[PATCH 6/6] staging: comedi: ni_labpc: split common code to ni_labpc_common

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The "ni_labpc" module is a Comedi driver for the National Instruments
Lab-PC series of ISA data acquistion boards, and also provides common
code for the "ni_labpc_pci" and "ni_labpci_cs" modules (for PCI boards
and PCMCIA cards).

Split out the common code into a new module "ni_labpc_common", leaving
the driver for the ISA boards in the existing "ni_labpc" module.  This
removes the C preprocessor conditional directives from the resulting
".c" files (although they remain in the included header file
"ni_labpc_isadma.h").

Unneccessary `#include` directives have been removed from the resulting
".c" files.

Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
---
 drivers/staging/comedi/drivers/Makefile          |    3 +-
 drivers/staging/comedi/drivers/ni_labpc.c        | 1366 +--------------------
 drivers/staging/comedi/drivers/ni_labpc_common.c | 1387 ++++++++++++++++++++++
 3 files changed, 1390 insertions(+), 1366 deletions(-)
 create mode 100644 drivers/staging/comedi/drivers/ni_labpc_common.c

diff --git a/drivers/staging/comedi/drivers/Makefile b/drivers/staging/comedi/drivers/Makefile
index 87ac791..12b20bb 100644
--- a/drivers/staging/comedi/drivers/Makefile
+++ b/drivers/staging/comedi/drivers/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_COMEDI_NI_AT_A2150)	+= ni_at_a2150.o
 obj-$(CONFIG_COMEDI_NI_AT_AO)		+= ni_at_ao.o
 obj-$(CONFIG_COMEDI_NI_ATMIO)		+= ni_atmio.o
 obj-$(CONFIG_COMEDI_NI_ATMIO16D)	+= ni_atmio16d.o
+obj-$(CONFIG_COMEDI_NI_LABPC_ISA)	+= ni_labpc.o
 obj-$(CONFIG_COMEDI_PCMAD)		+= pcmad.o
 obj-$(CONFIG_COMEDI_PCMDA12)		+= pcmda12.o
 obj-$(CONFIG_COMEDI_PCMMIO)		+= pcmmio.o
@@ -135,7 +136,7 @@ obj-$(CONFIG_COMEDI_VMK80XX)		+= vmk80xx.o
 obj-$(CONFIG_COMEDI_MITE)		+= mite.o
 obj-$(CONFIG_COMEDI_NI_TIO)		+= ni_tio.o
 obj-$(CONFIG_COMEDI_NI_TIOCMD)		+= ni_tiocmd.o
-obj-$(CONFIG_COMEDI_NI_LABPC)		+= ni_labpc.o
+obj-$(CONFIG_COMEDI_NI_LABPC)		+= ni_labpc_common.o
 obj-$(CONFIG_COMEDI_NI_LABPC_ISADMA)	+= ni_labpc_isadma.o
 
 obj-$(CONFIG_COMEDI_8255)		+= 8255.o
diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c
index ccf5ce8..1fbfdb4 100644
--- a/drivers/staging/comedi/drivers/ni_labpc.c
+++ b/drivers/staging/comedi/drivers/ni_labpc.c
@@ -58,99 +58,12 @@
  */
 
 #include <linux/module.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-#include <linux/io.h>
-#include <linux/delay.h>
 
 #include "../comedidev.h"
 
-#include "8253.h"
-#include "8255.h"
-#include "comedi_fc.h"
 #include "ni_labpc.h"
-#include "ni_labpc_regs.h"
 #include "ni_labpc_isadma.h"
 
-enum scan_mode {
-	MODE_SINGLE_CHAN,
-	MODE_SINGLE_CHAN_INTERVAL,
-	MODE_MULT_CHAN_UP,
-	MODE_MULT_CHAN_DOWN,
-};
-
-static const struct comedi_lrange range_labpc_plus_ai = {
-	16, {
-		BIP_RANGE(5),
-		BIP_RANGE(4),
-		BIP_RANGE(2.5),
-		BIP_RANGE(1),
-		BIP_RANGE(0.5),
-		BIP_RANGE(0.25),
-		BIP_RANGE(0.1),
-		BIP_RANGE(0.05),
-		UNI_RANGE(10),
-		UNI_RANGE(8),
-		UNI_RANGE(5),
-		UNI_RANGE(2),
-		UNI_RANGE(1),
-		UNI_RANGE(0.5),
-		UNI_RANGE(0.2),
-		UNI_RANGE(0.1)
-	}
-};
-
-static const struct comedi_lrange range_labpc_1200_ai = {
-	14, {
-		BIP_RANGE(5),
-		BIP_RANGE(2.5),
-		BIP_RANGE(1),
-		BIP_RANGE(0.5),
-		BIP_RANGE(0.25),
-		BIP_RANGE(0.1),
-		BIP_RANGE(0.05),
-		UNI_RANGE(10),
-		UNI_RANGE(5),
-		UNI_RANGE(2),
-		UNI_RANGE(1),
-		UNI_RANGE(0.5),
-		UNI_RANGE(0.2),
-		UNI_RANGE(0.1)
-	}
-};
-
-static const struct comedi_lrange range_labpc_ao = {
-	2, {
-		BIP_RANGE(5),
-		UNI_RANGE(10)
-	}
-};
-
-/* functions that do inb/outb and readb/writeb so we can use
- * function pointers to decide which to use */
-static unsigned int labpc_inb(struct comedi_device *dev, unsigned long reg)
-{
-	return inb(dev->iobase + reg);
-}
-
-static void labpc_outb(struct comedi_device *dev,
-		       unsigned int byte, unsigned long reg)
-{
-	outb(byte, dev->iobase + reg);
-}
-
-static unsigned int labpc_readb(struct comedi_device *dev, unsigned long reg)
-{
-	return readb(dev->mmio + reg);
-}
-
-static void labpc_writeb(struct comedi_device *dev,
-			 unsigned int byte, unsigned long reg)
-{
-	writeb(byte, dev->mmio + reg);
-}
-
-#if IS_ENABLED(CONFIG_COMEDI_NI_LABPC_ISA)
 static const struct labpc_boardinfo labpc_boards[] = {
 	{
 		.name			= "lab-pc-1200",
@@ -169,1272 +82,7 @@ static const struct labpc_boardinfo labpc_boards[] = {
 		.has_ao			= 1,
 	},
 };
-#endif
-
-static void labpc_counter_load(struct comedi_device *dev,
-			       unsigned long reg,
-			       unsigned int counter_number,
-			       unsigned int count,
-			       unsigned int mode)
-{
-	if (dev->mmio) {
-		i8254_mm_set_mode(dev->mmio + reg, 0, counter_number, mode);
-		i8254_mm_write(dev->mmio + reg, 0, counter_number, count);
-	} else {
-		i8254_set_mode(dev->iobase + reg, 0, counter_number, mode);
-		i8254_write(dev->iobase + reg, 0, counter_number, count);
-	}
-}
-
-static void labpc_counter_set_mode(struct comedi_device *dev,
-				   unsigned long reg,
-				   unsigned int counter_number,
-				   unsigned int mode)
-{
-	if (dev->mmio)
-		i8254_mm_set_mode(dev->mmio + reg, 0, counter_number, mode);
-	else
-		i8254_set_mode(dev->iobase + reg, 0, counter_number, mode);
-}
-
-static int labpc_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
-{
-	struct labpc_private *devpriv = dev->private;
-	unsigned long flags;
-
-	spin_lock_irqsave(&dev->spinlock, flags);
-	devpriv->cmd2 &= ~(CMD2_SWTRIG | CMD2_HWTRIG | CMD2_PRETRIG);
-	devpriv->write_byte(dev, devpriv->cmd2, CMD2_REG);
-	spin_unlock_irqrestore(&dev->spinlock, flags);
-
-	devpriv->cmd3 = 0;
-	devpriv->write_byte(dev, devpriv->cmd3, CMD3_REG);
-
-	return 0;
-}
-
-static void labpc_ai_set_chan_and_gain(struct comedi_device *dev,
-				       enum scan_mode mode,
-				       unsigned int chan,
-				       unsigned int range,
-				       unsigned int aref)
-{
-	const struct labpc_boardinfo *board = comedi_board(dev);
-	struct labpc_private *devpriv = dev->private;
-
-	if (board->is_labpc1200) {
-		/*
-		 * The LabPC-1200 boards do not have a gain
-		 * of '0x10'. Skip the range values that would
-		 * result in this gain.
