mtpav.c

linux 内核源代码

		portp->mode |= MTPAV_MODE_INPUT_TRIGGERED;
	else
		portp->mode &= ~MTPAV_MODE_INPUT_TRIGGERED;
	spin_unlock_irqrestore(&mtp_card->spinlock, flags);

}


/*
 * timer interrupt for outputs
 */

static void snd_mtpav_output_timer(unsigned long data)
{
	unsigned long flags;
	struct mtpav *chip = (struct mtpav *)data;
	int p;

	spin_lock_irqsave(&chip->spinlock, flags);
	/* reprogram timer */
	chip->timer.expires = 1 + jiffies;
	add_timer(&chip->timer);
	/* process each port */
	for (p = 0; p <= chip->num_ports * 2 + MTPAV_PIDX_BROADCAST; p++) {
		struct mtpav_port *portp = &chip->ports[p];
		if ((portp->mode & MTPAV_MODE_OUTPUT_TRIGGERED) && portp->output)
			snd_mtpav_output_port_write(chip, portp, portp->output);
	}
	spin_unlock_irqrestore(&chip->spinlock, flags);
}

/* spinlock held! */
static void snd_mtpav_add_output_timer(struct mtpav *chip)
{
	chip->timer.expires = 1 + jiffies;
	add_timer(&chip->timer);
}

/* spinlock held! */
static void snd_mtpav_remove_output_timer(struct mtpav *chip)
{
	del_timer(&chip->timer);
}

/*
 */

static int snd_mtpav_output_open(struct snd_rawmidi_substream *substream)
{
	struct mtpav *mtp_card = substream->rmidi->private_data;
	struct mtpav_port *portp = &mtp_card->ports[substream->number];
	unsigned long flags;

	spin_lock_irqsave(&mtp_card->spinlock, flags);
	portp->mode |= MTPAV_MODE_OUTPUT_OPENED;
	portp->output = substream;
	spin_unlock_irqrestore(&mtp_card->spinlock, flags);
	return 0;
};

/*
 */

static int snd_mtpav_output_close(struct snd_rawmidi_substream *substream)
{
	struct mtpav *mtp_card = substream->rmidi->private_data;
	struct mtpav_port *portp = &mtp_card->ports[substream->number];
	unsigned long flags;

	spin_lock_irqsave(&mtp_card->spinlock, flags);
	portp->mode &= ~MTPAV_MODE_OUTPUT_OPENED;
	portp->output = NULL;
	spin_unlock_irqrestore(&mtp_card->spinlock, flags);
	return 0;
};

/*
 */

static void snd_mtpav_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
	struct mtpav *mtp_card = substream->rmidi->private_data;
	struct mtpav_port *portp = &mtp_card->ports[substream->number];
	unsigned long flags;

	spin_lock_irqsave(&mtp_card->spinlock, flags);
	if (up) {
		if (! (portp->mode & MTPAV_MODE_OUTPUT_TRIGGERED)) {
			if (mtp_card->istimer++ == 0)
				snd_mtpav_add_output_timer(mtp_card);
			portp->mode |= MTPAV_MODE_OUTPUT_TRIGGERED;
		}
	} else {
		portp->mode &= ~MTPAV_MODE_OUTPUT_TRIGGERED;
		if (--mtp_card->istimer == 0)
			snd_mtpav_remove_output_timer(mtp_card);
	}
	spin_unlock_irqrestore(&mtp_card->spinlock, flags);

	if (up)
		snd_mtpav_output_write(substream);
}

/*
 * midi interrupt for inputs
 */

static void snd_mtpav_inmidi_process(struct mtpav *mcrd, u8 inbyte)
{
	struct mtpav_port *portp;

	if ((int)mcrd->inmidiport > mcrd->num_ports * 2 + MTPAV_PIDX_BROADCAST)
		return;

	portp = &mcrd->ports[mcrd->inmidiport];
	if (portp->mode & MTPAV_MODE_INPUT_TRIGGERED)
		snd_rawmidi_receive(portp->input, &inbyte, 1);
}

static void snd_mtpav_inmidi_h(struct mtpav *mcrd, u8 inbyte)
{
	if (inbyte >= 0xf8) {
		/* real-time midi code */
		snd_mtpav_inmidi_process(mcrd, inbyte);
		return;
	}

	if (mcrd->inmidistate == 0) {	// awaiting command
		if (inbyte == 0xf5)	// MTP port #
			mcrd->inmidistate = 1;
		else
			snd_mtpav_inmidi_process(mcrd, inbyte);
	} else if (mcrd->inmidistate) {
		mcrd->inmidiport = translate_hwport_to_subdevice(mcrd, inbyte);
		mcrd->inmidistate = 0;
	}
}

static void snd_mtpav_read_bytes(struct mtpav *mcrd)
{
	u8 clrread, setread;
	u8 mtp_read_byte;
	u8 sr, cbyt;
	int i;

	u8 sbyt = snd_mtpav_getreg(mcrd, SREG);

