[RFC PATCH 19/36] staging: comedi: das1800: convert driver to use the comedi_8254 module
H Hartley Sweeten
hsweeten at visionengravers.com
Fri Feb 20 23:04:58 UTC 2015
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.
Tidy up the (*do_cmdtest) validation of the timer arguments.
Absorb the converted das1800_setup_counters() code into the (*do_cmd).
Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ian Abbott <abbotti at mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
drivers/staging/comedi/Kconfig | 1 +
drivers/staging/comedi/drivers/das1800.c | 81 ++++++++++++--------------------
2 files changed, 30 insertions(+), 52 deletions(-)
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index fbff2fa..f088685 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -316,6 +316,7 @@ config COMEDI_DAS800
config COMEDI_DAS1800
tristate "DAS1800 and compatible ISA card support"
select COMEDI_ISADMA if ISA_DMA_API
+ select COMEDI_8254
---help---
Enable support for DAS1800 and compatible ISA cards
Keithley Metrabyte DAS-1701ST, DAS-1701ST-DA, DAS-1701/AO,
diff --git a/drivers/staging/comedi/drivers/das1800.c b/drivers/staging/comedi/drivers/das1800.c
index 0790a28..3eb02e8 100644
--- a/drivers/staging/comedi/drivers/das1800.c
+++ b/drivers/staging/comedi/drivers/das1800.c
@@ -103,7 +103,7 @@ TODO:
#include "comedi_isadma.h"
#include "comedi_fc.h"
-#include "8253.h"
+#include "comedi_8254.h"
/* misc. defines */
#define DAS1800_SIZE 16 /* uses 16 io addresses */
@@ -422,8 +422,6 @@ static const struct das1800_board das1800_boards[] = {
struct das1800_private {
struct comedi_isadma *dma;
- unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */
- unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */
int irq_dma_bits; /* bits for control register b */
/* dma bits for control register b, stored so that dma can be
* turned on and off */
@@ -731,7 +729,6 @@ static int das1800_ai_do_cmdtest(struct comedi_device *dev,
struct comedi_cmd *cmd)
{
const struct das1800_board *thisboard = dev->board_ptr;
- struct das1800_private *devpriv = dev->private;
int err = 0;
unsigned int arg;
@@ -795,35 +792,23 @@ static int das1800_ai_do_cmdtest(struct comedi_device *dev,
cmd->convert_src == TRIG_TIMER) {
/* we are not in burst mode */
arg = cmd->convert_arg;
- i8253_cascade_ns_to_timer(I8254_OSC_BASE_5MHZ,
- &devpriv->divisor1,
- &devpriv->divisor2,
- &cmd->convert_arg, cmd->flags);
- if (arg != cmd->convert_arg)
- err++;
+ comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
+ err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
} else if (cmd->convert_src == TRIG_TIMER) {
/* we are in burst mode */
- arg = cmd->convert_arg;
- cmd->convert_arg = burst_convert_arg(cmd->convert_arg,
- cmd->flags);
- if (arg != cmd->convert_arg)
- err++;
+ arg = burst_convert_arg(cmd->convert_arg, cmd->flags);
+ err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
if (cmd->scan_begin_src == TRIG_TIMER) {
arg = cmd->convert_arg * cmd->chanlist_len;
- if (arg > cmd->scan_begin_arg) {
- cmd->scan_begin_arg = arg;
- err++;
- }
+ err |= cfc_check_trigger_arg_max(&cmd->scan_begin_arg,
+ arg);
arg = cmd->scan_begin_arg;
- i8253_cascade_ns_to_timer(I8254_OSC_BASE_5MHZ,
- &devpriv->divisor1,
- &devpriv->divisor2,
- &cmd->scan_begin_arg,
- cmd->flags);
- if (arg != cmd->scan_begin_arg)
- err++;
+ comedi_8254_cascade_ns_to_timer(dev->pacer, &arg,
+ cmd->flags);
+ err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg,
+ arg);
}
}
@@ -910,31 +895,6 @@ static int control_c_bits(const struct comedi_cmd *cmd)
return control_c;
}
-static void das1800_setup_counters(struct comedi_device *dev,
- const struct comedi_cmd *cmd)
-{
- struct das1800_private *devpriv = dev->private;
- unsigned long timer_base = dev->iobase + DAS1800_COUNTER;
-
- /* setup cascaded counters for conversion/scan frequency */
- if ((cmd->scan_begin_src == TRIG_FOLLOW ||
- cmd->scan_begin_src == TRIG_TIMER) &&
- cmd->convert_src == TRIG_TIMER) {
- 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);
- }
-
- /* setup counter 0 for 'about triggering' */
- if (cmd->stop_src == TRIG_EXT) {
- i8254_set_mode(timer_base, 0, 0, I8254_MODE0 | I8254_BINARY);
-
- i8254_write(timer_base, 0, 0, 1);
- }
-}
-
static unsigned int das1800_ai_transfer_size(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int maxbytes,
@@ -1053,7 +1013,19 @@ static int das1800_ai_do_cmd(struct comedi_device *dev,
/* setup card and start */
program_chanlist(dev, cmd);
- das1800_setup_counters(dev, cmd);
+
+ /* setup cascaded counters for conversion/scan frequency */
+ if ((cmd->scan_begin_src == TRIG_FOLLOW ||
+ cmd->scan_begin_src == TRIG_TIMER) &&
+ cmd->convert_src == TRIG_TIMER) {
+ comedi_8254_update_divisors(dev->pacer);
+ comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
+ }
+
+ /* setup counter 0 for 'about triggering' */
+ if (cmd->stop_src == TRIG_EXT)
+ comedi_8254_load(dev->pacer, 0, 1, I8254_MODE0 | I8254_BINARY);
+
das1800_ai_setup_dma(dev, s);
outb(control_c, dev->iobase + DAS1800_CONTROL_C);
/* set conversion rate and length for burst mode */
@@ -1378,6 +1350,11 @@ static int das1800_attach(struct comedi_device *dev,
if (!devpriv->fifo_buf)
return -ENOMEM;
+ dev->pacer = comedi_8254_init(dev->iobase + DAS1800_COUNTER,
+ I8254_OSC_BASE_5MHZ, I8254_IO8, 0);
+ if (!dev->pacer)
+ return -ENOMEM;
+
ret = comedi_alloc_subdevices(dev, 4);
if (ret)
return ret;
--
2.3.0
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