linux/sound/isa/msnd/msnd_midi.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

168 lines
4.2 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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.
*/
#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;
}