-		 */
-		range += (range > 0) + (range > 7);
-	}
-
-	/* munge channel bits for differential/scan disabled mode */
-	if ((mode == MODE_SINGLE_CHAN || mode == MODE_SINGLE_CHAN_INTERVAL) &&
-	    aref == AREF_DIFF)
-		chan *= 2;
-	devpriv->cmd1 = CMD1_MA(chan);
-	devpriv->cmd1 |= CMD1_GAIN(range);
-
-	devpriv->write_byte(dev, devpriv->cmd1, CMD1_REG);
-}
-
-static void labpc_setup_cmd6_reg(struct comedi_device *dev,
-				 struct comedi_subdevice *s,
-				 enum scan_mode mode,
-				 enum transfer_type xfer,
-				 unsigned int range,
-				 unsigned int aref,
-				 bool ena_intr)
-{
-	const struct labpc_boardinfo *board = comedi_board(dev);
-	struct labpc_private *devpriv = dev->private;
-
-	if (!board->is_labpc1200)
-		return;
-
-	/* reference inputs to ground or common? */
-	if (aref != AREF_GROUND)
-		devpriv->cmd6 |= CMD6_NRSE;
-	else
-		devpriv->cmd6 &= ~CMD6_NRSE;
-
-	/* bipolar or unipolar range? */
-	if (comedi_range_is_unipolar(s, range))
-		devpriv->cmd6 |= CMD6_ADCUNI;
-	else
-		devpriv->cmd6 &= ~CMD6_ADCUNI;
-
-	/*  interrupt on fifo half full? */
-	if (xfer == fifo_half_full_transfer)
-		devpriv->cmd6 |= CMD6_HFINTEN;
-	else
-		devpriv->cmd6 &= ~CMD6_HFINTEN;
-
-	/* enable interrupt on counter a1 terminal count? */
-	if (ena_intr)
-		devpriv->cmd6 |= CMD6_DQINTEN;
-	else
-		devpriv->cmd6 &= ~CMD6_DQINTEN;
-
-	/* are we scanning up or down through channels? */
-	if (mode == MODE_MULT_CHAN_UP)
-		devpriv->cmd6 |= CMD6_SCANUP;
-	else
-		devpriv->cmd6 &= ~CMD6_SCANUP;
-
-	devpriv->write_byte(dev, devpriv->cmd6, CMD6_REG);
-}
-
-static unsigned int labpc_read_adc_fifo(struct comedi_device *dev)
-{
-	struct labpc_private *devpriv = dev->private;
-	unsigned int lsb = devpriv->read_byte(dev, ADC_FIFO_REG);
-	unsigned int msb = devpriv->read_byte(dev, ADC_FIFO_REG);
-
-	return (msb << 8) | lsb;
-}
-
-static void labpc_clear_adc_fifo(struct comedi_device *dev)
-{
-	struct labpc_private *devpriv = dev->private;
-
-	devpriv->write_byte(dev, 0x1, ADC_FIFO_CLEAR_REG);
-	labpc_read_adc_fifo(dev);
-}
-
-static int labpc_ai_eoc(struct comedi_device *dev,
-			struct comedi_subdevice *s,
-			struct comedi_insn *insn,
-			unsigned long context)
-{
-	struct labpc_private *devpriv = dev->private;
-
-	devpriv->stat1 = devpriv->read_byte(dev, STAT1_REG);
-	if (devpriv->stat1 & STAT1_DAVAIL)
-		return 0;
-	return -EBUSY;
-}
-
-static int labpc_ai_insn_read(struct comedi_device *dev,
-			      struct comedi_subdevice *s,
-			      struct comedi_insn *insn,
-			      unsigned int *data)
-{
-	struct labpc_private *devpriv = dev->private;
-	unsigned int chan = CR_CHAN(insn->chanspec);
-	unsigned int range = CR_RANGE(insn->chanspec);
-	unsigned int aref = CR_AREF(insn->chanspec);
-	int ret;
-	int i;
-
-	/* disable timed conversions, interrupt generation and dma */
-	labpc_cancel(dev, s);
-
-	labpc_ai_set_chan_and_gain(dev, MODE_SINGLE_CHAN, chan, range, aref);
-
-	labpc_setup_cmd6_reg(dev, s, MODE_SINGLE_CHAN, fifo_not_empty_transfer,
-			     range, aref, false);
-
-	/* setup cmd4 register */
-	devpriv->cmd4 = 0;
-	devpriv->cmd4 |= CMD4_ECLKRCV;
-	/* single-ended/differential */
-	if (aref == AREF_DIFF)
-		devpriv->cmd4 |= CMD4_SEDIFF;
-	devpriv->write_byte(dev, devpriv->cmd4, CMD4_REG);
-
-	/* initialize pacer counter to prevent any problems */
-	labpc_counter_set_mode(dev, COUNTER_A_BASE_REG, 0, I8254_MODE2);
-
-	labpc_clear_adc_fifo(dev);
-
-	for (i = 0; i < insn->n; i++) {
-		/* trigger conversion */
-		devpriv->write_byte(dev, 0x1, ADC_START_CONVERT_REG);
-
-		ret = comedi_timeout(dev, s, insn, labpc_ai_eoc, 0);
-		if (ret)
-			return ret;
-
-		data[i] = labpc_read_adc_fifo(dev);
-	}
-
-	return insn->n;
-}
-
-static bool labpc_use_continuous_mode(const struct comedi_cmd *cmd,
-				      enum scan_mode mode)
-{
-	if (mode == MODE_SINGLE_CHAN || cmd->scan_begin_src == TRIG_FOLLOW)
-		return true;
-
-	return false;
-}
-
-static unsigned int labpc_ai_convert_period(const struct comedi_cmd *cmd,
-					    enum scan_mode mode)
-{
-	if (cmd->convert_src != TRIG_TIMER)
-		return 0;
-
-	if (mode == MODE_SINGLE_CHAN && cmd->scan_begin_src == TRIG_TIMER)
-		return cmd->scan_begin_arg;
-
-	return cmd->convert_arg;
-}
-
-static void labpc_set_ai_convert_period(struct comedi_cmd *cmd,
-					enum scan_mode mode, unsigned int ns)
-{
-	if (cmd->convert_src != TRIG_TIMER)
-		return;
-
-	if (mode == MODE_SINGLE_CHAN &&
-	    cmd->scan_begin_src == TRIG_TIMER) {
-		cmd->scan_begin_arg = ns;
-		if (cmd->convert_arg > cmd->scan_begin_arg)
-			cmd->convert_arg = cmd->scan_begin_arg;
-	} else {
-		cmd->convert_arg = ns;
-	}
-}
-
-static unsigned int labpc_ai_scan_period(const struct comedi_cmd *cmd,
-					 enum scan_mode mode)
-{
-	if (cmd->scan_begin_src != TRIG_TIMER)
-		return 0;
-
-	if (mode == MODE_SINGLE_CHAN && cmd->convert_src == TRIG_TIMER)
-		return 0;
-
-	return cmd->scan_begin_arg;
-}
-
-static void labpc_set_ai_scan_period(struct comedi_cmd *cmd,
-				     enum scan_mode mode, unsigned int ns)
-{
-	if (cmd->scan_begin_src != TRIG_TIMER)
-		return;
-
-	if (mode == MODE_SINGLE_CHAN && cmd->convert_src == TRIG_TIMER)
-		return;
-
-	cmd->scan_begin_arg = ns;
-}
-
-/* figures out what counter values to use based on command */
-static void labpc_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd,
-			     enum scan_mode mode)
-{
-	struct labpc_private *devpriv = dev->private;
-	/* max value for 16 bit counter in mode 2 */
