aboutsummaryrefslogtreecommitdiff
path: root/sound/isa/msnd/msnd_midi.c
blob: 42876b0cb68b42e5dd578edbc4ec9c5ee312092b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Copyright (c) 2009 by Krzysztof Helt
 *  Routines for control of MPU-401 in UART mode
 *
 *  MPU-401 supports UART mode which is not capable generate transmit
 *  interrupts thus output is done via polling. Also, if irq < 0, then
 *  input is done also via polling. Do not expect good performance.
 *
 *
 *   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
 *
 */

#include <linux/io.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/rawmidi.h>

#include "msnd.h"

#define MSNDMIDI_MODE_BIT_INPUT		0
#define MSNDMIDI_MODE_BIT_OUTPUT		1
#define MSNDMIDI_MODE_BIT_INPUT_TRIGGER	2
#define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER	3

struct snd_msndmidi {
	struct snd_msnd *dev;

	unsigned long mode;		/* MSNDMIDI_MODE_XXXX */

	struct snd_rawmidi_substream *substream_input;

	spinlock_t input_lock;
};

/*
 * input/output open/close - protected by open_mutex in rawmidi.c
 */
static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream)
{
	struct snd_msndmidi *mpu;

	snd_printdd("snd_msndmidi_input_open()\n");

	mpu = substream->rmidi->private_data;

	mpu->substream_input = substream;

	snd_msnd_enable_irq(mpu->dev);

	snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START);
	set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
	return 0;
}

static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream)
{
	struct snd_msndmidi *mpu;

	mpu = substream->rmidi->private_data;
	snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP);
	clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
	mpu->substream_input = NULL;
	snd_msnd_disable_irq(mpu->dev);
	return 0;
}

static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu)
{
	u16 tail;

	tail = readw(mpu->dev->MIDQ + JQS_wTail);
	writew(tail, mpu->dev->MIDQ + JQS_wHead);
}

/*
 * trigger input
 */
static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream,
					int up)
{
	unsigned long flags;
	struct snd_msndmidi *mpu;

	snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up);

	mpu = substream->rmidi->private_data;
	spin_lock_irqsave(&mpu->input_lock, flags);
	if (up) {
		if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
				      &mpu->mode))
			snd_msndmidi_input_drop(mpu);
	} else {
		clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
	}
	spin_unlock_irqrestore(&mpu->input_lock, flags);
	if (up)
		snd_msndmidi_input_read(mpu);
}

void snd_msndmidi_input_read(void *mpuv)
{
	unsigned long flags;
	struct snd_msndmidi *mpu = mpuv;
	void __iomem *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
	u16 head, tail, size;

	spin_lock_irqsave(&mpu->input_lock, flags);
	head = readw(mpu->dev->MIDQ + JQS_wHead);
	tail = readw(mpu->dev->MIDQ + JQS_wTail);
	size = readw(mpu->dev->MIDQ + JQS_wSize);
	if (head > size || tail > size)
		goto out;
	while (head != tail) {
		unsigned char val = readw(pwMIDQData + 2 * head);

		if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
			snd_rawmidi_receive(mpu->substream_input, &val, 1);
		if (++head > size)
			head = 0;
		writew(head, mpu->dev->MIDQ + JQS_wHead);
	}
 out:
	spin_unlock_irqrestore(&mpu->input_lock, flags);
}
EXPORT_SYMBOL(snd_msndmidi_input_read);

static const struct snd_rawmidi_ops snd_msndmidi_input = {
	.open =		snd_msndmidi_input_open,
	.close =	snd_msndmidi_input_close,
	.trigger =	snd_msndmidi_input_trigger,
};

static void snd_msndmidi_free(struct snd_rawmidi *rmidi)
{
	struct snd_msndmidi *mpu = rmidi->private_data;
	kfree(mpu);
}

int snd_msndmidi_new(struct snd_card *card, int device)
{
	struct snd_msnd *chip = card->private_data;
	struct snd_msndmidi *mpu;
	struct snd_rawmidi *rmidi;
	int err;

	err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi);
	if (err < 0)
		return err;
	mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
	if (mpu == NULL) {
		snd_device_free(card, rmidi);
		return -ENOMEM;
	}
	mpu->dev = chip;
	chip->msndmidi_mpu = mpu;
	rmidi->private_data = mpu;
	rmidi->private_free = snd_msndmidi_free;
	spin_lock_init(&mpu->input_lock);
	strcpy(rmidi->name, "MSND MIDI");
	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
			    &snd_msndmidi_input);
	rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
	return 0;
}