1 files changed, 49 insertions, 0 deletions

diff --git a/drivers/tty/hvc/hvc_irq.c b/drivers/tty/hvc/hvc_irq.c
new file mode 100644
index 000000000000..2623e177e8d6
--- /dev/null
+++ b/drivers/tty/hvc/hvc_irq.c
@@ -0,0 +1,49 @@
+/*
+ * 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 (!hp->irq_requested)
+                return;
+        free_irq(irq, hp);
+        hp->irq_requested = 0;
+}
+
+void notifier_hangup_irq(struct hvc_struct *hp, int irq)
+{
+        notifier_del_irq(hp, irq);
+}