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linux/sound/isa/msnd/msnd_midi.c
Paul Gortmaker d81a6d7176 sound: Add export.h for THIS_MODULE/EXPORT_SYMBOL where needed
These aren't modules, but they do make use of these macros, so
they will need export.h to get that definition.  Previously,
they got it via the implicit module.h inclusion.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:22 -04:00

183 lines
4.9 KiB
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 *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;
}