	//printk("snd_mtpav_read_bytes() sbyt: 0x%x\n", sbyt);

	if (!(sbyt & SIGS_BYTE))
		return;

	cbyt = snd_mtpav_getreg(mcrd, CREG);
	clrread = cbyt & (SIGC_READ ^ 0xff);
	setread = cbyt | SIGC_READ;

	do {

		mtp_read_byte = 0;
		for (i = 0; i < 4; i++) {
			snd_mtpav_mputreg(mcrd, CREG, setread);
			sr = snd_mtpav_getreg(mcrd, SREG);
			snd_mtpav_mputreg(mcrd, CREG, clrread);

			sr &= SIGS_IN0 | SIGS_IN1;
			sr >>= 4;
			mtp_read_byte |= sr << (i * 2);
		}

		snd_mtpav_inmidi_h(mcrd, mtp_read_byte);

		sbyt = snd_mtpav_getreg(mcrd, SREG);

	} while (sbyt & SIGS_BYTE);
}

static irqreturn_t snd_mtpav_irqh(int irq, void *dev_id)
{
	struct mtpav *mcard = dev_id;

	spin_lock(&mcard->spinlock);
	snd_mtpav_read_bytes(mcard);
	spin_unlock(&mcard->spinlock);
	return IRQ_HANDLED;
}

/*
 * get ISA resources
 */
static int __devinit snd_mtpav_get_ISA(struct mtpav * mcard)
{
	if ((mcard->res_port = request_region(port, 3, "MotuMTPAV MIDI")) == NULL) {
		snd_printk("MTVAP port 0x%lx is busy\n", port);
		return -EBUSY;
	}
	mcard->port = port;
	if (request_irq(irq, snd_mtpav_irqh, IRQF_DISABLED, "MOTU MTPAV", mcard)) {
		snd_printk("MTVAP IRQ %d busy\n", irq);
		return -EBUSY;
	}
	mcard->irq = irq;
	return 0;
}


/*
 */

static struct snd_rawmidi_ops snd_mtpav_output = {
	.open =		snd_mtpav_output_open,
	.close =	snd_mtpav_output_close,
	.trigger =	snd_mtpav_output_trigger,
};

static struct snd_rawmidi_ops snd_mtpav_input = {
	.open =		snd_mtpav_input_open,
	.close =	snd_mtpav_input_close,
	.trigger =	snd_mtpav_input_trigger,
};


/*
 * get RAWMIDI resources
 */

static void __devinit snd_mtpav_set_name(struct mtpav *chip,
				      struct snd_rawmidi_substream *substream)
{
	if (substream->number >= 0 && substream->number < chip->num_ports)
		sprintf(substream->name, "MTP direct %d", (substream->number % chip->num_ports) + 1);
	else if (substream->number >= 8 && substream->number < chip->num_ports * 2)
		sprintf(substream->name, "MTP remote %d", (substream->number % chip->num_ports) + 1);
	else if (substream->number == chip->num_ports * 2)
		strcpy(substream->name, "MTP computer");
	else if (substream->number == chip->num_ports * 2 + 1)
		strcpy(substream->name, "MTP ADAT");
	else
		strcpy(substream->name, "MTP broadcast");
}

static int __devinit snd_mtpav_get_RAWMIDI(struct mtpav *mcard)
{
	int rval;
	struct snd_rawmidi *rawmidi;
	struct snd_rawmidi_substream *substream;
	struct list_head *list;

	if (hwports < 1)
		hwports = 1;
	else if (hwports > 8)
		hwports = 8;
	mcard->num_ports = hwports;

	if ((rval = snd_rawmidi_new(mcard->card, "MotuMIDI", 0,
				    mcard->num_ports * 2 + MTPAV_PIDX_BROADCAST + 1,
				    mcard->num_ports * 2 + MTPAV_PIDX_BROADCAST + 1,
				    &mcard->rmidi)) < 0)
		return rval;
	rawmidi = mcard->rmidi;
	rawmidi->private_data = mcard;

