diff --git a/drivers/staging/comedi/drivers/aio_iiro_16.c b/drivers/staging/comedi/drivers/aio_iiro_16.c
index f84fb7446994..ae6700637a3b 100644
--- a/drivers/staging/comedi/drivers/aio_iiro_16.c
+++ b/drivers/staging/comedi/drivers/aio_iiro_16.c
@@ -23,16 +23,49 @@
  *
  * Configuration Options:
  *   [0] - I/O port base address
+ *   [1] - IRQ (optional)
+ *
+ * The board supports interrupts on change of state of the digital inputs.
+ * The sample data returned by the async command indicates which inputs
+ * changed state:
+ *
+ *	Bit 7 - IRQ Enable (1) / Disable (0)
+ *	Bit 1 - Input 8-15 Changed State (1 = Changed, 0 = No Change)
+ *	Bit 0 - Input 0-7 Changed State (1 = Changed, 0 = No Change)
  */
 
 #include <linux/module.h>
+#include <linux/interrupt.h>
+
 #include "../comedidev.h"
 
-#define AIO_IIRO_16_RELAY_0_7	0x00
-#define AIO_IIRO_16_INPUT_0_7	0x01
-#define AIO_IIRO_16_IRQ		0x02
-#define AIO_IIRO_16_RELAY_8_15	0x04
-#define AIO_IIRO_16_INPUT_8_15	0x05
+#include "comedi_fc.h"
+
+#define AIO_IIRO_16_RELAY_0_7		0x00
+#define AIO_IIRO_16_INPUT_0_7		0x01
+#define AIO_IIRO_16_IRQ			0x02
+#define AIO_IIRO_16_RELAY_8_15		0x04
+#define AIO_IIRO_16_INPUT_8_15		0x05
+#define AIO_IIRO_16_STATUS		0x07
+#define AIO_IIRO_16_STATUS_IRQE		BIT(7)
+#define AIO_IIRO_16_STATUS_INPUT_8_15	BIT(1)
+#define AIO_IIRO_16_STATUS_INPUT_0_7	BIT(0)
+
+static irqreturn_t aio_iiro_16_cos(int irq, void *d)
+{
+	struct comedi_device *dev = d;
+	struct comedi_subdevice *s = dev->read_subdev;
+	unsigned int status;
+
+	status = inb(dev->iobase + AIO_IIRO_16_STATUS);
+	if (!(status & AIO_IIRO_16_STATUS_IRQE))
+		return IRQ_NONE;
+
+	comedi_buf_write_samples(s, &status, 1);
+	comedi_handle_events(dev, s);
+
+	return IRQ_HANDLED;
+}
 
 static void aio_iiro_enable_irq(struct comedi_device *dev, bool enable)
 {
@@ -42,6 +75,60 @@ static void aio_iiro_enable_irq(struct comedi_device *dev, bool enable)
 		outb(0, dev->iobase + AIO_IIRO_16_IRQ);
 }
 
+static int aio_iiro_16_cos_cancel(struct comedi_device *dev,
+				  struct comedi_subdevice *s)
+{
+	aio_iiro_enable_irq(dev, false);
+
+	return 0;
+}
+
+static int aio_iiro_16_cos_cmd(struct comedi_device *dev,
+			       struct comedi_subdevice *s)
+{
+	aio_iiro_enable_irq(dev, true);
+
+	return 0;
+}
+
+static int aio_iiro_16_cos_cmdtest(struct comedi_device *dev,
+				   struct comedi_subdevice *s,
+				   struct comedi_cmd *cmd)
+{
+	int err = 0;
+
+	/* Step 1 : check if triggers are trivially valid */
+
+	err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
+	err |= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
+	err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_FOLLOW);
+	err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
+	err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_NONE);
+
+	if (err)
+		return 1;
+
+	/* Step 2a : make sure trigger sources are unique */
+	/* Step 2b : and mutually compatible */
+
+	/* Step 3: check if arguments are trivially valid */
+
+	err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
+	err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
+	err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
+	err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
+	err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
+
+	if (err)
+		return 3;
+
+	/* Step 4: fix up any arguments */
+
+	/* Step 5: check channel list if it exists */
+
+	return 0;
+}
+
 static int aio_iiro_16_do_insn_bits(struct comedi_device *dev,
 				    struct comedi_subdevice *s,
 				    struct comedi_insn *insn,
@@ -82,6 +169,17 @@ static int aio_iiro_16_attach(struct comedi_device *dev,
 
 	aio_iiro_enable_irq(dev, false);
 
+	/*
+	 * Digital input change of state interrupts are optionally supported
+	 * using IRQ 2-7, 10-12, 14, or 15.
+	 */
+	if ((1 << it->options[1]) & 0xdcfc) {
+		ret = request_irq(it->options[1], aio_iiro_16_cos, 0,
+				  dev->board_name, dev);
+		if (ret == 0)
+			dev->irq = it->options[1];
+	}
+
 	ret = comedi_alloc_subdevices(dev, 2);
 	if (ret)
 		return ret;
@@ -107,6 +205,14 @@ static int aio_iiro_16_attach(struct comedi_device *dev,
 	s->maxdata	= 1;
 	s->range_table	= &range_digital;
 	s->insn_bits	= aio_iiro_16_di_insn_bits;
+	if (dev->irq) {
+		dev->read_subdev = s;
+		s->subdev_flags	|= SDF_CMD_READ;
+		s->len_chanlist	= 1;
+		s->do_cmdtest	= aio_iiro_16_cos_cmdtest;
+		s->do_cmd	= aio_iiro_16_cos_cmd;
+		s->cancel	= aio_iiro_16_cos_cancel;
+	}
 
 	return 0;
 }