Clarify the timer operations by using the helper functions in 8253.h.
For aesthetics, factor the "ai start conversion" code out of daq700_ai_rinsn().
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gr...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/ni_daq_700.c | 35 ++++++++++++++++++++---------
1 file changed, 24 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_daq_700.c
b/drivers/staging/comedi/drivers/ni_daq_700.c
index 4d5cb5a..16b52b6 100644
--- a/drivers/staging/comedi/drivers/ni_daq_700.c
+++ b/drivers/staging/comedi/drivers/ni_daq_700.c
@@ -51,11 +51,18 @@
#include <linux/delay.h>
#include <linux/interrupt.h>
-#include "../comedidev.h"
-
#include <pcmcia/cistpl.h>
#include <pcmcia/ds.h>
+#include "../comedidev.h"
+
+#include "8253.h"
+
+/*
+ * Regsiter I/O map
+ */
+#define DAQ700_TIMER_BASE 0x08
+
/* daqcard700 registers */
#define DIO_W 0x04 /* WO 8bit */
#define DIO_R 0x05 /* RO 8bit */
@@ -66,10 +73,6 @@
#define STA_R2 0x01 /* RO 8bit */
#define ADFIFO_R 0x02 /* RO 16bit */
#define ADCLEAR_R 0x01 /* WO 8bit */
-#define CDA_R0 0x08 /* RW 8bit */
-#define CDA_R1 0x09 /* RW 8bit */
-#define CDA_R2 0x0A /* RW 8bit */
-#define CMO_R 0x0B /* RO 8bit */
#define TIC_R 0x06 /* WO 8bit */
/* daqcard700 modes */
#define CMD_R3_DIFF 0x04 /* diff mode */
@@ -122,6 +125,18 @@ static int daq700_dio_insn_config(struct comedi_device
*dev,
return insn->n;
}
+static void daq700_ai_start_conv(struct comedi_device *dev)
+{
+ /*
+ * Manually trigger an A/D conversion with a low-to-high
+ * transition of OUT0.
+ */
+ i8254_set_mode(dev->iobase + DAQ700_TIMER_BASE, 0,
+ 0, I8254_MODE0 | I8254_BINARY); /* OUT0 low */
+ i8254_set_mode(dev->iobase + DAQ700_TIMER_BASE, 0,
+ 0, I8254_MODE1 | I8254_BINARY); /* OUT0 high */
+}
+
static int daq700_ai_eoc(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
@@ -168,10 +183,7 @@ static int daq700_ai_rinsn(struct comedi_device *dev,
/* convert n samples */
for (n = 0; n < insn->n; n++) {
- /* trigger conversion with out0 L to H */
- outb(0x30, dev->iobase + CMO_R); /* mode 0 out0 L, from H */
- /* mode 1 out0 H, L to H, start conversion */
- outb(0x32, dev->iobase + CMO_R);
+ daq700_ai_start_conv(dev);
/* wait for conversion to end */
ret = comedi_timeout(dev, s, insn, daq700_ai_eoc, 0);
@@ -208,7 +220,8 @@ static void daq700_ai_config(struct comedi_device *dev,
outb(0x80, iobase + CMD_R1); /* disable scanning, ADC to chan 0 */
outb(0x00, iobase + CMD_R2); /* clear all bits */
outb(0x00, iobase + CMD_R3); /* set +-10 range */
- outb(0x32, iobase + CMO_R); /* config counter mode1, out0 to H */
+ i8254_set_mode(iobase + DAQ700_TIMER_BASE, 0,
+ 0, I8254_MODE1 | I8254_BINARY); /* OUT0 high */
outb(0x00, iobase + TIC_R); /* clear counter interrupt */
outb(0x00, iobase + ADCLEAR_R); /* clear the ADC FIFO */
inw(iobase + ADFIFO_R); /* read 16bit junk from FIFO to clear */
--
1.9.3
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