[deliverable/linux.git] / sound / core / seq / seq_midi.c

/*
 *   Generic MIDI synth driver for ALSA sequencer
 *   Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
 *                         Jaroslav Kysela <perex@perex.cz>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */
 
/* 
Possible options for midisynth module:
	- automatic opening of midi ports on first received event or subscription
	  (close will be performed when client leaves)
*/


#include <linux/init.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <sound/core.h>
#include <sound/rawmidi.h>
#include <sound/seq_kernel.h>
#include <sound/seq_device.h>
#include <sound/seq_midi_event.h>
#include <sound/initval.h>

MODULE_AUTHOR("Frank van de Pol <fvdpol@coil.demon.nl>, Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer MIDI synth.");
MODULE_LICENSE("GPL");
static int output_buffer_size = PAGE_SIZE;
module_param(output_buffer_size, int, 0644);
MODULE_PARM_DESC(output_buffer_size, "Output buffer size in bytes.");
static int input_buffer_size = PAGE_SIZE;
module_param(input_buffer_size, int, 0644);
MODULE_PARM_DESC(input_buffer_size, "Input buffer size in bytes.");

/* data for this midi synth driver */
struct seq_midisynth {
	struct snd_card *card;
	int device;
	int subdevice;
	struct snd_rawmidi_file input_rfile;
	struct snd_rawmidi_file output_rfile;
	int seq_client;
	int seq_port;
	struct snd_midi_event *parser;
};

struct seq_midisynth_client {
	int seq_client;
	int num_ports;
	int ports_per_device[SNDRV_RAWMIDI_DEVICES];
 	struct seq_midisynth *ports[SNDRV_RAWMIDI_DEVICES];
};

static struct seq_midisynth_client *synths[SNDRV_CARDS];
static DEFINE_MUTEX(register_mutex);

/* handle rawmidi input event (MIDI v1.0 stream) */
static void snd_midi_input_event(struct snd_rawmidi_substream *substream)
{
	struct snd_rawmidi_runtime *runtime;
	struct seq_midisynth *msynth;
	struct snd_seq_event ev;
	char buf[16], *pbuf;
	long res, count;

	if (substream == NULL)
		return;
	runtime = substream->runtime;
	msynth = runtime->private_data;
	if (msynth == NULL)
		return;
	memset(&ev, 0, sizeof(ev));
	while (runtime->avail > 0) {
		res = snd_rawmidi_kernel_read(substream, buf, sizeof(buf));
		if (res <= 0)
			continue;
		if (msynth->parser == NULL)
			continue;
		pbuf = buf;
		while (res > 0) {
			count = snd_midi_event_encode(msynth->parser, pbuf, res, &ev);
			if (count < 0)
				break;
			pbuf += count;
			res -= count;
			if (ev.type != SNDRV_SEQ_EVENT_NONE) {
				ev.source.port = msynth->seq_port;
				ev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
				snd_seq_kernel_client_dispatch(msynth->seq_client, &ev, 1, 0);
				/* clear event and reset header */
				memset(&ev, 0, sizeof(ev));
			}
		}
	}
}

static int dump_midi(struct snd_rawmidi_substream *substream, const char *buf, int count)
{
	struct snd_rawmidi_runtime *runtime;
	int tmp;

	if (snd_BUG_ON(!substream || !buf))
		return -EINVAL;
	runtime = substream->runtime;
	if ((tmp = runtime->avail) < count) {
		if (printk_ratelimit())
			pr_err("ALSA: seq_midi: MIDI output buffer overrun\n");
		return -ENOMEM;
	}
	if (snd_rawmidi_kernel_write(substream, buf, count) < count)
		return -EINVAL;
	return 0;
}

static int event_process_midi(struct snd_seq_event *ev, int direct,
			      void *private_data, int atomic, int hop)
{
	struct seq_midisynth *msynth = private_data;
	unsigned char msg[10];	/* buffer for constructing midi messages */
	struct snd_rawmidi_substream *substream;
	int len;

	if (snd_BUG_ON(!msynth))
		return -EINVAL;
	substream = msynth->output_rfile.output;
	if (substream == NULL)
		return -ENODEV;
	if (ev->type == SNDRV_SEQ_EVENT_SYSEX) {	/* special case, to save space */
		if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE) {
			/* invalid event */
			pr_debug("ALSA: seq_midi: invalid sysex event flags = 0x%x\n", ev->flags);
			return 0;
		}
		snd_seq_dump_var_event(ev, (snd_seq_dump_func_t)dump_midi, substream);
		snd_midi_event_reset_decode(msynth->parser);
	} else {
		if (msynth->parser == NULL)
			return -EIO;
		len = snd_midi_event_decode(msynth->parser, msg, sizeof(msg), ev);
		if (len < 0)
			return 0;
		if (dump_midi(substream, msg, len) < 0)
			snd_midi_event_reset_decode(msynth->parser);
	}
	return 0;
}


static int snd_seq_midisynth_new(struct seq_midisynth *msynth,
				 struct snd_card *card,
				 int device,
				 int subdevice)
{
	if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &msynth->parser) < 0)
		return -ENOMEM;
	msynth->card = card;
	msynth->device = device;
	msynth->subdevice = subdevice;
	return 0;
}

