[linux-2.6-block.git] / sound / isa / msnd / msnd_midi.c

/*
 *  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;
}
Commit	Line	Data
f6c63835 KH	1	/*
	2	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
	3	* Copyright (c) 2009 by Krzysztof Helt
	4	* Routines for control of MPU-401 in UART mode
	5	*
	6	* MPU-401 supports UART mode which is not capable generate transmit
	7	* interrupts thus output is done via polling. Also, if irq < 0, then
	8	* input is done also via polling. Do not expect good performance.
	9	*
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	24	*
	25	*/
	26
	27	#include <linux/io.h>
5a0e3ad6	28	#include <linux/slab.h>
f6c63835 KH	29	#include <linux/delay.h>
	30	#include <linux/ioport.h>
	31	#include <linux/errno.h>
d81a6d71	32	#include <linux/export.h>
f6c63835 KH	33	#include <sound/core.h>
	34	#include <sound/rawmidi.h>
	35
	36	#include "msnd.h"
	37
	38	#define MSNDMIDI_MODE_BIT_INPUT 0
	39	#define MSNDMIDI_MODE_BIT_OUTPUT 1
	40	#define MSNDMIDI_MODE_BIT_INPUT_TRIGGER 2
	41	#define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER 3
	42
	43	struct snd_msndmidi {
	44	struct snd_msnd *dev;
	45
	46	unsigned long mode; /* MSNDMIDI_MODE_XXXX */
	47
	48	struct snd_rawmidi_substream *substream_input;
	49
	50	spinlock_t input_lock;
	51	};
	52
	53	/*
	54	* input/output open/close - protected by open_mutex in rawmidi.c
	55	*/
	56	static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream)
	57	{
	58	struct snd_msndmidi *mpu;
	59
	60	snd_printdd("snd_msndmidi_input_open()\n");
	61
	62	mpu = substream->rmidi->private_data;
	63
	64	mpu->substream_input = substream;
	65
	66	snd_msnd_enable_irq(mpu->dev);
	67
	68	snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START);
	69	set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
	70	return 0;
	71	}
	72
	73	static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream)
	74	{
	75	struct snd_msndmidi *mpu;
	76
	77	mpu = substream->rmidi->private_data;
	78	snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP);
	79	clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode);
	80	mpu->substream_input = NULL;
	81	snd_msnd_disable_irq(mpu->dev);
	82	return 0;
	83	}
	84
	85	static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu)
	86	{
	87	u16 tail;
	88
	89	tail = readw(mpu->dev->MIDQ + JQS_wTail);
	90	writew(tail, mpu->dev->MIDQ + JQS_wHead);
	91	}
	92
	93	/*
	94	* trigger input
	95	*/
	96	static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream,
97	int up)
98	{
99	unsigned long flags;
100	struct snd_msndmidi *mpu;
101
102	snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up);
103
104	mpu = substream->rmidi->private_data;
105	spin_lock_irqsave(&mpu->input_lock, flags);
106	if (up) {
107	if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
108	&mpu->mode))
109	snd_msndmidi_input_drop(mpu);
110	} else {
111	clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
112	}
113	spin_unlock_irqrestore(&mpu->input_lock, flags);
114	if (up)
115	snd_msndmidi_input_read(mpu);
116	}
117
118	void snd_msndmidi_input_read(void *mpuv)
119	{
120	unsigned long flags;
121	struct snd_msndmidi *mpu = mpuv;
ab647a2d	122	void __iomem *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
20e2b791	123	u16 head, tail, size;
f6c63835 KH	124
f6c63835 KH	125	spin_lock_irqsave(&mpu->input_lock, flags);
20e2b791 TI	126	head = readw(mpu->dev->MIDQ + JQS_wHead);
	127	tail = readw(mpu->dev->MIDQ + JQS_wTail);
	128	size = readw(mpu->dev->MIDQ + JQS_wSize);
	129	if (head > size \|\| tail > size)
	130	goto out;
	131	while (head != tail) {
	132	unsigned char val = readw(pwMIDQData + 2 * head);
	133
	134	if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
	135	snd_rawmidi_receive(mpu->substream_input, &val, 1);
	136	if (++head > size)
	137	head = 0;
	138	writew(head, mpu->dev->MIDQ + JQS_wHead);
f6c63835	139	}
20e2b791	140	out:
f6c63835 KH	141	spin_unlock_irqrestore(&mpu->input_lock, flags);
	142	}
	143	EXPORT_SYMBOL(snd_msndmidi_input_read);
	144
9021b2b8	145	static const struct snd_rawmidi_ops snd_msndmidi_input = {
f6c63835 KH	146	.open = snd_msndmidi_input_open,
	147	.close = snd_msndmidi_input_close,
	148	.trigger = snd_msndmidi_input_trigger,
	149	};
	150
	151	static void snd_msndmidi_free(struct snd_rawmidi *rmidi)
	152	{
	153	struct snd_msndmidi *mpu = rmidi->private_data;
	154	kfree(mpu);
	155	}
	156
	157	int snd_msndmidi_new(struct snd_card *card, int device)
	158	{
	159	struct snd_msnd *chip = card->private_data;
	160	struct snd_msndmidi *mpu;
	161	struct snd_rawmidi *rmidi;
	162	int err;
	163
	164	err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi);
	165	if (err < 0)
	166	return err;
ef86f581	167	mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
f6c63835 KH	168	if (mpu == NULL) {
	169	snd_device_free(card, rmidi);
	170	return -ENOMEM;
	171	}
	172	mpu->dev = chip;
	173	chip->msndmidi_mpu = mpu;
	174	rmidi->private_data = mpu;
	175	rmidi->private_free = snd_msndmidi_free;
	176	spin_lock_init(&mpu->input_lock);
	177	strcpy(rmidi->name, "MSND MIDI");
	178	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
	179	&snd_msndmidi_input);
	180	rmidi->info_flags \|= SNDRV_RAWMIDI_INFO_INPUT;
	181	return 0;
	182	}