staging: comedi: das6402: convert driver to use the comedi_8254 module
This driver uses an 8254 timer to generate the pacer clock used for analog
input data conversion. Convert it to use the comedi_8254 module to provide
support for the 8254 timer.
Remove the unnecessary programming of timer 0. The private data 'count'
value is never set by the driver and the timer is reset to MODE0 when
the timers are initialized during the attach of the driver.
Remove the unnecessart convert_src check in the (*do_cmdtest). The only
valid convert_src is TRIG_TIMER.
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>
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index b90b8a8..fbff2fa 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -329,6 +329,7 @@
config COMEDI_DAS6402
tristate "DAS6402 and compatible ISA card support"
+ select COMEDI_8254
---help---
Enable support for DAS6402 and compatible ISA cards
Computerboards, Keithley Metrabyte DAS6402 and compatibles
diff --git a/drivers/staging/comedi/drivers/das6402.c b/drivers/staging/comedi/drivers/das6402.c
index b8755b5..3aa6b13 100644
--- a/drivers/staging/comedi/drivers/das6402.c
+++ b/drivers/staging/comedi/drivers/das6402.c
@@ -35,8 +35,9 @@
#include <linux/interrupt.h>
#include "../comedidev.h"
+
#include "comedi_fc.h"
-#include "8253.h"
+#include "comedi_8254.h"
/*
* Register I/O map
@@ -138,11 +139,6 @@
struct das6402_private {
unsigned int irq;
-
- unsigned int count;
- unsigned int divider1;
- unsigned int divider2;
-
unsigned int ao_range;
};
@@ -172,27 +168,6 @@
outb(DAS6402_STATUS_W_CLRINT, dev->iobase + DAS6402_STATUS_REG);
}
-static void das6402_enable_counter(struct comedi_device *dev, bool load)
-{
- struct das6402_private *devpriv = dev->private;
- unsigned long timer_iobase = dev->iobase + DAS6402_TIMER_BASE;
-
- if (load) {
- i8254_set_mode(timer_iobase, 0, 0, I8254_MODE0 | I8254_BINARY);
- i8254_set_mode(timer_iobase, 0, 1, I8254_MODE2 | I8254_BINARY);
- i8254_set_mode(timer_iobase, 0, 2, I8254_MODE2 | I8254_BINARY);
-
- i8254_write(timer_iobase, 0, 0, devpriv->count);
- i8254_write(timer_iobase, 0, 1, devpriv->divider1);
- i8254_write(timer_iobase, 0, 2, devpriv->divider2);
-
- } else {
- i8254_set_mode(timer_iobase, 0, 0, I8254_MODE0 | I8254_BINARY);
- i8254_set_mode(timer_iobase, 0, 1, I8254_MODE0 | I8254_BINARY);
- i8254_set_mode(timer_iobase, 0, 2, I8254_MODE0 | I8254_BINARY);
- }
-}
-
static unsigned int das6402_ai_read_sample(struct comedi_device *dev,
struct comedi_subdevice *s)
{
@@ -267,7 +242,8 @@
outw(DAS6402_AI_MUX_HI(chan_hi) | DAS6402_AI_MUX_LO(chan_lo),
dev->iobase + DAS6402_AI_MUX_REG);
- das6402_enable_counter(dev, true);
+ comedi_8254_update_divisors(dev->pacer);
+ comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
/* enable interrupt and pacer trigger */
outb(DAS6402_CTRL_INTE |
@@ -322,7 +298,6 @@
struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
- struct das6402_private *devpriv = dev->private;
int err = 0;
unsigned int arg;
@@ -364,14 +339,9 @@
/* step 4: fix up any arguments */
- if (cmd->convert_src == TRIG_TIMER) {
- arg = cmd->convert_arg;
- i8253_cascade_ns_to_timer(I8254_OSC_BASE_10MHZ,
- &devpriv->divider1,
- &devpriv->divider2,
- &arg, cmd->flags);
- err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
- }
+ 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);
if (err)
return 4;
@@ -581,8 +551,6 @@
outw(0, dev->iobase + DAS6402_AO_DATA_REG(0));
inw(dev->iobase + DAS6402_AO_LSB_REG(0));
- das6402_enable_counter(dev, false);
-
/* set all digital outputs low */
outb(0, dev->iobase + DAS6402_DI_DO_REG);
@@ -631,6 +599,11 @@
}
}
+ dev->pacer = comedi_8254_init(dev->iobase + DAS6402_TIMER_BASE,
+ I8254_OSC_BASE_10MHZ, I8254_IO8, 0);
+ if (!dev->pacer)
+ return -ENOMEM;
+
ret = comedi_alloc_subdevices(dev, 4);
if (ret)
return ret;