/* open associated midi device for input */
static int midisynth_subscribe(void *private_data, struct snd_seq_port_subscribe *info)
{
	int err;
	struct seq_midisynth *msynth = private_data;
	struct snd_rawmidi_runtime *runtime;
	struct snd_rawmidi_params params;

	/* open midi port */
	if ((err = snd_rawmidi_kernel_open(msynth->card, msynth->device,
					   msynth->subdevice,
					   SNDRV_RAWMIDI_LFLG_INPUT,
					   &msynth->input_rfile)) < 0) {
		pr_debug("ALSA: seq_midi: midi input open failed!!!\n");
		return err;
	}
	runtime = msynth->input_rfile.input->runtime;
	memset(&params, 0, sizeof(params));
	params.avail_min = 1;
	params.buffer_size = input_buffer_size;
	if ((err = snd_rawmidi_input_params(msynth->input_rfile.input, &params)) < 0) {
		snd_rawmidi_kernel_release(&msynth->input_rfile);
		return err;
	}
	snd_midi_event_reset_encode(msynth->parser);
	runtime->event = snd_midi_input_event;
	runtime->private_data = msynth;
	snd_rawmidi_kernel_read(msynth->input_rfile.input, NULL, 0);
	return 0;
}

/* close associated midi device for input */
static int midisynth_unsubscribe(void *private_data, struct snd_seq_port_subscribe *info)
{
	int err;
	struct seq_midisynth *msynth = private_data;

	if (snd_BUG_ON(!msynth->input_rfile.input))
		return -EINVAL;
	err = snd_rawmidi_kernel_release(&msynth->input_rfile);
	return err;
}

/* open associated midi device for output */
static int midisynth_use(void *private_data, struct snd_seq_port_subscribe *info)
{
	int err;
	struct seq_midisynth *msynth = private_data;
	struct snd_rawmidi_params params;

	/* open midi port */
	if ((err = snd_rawmidi_kernel_open(msynth->card, msynth->device,
					   msynth->subdevice,
					   SNDRV_RAWMIDI_LFLG_OUTPUT,
					   &msynth->output_rfile)) < 0) {
		pr_debug("ALSA: seq_midi: midi output open failed!!!\n");
		return err;
	}
	memset(&params, 0, sizeof(params));
	params.avail_min = 1;
	params.buffer_size = output_buffer_size;
	params.no_active_sensing = 1;
	if ((err = snd_rawmidi_output_params(msynth->output_rfile.output, &params)) < 0) {
		snd_rawmidi_kernel_release(&msynth->output_rfile);
		return err;
	}
	snd_midi_event_reset_decode(msynth->parser);
	return 0;
}

/* close associated midi device for output */
static int midisynth_unuse(void *private_data, struct snd_seq_port_subscribe *info)
{
	struct seq_midisynth *msynth = private_data;

	if (snd_BUG_ON(!msynth->output_rfile.output))
		return -EINVAL;
	snd_rawmidi_drain_output(msynth->output_rfile.output);
	return snd_rawmidi_kernel_release(&msynth->output_rfile);
}

/* delete given midi synth port */
static void snd_seq_midisynth_delete(struct seq_midisynth *msynth)
{
	if (msynth == NULL)
		return;

	if (msynth->seq_client > 0) {
		/* delete port */
		snd_seq_event_port_detach(msynth->seq_client, msynth->seq_port);
	}

	snd_midi_event_free(msynth->parser);
}

/* register new midi synth port */
static int
snd_seq_midisynth_probe(struct device *_dev)
{
	struct snd_seq_device *dev = to_seq_dev(_dev);
	struct seq_midisynth_client *client;
	struct seq_midisynth *msynth, *ms;
	struct snd_seq_port_info *port;
	struct snd_rawmidi_info *info;
	struct snd_rawmidi *rmidi = dev->private_data;
	int newclient = 0;
	unsigned int p, ports;
	struct snd_seq_port_callback pcallbacks;
	struct snd_card *card = dev->card;
	int device = dev->device;
	unsigned int input_count = 0, output_count = 0;

