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linux/sound/isa/sb/sb8_midi.c
Takashi Iwai 10dc8ad5ff ALSA: sb: Fix assignment in if condition 
A lot of code for SB drivers is in a legacy style with assignment in
if condition.  This also made harder to catch some bugs (e.g. the
commit 1c98f57440 "ALSA: emu8000: Fix a use after free in
snd_emu8000_create_mixer").

This patch fixes the coding style.  All are rather simple conversions
and there should be no functional changes.
(The changes in snd_emu8000_new() for hw->res_port1, 2 and 3 are
 slightly different from the older ones, but this shouldn't matter
 much in practice.)

Link: https://lore.kernel.org/r/20210608140540.17885-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-06-09 17:29:35 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
* Routines for control of SoundBlaster cards - MIDI interface
*
* --
*
* Sun May 9 22:54:38 BST 1999 George David Morrison <gdm@gedamo.demon.co.uk>
* Fixed typo in snd_sb8dsp_midi_new_device which prevented midi from
* working.
*
* Sun May 11 12:34:56 UTC 2003 Clemens Ladisch <clemens@ladisch.de>
* Added full duplex UART mode for DSP version 2.0 and later.
*/
#include <linux/io.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/sb.h>
irqreturn_t snd_sb8dsp_midi_interrupt(struct snd_sb *chip)
{
struct snd_rawmidi *rmidi;
int max = 64;
char byte;
if (!chip)
return IRQ_NONE;
rmidi = chip->rmidi;
if (!rmidi) {
inb(SBP(chip, DATA_AVAIL)); /* ack interrupt */
return IRQ_NONE;
}
spin_lock(&chip->midi_input_lock);
while (max-- > 0) {
if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
byte = inb(SBP(chip, READ));
if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
snd_rawmidi_receive(chip->midi_substream_input, &byte, 1);
}
}
}
spin_unlock(&chip->midi_input_lock);
return IRQ_HANDLED;
}
static int snd_sb8dsp_midi_input_open(struct snd_rawmidi_substream *substream)
{
unsigned long flags;
struct snd_sb *chip;
unsigned int valid_open_flags;
chip = substream->rmidi->private_data;
valid_open_flags = chip->hardware >= SB_HW_20
? SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER : 0;
spin_lock_irqsave(&chip->open_lock, flags);
if (chip->open & ~valid_open_flags) {
spin_unlock_irqrestore(&chip->open_lock, flags);
return -EAGAIN;
}
chip->open |= SB_OPEN_MIDI_INPUT;
chip->midi_substream_input = substream;
if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
spin_unlock_irqrestore(&chip->open_lock, flags);
snd_sbdsp_reset(chip); /* reset DSP */
if (chip->hardware >= SB_HW_20)
snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
} else {
spin_unlock_irqrestore(&chip->open_lock, flags);
}
return 0;
}
static int snd_sb8dsp_midi_output_open(struct snd_rawmidi_substream *substream)
{
unsigned long flags;
struct snd_sb *chip;
unsigned int valid_open_flags;
chip = substream->rmidi->private_data;
valid_open_flags = chip->hardware >= SB_HW_20
? SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER : 0;
spin_lock_irqsave(&chip->open_lock, flags);
if (chip->open & ~valid_open_flags) {
spin_unlock_irqrestore(&chip->open_lock, flags);
return -EAGAIN;
}
chip->open |= SB_OPEN_MIDI_OUTPUT;
chip->midi_substream_output = substream;
if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
spin_unlock_irqrestore(&chip->open_lock, flags);
snd_sbdsp_reset(chip); /* reset DSP */
if (chip->hardware >= SB_HW_20)
snd_sbdsp_command(chip, SB_DSP_MIDI_UART_IRQ);
} else {
spin_unlock_irqrestore(&chip->open_lock, flags);
}
return 0;
}
static int snd_sb8dsp_midi_input_close(struct snd_rawmidi_substream *substream)
{
unsigned long flags;
struct snd_sb *chip;
chip = substream->rmidi->private_data;
spin_lock_irqsave(&chip->open_lock, flags);
chip->open &= ~(SB_OPEN_MIDI_INPUT | SB_OPEN_MIDI_INPUT_TRIGGER);
chip->midi_substream_input = NULL;
if (!(chip->open & SB_OPEN_MIDI_OUTPUT)) {
spin_unlock_irqrestore(&chip->open_lock, flags);
snd_sbdsp_reset(chip); /* reset DSP */
} else {
spin_unlock_irqrestore(&chip->open_lock, flags);
}
return 0;
}
static int snd_sb8dsp_midi_output_close(struct snd_rawmidi_substream *substream)
