This driver uses an 8254 timer to generate the pacer clock used for analog
input data acquisition. Convert it to use the comedi_8254 module to provide
support for the 8254 timer.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/Kconfig | 1 +
drivers/staging/comedi/drivers/das800.c | 38 +++++++++++----------------------
2 files changed, 14 insertions(+), 25 deletions(-)
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index c15cce4..8de03c8 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -302,6 +302,7 @@ config COMEDI_DAS16
config COMEDI_DAS800
tristate "DAS800 and compatible ISA card support"
+ select COMEDI_8254
---help---
Enable support for Keithley Metrabyte DAS800 and compatible ISA cards
Keithley Metrabyte DAS-800, DAS-801, DAS-802
diff --git a/drivers/staging/comedi/drivers/das800.c b/drivers/staging/comedi/drivers/das800.c
index ff7f4be..50ca03b 100644
--- a/drivers/staging/comedi/drivers/das800.c
+++ b/drivers/staging/comedi/drivers/das800.c
@@ -58,12 +58,12 @@ cmd triggers supported:
#include <linux/module.h>
#include <linux/interrupt.h>
-#include "../comedidev.h"
-
#include <linux/delay.h>
-#include "8253.h"
+#include "../comedidev.h"
+
#include "comedi_fc.h"
+#include "comedi_8254.h"
#define N_CHAN_AI 8 /* number of analog input channels */
@@ -219,8 +219,6 @@ static const struct das800_board das800_boards[] = {
};
struct das800_private {
- unsigned int divisor1; /* counter 1 value for timed conversions */
- unsigned int divisor2; /* counter 2 value for timed conversions */
unsigned int do_bits; /* digital output bits */
};
@@ -272,17 +270,6 @@ static void das800_disable(struct comedi_device *dev)
spin_unlock_irqrestore(&dev->spinlock, irq_flags);
}
-static void das800_set_frequency(struct comedi_device *dev)
-{
- struct das800_private *devpriv = dev->private;
- unsigned long timer_base = dev->iobase + DAS800_8254;
-
- i8254_set_mode(timer_base, 0, 1, I8254_MODE2 | I8254_BINARY);
- i8254_set_mode(timer_base, 0, 2, I8254_MODE2 | I8254_BINARY);
- i8254_write(timer_base, 0, 1, devpriv->divisor1);
- i8254_write(timer_base, 0, 2, devpriv->divisor2);
-}
-
static int das800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
{
das800_disable(dev);
@@ -322,9 +309,7 @@ static int das800_ai_do_cmdtest(struct comedi_device *dev,
struct comedi_cmd *cmd)
{
const struct das800_board *thisboard = dev->board_ptr;
- struct das800_private *devpriv = dev->private;
int err = 0;
- unsigned int arg;
/* Step 1 : check if triggers are trivially valid */
@@ -370,11 +355,9 @@ static int das800_ai_do_cmdtest(struct comedi_device *dev,
/* step 4: fix up any arguments */
if (cmd->convert_src == TRIG_TIMER) {
- arg = cmd->convert_arg;
- i8253_cascade_ns_to_timer(I8254_OSC_BASE_1MHZ,
- &devpriv->divisor1,
- &devpriv->divisor2,
- &arg, cmd->flags);
+ unsigned int arg = cmd->convert_arg;
+
+ comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
}
@@ -426,8 +409,8 @@ static int das800_ai_do_cmd(struct comedi_device *dev,
conv_bits |= DTEN;
if (cmd->convert_src == TRIG_TIMER) {
conv_bits |= CASC | ITE;
- /* set conversion frequency */
- das800_set_frequency(dev);
+ comedi_8254_update_divisors(dev->pacer);
+ comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
}
spin_lock_irqsave(&dev->spinlock, irq_flags);
@@ -697,6 +680,11 @@ static int das800_attach(struct comedi_device *dev, struct comedi_devconfig *it)
dev->irq = irq;
}
+ dev->pacer = comedi_8254_init(dev->iobase + DAS800_8254,
+ I8254_OSC_BASE_1MHZ, I8254_IO8, 0);
+ if (!dev->pacer)
+ return -ENOMEM;
+
ret = comedi_alloc_subdevices(dev, 3);
if (ret)
return ret;
--
2.3.0
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