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linux-next/sound/pci/ca0106/ca_midi.c
Takashi Iwai 59c39cd300 ALSA: ca0106: Fix assignment in if condition 
PCI CA0106 driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.

This patch is merely for coding-style fixes, no functional changes.

Link: https://lore.kernel.org/r/20210608140540.17885-37-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-06-09 17:30:05 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 10/16/2005 Tilman Kranz <tilde@tk-sls.de>
* Creative Audio MIDI, for the CA0106 Driver
* Version: 0.0.1
*
* Changelog:
* Implementation is based on mpu401 and emu10k1x and
* tested with ca0106.
* mpu401: Copyright (c) by Jaroslav Kysela <perex@perex.cz>
* emu10k1x: Copyright (c) by Francisco Moraes <fmoraes@nc.rr.com>
*/
#include <linux/spinlock.h>
#include <sound/core.h>
#include <sound/rawmidi.h>
#include "ca_midi.h"
#define ca_midi_write_data(midi, data) midi->write(midi, data, 0)
#define ca_midi_write_cmd(midi, data) midi->write(midi, data, 1)
#define ca_midi_read_data(midi) midi->read(midi, 0)
#define ca_midi_read_stat(midi) midi->read(midi, 1)
#define ca_midi_input_avail(midi) (!(ca_midi_read_stat(midi) & midi->input_avail))
#define ca_midi_output_ready(midi) (!(ca_midi_read_stat(midi) & midi->output_ready))
static void ca_midi_clear_rx(struct snd_ca_midi *midi)
{
int timeout = 100000;
for (; timeout > 0 && ca_midi_input_avail(midi); timeout--)
ca_midi_read_data(midi);
#ifdef CONFIG_SND_DEBUG
if (timeout <= 0)
pr_err("ca_midi_clear_rx: timeout (status = 0x%x)\n",
ca_midi_read_stat(midi));
#endif
}
static void ca_midi_interrupt(struct snd_ca_midi *midi, unsigned int status)
{
unsigned char byte;
if (midi->rmidi == NULL) {
midi->interrupt_disable(midi,midi->tx_enable | midi->rx_enable);
return;
}
spin_lock(&midi->input_lock);
if ((status & midi->ipr_rx) && ca_midi_input_avail(midi)) {
if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
ca_midi_clear_rx(midi);
} else {
byte = ca_midi_read_data(midi);
if(midi->substream_input)
snd_rawmidi_receive(midi->substream_input, &byte, 1);
}
}
spin_unlock(&midi->input_lock);
spin_lock(&midi->output_lock);
if ((status & midi->ipr_tx) && ca_midi_output_ready(midi)) {
if (midi->substream_output &&
snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
ca_midi_write_data(midi, byte);
} else {
midi->interrupt_disable(midi,midi->tx_enable);
}
}
spin_unlock(&midi->output_lock);
}
static void ca_midi_cmd(struct snd_ca_midi *midi, unsigned char cmd, int ack)
{
unsigned long flags;
int timeout, ok;
spin_lock_irqsave(&midi->input_lock, flags);
ca_midi_write_data(midi, 0x00);
/* ca_midi_clear_rx(midi); */
ca_midi_write_cmd(midi, cmd);
if (ack) {
ok = 0;
timeout = 10000;
while (!ok && timeout-- > 0) {
if (ca_midi_input_avail(midi)) {
if (ca_midi_read_data(midi) == midi->ack)
ok = 1;
}
}
if (!ok && ca_midi_read_data(midi) == midi->ack)
ok = 1;
} else {
ok = 1;
}
spin_unlock_irqrestore(&midi->input_lock, flags);
if (!ok)
pr_err("ca_midi_cmd: 0x%x failed at 0x%x (status = 0x%x, data = 0x%x)!!!\n",
cmd,
midi->get_dev_id_port(midi->dev_id),
ca_midi_read_stat(midi),
ca_midi_read_data(midi));
}
static int ca_midi_input_open(struct snd_rawmidi_substream *substream)
{
struct snd_ca_midi *midi = substream->rmidi->private_data;
unsigned long flags;
if (snd_BUG_ON(!midi->dev_id))
return -ENXIO;
spin_lock_irqsave(&midi->open_lock, flags);
midi->midi_mode |= CA_MIDI_MODE_INPUT;
midi->substream_input = substream;
if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
spin_unlock_irqrestore(&midi->open_lock, flags);
ca_midi_cmd(midi, midi->reset, 1);
ca_midi_cmd(midi, midi->enter_uart, 1);
} else {
spin_unlock_irqrestore(&midi->open_lock, flags);
}
return 0;
}
static int ca_midi_output_open(struct snd_rawmidi_substream *substream)
{
struct snd_ca_midi *midi = substream->rmidi->private_data;
unsigned long flags;
if (snd_BUG_ON(!midi->dev_id))
return -ENXIO;
spin_lock_irqsave(&midi->open_lock, flags);
midi->midi_mode |= CA_MIDI_MODE_OUTPUT;