	list_for_each(list, &rawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
		substream = list_entry(list, struct snd_rawmidi_substream, list);
		snd_mtpav_set_name(mcard, substream);
		substream->ops = &snd_mtpav_input;
	}
	list_for_each(list, &rawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
		substream = list_entry(list, struct snd_rawmidi_substream, list);
		snd_mtpav_set_name(mcard, substream);
		substream->ops = &snd_mtpav_output;
		mcard->ports[substream->number].hwport = translate_subdevice_to_hwport(mcard, substream->number);
	}
	rawmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT |
			       SNDRV_RAWMIDI_INFO_DUPLEX;
	sprintf(rawmidi->name, "MTP AV MIDI");
	return 0;
}

/*
 */

static void snd_mtpav_free(struct snd_card *card)
{
	struct mtpav *crd = card->private_data;
	unsigned long flags;

	spin_lock_irqsave(&crd->spinlock, flags);
	if (crd->istimer > 0)
		snd_mtpav_remove_output_timer(crd);
	spin_unlock_irqrestore(&crd->spinlock, flags);
	if (crd->irq >= 0)
		free_irq(crd->irq, (void *)crd);
	release_and_free_resource(crd->res_port);
}

/*
 */
static int __devinit snd_mtpav_probe(struct platform_device *dev)
{
	struct snd_card *card;
	int err;
	struct mtpav *mtp_card;

	card = snd_card_new(index, id, THIS_MODULE, sizeof(*mtp_card));
	if (! card)
		return -ENOMEM;

	mtp_card = card->private_data;
	spin_lock_init(&mtp_card->spinlock);
	init_timer(&mtp_card->timer);
	mtp_card->card = card;
	mtp_card->irq = -1;
	mtp_card->share_irq = 0;
	mtp_card->inmidiport = 0xffffffff;
	mtp_card->inmidistate = 0;
	mtp_card->outmidihwport = 0xffffffff;
	init_timer(&mtp_card->timer);
	mtp_card->timer.function = snd_mtpav_output_timer;
	mtp_card->timer.data = (unsigned long) mtp_card;

	card->private_free = snd_mtpav_free;

	err = snd_mtpav_get_ISA(mtp_card);
	if (err < 0)
		goto __error;

	strcpy(card->driver, "MTPAV");
	strcpy(card->shortname, "MTPAV on parallel port");
	snprintf(card->longname, sizeof(card->longname),
		 "MTPAV on parallel port at 0x%lx", port);

	err = snd_mtpav_get_RAWMIDI(mtp_card);
	if (err < 0)
		goto __error;

	snd_mtpav_portscan(mtp_card);

	snd_card_set_dev(card, &dev->dev);
	err = snd_card_register(mtp_card->card);
	if (err < 0)
		goto __error;

	platform_set_drvdata(dev, card);
	printk(KERN_INFO "Motu MidiTimePiece on parallel port irq: %d ioport: 0x%lx\n", irq, port);
	return 0;

 __error:
	snd_card_free(card);
	return err;
}

static int __devexit snd_mtpav_remove(struct platform_device *devptr)
{
	snd_card_free(platform_get_drvdata(devptr));
	platform_set_drvdata(devptr, NULL);
	return 0;
}

#define SND_MTPAV_DRIVER	"snd_mtpav"

static struct platform_driver snd_mtpav_driver = {
	.probe		= snd_mtpav_probe,
	.remove		= __devexit_p(snd_mtpav_remove),
	.driver		= {
		.name	= SND_MTPAV_DRIVER
	},
};

static int __init alsa_card_mtpav_init(void)
{
	int err;

	if ((err = platform_driver_register(&snd_mtpav_driver)) < 0)
		return err;

	device = platform_device_register_simple(SND_MTPAV_DRIVER, -1, NULL, 0);
	if (!IS_ERR(device)) {
		if (platform_get_drvdata(device))
			return 0;
		platform_device_unregister(device);
		err = -ENODEV;
	} else
		err = PTR_ERR(device);
	platform_driver_unregister(&snd_mtpav_driver);
	return err;
}

static void __exit alsa_card_mtpav_exit(void)
{
	platform_device_unregister(device);
	platform_driver_unregister(&snd_mtpav_driver);
}

module_init(alsa_card_mtpav_init)
module_exit(alsa_card_mtpav_exit)