	if (snd_BUG_ON(!card || device < 0 || device >= SNDRV_RAWMIDI_DEVICES))
		return -EINVAL;
	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (! info)
		return -ENOMEM;
	info->device = device;
	info->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
	info->subdevice = 0;
	if (snd_rawmidi_info_select(card, info) >= 0)
		output_count = info->subdevices_count;
	info->stream = SNDRV_RAWMIDI_STREAM_INPUT;
	if (snd_rawmidi_info_select(card, info) >= 0) {
		input_count = info->subdevices_count;
	}
	ports = output_count;
	if (ports < input_count)
		ports = input_count;
	if (ports == 0) {
		kfree(info);
		return -ENODEV;
	}
	if (ports > (256 / SNDRV_RAWMIDI_DEVICES))
		ports = 256 / SNDRV_RAWMIDI_DEVICES;

	mutex_lock(&register_mutex);
	client = synths[card->number];
	if (client == NULL) {
		newclient = 1;
		client = kzalloc(sizeof(*client), GFP_KERNEL);
		if (client == NULL) {
			mutex_unlock(&register_mutex);
			kfree(info);
			return -ENOMEM;
		}
		client->seq_client =
			snd_seq_create_kernel_client(
				card, 0, "%s", card->shortname[0] ?
				(const char *)card->shortname : "External MIDI");
		if (client->seq_client < 0) {
			kfree(client);
			mutex_unlock(&register_mutex);
			kfree(info);
			return -ENOMEM;
		}
	}

	msynth = kcalloc(ports, sizeof(struct seq_midisynth), GFP_KERNEL);
	port = kmalloc(sizeof(*port), GFP_KERNEL);
	if (msynth == NULL || port == NULL)
		goto __nomem;

	for (p = 0; p < ports; p++) {
		ms = &msynth[p];

		if (snd_seq_midisynth_new(ms, card, device, p) < 0)
			goto __nomem;

		/* declare port */
		memset(port, 0, sizeof(*port));
		port->addr.client = client->seq_client;
		port->addr.port = device * (256 / SNDRV_RAWMIDI_DEVICES) + p;
		port->flags = SNDRV_SEQ_PORT_FLG_GIVEN_PORT;
		memset(info, 0, sizeof(*info));
		info->device = device;
		if (p < output_count)
			info->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
		else
			info->stream = SNDRV_RAWMIDI_STREAM_INPUT;
		info->subdevice = p;
		if (snd_rawmidi_info_select(card, info) >= 0)
			strcpy(port->name, info->subname);
		if (! port->name[0]) {
			if (info->name[0]) {
				if (ports > 1)
					snprintf(port->name, sizeof(port->name), "%s-%u", info->name, p);
				else
					snprintf(port->name, sizeof(port->name), "%s", info->name);
			} else {
				/* last resort */
				if (ports > 1)
					sprintf(port->name, "MIDI %d-%d-%u", card->number, device, p);
				else
					sprintf(port->name, "MIDI %d-%d", card->number, device);
			}
		}
		if ((info->flags & SNDRV_RAWMIDI_INFO_OUTPUT) && p < output_count)
			port->capability |= SNDRV_SEQ_PORT_CAP_WRITE | SNDRV_SEQ_PORT_CAP_SYNC_WRITE | SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
		if ((info->flags & SNDRV_RAWMIDI_INFO_INPUT) && p < input_count)
			port->capability |= SNDRV_SEQ_PORT_CAP_READ | SNDRV_SEQ_PORT_CAP_SYNC_READ | SNDRV_SEQ_PORT_CAP_SUBS_READ;
		if ((port->capability & (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_READ)) == (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_READ) &&
		    info->flags & SNDRV_RAWMIDI_INFO_DUPLEX)
			port->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
		port->type = SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC
			| SNDRV_SEQ_PORT_TYPE_HARDWARE
			| SNDRV_SEQ_PORT_TYPE_PORT;
		port->midi_channels = 16;
		memset(&pcallbacks, 0, sizeof(pcallbacks));
		pcallbacks.owner = THIS_MODULE;
		pcallbacks.private_data = ms;
		pcallbacks.subscribe = midisynth_subscribe;
		pcallbacks.unsubscribe = midisynth_unsubscribe;
		pcallbacks.use = midisynth_use;
		pcallbacks.unuse = midisynth_unuse;
		pcallbacks.event_input = event_process_midi;
		port->kernel = &pcallbacks;
		if (rmidi->ops && rmidi->ops->get_port_info)
			rmidi->ops->get_port_info(rmidi, p, port);
		if (snd_seq_kernel_client_ctl(client->seq_client, SNDRV_SEQ_IOCTL_CREATE_PORT, port)<0)
			goto __nomem;
		ms->seq_client = client->seq_client;
		ms->seq_port = port->addr.port;
	}
	client->ports_per_device[device] = ports;
	client->ports[device] = msynth;
	client->num_ports++;
	if (newclient)
		synths[card->number] = client;
	mutex_unlock(&register_mutex);
	kfree(info);
	kfree(port);
	return 0;	/* success */