-	const int max_counter_value = 0x10000;
-	/* min value for 16 bit counter in mode 2 */
-	const int min_counter_value = 2;
-	unsigned int base_period;
-	unsigned int scan_period;
-	unsigned int convert_period;
-
-	/*
-	 * if both convert and scan triggers are TRIG_TIMER, then they
-	 * both rely on counter b0
-	 */
-	convert_period = labpc_ai_convert_period(cmd, mode);
-	scan_period = labpc_ai_scan_period(cmd, mode);
-	if (convert_period && scan_period) {
-		/*
-		 * pick the lowest b0 divisor value we can (for maximum input
-		 * clock speed on convert and scan counters)
-		 */
-		devpriv->divisor_b0 = (scan_period - 1) /
-		    (I8254_OSC_BASE_2MHZ * max_counter_value) + 1;
-		if (devpriv->divisor_b0 < min_counter_value)
-			devpriv->divisor_b0 = min_counter_value;
-		if (devpriv->divisor_b0 > max_counter_value)
-			devpriv->divisor_b0 = max_counter_value;
-
-		base_period = I8254_OSC_BASE_2MHZ * devpriv->divisor_b0;
-
-		/*  set a0 for conversion frequency and b1 for scan frequency */
-		switch (cmd->flags & TRIG_ROUND_MASK) {
-		default:
-		case TRIG_ROUND_NEAREST:
-			devpriv->divisor_a0 =
-			    (convert_period + (base_period / 2)) / base_period;
-			devpriv->divisor_b1 =
-			    (scan_period + (base_period / 2)) / base_period;
-			break;
-		case TRIG_ROUND_UP:
-			devpriv->divisor_a0 =
-			    (convert_period + (base_period - 1)) / base_period;
-			devpriv->divisor_b1 =
-			    (scan_period + (base_period - 1)) / base_period;
-			break;
-		case TRIG_ROUND_DOWN:
-			devpriv->divisor_a0 = convert_period / base_period;
-			devpriv->divisor_b1 = scan_period / base_period;
-			break;
-		}
-		/*  make sure a0 and b1 values are acceptable */
-		if (devpriv->divisor_a0 < min_counter_value)
-			devpriv->divisor_a0 = min_counter_value;
-		if (devpriv->divisor_a0 > max_counter_value)
-			devpriv->divisor_a0 = max_counter_value;
-		if (devpriv->divisor_b1 < min_counter_value)
-			devpriv->divisor_b1 = min_counter_value;
-		if (devpriv->divisor_b1 > max_counter_value)
-			devpriv->divisor_b1 = max_counter_value;
-		/*  write corrected timings to command */
-		labpc_set_ai_convert_period(cmd, mode,
-					    base_period * devpriv->divisor_a0);
-		labpc_set_ai_scan_period(cmd, mode,
-					 base_period * devpriv->divisor_b1);
-		/*
-		 * if only one TRIG_TIMER is used, we can employ the generic
-		 * cascaded timing functions
-		 */
-	} else if (scan_period) {
-		/*
-		 * calculate cascaded counter values
-		 * that give desired scan timing
-		 */
-		i8253_cascade_ns_to_timer(I8254_OSC_BASE_2MHZ,
-					  &devpriv->divisor_b1,
-					  &devpriv->divisor_b0,
-					  &scan_period, cmd->flags);
-		labpc_set_ai_scan_period(cmd, mode, scan_period);
-	} else if (convert_period) {
-		/*
-		 * calculate cascaded counter values
-		 * that give desired conversion timing
-		 */
-		i8253_cascade_ns_to_timer(I8254_OSC_BASE_2MHZ,
-					  &devpriv->divisor_a0,
-					  &devpriv->divisor_b0,
-					  &convert_period, cmd->flags);
-		labpc_set_ai_convert_period(cmd, mode, convert_period);
-	}
-}
-
-static enum scan_mode labpc_ai_scan_mode(const struct comedi_cmd *cmd)
-{
-	unsigned int chan0;
-	unsigned int chan1;
-
-	if (cmd->chanlist_len == 1)
-		return MODE_SINGLE_CHAN;
-
-	/* chanlist may be NULL during cmdtest */
-	if (cmd->chanlist == NULL)
-		return MODE_MULT_CHAN_UP;
-
-	chan0 = CR_CHAN(cmd->chanlist[0]);
-	chan1 = CR_CHAN(cmd->chanlist[1]);
-
-	if (chan0 < chan1)
-		return MODE_MULT_CHAN_UP;
-
-	if (chan0 > chan1)
-		return MODE_MULT_CHAN_DOWN;
-
-	return MODE_SINGLE_CHAN_INTERVAL;
-}
-
-static int labpc_ai_check_chanlist(struct comedi_device *dev,
-				   struct comedi_subdevice *s,
-				   struct comedi_cmd *cmd)
-{
-	enum scan_mode mode = labpc_ai_scan_mode(cmd);
-	unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);
-	unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
-	unsigned int aref0 = CR_AREF(cmd->chanlist[0]);
-	int i;
-
-	if (mode == MODE_SINGLE_CHAN)
-		return 0;
-
-	for (i = 0; i < cmd->chanlist_len; i++) {
-		unsigned int chan = CR_CHAN(cmd->chanlist[i]);
-		unsigned int range = CR_RANGE(cmd->chanlist[i]);
-		unsigned int aref = CR_AREF(cmd->chanlist[i]);
-
-		switch (mode) {
-		case MODE_SINGLE_CHAN:
-			break;
-		case MODE_SINGLE_CHAN_INTERVAL:
-			if (chan != chan0) {
-				dev_dbg(dev->class_dev,
-					"channel scanning order specified in chanlist is not supported by hardware\n");
-				return -EINVAL;
-			}
-			break;
-		case MODE_MULT_CHAN_UP:
-			if (chan != i) {
-				dev_dbg(dev->class_dev,
-					"channel scanning order specified in chanlist is not supported by hardware\n");
-				return -EINVAL;
-			}
-			break;
-		case MODE_MULT_CHAN_DOWN:
-			if (chan != (cmd->chanlist_len - i - 1)) {
-				dev_dbg(dev->class_dev,
-					"channel scanning order specified in chanlist is not supported by hardware\n");
-				return -EINVAL;
-			}
-			break;
-		}
-
-		if (range != range0) {
-			dev_dbg(dev->class_dev,
-				"entries in chanlist must all have the same range\n");
-			return -EINVAL;
-		}
-
-		if (aref != aref0) {
-			dev_dbg(dev->class_dev,
-				"entries in chanlist must all have the same reference\n");
-			return -EINVAL;
-		}
-	}
-
-	return 0;
-}
-
-static int labpc_ai_cmdtest(struct comedi_device *dev,
-			    struct comedi_subdevice *s, struct comedi_cmd *cmd)
-{
-	const struct labpc_boardinfo *board = comedi_board(dev);
-	int err = 0;
-	int tmp, tmp2;