{
unsigned long flags;
struct snd_sb *chip;
chip = substream->rmidi->private_data;
del_timer_sync(&chip->midi_timer);
spin_lock_irqsave(&chip->open_lock, flags);
chip->open &= ~(SB_OPEN_MIDI_OUTPUT | SB_OPEN_MIDI_OUTPUT_TRIGGER);
chip->midi_substream_output = NULL;
if (!(chip->open & SB_OPEN_MIDI_INPUT)) {
spin_unlock_irqrestore(&chip->open_lock, flags);
snd_sbdsp_reset(chip); /* reset DSP */
} else {
spin_unlock_irqrestore(&chip->open_lock, flags);
}
return 0;
}
static void snd_sb8dsp_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
unsigned long flags;
struct snd_sb *chip;
chip = substream->rmidi->private_data;
spin_lock_irqsave(&chip->open_lock, flags);
if (up) {
if (!(chip->open & SB_OPEN_MIDI_INPUT_TRIGGER)) {
if (chip->hardware < SB_HW_20)
snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
chip->open |= SB_OPEN_MIDI_INPUT_TRIGGER;
}
} else {
if (chip->open & SB_OPEN_MIDI_INPUT_TRIGGER) {
if (chip->hardware < SB_HW_20)
snd_sbdsp_command(chip, SB_DSP_MIDI_INPUT_IRQ);
chip->open &= ~SB_OPEN_MIDI_INPUT_TRIGGER;
}
}
spin_unlock_irqrestore(&chip->open_lock, flags);
}
static void snd_sb8dsp_midi_output_write(struct snd_rawmidi_substream *substream)
{
unsigned long flags;
struct snd_sb *chip;
char byte;
int max = 32;
/* how big is Tx FIFO? */
chip = substream->rmidi->private_data;
while (max-- > 0) {
spin_lock_irqsave(&chip->open_lock, flags);
if (snd_rawmidi_transmit_peek(substream, &byte, 1) != 1) {
chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
del_timer(&chip->midi_timer);
spin_unlock_irqrestore(&chip->open_lock, flags);
break;
}
if (chip->hardware >= SB_HW_20) {
int timeout = 8;
while ((inb(SBP(chip, STATUS)) & 0x80) != 0 && --timeout > 0)
;
if (timeout == 0) {
/* Tx FIFO full - try again later */
spin_unlock_irqrestore(&chip->open_lock, flags);
break;
}
outb(byte, SBP(chip, WRITE));
} else {
snd_sbdsp_command(chip, SB_DSP_MIDI_OUTPUT);
snd_sbdsp_command(chip, byte);
}
snd_rawmidi_transmit_ack(substream, 1);
spin_unlock_irqrestore(&chip->open_lock, flags);
}
}
static void snd_sb8dsp_midi_output_timer(struct timer_list *t)
{
struct snd_sb *chip = from_timer(chip, t, midi_timer);
struct snd_rawmidi_substream *substream = chip->midi_substream_output;
unsigned long flags;
spin_lock_irqsave(&chip->open_lock, flags);
mod_timer(&chip->midi_timer, 1 + jiffies);
spin_unlock_irqrestore(&chip->open_lock, flags);
snd_sb8dsp_midi_output_write(substream);
}
static void snd_sb8dsp_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
unsigned long flags;
struct snd_sb *chip;
chip = substream->rmidi->private_data;
spin_lock_irqsave(&chip->open_lock, flags);
if (up) {
if (!(chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER)) {
mod_timer(&chip->midi_timer, 1 + jiffies);
chip->open |= SB_OPEN_MIDI_OUTPUT_TRIGGER;
}
} else {
if (chip->open & SB_OPEN_MIDI_OUTPUT_TRIGGER) {
chip->open &= ~SB_OPEN_MIDI_OUTPUT_TRIGGER;
}
}
spin_unlock_irqrestore(&chip->open_lock, flags);
if (up)
snd_sb8dsp_midi_output_write(substream);
}
static const struct snd_rawmidi_ops snd_sb8dsp_midi_output =
{
.open = snd_sb8dsp_midi_output_open,
.close = snd_sb8dsp_midi_output_close,
.trigger = snd_sb8dsp_midi_output_trigger,
};
static const struct snd_rawmidi_ops snd_sb8dsp_midi_input =
{
.open = snd_sb8dsp_midi_input_open,
.close = snd_sb8dsp_midi_input_close,
.trigger = snd_sb8dsp_midi_input_trigger,
};
int snd_sb8dsp_midi(struct snd_sb *chip, int device)
{
struct snd_rawmidi *rmidi;
int err;
err = snd_rawmidi_new(chip->card, "SB8 MIDI", device, 1, 1, &rmidi);
if (err < 0)
return err;
strcpy(rmidi->name, "SB8 MIDI");
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_sb8dsp_midi_output);
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_sb8dsp_midi_input);
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT;
if (chip->hardware >= SB_HW_20)
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
rmidi->private_data = chip;
timer_setup(&chip->midi_timer, snd_sb8dsp_midi_output_timer, 0);
chip->rmidi = rmidi;
return 0;
}
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