static int uart6850_out(int dev, unsigned char midi_byte)
{
int timeout;
unsigned long flags;
/*
* Test for input since pending input seems to block the output.
*/
spin_lock_irqsave(&lock,flags);
if (input_avail())
uart6850_input_loop();
spin_unlock_irqrestore(&lock,flags);
/*
* Sometimes it takes about 13000 loops before the output becomes ready
* (After reset). Normally it takes just about 10 loops.
*/
for (timeout = 30000; timeout > 0 && !output_ready(); timeout--); /*
* Wait
*/
if (!output_ready())
{
printk(KERN_WARNING "Midi6850: Timeout\n");
return 0;
}
uart6850_write(midi_byte);
return 1;
}
static void poll_uart6850(unsigned long dummy)
{
unsigned long flags;
if (!(uart6850_opened & OPEN_READ))
return; /* Device has been closed */
spin_lock_irqsave(&lock,flags);
if (input_avail())
uart6850_input_loop();
uart6850_timer.expires = 1 + jiffies;
add_timer(&uart6850_timer);
/*
* Come back later
*/
spin_unlock_irqrestore(&lock,flags);
}
static int uart6850_open(int dev, int mode,
void (*input) (int dev, unsigned char data),
void (*output) (int dev)
)
{
if (uart6850_opened)
{
/* printk("Midi6850: Midi busy\n");*/
return -EBUSY;
};
uart6850_cmd(UART_RESET);
uart6850_input_loop();
midi_input_intr = input;
uart6850_opened = mode;
poll_uart6850(0); /*
* Enable input polling
*/
return 0;
}
static void
poll_uart6850 (unsigned long dummy)
{
unsigned long flags;
DEFINE_TIMER (uart6850_timer, poll_uart6850);
if (!(uart6850_opened & OPEN_READ))
return; /*
* No longer required
*/
DISABLE_INTR (flags);
if (input_avail ())
uart6850_input_loop ();
ACTIVATE_TIMER (uart6850_timer, poll_uart6850, 1); /*
* Come back later
*/
RESTORE_INTR (flags);
}
static irqreturn_t m6850intr(int irq, void *dev_id)
{
if (input_avail())
uart6850_input_loop();
return IRQ_HANDLED;
}
static irqreturn_t m6850intr(int irq, void *dev_id, struct pt_regs *dummy)
{
if (input_avail())
uart6850_input_loop();
return IRQ_HANDLED;
}
void
m6850intr (int unit)
{
if (input_avail ())
uart6850_input_loop ();
}