Release 4.11 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));
			}
		}
	}
}

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Jaroslav Kysela
209
96.31%
1
50.00%
Takashi Iwai
8
3.69%
1
50.00%
Total
217
100.00%
2
100.00%



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;
}

Contributors
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Jaroslav Kysela
72
75.00%
1
20.00%
Takashi Iwai
19
19.79%
3
60.00%
Clemens Ladisch
5
5.21%
1
20.00%
Total
96
100.00%
5
100.00%



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;
}


Contributors
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CommitProp
Jaroslav Kysela
176
88.44%
2
33.33%
Takashi Iwai
18
9.05%
3
50.00%
Clemens Ladisch
5
2.51%
1
16.67%
Total
199
100.00%
6
100.00%



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;
}

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Jaroslav Kysela
57
93.44%
1
50.00%
Takashi Iwai
4
6.56%
1
50.00%
Total
61
100.00%
2
100.00%

/* 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;
}

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Jaroslav Kysela
168
94.38%
2
50.00%
Takashi Iwai
10
5.62%
2
50.00%
Total
178
100.00%
4
100.00%

/* 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;
}

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Jaroslav Kysela
36
66.67%
1
33.33%
Takashi Iwai
18
33.33%
2
66.67%
Total
54
100.00%
3
100.00%

/* 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;
}

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Jaroslav Kysela
130
90.28%
2
40.00%
Takashi Iwai
8
5.56%
2
40.00%
Clemens Ladisch
6
4.17%
1
20.00%
Total
144
100.00%
5
100.00%

/* 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);
}

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38
67.86%
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33.33%
Takashi Iwai
18
32.14%
2
66.67%
Total
56
100.00%
3
100.00%

/* 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);
}

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4.26%
1
33.33%
Total
47
100.00%
3
100.00%

/* 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;
}

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Jaroslav Kysela
905
88.21%
7
38.89%
Takashi Iwai
56
5.46%
5
27.78%
Clemens Ladisch
54
5.26%
3
16.67%
Ingo Molnar
5
0.49%
1
5.56%
Alan Horstmann
4
0.39%
1
5.56%
Masanari Iida
2
0.19%
1
5.56%
Total
1026
100.00%
18
100.00%

/* 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;
}

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Jaroslav Kysela
178
88.56%
2
40.00%
Takashi Iwai
20
9.95%
2
40.00%
Ingo Molnar
3
1.49%
1
20.00%
Total
201
100.00%
5
100.00%


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);
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Jaroslav Kysela
2176
86.97%
14
43.75%
Takashi Iwai
236
9.43%
7
21.88%
Clemens Ladisch
70
2.80%
6
18.75%
Ingo Molnar
10
0.40%
1
3.12%
Alan Horstmann
4
0.16%
1
3.12%
David S. Miller
3
0.12%
1
3.12%
Masanari Iida
2
0.08%
1
3.12%
Paul Gortmaker
1
0.04%
1
3.12%
Total
2502
100.00%
32
100.00%
Directory: sound/core/seq

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