diff --git a/drivers/staging/comedi/drivers/addi_apci_1564.c b/drivers/staging/comedi/drivers/addi_apci_1564.c
index fbc82ad0de3ab6f326430d8ad85528151aca0400..1198540e0a2d16715b077f1f829369834532ffaf 100644
--- a/drivers/staging/comedi/drivers/addi_apci_1564.c
+++ b/drivers/staging/comedi/drivers/addi_apci_1564.c
@@ -47,7 +47,7 @@ static int apci1564_auto_attach(struct comedi_device *dev,
 	const struct addi_board *this_board = comedi_board(dev);
 	struct addi_private *devpriv;
 	struct comedi_subdevice *s;
-	int ret, n_subdevices;
+	int ret;
 
 	dev->board_name = this_board->pc_DriverName;
 
@@ -69,21 +69,12 @@ static int apci1564_auto_attach(struct comedi_device *dev,
 			dev->irq = pcidev->irq;
 	}
 
-	n_subdevices = 7;
-	ret = comedi_alloc_subdevices(dev, n_subdevices);
+	ret = comedi_alloc_subdevices(dev, 3);
 	if (ret)
 		return ret;
 
-	/*  Allocate and Initialise AI Subdevice Structures */
-	s = &dev->subdevices[0];
-	s->type = COMEDI_SUBD_UNUSED;
-
-	/*  Allocate and Initialise AO Subdevice Structures */
-	s = &dev->subdevices[1];
-	s->type = COMEDI_SUBD_UNUSED;
-
 	/*  Allocate and Initialise DI Subdevice Structures */
-	s = &dev->subdevices[2];
+	s = &dev->subdevices[0];
 	s->type = COMEDI_SUBD_DI;
 	s->subdev_flags = SDF_READABLE;
 	s->n_chan = 32;
@@ -94,7 +85,7 @@ static int apci1564_auto_attach(struct comedi_device *dev,
 	s->insn_bits = apci1564_di_insn_bits;
 
 	/*  Allocate and Initialise DO Subdevice Structures */
-	s = &dev->subdevices[3];
+	s = &dev->subdevices[1];
 	s->type = COMEDI_SUBD_DO;
 	s->subdev_flags = SDF_WRITEABLE;
 	s->n_chan = 32;
@@ -106,7 +97,7 @@ static int apci1564_auto_attach(struct comedi_device *dev,
 	s->insn_read = apci1564_do_read;
 
 	/*  Allocate and Initialise Timer Subdevice Structures */
-	s = &dev->subdevices[4];
+	s = &dev->subdevices[2];
 	if (this_board->i_Timer) {
 		s->type = COMEDI_SUBD_TIMER;
 		s->subdev_flags = SDF_WRITEABLE | SDF_GROUND | SDF_COMMON;
@@ -123,14 +114,6 @@ static int apci1564_auto_attach(struct comedi_device *dev,
 		s->type = COMEDI_SUBD_UNUSED;
 	}
 
-	/*  Allocate and Initialise TTL */
-	s = &dev->subdevices[5];
-	s->type = COMEDI_SUBD_UNUSED;
-
-	/* EEPROM */
-	s = &dev->subdevices[6];
-	s->type = COMEDI_SUBD_UNUSED;
-
 	i_ADDI_Reset(dev);
 	return 0;
 }