midi->substream_output = substream;
if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
spin_unlock_irqrestore(&midi->open_lock, flags);
ca_midi_cmd(midi, midi->reset, 1);
ca_midi_cmd(midi, midi->enter_uart, 1);
} else {
spin_unlock_irqrestore(&midi->open_lock, flags);
}
return 0;
}
static int ca_midi_input_close(struct snd_rawmidi_substream *substream)
{
struct snd_ca_midi *midi = substream->rmidi->private_data;
unsigned long flags;
if (snd_BUG_ON(!midi->dev_id))
return -ENXIO;
spin_lock_irqsave(&midi->open_lock, flags);
midi->interrupt_disable(midi,midi->rx_enable);
midi->midi_mode &= ~CA_MIDI_MODE_INPUT;
midi->substream_input = NULL;
if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
spin_unlock_irqrestore(&midi->open_lock, flags);
ca_midi_cmd(midi, midi->reset, 0);
} else {
spin_unlock_irqrestore(&midi->open_lock, flags);
}
return 0;
}
static int ca_midi_output_close(struct snd_rawmidi_substream *substream)
{
struct snd_ca_midi *midi = substream->rmidi->private_data;
unsigned long flags;
if (snd_BUG_ON(!midi->dev_id))
return -ENXIO;
spin_lock_irqsave(&midi->open_lock, flags);
midi->interrupt_disable(midi,midi->tx_enable);
midi->midi_mode &= ~CA_MIDI_MODE_OUTPUT;
midi->substream_output = NULL;
if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
spin_unlock_irqrestore(&midi->open_lock, flags);
ca_midi_cmd(midi, midi->reset, 0);
} else {
spin_unlock_irqrestore(&midi->open_lock, flags);
}
return 0;
}
static void ca_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
struct snd_ca_midi *midi = substream->rmidi->private_data;
if (snd_BUG_ON(!midi->dev_id))
return;
if (up) {
midi->interrupt_enable(midi,midi->rx_enable);
} else {
midi->interrupt_disable(midi, midi->rx_enable);
}
}
static void ca_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
struct snd_ca_midi *midi = substream->rmidi->private_data;
unsigned long flags;
if (snd_BUG_ON(!midi->dev_id))
return;
if (up) {
int max = 4;
unsigned char byte;
spin_lock_irqsave(&midi->output_lock, flags);
/* try to send some amount of bytes here before interrupts */
while (max > 0) {
if (ca_midi_output_ready(midi)) {
if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT) ||
snd_rawmidi_transmit(substream, &byte, 1) != 1) {
/* no more data */
spin_unlock_irqrestore(&midi->output_lock, flags);
return;
}
ca_midi_write_data(midi, byte);
max--;
} else {
break;
}
}
spin_unlock_irqrestore(&midi->output_lock, flags);
midi->interrupt_enable(midi,midi->tx_enable);
} else {
midi->interrupt_disable(midi,midi->tx_enable);
}
}
static const struct snd_rawmidi_ops ca_midi_output =
{
.open = ca_midi_output_open,
.close = ca_midi_output_close,
.trigger = ca_midi_output_trigger,
};
static const struct snd_rawmidi_ops ca_midi_input =
{
.open = ca_midi_input_open,
.close = ca_midi_input_close,
.trigger = ca_midi_input_trigger,
};
static void ca_midi_free(struct snd_ca_midi *midi)
{
midi->interrupt = NULL;
midi->interrupt_enable = NULL;
midi->interrupt_disable = NULL;
midi->read = NULL;
midi->write = NULL;
midi->get_dev_id_card = NULL;
midi->get_dev_id_port = NULL;
midi->rmidi = NULL;
}
static void ca_rmidi_free(struct snd_rawmidi *rmidi)
{
ca_midi_free(rmidi->private_data);
}
int ca_midi_init(void *dev_id, struct snd_ca_midi *midi, int device, char *name)
{
struct snd_rawmidi *rmidi;
int err;
err = snd_rawmidi_new(midi->get_dev_id_card(midi->dev_id), name, device, 1, 1, &rmidi);
if (err < 0)
return err;
midi->dev_id = dev_id;
midi->interrupt = ca_midi_interrupt;
spin_lock_init(&midi->open_lock);
spin_lock_init(&midi->input_lock);
spin_lock_init(&midi->output_lock);
strcpy(rmidi->name, name);
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &ca_midi_output);
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &ca_midi_input);
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
SNDRV_RAWMIDI_INFO_INPUT |
SNDRV_RAWMIDI_INFO_DUPLEX;
rmidi->private_data = midi;
rmidi->private_free = ca_rmidi_free;
midi->rmidi = rmidi;
return 0;
}
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