-	unsigned int stop_mask;
-	enum scan_mode mode;
-
-	/* Step 1 : check if triggers are trivially valid */
-
-	err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT);
-	err |= cfc_check_trigger_src(&cmd->scan_begin_src,
-					TRIG_TIMER | TRIG_FOLLOW | TRIG_EXT);
-	err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER | TRIG_EXT);
-	err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
-
-	stop_mask = TRIG_COUNT | TRIG_NONE;
-	if (board->is_labpc1200)
-		stop_mask |= TRIG_EXT;
-	err |= cfc_check_trigger_src(&cmd->stop_src, stop_mask);
-
-	if (err)
-		return 1;
-
-	/* Step 2a : make sure trigger sources are unique */
-
-	err |= cfc_check_trigger_is_unique(cmd->start_src);
-	err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
-	err |= cfc_check_trigger_is_unique(cmd->convert_src);
-	err |= cfc_check_trigger_is_unique(cmd->stop_src);
-
-	/* Step 2b : and mutually compatible */
-
-	/* can't have external stop and start triggers at once */
-	if (cmd->start_src == TRIG_EXT && cmd->stop_src == TRIG_EXT)
-		err++;
-
-	if (err)
-		return 2;
-
-	/* Step 3: check if arguments are trivially valid */
-
-	switch (cmd->start_src) {
-	case TRIG_NOW:
-		err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
-		break;
-	case TRIG_EXT:
-		/* start_arg value is ignored */
-		break;
-	}
-
-	if (!cmd->chanlist_len)
-		err |= -EINVAL;
-	err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
-
-	if (cmd->convert_src == TRIG_TIMER)
-		err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
-						 board->ai_speed);
-
-	/* make sure scan timing is not too fast */
-	if (cmd->scan_begin_src == TRIG_TIMER) {
-		if (cmd->convert_src == TRIG_TIMER)
-			err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
-					cmd->convert_arg * cmd->chanlist_len);
-		err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
-				board->ai_speed * cmd->chanlist_len);
-	}
-
-	switch (cmd->stop_src) {
-	case TRIG_COUNT:
-		err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
-		break;
-	case TRIG_NONE:
-		err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
-		break;
-		/*
-		 * TRIG_EXT doesn't care since it doesn't
-		 * trigger off a numbered channel
-		 */
-	default:
-		break;
-	}
-
-	if (err)
-		return 3;
-
-	/* step 4: fix up any arguments */
-
-	tmp = cmd->convert_arg;
-	tmp2 = cmd->scan_begin_arg;
-	mode = labpc_ai_scan_mode(cmd);
-	labpc_adc_timing(dev, cmd, mode);
-	if (tmp != cmd->convert_arg || tmp2 != cmd->scan_begin_arg)
-		err++;
-
-	if (err)
-		return 4;
-
-	/* Step 5: check channel list if it exists */
-	if (cmd->chanlist && cmd->chanlist_len > 0)
-		err |= labpc_ai_check_chanlist(dev, s, cmd);
-
-	if (err)
-		return 5;
-
-	return 0;
-}
-
-static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
-{
-	const struct labpc_boardinfo *board = comedi_board(dev);
-	struct labpc_private *devpriv = dev->private;
-	struct comedi_async *async = s->async;
-	struct comedi_cmd *cmd = &async->cmd;
-	enum scan_mode mode = labpc_ai_scan_mode(cmd);
-	unsigned int chanspec = (mode == MODE_MULT_CHAN_UP) ?
-				cmd->chanlist[cmd->chanlist_len - 1] :
-				cmd->chanlist[0];
-	unsigned int chan = CR_CHAN(chanspec);
-	unsigned int range = CR_RANGE(chanspec);
-	unsigned int aref = CR_AREF(chanspec);
-	enum transfer_type xfer;
-	unsigned long flags;
-
-	/* make sure board is disabled before setting up acquisition */
-	labpc_cancel(dev, s);
-
-	/*  initialize software conversion count */
-	if (cmd->stop_src == TRIG_COUNT)
-		devpriv->count = cmd->stop_arg * cmd->chanlist_len;
-
-	/*  setup hardware conversion counter */
-	if (cmd->stop_src == TRIG_EXT) {
-		/*
-		 * load counter a1 with count of 3
-		 * (pc+ manual says this is minimum allowed) using mode 0
-		 */
-		labpc_counter_load(dev, COUNTER_A_BASE_REG,
-				   1, 3, I8254_MODE0);
-	} else	{
-		/* just put counter a1 in mode 0 to set its output low */
-		labpc_counter_set_mode(dev, COUNTER_A_BASE_REG, 1, I8254_MODE0);
-	}
 
-	/* figure out what method we will use to transfer data */
-	if (labpc_have_dma_chan(dev) &&
-	    /* dma unsafe at RT priority,
-	     * and too much setup time for TRIG_WAKE_EOS */
-	    (cmd->flags & (TRIG_WAKE_EOS | TRIG_RT)) == 0)
-		xfer = isa_dma_transfer;
-	else if (/* pc-plus has no fifo-half full interrupt */
-		 board->is_labpc1200 &&
-		 /* wake-end-of-scan should interrupt on fifo not empty */
-		 (cmd->flags & TRIG_WAKE_EOS) == 0 &&
-		 /* make sure we are taking more than just a few points */
-		 (cmd->stop_src != TRIG_COUNT || devpriv->count > 256))
-		xfer = fifo_half_full_transfer;
-	else
-		xfer = fifo_not_empty_transfer;
-	devpriv->current_transfer = xfer;
-
-	labpc_ai_set_chan_and_gain(dev, mode, chan, range, aref);
-
-	labpc_setup_cmd6_reg(dev, s, mode, xfer, range, aref,
-			     (cmd->stop_src == TRIG_EXT));
-
-	/* manual says to set scan enable bit on second pass */
-	if (mode == MODE_MULT_CHAN_UP || mode == MODE_MULT_CHAN_DOWN) {
-		devpriv->cmd1 |= CMD1_SCANEN;
-		/* need a brief delay before enabling scan, or scan
-		 * list will get screwed when you switch
-		 * between scan up to scan down mode - dunno why */
-		udelay(1);
-		devpriv->write_byte(dev, devpriv->cmd1, CMD1_REG);
-	}
-
-	devpriv->write_byte(dev, cmd->chanlist_len, INTERVAL_COUNT_REG);
-	/*  load count */
-	devpriv->write_byte(dev, 0x1, INTERVAL_STROBE_REG);
-
-	if (cmd->convert_src == TRIG_TIMER ||
-	    cmd->scan_begin_src == TRIG_TIMER) {
