android_kernel_xiaomi_sm8350/drivers/char/hvc_irq.c
Hendrik Brueckner fc362e2e0e hvc_console: Add a hangup notifier for backends
I have added a hangup notifier that can be used by hvc console
backends to handle a tty hangup. The default irq hangup notifier
calls the notifier_del_irq() for compatibility.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2008-10-22 10:59:54 +11:00

50 lines
891 B
C

/*
* Copyright IBM Corp. 2001,2008
*
* This file contains the IRQ specific code for hvc_console
*
*/
#include <linux/interrupt.h>
#include "hvc_console.h"
static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)
{
/* if hvc_poll request a repoll, then kick the hvcd thread */
if (hvc_poll(dev_instance))
hvc_kick();
return IRQ_HANDLED;
}
/*
* For IRQ based systems these callbacks can be used
*/
int notifier_add_irq(struct hvc_struct *hp, int irq)
{
int rc;
if (!irq) {
hp->irq_requested = 0;
return 0;
}
rc = request_irq(irq, hvc_handle_interrupt, IRQF_DISABLED,
"hvc_console", hp);
if (!rc)
hp->irq_requested = 1;
return rc;
}
void notifier_del_irq(struct hvc_struct *hp, int irq)
{
if (!irq)
return;
free_irq(irq, hp);
hp->irq_requested = 0;
}
void notifier_hangup_irq(struct hvc_struct *hp, int irq)
{
notifier_del_irq(hp, irq);
}