staging: comedi: ni_at_ao: convert driver to use the comedi_8254 module

The hardware supported by this driver includes an 8254 timer. This timer is
not currently used, other than setting counters 1 and 2 to MODE4 to ensure
that the outputs are high.

For aesthetics, convert it to use the comedi_8254 module to provide support
for the 8254 timer. This will make it easier to add features later.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/Kconfig

@@ -477,6 +477,7 @@ config COMEDI_NI_AT_A2150
 
 config COMEDI_NI_AT_AO
 	tristate "NI AT-AO-6/10 EISA card support"
+	select COMEDI_8254
 	---help---
 	  Enable support for National Instruments AT-AO-6/10 cards
 

drivers/staging/comedi/drivers/ni_at_ao.c

@@ -37,7 +37,7 @@
 
 #include "../comedidev.h"
 
-#include "8253.h"
+#include "comedi_8254.h"
 
 /*
  * Register map
@@ -274,7 +274,6 @@ static int atao_calib_insn_write(struct comedi_device *dev,
 static void atao_reset(struct comedi_device *dev)
 {
 	struct atao_private *devpriv = dev->private;
-	unsigned long timer_base = dev->iobase + ATAO_82C53_BASE;
 
 	/* This is the reset sequence described in the manual */
 
@@ -282,9 +281,9 @@ static void atao_reset(struct comedi_device *dev)
 	outw(devpriv->cfg1, dev->iobase + ATAO_CFG1_REG);
 
 	/* Put outputs of counter 1 and counter 2 in a high state */
-	i8254_set_mode(timer_base, 0, 0, I8254_MODE4 | I8254_BINARY);
-	i8254_set_mode(timer_base, 0, 1, I8254_MODE4 | I8254_BINARY);
-	i8254_write(timer_base, 0, 0, 0x0003);
+	comedi_8254_set_mode(dev->pacer, 0, I8254_MODE4 | I8254_BINARY);
+	comedi_8254_set_mode(dev->pacer, 1, I8254_MODE4 | I8254_BINARY);
+	comedi_8254_write(dev->pacer, 0, 0x0003);
 
 	outw(ATAO_CFG2_CALLD_NOP, dev->iobase + ATAO_CFG2_REG);
 
@@ -315,6 +314,11 @@ static int atao_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	if (!devpriv)
 		return -ENOMEM;
 
+	dev->pacer = comedi_8254_init(dev->iobase + ATAO_82C53_BASE,
+				      0, I8254_IO8, 0);
+	if (!dev->pacer)
+		return -ENOMEM;
+
 	ret = comedi_alloc_subdevices(dev, 4);
 	if (ret)
 		return ret;