      __nomem:
	if (msynth != NULL) {
	      	for (p = 0; p < ports; p++)
	      		snd_seq_midisynth_delete(&msynth[p]);
		kfree(msynth);
	}
	if (newclient) {
		snd_seq_delete_kernel_client(client->seq_client);
		kfree(client);
	}
	kfree(info);
	kfree(port);
	mutex_unlock(&register_mutex);
	return -ENOMEM;
}

/* release midi synth port */
static int
snd_seq_midisynth_remove(struct device *_dev)
{
	struct snd_seq_device *dev = to_seq_dev(_dev);
	struct seq_midisynth_client *client;
	struct seq_midisynth *msynth;
	struct snd_card *card = dev->card;
	int device = dev->device, p, ports;
	
	mutex_lock(&register_mutex);
	client = synths[card->number];
	if (client == NULL || client->ports[device] == NULL) {
		mutex_unlock(&register_mutex);
		return -ENODEV;
	}
	ports = client->ports_per_device[device];
	client->ports_per_device[device] = 0;
	msynth = client->ports[device];
	client->ports[device] = NULL;
	for (p = 0; p < ports; p++)
		snd_seq_midisynth_delete(&msynth[p]);
	kfree(msynth);
	client->num_ports--;
	if (client->num_ports <= 0) {
		snd_seq_delete_kernel_client(client->seq_client);
		synths[card->number] = NULL;
		kfree(client);
	}
	mutex_unlock(&register_mutex);
	return 0;
}

static struct snd_seq_driver seq_midisynth_driver = {
	.driver = {
		.name = KBUILD_MODNAME,
		.probe = snd_seq_midisynth_probe,
		.remove = snd_seq_midisynth_remove,
	},
	.id = SNDRV_SEQ_DEV_ID_MIDISYNTH,
	.argsize = 0,
};