-		/*  set up pacing */
-		labpc_adc_timing(dev, cmd, mode);
-		/*  load counter b0 in mode 3 */
-		labpc_counter_load(dev, COUNTER_B_BASE_REG,
-				   0, devpriv->divisor_b0, I8254_MODE3);
-	}
-	/*  set up conversion pacing */
-	if (labpc_ai_convert_period(cmd, mode)) {
-		/*  load counter a0 in mode 2 */
-		labpc_counter_load(dev, COUNTER_A_BASE_REG,
-				   0, devpriv->divisor_a0, I8254_MODE2);
-	} else {
-		/* initialize pacer counter to prevent any problems */
-		labpc_counter_set_mode(dev, COUNTER_A_BASE_REG, 0, I8254_MODE2);
-	}
-
-	/*  set up scan pacing */
-	if (labpc_ai_scan_period(cmd, mode)) {
-		/*  load counter b1 in mode 2 */
-		labpc_counter_load(dev, COUNTER_B_BASE_REG,
-				   1, devpriv->divisor_b1, I8254_MODE2);
-	}
-
-	labpc_clear_adc_fifo(dev);
-
-	if (xfer == isa_dma_transfer)
-		labpc_setup_dma(dev, s);
-
-	/*  enable error interrupts */
-	devpriv->cmd3 |= CMD3_ERRINTEN;
-	/*  enable fifo not empty interrupt? */
-	if (xfer == fifo_not_empty_transfer)
-		devpriv->cmd3 |= CMD3_FIFOINTEN;
-	devpriv->write_byte(dev, devpriv->cmd3, CMD3_REG);
-
-	/*  setup any external triggering/pacing (cmd4 register) */
-	devpriv->cmd4 = 0;
-	if (cmd->convert_src != TRIG_EXT)
-		devpriv->cmd4 |= CMD4_ECLKRCV;
-	/* XXX should discard first scan when using interval scanning
-	 * since manual says it is not synced with scan clock */
-	if (!labpc_use_continuous_mode(cmd, mode)) {
-		devpriv->cmd4 |= CMD4_INTSCAN;
-		if (cmd->scan_begin_src == TRIG_EXT)
-			devpriv->cmd4 |= CMD4_EOIRCV;
-	}
-	/*  single-ended/differential */
-	if (aref == AREF_DIFF)
-		devpriv->cmd4 |= CMD4_SEDIFF;
-	devpriv->write_byte(dev, devpriv->cmd4, CMD4_REG);
-
-	/*  startup acquisition */
-
-	spin_lock_irqsave(&dev->spinlock, flags);
-
-	/* use 2 cascaded counters for pacing */
-	devpriv->cmd2 |= CMD2_TBSEL;
-
-	devpriv->cmd2 &= ~(CMD2_SWTRIG | CMD2_HWTRIG | CMD2_PRETRIG);
-	if (cmd->start_src == TRIG_EXT)
-		devpriv->cmd2 |= CMD2_HWTRIG;
-	else
-		devpriv->cmd2 |= CMD2_SWTRIG;
-	if (cmd->stop_src == TRIG_EXT)
-		devpriv->cmd2 |= (CMD2_HWTRIG | CMD2_PRETRIG);
-
-	devpriv->write_byte(dev, devpriv->cmd2, CMD2_REG);
-
-	spin_unlock_irqrestore(&dev->spinlock, flags);
-
-	return 0;
-}
-
-/* read all available samples from ai fifo */
-static int labpc_drain_fifo(struct comedi_device *dev)
-{
-	struct labpc_private *devpriv = dev->private;
-	struct comedi_async *async = dev->read_subdev->async;
-	struct comedi_cmd *cmd = &async->cmd;
-	unsigned short data;
-	const int timeout = 10000;
-	unsigned int i;
-
-	devpriv->stat1 = devpriv->read_byte(dev, STAT1_REG);
-
-	for (i = 0; (devpriv->stat1 & STAT1_DAVAIL) && i < timeout;
-	     i++) {
-		/*  quit if we have all the data we want */
-		if (cmd->stop_src == TRIG_COUNT) {
-			if (devpriv->count == 0)
-				break;
-			devpriv->count--;
-		}
-		data = labpc_read_adc_fifo(dev);
-		cfc_write_to_buffer(dev->read_subdev, data);
-		devpriv->stat1 = devpriv->read_byte(dev, STAT1_REG);
-	}
-	if (i == timeout) {
-		dev_err(dev->class_dev, "ai timeout, fifo never empties\n");
-		async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
-		return -1;
-	}
-
-	return 0;
-}
-
-/* makes sure all data acquired by board is transferred to comedi (used
- * when acquisition is terminated by stop_src == TRIG_EXT). */
-static void labpc_drain_dregs(struct comedi_device *dev)
-{
-	struct labpc_private *devpriv = dev->private;
-
-	if (devpriv->current_transfer == isa_dma_transfer)
-		labpc_drain_dma(dev);
-
-	labpc_drain_fifo(dev);
-}
-
-/* interrupt service routine */
-static irqreturn_t labpc_interrupt(int irq, void *d)
-{
-	struct comedi_device *dev = d;
-	const struct labpc_boardinfo *board = comedi_board(dev);
-	struct labpc_private *devpriv = dev->private;
-	struct comedi_subdevice *s = dev->read_subdev;
-	struct comedi_async *async;
-	struct comedi_cmd *cmd;
-
-	if (!dev->attached) {
-		dev_err(dev->class_dev, "premature interrupt\n");
-		return IRQ_HANDLED;
-	}
-
-	async = s->async;
-	cmd = &async->cmd;
-
-	/* read board status */
-	devpriv->stat1 = devpriv->read_byte(dev, STAT1_REG);
-	if (board->is_labpc1200)
-		devpriv->stat2 = devpriv->read_byte(dev, STAT2_REG);
-
-	if ((devpriv->stat1 & (STAT1_GATA0 | STAT1_CNTINT | STAT1_OVERFLOW |
-			       STAT1_OVERRUN | STAT1_DAVAIL)) == 0 &&
-	    (devpriv->stat2 & STAT2_OUTA1) == 0 &&
-	    (devpriv->stat2 & STAT2_FIFONHF)) {
-		return IRQ_NONE;
-	}
-
-	if (devpriv->stat1 & STAT1_OVERRUN) {
-		/* clear error interrupt */
-		devpriv->write_byte(dev, 0x1, ADC_FIFO_CLEAR_REG);
-		async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
-		cfc_handle_events(dev, s);
-		dev_err(dev->class_dev, "overrun\n");
-		return IRQ_HANDLED;
-	}
-
-	if (devpriv->current_transfer == isa_dma_transfer)
-		labpc_handle_dma_status(dev);
-	else
-		labpc_drain_fifo(dev);
-
-	if (devpriv->stat1 & STAT1_CNTINT) {
-		dev_err(dev->class_dev, "handled timer interrupt?\n");
-		/*  clear it */
-		devpriv->write_byte(dev, 0x1, TIMER_CLEAR_REG);
-	}
-
-	if (devpriv->stat1 & STAT1_OVERFLOW) {
-		/*  clear error interrupt */
-		devpriv->write_byte(dev, 0x1, ADC_FIFO_CLEAR_REG);
-		async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
-		cfc_handle_events(dev, s);
-		dev_err(dev->class_dev, "overflow\n");
-		return IRQ_HANDLED;
-	}
-	/*  handle external stop trigger */
-	if (cmd->stop_src == TRIG_EXT) {
-		if (devpriv->stat2 & STAT2_OUTA1) {
-			labpc_drain_dregs(dev);
