, "Opening output for card %s\n",  in snd_serial_generic_output_open()
196 		drvdata->card->shortname);  in snd_serial_generic_output_open()
202 	set_bit(SERIAL_MODE_OUTPUT_OPEN, &drvdata->filemode);  in snd_serial_generic_output_open()
204 	drvdata->midi_output = substream;  in snd_serial_generic_output_open()
210 	struct snd_serial_generic *drvdata = substream->rmidi->card->private_data;  in snd_serial_generic_output_close()
212 	dev_dbg(drvdata->card->dev, "Closing output for card %s\n",  in snd_serial_generic_output_close()
213 		drvdata->card->shortname);  in snd_serial_generic_output_close()
215 	clear_bit(SERIAL_MODE_OUTPUT_OPEN, &drvdata->filemode);  in snd_serial_generic_output_close()
216 	clear_bit(SERIAL_MODE_OUTPUT_TRIGGERED, &drvdata->filemode);  in snd_serial_generic_output_close()
218 	if (!drvdata->filemode)  in snd_serial_generic_output_close()
219 		serdev_device_close(drvdata->serdev);  in snd_serial_generic_output_close()
221 	drvdata->midi_output = NULL;  in snd_serial_generic_output_close()
229 	struct snd_serial_generic *drvdata = substream->rmidi->card->private_data;  in snd_serial_generic_output_trigger()
232 		set_bit(SERIAL_MODE_OUTPUT_TRIGGERED, &drvdata->filemode);  in snd_serial_generic_output_trigger()
234 		clear_bit(SERIAL_MODE_OUTPUT_TRIGGERED, &drvdata->filemode);  in snd_serial_generic_output_trigger()
242 	struct snd_serial_generic *drvdata = substream->rmidi->card->private_data;  in snd_serial_generic_output_drain()
245 	serdev_device_write_flush(drvdata->serdev);  in snd_serial_generic_output_drain()
246 	cancel_work_sync(&drvdata->tx_work);  in snd_serial_generic_output_drain()
267 	err = of_property_read_u32(serdev->dev.of_node, "current-speed",  in snd_serial_generic_parse_dt()
268 		&drvdata->baudrate);  in snd_serial_generic_parse_dt()
270 		dev_dbg(drvdata->card->dev,  in snd_serial_generic_parse_dt()
271 			"MIDI device reading of current-speed DT param failed with error %d, using default of 38400\n",  in snd_serial_generic_parse_dt()
273 		drvdata->baudrate = 38400;  in snd_serial_generic_parse_dt()
282 	list_for_each_entry(substream, &stream->substreams, list) {  in snd_serial_generic_substreams()
283 		sprintf(substream->name, "Serial MIDI %d-%d", dev_num, substream->number);  in snd_serial_generic_substreams()
293 	err = snd_rawmidi_new(drvdata->card, drvdata->card->driver, 0,  in snd_serial_generic_rmidi()
303 	strcpy(rrawmidi->name, drvdata->card->shortname);  in snd_serial_generic_rmidi()
305 	snd_serial_generic_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],  in snd_serial_generic_rmidi()
306 					drvdata->serdev->ctrl->nr);  in snd_serial_generic_rmidi()
307 	snd_serial_generic_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],  in snd_serial_generic_rmidi()
308 					drvdata->serdev->ctrl->nr);  in snd_serial_generic_rmidi()
310 	rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |  in snd_serial_generic_rmidi()
325 	err  = snd_devm_card_new(&serdev->dev, SNDRV_DEFAULT_IDX1,  in snd_serial_generic_probe()
332 	strcpy(card->driver, "SerialMIDI");  in snd_serial_generic_probe()
333 	sprintf(card->shortname, "SerialMIDI-%d", serdev->ctrl->nr);  in snd_serial_generic_probe()
334 	sprintf(card->longname, "Serial MIDI device at serial%d", serdev->ctrl->nr);  in snd_serial_generic_probe()
336 	drvdata = card->private_data;  in snd_serial_generic_probe()
338 	drvdata->serdev = serdev;  in snd_serial_generic_probe()
339 	drvdata->card = card;  in snd_serial_generic_probe()
343 	INIT_WORK(&drvdata->tx_work, snd_serial_generic_tx_work);  in snd_serial_generic_probe()
345 	err = snd_serial_generic_rmidi(drvdata, 1, 1, &drvdata->rmidi);  in snd_serial_generic_probe()
350 	serdev_device_set_drvdata(drvdata->serdev, drvdata);  in snd_serial_generic_probe()
360 	{ .compatible = "serial-midi" },
368 		.name		= "snd-serial-generic",