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-rw-r--r--sound/drivers/mpu401/mpu401_uart.c108
1 files changed, 66 insertions, 42 deletions
diff --git a/sound/drivers/mpu401/mpu401_uart.c b/sound/drivers/mpu401/mpu401_uart.c
index b49a45cbf67a..cd64d3eb9ec8 100644
--- a/sound/drivers/mpu401/mpu401_uart.c
+++ b/sound/drivers/mpu401/mpu401_uart.c
@@ -58,22 +58,26 @@ static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
#define MPU401_ACK 0xfe
/* Build in lowlevel io */
-static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data, unsigned long addr)
+static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
+ unsigned long addr)
{
outb(data, addr);
}
-static unsigned char mpu401_read_port(struct snd_mpu401 *mpu, unsigned long addr)
+static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
+ unsigned long addr)
{
return inb(addr);
}
-static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data, unsigned long addr)
+static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
+ unsigned long addr)
{
writeb(data, (void __iomem *)addr);
}
-static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu, unsigned long addr)
+static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
+ unsigned long addr)
{
return readb((void __iomem *)addr);
}
@@ -86,20 +90,22 @@ static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
mpu->read(mpu, MPU401D(mpu));
#ifdef CONFIG_SND_DEBUG
if (timeout <= 0)
- snd_printk("cmd: clear rx timeout (status = 0x%x)\n", mpu->read(mpu, MPU401C(mpu)));
+ snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
+ mpu->read(mpu, MPU401C(mpu)));
#endif
}
static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
{
spin_lock(&mpu->input_lock);
- if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
+ if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
snd_mpu401_uart_input_read(mpu);
- } else {
+ else
snd_mpu401_uart_clear_rx(mpu);
- }
spin_unlock(&mpu->input_lock);
- /* ok. for better Tx performance try do some output when input is done */
+ /* ok. for better Tx performance try do some output when
+ * input is done
+ */
if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
spin_lock(&mpu->output_lock);
@@ -116,7 +122,8 @@ static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
*
* Processes the interrupt for MPU401-UART i/o.
*/
-irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id,
+ struct pt_regs *regs)
{
struct snd_mpu401 *mpu = dev_id;
@@ -126,6 +133,8 @@ irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id, struct pt_regs *reg
return IRQ_HANDLED;
}
+EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
+
/*
* timer callback
* reprogram the timer and call the interrupt job
@@ -159,7 +168,8 @@ static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
mpu->timer.expires = 1 + jiffies;
add_timer(&mpu->timer);
}
- mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER : MPU401_MODE_OUTPUT_TIMER;
+ mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
+ MPU401_MODE_OUTPUT_TIMER;
spin_unlock_irqrestore (&mpu->timer_lock, flags);
}
@@ -172,7 +182,8 @@ static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
spin_lock_irqsave (&mpu->timer_lock, flags);
if (mpu->timer_invoked) {
- mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER : ~MPU401_MODE_OUTPUT_TIMER;
+ mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
+ ~MPU401_MODE_OUTPUT_TIMER;
if (! mpu->timer_invoked)
del_timer(&mpu->timer);
}
@@ -180,11 +191,12 @@ static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
}
/*
-
+ * send a UART command
+ * return zero if successful, non-zero for some errors
*/
static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
- int ack)
+ int ack)
{
unsigned long flags;
int timeout, ok;
@@ -196,11 +208,13 @@ static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
}
/* ok. standard MPU-401 initialization */
if (mpu->hardware != MPU401_HW_SB) {
- for (timeout = 1000; timeout > 0 && !snd_mpu401_output_ready(mpu); timeout--)
+ for (timeout = 1000; timeout > 0 &&
+ !snd_mpu401_output_ready(mpu); timeout--)
udelay(10);
#ifdef CONFIG_SND_DEBUG
if (!timeout)
- snd_printk("cmd: tx timeout (status = 0x%x)\n", mpu->read(mpu, MPU401C(mpu)));
+ snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
+ mpu->read(mpu, MPU401C(mpu)));
#endif
}
mpu->write(mpu, cmd, MPU401C(mpu));
@@ -215,12 +229,14 @@ static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
}
if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
ok = 1;
- } else {
+ } else
ok = 1;
- }
spin_unlock_irqrestore(&mpu->input_lock, flags);
if (!ok) {
- snd_printk("cmd: 0x%x failed at 0x%lx (status = 0x%x, data = 0x%x)\n", cmd, mpu->port, mpu->read(mpu, MPU401C(mpu)), mpu->read(mpu, MPU401D(mpu)));
+ snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
+ "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
+ mpu->read(mpu, MPU401C(mpu)),
+ mpu->read(mpu, MPU401D(mpu)));
return 1;
}
return 0;
@@ -314,7 +330,8 @@ static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
/*
* trigger input callback
*/
-static void snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
+static void
+snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
unsigned long flags;
struct snd_mpu401 *mpu;
@@ -322,7 +339,8 @@ static void snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substrea
mpu = substream->rmidi->private_data;
if (up) {
- if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode)) {
+ if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
+ &mpu->mode)) {
/* first time - flush FIFO */
while (max-- > 0)
mpu->read(mpu, MPU401D(mpu));
@@ -352,13 +370,11 @@ static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
unsigned char byte;
while (max-- > 0) {
- if (snd_mpu401_input_avail(mpu)) {
- byte = mpu->read(mpu, MPU401D(mpu));
- if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
- snd_rawmidi_receive(mpu->substream_input, &byte, 1);
- } else {
+ if (! snd_mpu401_input_avail(mpu))
break; /* input not available */
- }
+ byte = mpu->read(mpu, MPU401D(mpu));
+ if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
+ snd_rawmidi_receive(mpu->substream_input, &byte, 1);
}
}
@@ -380,16 +396,16 @@ static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
int max = 256, timeout;
do {
- if (snd_rawmidi_transmit_peek(mpu->substream_output, &byte, 1) == 1) {
+ if (snd_rawmidi_transmit_peek(mpu->substream_output,
+ &byte, 1) == 1) {
for (timeout = 100; timeout > 0; timeout--) {
- if (snd_mpu401_output_ready(mpu)) {
- mpu->write(mpu, byte, MPU401D(mpu));
- snd_rawmidi_transmit_ack(mpu->substream_output, 1);
+ if (snd_mpu401_output_ready(mpu))
break;
- }
}
if (timeout == 0)
break; /* Tx FIFO full - try again later */
+ mpu->write(mpu, byte, MPU401D(mpu));
+ snd_rawmidi_transmit_ack(mpu->substream_output, 1);
} else {
snd_mpu401_uart_remove_timer (mpu, 0);
break; /* no other data - leave the tx loop */
@@ -400,7 +416,8 @@ static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
/*
* output trigger callback
*/
-static void snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
+static void
+snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
unsigned long flags;
struct snd_mpu401 *mpu;
@@ -499,8 +516,11 @@ int snd_mpu401_uart_new(struct snd_card *card, int device,
mpu->hardware = hardware;
if (!integrated) {
int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
- if ((mpu->res = request_region(port, res_size, "MPU401 UART")) == NULL) {
- snd_printk(KERN_ERR "mpu401_uart: unable to grab port 0x%lx size %d\n", port, res_size);
+ mpu->res = request_region(port, res_size, "MPU401 UART");
+ if (mpu->res == NULL) {
+ snd_printk(KERN_ERR "mpu401_uart: "
+ "unable to grab port 0x%lx size %d\n",
+ port, res_size);
snd_device_free(card, rmidi);
return -EBUSY;
}
@@ -521,8 +541,10 @@ int snd_mpu401_uart_new(struct snd_card *card, int device,
else
mpu->cport = port + 1;
if (irq >= 0 && irq_flags) {
- if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags, "MPU401 UART", (void *) mpu)) {
- snd_printk(KERN_ERR "mpu401_uart: unable to grab IRQ %d\n", irq);
+ if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags,
+ "MPU401 UART", (void *) mpu)) {
+ snd_printk(KERN_ERR "mpu401_uart: "
+ "unable to grab IRQ %d\n", irq);
snd_device_free(card, rmidi);
return -EBUSY;
}
@@ -530,11 +552,14 @@ int snd_mpu401_uart_new(struct snd_card *card, int device,
mpu->irq = irq;
mpu->irq_flags = irq_flags;
if (card->shortname[0])
- snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI", card->shortname);
+ snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
+ card->shortname);
else
- sprintf(rmidi->name, "MPU-401 MIDI %d-%d", card->number, device);
- snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_mpu401_uart_output);
- snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_mpu401_uart_input);
+ sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
+ snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
+ &snd_mpu401_uart_output);
+ snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
+ &snd_mpu401_uart_input);
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
SNDRV_RAWMIDI_INFO_INPUT |
SNDRV_RAWMIDI_INFO_DUPLEX;
@@ -544,7 +569,6 @@ int snd_mpu401_uart_new(struct snd_card *card, int device,
return 0;
}
-EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
EXPORT_SYMBOL(snd_mpu401_uart_new);
/*
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.