module_snd_seq_driver(seq_midisynth_driver);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Generic MIDI synth driver for ALSA sequencer
	3	* Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
c1017a4c	4	* Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
	22	/*
	23	Possible options for midisynth module:
	24	- automatic opening of midi ports on first received event or subscription
	25	(close will be performed when client leaves)
	26	*/
	27
	28
1da177e4 LT	29	#include <linux/init.h>
	30	#include <linux/slab.h>
	31	#include <linux/errno.h>
	32	#include <linux/string.h>
65a77217	33	#include <linux/module.h>
1a60d4c5	34	#include <linux/mutex.h>
1da177e4 LT	35	#include <sound/core.h>
	36	#include <sound/rawmidi.h>
	37	#include <sound/seq_kernel.h>
	38	#include <sound/seq_device.h>
	39	#include <sound/seq_midi_event.h>
	40	#include <sound/initval.h>
	41
c1017a4c	42	MODULE_AUTHOR("Frank van de Pol <fvdpol@coil.demon.nl>, Jaroslav Kysela <perex@perex.cz>");
1da177e4 LT	43	MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer MIDI synth.");
	44	MODULE_LICENSE("GPL");
	45	static int output_buffer_size = PAGE_SIZE;
	46	module_param(output_buffer_size, int, 0644);
	47	MODULE_PARM_DESC(output_buffer_size, "Output buffer size in bytes.");
	48	static int input_buffer_size = PAGE_SIZE;
	49	module_param(input_buffer_size, int, 0644);
	50	MODULE_PARM_DESC(input_buffer_size, "Input buffer size in bytes.");
	51
	52	/* data for this midi synth driver */
c7e0b5bf TI	53	struct seq_midisynth {
c7e0b5bf TI	54	struct snd_card *card;
1da177e4 LT	55	int device;
1da177e4 LT	56	int subdevice;
c7e0b5bf TI	57	struct snd_rawmidi_file input_rfile;
c7e0b5bf TI	58	struct snd_rawmidi_file output_rfile;
1da177e4 LT	59	int seq_client;
1da177e4 LT	60	int seq_port;
c7e0b5bf TI	61	struct snd_midi_event *parser;
c7e0b5bf TI	62	};
1da177e4	63
c7e0b5bf	64	struct seq_midisynth_client {
1da177e4 LT	65	int seq_client;
	66	int num_ports;
	67	int ports_per_device[SNDRV_RAWMIDI_DEVICES];
c7e0b5bf TI	68	struct seq_midisynth *ports[SNDRV_RAWMIDI_DEVICES];
c7e0b5bf TI	69	};
1da177e4	70
c7e0b5bf	71	static struct seq_midisynth_client *synths[SNDRV_CARDS];
1a60d4c5	72	static DEFINE_MUTEX(register_mutex);
1da177e4 LT	73
1da177e4 LT	74	/* handle rawmidi input event (MIDI v1.0 stream) */
c7e0b5bf	75	static void snd_midi_input_event(struct snd_rawmidi_substream *substream)
1da177e4	76	{
c7e0b5bf TI	77	struct snd_rawmidi_runtime *runtime;
	78	struct seq_midisynth *msynth;
	79	struct snd_seq_event ev;
1da177e4 LT	80	char buf[16], *pbuf;
	81	long res, count;
	82
	83	if (substream == NULL)
	84	return;
	85	runtime = substream->runtime;
c7e0b5bf	86	msynth = runtime->private_data;
1da177e4 LT	87	if (msynth == NULL)
	88	return;
	89	memset(&ev, 0, sizeof(ev));
	90	while (runtime->avail > 0) {
	91	res = snd_rawmidi_kernel_read(substream, buf, sizeof(buf));
	92	if (res <= 0)
	93	continue;
	94	if (msynth->parser == NULL)
	95	continue;
	96	pbuf = buf;
	97	while (res > 0) {
	98	count = snd_midi_event_encode(msynth->parser, pbuf, res, &ev);
	99	if (count < 0)
	100	break;
	101	pbuf += count;
	102	res -= count;
	103	if (ev.type != SNDRV_SEQ_EVENT_NONE) {
	104	ev.source.port = msynth->seq_port;
	105	ev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
	106	snd_seq_kernel_client_dispatch(msynth->seq_client, &ev, 1, 0);
	107	/* clear event and reset header */
	108	memset(&ev, 0, sizeof(ev));
	109	}
	110	}
	111	}
	112	}
	113
c7e0b5bf	114	static int dump_midi(struct snd_rawmidi_substream substream, const char buf, int count)
1da177e4	115	{
c7e0b5bf	116	struct snd_rawmidi_runtime *runtime;
1da177e4 LT	117	int tmp;
1da177e4 LT	118
7eaa943c TI	119	if (snd_BUG_ON(!substream \|\| !buf))
7eaa943c TI	120	return -EINVAL;
1da177e4 LT	121	runtime = substream->runtime;
1da177e4 LT	122	if ((tmp = runtime->avail) < count) {
f907ed94	123	if (printk_ratelimit())
04cc79a0	124	pr_err("ALSA: seq_midi: MIDI output buffer overrun\n");
1da177e4 LT	125	return -ENOMEM;
	126	}
	127	if (snd_rawmidi_kernel_write(substream, buf, count) < count)
	128	return -EINVAL;
	129	return 0;
	130	}
	131
c7e0b5bf	132	static int event_process_midi(struct snd_seq_event *ev, int direct,
1da177e4 LT	133	void *private_data, int atomic, int hop)
