You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
181 lines
4.9 KiB
181 lines
4.9 KiB
/*
|
|
* 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 <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 *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF;
|
|
|
|
spin_lock_irqsave(&mpu->input_lock, flags);
|
|
while (readw(mpu->dev->MIDQ + JQS_wTail) !=
|
|
readw(mpu->dev->MIDQ + JQS_wHead)) {
|
|
u16 wTmp, val;
|
|
val = readw(pwMIDQData + 2 * readw(mpu->dev->MIDQ + JQS_wHead));
|
|
|
|
if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER,
|
|
&mpu->mode))
|
|
snd_rawmidi_receive(mpu->substream_input,
|
|
(unsigned char *)&val, 1);
|
|
|
|
wTmp = readw(mpu->dev->MIDQ + JQS_wHead) + 1;
|
|
if (wTmp > readw(mpu->dev->MIDQ + JQS_wSize))
|
|
writew(0, mpu->dev->MIDQ + JQS_wHead);
|
|
else
|
|
writew(wTmp, mpu->dev->MIDQ + JQS_wHead);
|
|
}
|
|
spin_unlock_irqrestore(&mpu->input_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(snd_msndmidi_input_read);
|
|
|
|
static 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;
|
|
}
|
|
|