-			async->events |= COMEDI_CB_EOA;
-		}
-	}
-
-	/* TRIG_COUNT end of acquisition */
-	if (cmd->stop_src == TRIG_COUNT) {
-		if (devpriv->count == 0)
-			async->events |= COMEDI_CB_EOA;
-	}
-
-	cfc_handle_events(dev, s);
-	return IRQ_HANDLED;
-}
-
-static int labpc_ao_insn_write(struct comedi_device *dev,
-			       struct comedi_subdevice *s,
-			       struct comedi_insn *insn,
-			       unsigned int *data)
-{
-	const struct labpc_boardinfo *board = comedi_board(dev);
-	struct labpc_private *devpriv = dev->private;
-	int channel, range;
-	unsigned long flags;
-	int lsb, msb;
-
-	channel = CR_CHAN(insn->chanspec);
-
-	/* turn off pacing of analog output channel */
-	/* note: hardware bug in daqcard-1200 means pacing cannot
-	 * be independently enabled/disabled for its the two channels */
-	spin_lock_irqsave(&dev->spinlock, flags);
-	devpriv->cmd2 &= ~CMD2_LDAC(channel);
-	devpriv->write_byte(dev, devpriv->cmd2, CMD2_REG);
-	spin_unlock_irqrestore(&dev->spinlock, flags);
-
-	/* set range */
-	if (board->is_labpc1200) {
-		range = CR_RANGE(insn->chanspec);
-		if (comedi_range_is_unipolar(s, range))
-			devpriv->cmd6 |= CMD6_DACUNI(channel);
-		else
-			devpriv->cmd6 &= ~CMD6_DACUNI(channel);
-		/*  write to register */
-		devpriv->write_byte(dev, devpriv->cmd6, CMD6_REG);
-	}
-	/* send data */
-	lsb = data[0] & 0xff;
-	msb = (data[0] >> 8) & 0xff;
-	devpriv->write_byte(dev, lsb, DAC_LSB_REG(channel));
-	devpriv->write_byte(dev, msb, DAC_MSB_REG(channel));
-
-	/* remember value for readback */
-	devpriv->ao_value[channel] = data[0];
-
-	return 1;
-}
-
-static int labpc_ao_insn_read(struct comedi_device *dev,
-			      struct comedi_subdevice *s,
-			      struct comedi_insn *insn,
-			      unsigned int *data)
-{
-	struct labpc_private *devpriv = dev->private;
-
-	data[0] = devpriv->ao_value[CR_CHAN(insn->chanspec)];
-
-	return 1;
-}
-
-/* lowlevel write to eeprom/dac */
-static void labpc_serial_out(struct comedi_device *dev, unsigned int value,
-			     unsigned int value_width)
-{
-	struct labpc_private *devpriv = dev->private;
-	int i;
-
-	for (i = 1; i <= value_width; i++) {
-		/*  clear serial clock */
-		devpriv->cmd5 &= ~CMD5_SCLK;
-		/*  send bits most significant bit first */
-		if (value & (1 << (value_width - i)))
-			devpriv->cmd5 |= CMD5_SDATA;
-		else
-			devpriv->cmd5 &= ~CMD5_SDATA;
-		udelay(1);
-		devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-		/*  set clock to load bit */
-		devpriv->cmd5 |= CMD5_SCLK;
-		udelay(1);
-		devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-	}
-}
-
-/* lowlevel read from eeprom */
-static unsigned int labpc_serial_in(struct comedi_device *dev)
-{
-	struct labpc_private *devpriv = dev->private;
-	unsigned int value = 0;
-	int i;
-	const int value_width = 8;	/*  number of bits wide values are */
-
-	for (i = 1; i <= value_width; i++) {
-		/*  set serial clock */
-		devpriv->cmd5 |= CMD5_SCLK;
-		udelay(1);
-		devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-		/*  clear clock bit */
-		devpriv->cmd5 &= ~CMD5_SCLK;
-		udelay(1);
-		devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-		/*  read bits most significant bit first */
-		udelay(1);
-		devpriv->stat2 = devpriv->read_byte(dev, STAT2_REG);
-		if (devpriv->stat2 & STAT2_PROMOUT)
-			value |= 1 << (value_width - i);
-	}
-
-	return value;
-}
-
-static unsigned int labpc_eeprom_read(struct comedi_device *dev,
-				      unsigned int address)
-{
-	struct labpc_private *devpriv = dev->private;
-	unsigned int value;
-	/*  bits to tell eeprom to expect a read */
-	const int read_instruction = 0x3;
-	/*  8 bit write lengths to eeprom */
-	const int write_length = 8;
-
-	/*  enable read/write to eeprom */
-	devpriv->cmd5 &= ~CMD5_EEPROMCS;
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-	devpriv->cmd5 |= (CMD5_EEPROMCS | CMD5_WRTPRT);
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-
-	/*  send read instruction */
-	labpc_serial_out(dev, read_instruction, write_length);
-	/*  send 8 bit address to read from */
-	labpc_serial_out(dev, address, write_length);
-	/*  read result */
-	value = labpc_serial_in(dev);
-
-	/*  disable read/write to eeprom */
-	devpriv->cmd5 &= ~(CMD5_EEPROMCS | CMD5_WRTPRT);
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-
-	return value;
-}
-
-static unsigned int labpc_eeprom_read_status(struct comedi_device *dev)
-{
-	struct labpc_private *devpriv = dev->private;
-	unsigned int value;
-	const int read_status_instruction = 0x5;
-	const int write_length = 8;	/*  8 bit write lengths to eeprom */
-
-	/*  enable read/write to eeprom */
-	devpriv->cmd5 &= ~CMD5_EEPROMCS;
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-	devpriv->cmd5 |= (CMD5_EEPROMCS | CMD5_WRTPRT);
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-
-	/*  send read status instruction */
-	labpc_serial_out(dev, read_status_instruction, write_length);
-	/*  read result */
-	value = labpc_serial_in(dev);
-
-	/*  disable read/write to eeprom */
-	devpriv->cmd5 &= ~(CMD5_EEPROMCS | CMD5_WRTPRT);
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-
-	return value;
-}
-
-static int labpc_eeprom_write(struct comedi_device *dev,
-			      unsigned int address, unsigned int value)
-{
-	struct labpc_private *devpriv = dev->private;
-	const int write_enable_instruction = 0x6;
-	const int write_instruction = 0x2;