1da177e4 LT	134	{
c7e0b5bf	135	struct seq_midisynth *msynth = private_data;
1da177e4	136	unsigned char msg[10]; /* buffer for constructing midi messages */
c7e0b5bf	137	struct snd_rawmidi_substream *substream;
d06e4c40	138	int len;
1da177e4	139
7eaa943c TI	140	if (snd_BUG_ON(!msynth))
7eaa943c TI	141	return -EINVAL;
1da177e4 LT	142	substream = msynth->output_rfile.output;
	143	if (substream == NULL)
	144	return -ENODEV;
	145	if (ev->type == SNDRV_SEQ_EVENT_SYSEX) { /* special case, to save space */
	146	if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE) {
	147	/* invalid event */
04cc79a0	148	pr_debug("ALSA: seq_midi: invalid sysex event flags = 0x%x\n", ev->flags);
1da177e4 LT	149	return 0;
1da177e4 LT	150	}
d06e4c40	151	snd_seq_dump_var_event(ev, (snd_seq_dump_func_t)dump_midi, substream);
1da177e4	152	snd_midi_event_reset_decode(msynth->parser);
1da177e4 LT	153	} else {
	154	if (msynth->parser == NULL)
	155	return -EIO;
d06e4c40 CL	156	len = snd_midi_event_decode(msynth->parser, msg, sizeof(msg), ev);
	157	if (len < 0)
	158	return 0;
	159	if (dump_midi(substream, msg, len) < 0)
1da177e4	160	snd_midi_event_reset_decode(msynth->parser);
1da177e4 LT	161	}
	162	return 0;
	163	}
	164
	165
c7e0b5bf TI	166	static int snd_seq_midisynth_new(struct seq_midisynth *msynth,
c7e0b5bf TI	167	struct snd_card *card,
1da177e4 LT	168	int device,
	169	int subdevice)
	170	{
	171	if (snd_midi_event_new(MAX_MIDI_EVENT_BUF, &msynth->parser) < 0)
	172	return -ENOMEM;
	173	msynth->card = card;
	174	msynth->device = device;
	175	msynth->subdevice = subdevice;
	176	return 0;
	177	}
	178
	179	/* open associated midi device for input */
c7e0b5bf	180	static int midisynth_subscribe(void private_data, struct snd_seq_port_subscribe info)
1da177e4 LT	181	{
1da177e4 LT	182	int err;
c7e0b5bf TI	183	struct seq_midisynth *msynth = private_data;
	184	struct snd_rawmidi_runtime *runtime;
	185	struct snd_rawmidi_params params;
1da177e4 LT	186
1da177e4 LT	187	/* open midi port */
f87135f5 CL	188	if ((err = snd_rawmidi_kernel_open(msynth->card, msynth->device,
	189	msynth->subdevice,
	190	SNDRV_RAWMIDI_LFLG_INPUT,
	191	&msynth->input_rfile)) < 0) {
04cc79a0	192	pr_debug("ALSA: seq_midi: midi input open failed!!!\n");
1da177e4 LT	193	return err;
	194	}
	195	runtime = msynth->input_rfile.input->runtime;
	196	memset(&params, 0, sizeof(params));
	197	params.avail_min = 1;
	198	params.buffer_size = input_buffer_size;
	199	if ((err = snd_rawmidi_input_params(msynth->input_rfile.input, &params)) < 0) {
	200	snd_rawmidi_kernel_release(&msynth->input_rfile);
	201	return err;
	202	}
	203	snd_midi_event_reset_encode(msynth->parser);
	204	runtime->event = snd_midi_input_event;
	205	runtime->private_data = msynth;
	206	snd_rawmidi_kernel_read(msynth->input_rfile.input, NULL, 0);
	207	return 0;
	208	}
	209
	210	/* close associated midi device for input */
c7e0b5bf	211	static int midisynth_unsubscribe(void private_data, struct snd_seq_port_subscribe info)
1da177e4 LT	212	{
1da177e4 LT	213	int err;
c7e0b5bf	214	struct seq_midisynth *msynth = private_data;
1da177e4	215
7eaa943c TI	216	if (snd_BUG_ON(!msynth->input_rfile.input))
7eaa943c TI	217	return -EINVAL;
1da177e4 LT	218	err = snd_rawmidi_kernel_release(&msynth->input_rfile);
	219	return err;
	220	}
	221
	222	/* open associated midi device for output */
c7e0b5bf	223	static int midisynth_use(void private_data, struct snd_seq_port_subscribe info)
1da177e4 LT	224	{
1da177e4 LT	225	int err;
c7e0b5bf TI	226	struct seq_midisynth *msynth = private_data;
c7e0b5bf TI	227	struct snd_rawmidi_params params;
1da177e4 LT	228
1da177e4 LT	229	/* open midi port */
f87135f5 CL	230	if ((err = snd_rawmidi_kernel_open(msynth->card, msynth->device,
	231	msynth->subdevice,
	232	SNDRV_RAWMIDI_LFLG_OUTPUT,
	233	&msynth->output_rfile)) < 0) {
04cc79a0	234	pr_debug("ALSA: seq_midi: midi output open failed!!!\n");
1da177e4 LT	235	return err;
	236	}
	237	memset(&params, 0, sizeof(params));
	238	params.avail_min = 1;
	239	params.buffer_size = output_buffer_size;
2d4b8420	240	params.no_active_sensing = 1;
1da177e4 LT	241	if ((err = snd_rawmidi_output_params(msynth->output_rfile.output, &params)) < 0) {
	242	snd_rawmidi_kernel_release(&msynth->output_rfile);