-	const int write_length = 8;	/*  8 bit write lengths to eeprom */
-	const int write_in_progress_bit = 0x1;
-	const int timeout = 10000;
-	int i;
-
-	/*  make sure there isn't already a write in progress */
-	for (i = 0; i < timeout; i++) {
-		if ((labpc_eeprom_read_status(dev) & write_in_progress_bit) ==
-		    0)
-			break;
-	}
-	if (i == timeout) {
-		dev_err(dev->class_dev, "eeprom write timed out\n");
-		return -ETIME;
-	}
-	/*  update software copy of eeprom */
-	devpriv->eeprom_data[address] = value;
-
-	/*  enable read/write to eeprom */
-	devpriv->cmd5 &= ~CMD5_EEPROMCS;
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-	devpriv->cmd5 |= (CMD5_EEPROMCS | CMD5_WRTPRT);
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-
-	/*  send write_enable instruction */
-	labpc_serial_out(dev, write_enable_instruction, write_length);
-	devpriv->cmd5 &= ~CMD5_EEPROMCS;
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-
-	/*  send write instruction */
-	devpriv->cmd5 |= CMD5_EEPROMCS;
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-	labpc_serial_out(dev, write_instruction, write_length);
-	/*  send 8 bit address to write to */
-	labpc_serial_out(dev, address, write_length);
-	/*  write value */
-	labpc_serial_out(dev, value, write_length);
-	devpriv->cmd5 &= ~CMD5_EEPROMCS;
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-
-	/*  disable read/write to eeprom */
-	devpriv->cmd5 &= ~(CMD5_EEPROMCS | CMD5_WRTPRT);
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-
-	return 0;
-}
-
-/* writes to 8 bit calibration dacs */
-static void write_caldac(struct comedi_device *dev, unsigned int channel,
-			 unsigned int value)
-{
-	struct labpc_private *devpriv = dev->private;
-
-	if (value == devpriv->caldac[channel])
-		return;
-	devpriv->caldac[channel] = value;
-
-	/*  clear caldac load bit and make sure we don't write to eeprom */
-	devpriv->cmd5 &= ~(CMD5_CALDACLD | CMD5_EEPROMCS | CMD5_WRTPRT);
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-
-	/*  write 4 bit channel */
-	labpc_serial_out(dev, channel, 4);
-	/*  write 8 bit caldac value */
-	labpc_serial_out(dev, value, 8);
-
-	/*  set and clear caldac bit to load caldac value */
-	devpriv->cmd5 |= CMD5_CALDACLD;
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-	devpriv->cmd5 &= ~CMD5_CALDACLD;
-	udelay(1);
-	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-}
-
-static int labpc_calib_insn_write(struct comedi_device *dev,
-				  struct comedi_subdevice *s,
-				  struct comedi_insn *insn,
-				  unsigned int *data)
-{
-	unsigned int chan = CR_CHAN(insn->chanspec);
-
-	/*
-	 * Only write the last data value to the caldac. Preceding
-	 * data would be overwritten anyway.
-	 */
-	if (insn->n > 0)
-		write_caldac(dev, chan, data[insn->n - 1]);
-
-	return insn->n;
-}
-
-static int labpc_calib_insn_read(struct comedi_device *dev,
-				 struct comedi_subdevice *s,
-				 struct comedi_insn *insn,
-				 unsigned int *data)
-{
-	struct labpc_private *devpriv = dev->private;
-	unsigned int chan = CR_CHAN(insn->chanspec);
-	int i;
-
-	for (i = 0; i < insn->n; i++)
-		data[i] = devpriv->caldac[chan];
-
-	return insn->n;
-}
-
-static int labpc_eeprom_insn_write(struct comedi_device *dev,
-				   struct comedi_subdevice *s,
-				   struct comedi_insn *insn,
-				   unsigned int *data)
-{
-	unsigned int chan = CR_CHAN(insn->chanspec);
-	int ret;
-
-	/* only allow writes to user area of eeprom */
-	if (chan < 16 || chan > 127)
-		return -EINVAL;
-
-	/*
-	 * Only write the last data value to the eeprom. Preceding
-	 * data would be overwritten anyway.
-	 */
-	if (insn->n > 0) {
-		ret = labpc_eeprom_write(dev, chan, data[insn->n - 1]);
-		if (ret)
-			return ret;
-	}
-
-	return insn->n;
-}
-
-static int labpc_eeprom_insn_read(struct comedi_device *dev,
-				  struct comedi_subdevice *s,
-				  struct comedi_insn *insn,
-				  unsigned int *data)
-{
-	struct labpc_private *devpriv = dev->private;
-	unsigned int chan = CR_CHAN(insn->chanspec);
-	int i;
-
-	for (i = 0; i < insn->n; i++)
-		data[i] = devpriv->eeprom_data[chan];
-
-	return insn->n;
-}
-
-int labpc_common_attach(struct comedi_device *dev,
-			unsigned int irq, unsigned long isr_flags)
-{
-	const struct labpc_boardinfo *board = comedi_board(dev);
-	struct labpc_private *devpriv = dev->private;
-	struct comedi_subdevice *s;
-	int ret;
-	int i;
-
-	if (dev->mmio) {
-		devpriv->read_byte = labpc_readb;
-		devpriv->write_byte = labpc_writeb;
-	} else {
-		devpriv->read_byte = labpc_inb;
-		devpriv->write_byte = labpc_outb;
-	}
-
-	/* initialize board's command registers */
-	devpriv->write_byte(dev, devpriv->cmd1, CMD1_REG);
-	devpriv->write_byte(dev, devpriv->cmd2, CMD2_REG);
-	devpriv->write_byte(dev, devpriv->cmd3, CMD3_REG);
-	devpriv->write_byte(dev, devpriv->cmd4, CMD4_REG);
-	if (board->is_labpc1200) {
-		devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
-		devpriv->write_byte(dev, devpriv->cmd6, CMD6_REG);
-	}
-
-	if (irq) {
-		ret = request_irq(irq, labpc_interrupt, isr_flags,
-				  dev->board_name, dev);
-		if (ret == 0)
-			dev->irq = irq;
-	}
-
-	ret = comedi_alloc_subdevices(dev, 5);
-	if (ret)
-		return ret;
-
-	/* analog input subdevice */
-	s = &dev->subdevices[0];
-	s->type		= COMEDI_SUBD_AI;
-	s->subdev_flags	= SDF_READABLE | SDF_GROUND | SDF_COMMON | SDF_DIFF;
-	s->n_chan	= 8;
-	s->len_chanlist	= 8;
-	s->maxdata	= 0x0fff;
-	s->range_table	= board->is_labpc1200 ?