	243	return err;
	244	}
	245	snd_midi_event_reset_decode(msynth->parser);
	246	return 0;
	247	}
	248
	249	/* close associated midi device for output */
c7e0b5bf	250	static int midisynth_unuse(void private_data, struct snd_seq_port_subscribe info)
1da177e4	251	{
c7e0b5bf	252	struct seq_midisynth *msynth = private_data;
1da177e4	253
7eaa943c TI	254	if (snd_BUG_ON(!msynth->output_rfile.output))
7eaa943c TI	255	return -EINVAL;
1da177e4 LT	256	snd_rawmidi_drain_output(msynth->output_rfile.output);
	257	return snd_rawmidi_kernel_release(&msynth->output_rfile);
	258	}
	259
	260	/* delete given midi synth port */
c7e0b5bf	261	static void snd_seq_midisynth_delete(struct seq_midisynth *msynth)
1da177e4 LT	262	{
	263	if (msynth == NULL)
	264	return;
	265
	266	if (msynth->seq_client > 0) {
	267	/* delete port */
	268	snd_seq_event_port_detach(msynth->seq_client, msynth->seq_port);
	269	}
	270
57dca36e	271	snd_midi_event_free(msynth->parser);
1da177e4 LT	272	}
1da177e4 LT	273
1da177e4 LT	274	/* register new midi synth port */
1da177e4 LT	275	static int
05662205	276	snd_seq_midisynth_probe(struct device *_dev)
1da177e4	277	{
05662205	278	struct snd_seq_device *dev = to_seq_dev(_dev);
c7e0b5bf TI	279	struct seq_midisynth_client *client;
	280	struct seq_midisynth msynth, ms;
	281	struct snd_seq_port_info *port;
	282	struct snd_rawmidi_info *info;
a7b928ac	283	struct snd_rawmidi *rmidi = dev->private_data;
1da177e4 LT	284	int newclient = 0;
1da177e4 LT	285	unsigned int p, ports;
c7e0b5bf TI	286	struct snd_seq_port_callback pcallbacks;
c7e0b5bf TI	287	struct snd_card *card = dev->card;
1da177e4 LT	288	int device = dev->device;
	289	unsigned int input_count = 0, output_count = 0;
	290
7eaa943c TI	291	if (snd_BUG_ON(!card \|\| device < 0 \|\| device >= SNDRV_RAWMIDI_DEVICES))
7eaa943c TI	292	return -EINVAL;
1da177e4 LT	293	info = kmalloc(sizeof(*info), GFP_KERNEL);
	294	if (! info)
	295	return -ENOMEM;
	296	info->device = device;
	297	info->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
	298	info->subdevice = 0;
	299	if (snd_rawmidi_info_select(card, info) >= 0)
	300	output_count = info->subdevices_count;
	301	info->stream = SNDRV_RAWMIDI_STREAM_INPUT;
	302	if (snd_rawmidi_info_select(card, info) >= 0) {
	303	input_count = info->subdevices_count;
	304	}
	305	ports = output_count;
	306	if (ports < input_count)
	307	ports = input_count;
	308	if (ports == 0) {
	309	kfree(info);
	310	return -ENODEV;
	311	}
	312	if (ports > (256 / SNDRV_RAWMIDI_DEVICES))
	313	ports = 256 / SNDRV_RAWMIDI_DEVICES;
	314
1a60d4c5	315	mutex_lock(&register_mutex);
1da177e4 LT	316	client = synths[card->number];
	317	if (client == NULL) {
	318	newclient = 1;
ecca82b4	319	client = kzalloc(sizeof(*client), GFP_KERNEL);
1da177e4	320	if (client == NULL) {
1a60d4c5	321	mutex_unlock(&register_mutex);
1da177e4 LT	322	kfree(info);
	323	return -ENOMEM;
	324	}
7b6d9245 CL	325	client->seq_client =
7b6d9245 CL	326	snd_seq_create_kernel_client(
78fc030b AH	327	card, 0, "%s", card->shortname[0] ?
78fc030b AH	328	(const char *)card->shortname : "External MIDI");
1da177e4 LT	329	if (client->seq_client < 0) {
1da177e4 LT	330	kfree(client);
1a60d4c5	331	mutex_unlock(&register_mutex);
1da177e4 LT	332	kfree(info);
	333	return -ENOMEM;
	334	}
7b6d9245	335	}
1da177e4	336
c7e0b5bf	337	msynth = kcalloc(ports, sizeof(struct seq_midisynth), GFP_KERNEL);
1da177e4 LT	338	port = kmalloc(sizeof(*port), GFP_KERNEL);
	339	if (msynth == NULL \|\| port == NULL)
	340	goto __nomem;
	341
	342	for (p = 0; p < ports; p++) {
	343	ms = &msynth[p];
	344
	345	if (snd_seq_midisynth_new(ms, card, device, p) < 0)
	346	goto __nomem;
	347
	348	/* declare port */
	349	memset(port, 0, sizeof(*port));
	350	port->addr.client = client->seq_client;
	351	port->addr.port = device * (256 / SNDRV_RAWMIDI_DEVICES) + p;
	352	port->flags = SNDRV_SEQ_PORT_FLG_GIVEN_PORT;
	353	memset(info, 0, sizeof(*info));
	354	info->device = device;
	355	if (p < output_count)
	356	info->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
	357	else
	358	info->stream = SNDRV_RAWMIDI_STREAM_INPUT;
	359	info->subdevice = p;
	360	if (snd_rawmidi_info_select(card, info) >= 0)
	361	strcpy(port->name, info->subname);
	362	if (! port->name[0]) {
	363	if (info->name[0]) {
	364	if (ports > 1)
53403a80	365	snprintf(port->name, sizeof(port->name), "%s-%u", info->name, p);
1da177e4 LT	366	else
	367	snprintf(port->name, sizeof(port->name), "%s", info->name);
	368	} else {
	369	/* last resort */
	370	if (ports > 1)
53403a80	371	sprintf(port->name, "MIDI %d-%d-%u", card->number, device, p);
1da177e4 LT	372	else
	373	sprintf(port->name, "MIDI %d-%d", card->number, device);
	374	}
	375	}
	376	if ((info->flags & SNDRV_RAWMIDI_INFO_OUTPUT) && p < output_count)
	377	port->capability \|= SNDRV_SEQ_PORT_CAP_WRITE \| SNDRV_SEQ_PORT_CAP_SYNC_WRITE \| SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
	378	if ((info->flags & SNDRV_RAWMIDI_INFO_INPUT) && p < input_count)
	379	port->capability \|= SNDRV_SEQ_PORT_CAP_READ \| SNDRV_SEQ_PORT_CAP_SYNC_READ \| SNDRV_SEQ_PORT_CAP_SUBS_READ;
	380	if ((port->capability & (SNDRV_SEQ_PORT_CAP_WRITE\|SNDRV_SEQ_PORT_CAP_READ)) == (SNDRV_SEQ_PORT_CAP_WRITE\|SNDRV_SEQ_PORT_CAP_READ) &&
	381	info->flags & SNDRV_RAWMIDI_INFO_DUPLEX)
	382	port->capability \|= SNDRV_SEQ_PORT_CAP_DUPLEX;
450047a7 CL	383	port->type = SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC
	384	\| SNDRV_SEQ_PORT_TYPE_HARDWARE
	385	\| SNDRV_SEQ_PORT_TYPE_PORT;
1da177e4 LT	386	port->midi_channels = 16;
	387	memset(&pcallbacks, 0, sizeof(pcallbacks));
	388	pcallbacks.owner = THIS_MODULE;
	389	pcallbacks.private_data = ms;
	390	pcallbacks.subscribe = midisynth_subscribe;
	391	pcallbacks.unsubscribe = midisynth_unsubscribe;
	392	pcallbacks.use = midisynth_use;
	393	pcallbacks.unuse = midisynth_unuse;
	394	pcallbacks.event_input = event_process_midi;
	395	port->kernel = &pcallbacks;
a7b928ac CL	396	if (rmidi->ops && rmidi->ops->get_port_info)
a7b928ac CL	397	rmidi->ops->get_port_info(rmidi, p, port);
1da177e4 LT	398	if (snd_seq_kernel_client_ctl(client->seq_client, SNDRV_SEQ_IOCTL_CREATE_PORT, port)<0)
	399	goto __nomem;
	400	ms->seq_client = client->seq_client;
	401	ms->seq_port = port->addr.port;
	402	}
	403	client->ports_per_device[device] = ports;
	404	client->ports[device] = msynth;
	405	client->num_ports++;
	406	if (newclient)
	407	synths[card->number] = client;
1a60d4c5	408	mutex_unlock(&register_mutex);
51f633da TI	409	kfree(info);
51f633da TI	410	kfree(port);
1da177e4 LT	411	return 0; /* success */
	412
	413	__nomem:
	414	if (msynth != NULL) {
	415	for (p = 0; p < ports; p++)
	416	snd_seq_midisynth_delete(&msynth[p]);
	417	kfree(msynth);
	418	}
	419	if (newclient) {
	420	snd_seq_delete_kernel_client(client->seq_client);
	421	kfree(client);
	422	}
	423	kfree(info);
	424	kfree(port);
1a60d4c5	425	mutex_unlock(&register_mutex);
1da177e4 LT	426	return -ENOMEM;
	427	}
	428
	429	/* release midi synth port */
	430	static int
05662205	431	snd_seq_midisynth_remove(struct device *_dev)
1da177e4	432	{
05662205	433	struct snd_seq_device *dev = to_seq_dev(_dev);
c7e0b5bf TI	434	struct seq_midisynth_client *client;
	435	struct seq_midisynth *msynth;
	436	struct snd_card *card = dev->card;
1da177e4 LT	437	int device = dev->device, p, ports;
1da177e4 LT	438
1a60d4c5	439	mutex_lock(&register_mutex);
1da177e4 LT	440	client = synths[card->number];
1da177e4 LT	441	if (client == NULL \|\| client->ports[device] == NULL) {
1a60d4c5	442	mutex_unlock(&register_mutex);
1da177e4 LT	443	return -ENODEV;
	444	}
	445	ports = client->ports_per_device[device];
	446	client->ports_per_device[device] = 0;
	447	msynth = client->ports[device];
	448	client->ports[device] = NULL;
1da177e4 LT	449	for (p = 0; p < ports; p++)
	450	snd_seq_midisynth_delete(&msynth[p]);
	451	kfree(msynth);
1da177e4 LT	452	client->num_ports--;
	453	if (client->num_ports <= 0) {
	454	snd_seq_delete_kernel_client(client->seq_client);
	455	synths[card->number] = NULL;
	456	kfree(client);
	457	}
1a60d4c5	458	mutex_unlock(&register_mutex);
1da177e4 LT	459	return 0;
	460	}
	461
05662205 TI	462	static struct snd_seq_driver seq_midisynth_driver = {
	463	.driver = {
	464	.name = KBUILD_MODNAME,
	465	.probe = snd_seq_midisynth_probe,
	466	.remove = snd_seq_midisynth_remove,
	467	},
	468	.id = SNDRV_SEQ_DEV_ID_MIDISYNTH,
	469	.argsize = 0,
	470	};
1da177e4	471
54a721ab	472	module_snd_seq_driver(seq_midisynth_driver);