-			  &range_labpc_1200_ai : &range_labpc_plus_ai;
-	s->insn_read	= labpc_ai_insn_read;
-	if (dev->irq) {
-		dev->read_subdev = s;
-		s->subdev_flags	|= SDF_CMD_READ;
-		s->do_cmd	= labpc_ai_cmd;
-		s->do_cmdtest	= labpc_ai_cmdtest;
-		s->cancel	= labpc_cancel;
-	}
-
-	/* analog output */
-	s = &dev->subdevices[1];
-	if (board->has_ao) {
-		s->type		= COMEDI_SUBD_AO;
-		s->subdev_flags	= SDF_READABLE | SDF_WRITABLE | SDF_GROUND;
-		s->n_chan	= NUM_AO_CHAN;
-		s->maxdata	= 0x0fff;
-		s->range_table	= &range_labpc_ao;
-		s->insn_read	= labpc_ao_insn_read;
-		s->insn_write	= labpc_ao_insn_write;
-
-		/* initialize analog outputs to a known value */
-		for (i = 0; i < s->n_chan; i++) {
-			short lsb, msb;
-
-			devpriv->ao_value[i] = s->maxdata / 2;
-			lsb = devpriv->ao_value[i] & 0xff;
-			msb = (devpriv->ao_value[i] >> 8) & 0xff;
-			devpriv->write_byte(dev, lsb, DAC_LSB_REG(i));
-			devpriv->write_byte(dev, msb, DAC_MSB_REG(i));
-		}
-	} else {
-		s->type		= COMEDI_SUBD_UNUSED;
-	}
-
-	/* 8255 dio */
-	s = &dev->subdevices[2];
-	if (dev->mmio)
-		ret = subdev_8255_mm_init(dev, s, NULL, DIO_BASE_REG);
-	else
-		ret = subdev_8255_init(dev, s, NULL, DIO_BASE_REG);
-	if (ret)
-		return ret;
-
-	/*  calibration subdevices for boards that have one */
-	s = &dev->subdevices[3];
-	if (board->is_labpc1200) {
-		s->type		= COMEDI_SUBD_CALIB;
-		s->subdev_flags	= SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
-		s->n_chan	= 16;
-		s->maxdata	= 0xff;
-		s->insn_read	= labpc_calib_insn_read;
-		s->insn_write	= labpc_calib_insn_write;
-
-		for (i = 0; i < s->n_chan; i++)
-			write_caldac(dev, i, s->maxdata / 2);
-	} else {
-		s->type		= COMEDI_SUBD_UNUSED;
-	}
-
-	/* EEPROM */
-	s = &dev->subdevices[4];
-	if (board->is_labpc1200) {
-		s->type		= COMEDI_SUBD_MEMORY;
-		s->subdev_flags	= SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
-		s->n_chan	= EEPROM_SIZE;
-		s->maxdata	= 0xff;
-		s->insn_read	= labpc_eeprom_insn_read;
-		s->insn_write	= labpc_eeprom_insn_write;
-
-		for (i = 0; i < s->n_chan; i++)
-			devpriv->eeprom_data[i] = labpc_eeprom_read(dev, i);
-	} else {
-		s->type		= COMEDI_SUBD_UNUSED;
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(labpc_common_attach);
-
-#if IS_ENABLED(CONFIG_COMEDI_NI_LABPC_ISA)
 static int labpc_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 {
 	struct labpc_private *devpriv;
@@ -1480,19 +128,7 @@ static struct comedi_driver labpc_driver = {
 	.offset		= sizeof(struct labpc_boardinfo),
 };
 module_comedi_driver(labpc_driver);
-#else
-static int __init labpc_common_init(void)
-{
-	return 0;
-}
-module_init(labpc_common_init);
-
-static void __exit labpc_common_exit(void)
-{
-}
-module_exit(labpc_common_exit);
-#endif
 
 MODULE_AUTHOR("Comedi http://www.comedi.org";);
-MODULE_DESCRIPTION("Comedi low-level driver");
+MODULE_DESCRIPTION("Comedi driver for NI Lab-PC ISA boards");
 MODULE_LICENSE("GPL");
diff --git a/drivers/staging/comedi/drivers/ni_labpc_common.c b/drivers/staging/comedi/drivers/ni_labpc_common.c
new file mode 100644
index 0000000..9e76a36
--- /dev/null
+++ b/drivers/staging/comedi/drivers/ni_labpc_common.c
@@ -0,0 +1,1387 @@
+/*
+ * comedi/drivers/ni_labpc_common.c
+ *
+ * Common support code for "ni_labpc", "ni_labpc_pci" and "ni_labpc_cs".
+ *
+ * Copyright (C) 2001-2003 Frank Mori Hess <fmhess@xxxxxxxxxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+
+#include "../comedidev.h"
+
+#include "8253.h"
+#include "8255.h"
+#include "comedi_fc.h"
+#include "ni_labpc.h"
+#include "ni_labpc_regs.h"
+#include "ni_labpc_isadma.h"
+
+enum scan_mode {
+	MODE_SINGLE_CHAN,
+	MODE_SINGLE_CHAN_INTERVAL,
+	MODE_MULT_CHAN_UP,
+	MODE_MULT_CHAN_DOWN,
+};
+
+static const struct comedi_lrange range_labpc_plus_ai = {
+	16, {
+		BIP_RANGE(5),
+		BIP_RANGE(4),
+		BIP_RANGE(2.5),
+		BIP_RANGE(1),
+		BIP_RANGE(0.5),
+		BIP_RANGE(0.25),
+		BIP_RANGE(0.1),
+		BIP_RANGE(0.05),
+		UNI_RANGE(10),
+		UNI_RANGE(8),
+		UNI_RANGE(5),
+		UNI_RANGE(2),
+		UNI_RANGE(1),
+		UNI_RANGE(0.5),
+		UNI_RANGE(0.2),
+		UNI_RANGE(0.1)
+	}
+};
+
+static const struct comedi_lrange range_labpc_1200_ai = {
+	14, {
+		BIP_RANGE(5),
+		BIP_RANGE(2.5),
+		BIP_RANGE(1),
+		BIP_RANGE(0.5),
+		BIP_RANGE(0.25),
+		BIP_RANGE(0.1),
+		BIP_RANGE(0.05),
+		UNI_RANGE(10),
+		UNI_RANGE(5),
+		UNI_RANGE(2),
+		UNI_RANGE(1),
+		UNI_RANGE(0.5),
+		UNI_RANGE(0.2),
+		UNI_RANGE(0.1)
+	}
+};
+
+static const struct comedi_lrange range_labpc_ao = {
+	2, {
+		BIP_RANGE(5),
+		UNI_RANGE(10)
+	}
+};
+
+/* functions that do inb/outb and readb/writeb so we can use
+ * function pointers to decide which to use */
+static unsigned int labpc_inb(struct comedi_device *dev, unsigned long reg)
+{
+	return inb(dev->iobase + reg);
+}
+
+static void labpc_outb(struct comedi_device *dev,
+		       unsigned int byte, unsigned long reg)
+{
+	outb(byte, dev->iobase + reg);
+}
+
+static unsigned int labpc_readb(struct comedi_device *dev, unsigned long reg)
+{
+	return readb(dev->mmio + reg);
+}
+
+static void labpc_writeb(struct comedi_device *dev,
+			 unsigned int byte, unsigned long reg)
+{
+	writeb(byte, dev->mmio + reg);
+}
+
+static void labpc_counter_load(struct comedi_device *dev,
+			       unsigned long reg,
+			       unsigned int counter_number,
+			       unsigned int count,
+			       unsigned int mode)
+{
+	if (dev->mmio) {
+		i8254_mm_set_mode(dev->mmio + reg, 0, counter_number, mode);
+		i8254_mm_write(dev->mmio + reg, 0, counter_number, count);
+	} else {
+		i8254_set_mode(dev->iobase + reg, 0, counter_number, mode);
+		i8254_write(dev->iobase + reg, 0, counter_number, count);
+	}
+}
+
+static void labpc_counter_set_mode(struct comedi_device *dev,
+				   unsigned long reg,
+				   unsigned int counter_number,
+				   unsigned int mode)
+{
+	if (dev->mmio)
+		i8254_mm_set_mode(dev->mmio + reg, 0, counter_number, mode);
+	else
+		i8254_set_mode(dev->iobase + reg, 0, counter_number, mode);
+}
+
+static int labpc_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
+{
+	struct labpc_private *devpriv = dev->private;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->spinlock, flags);
+	devpriv->cmd2 &= ~(CMD2_SWTRIG | CMD2_HWTRIG | CMD2_PRETRIG);
+	devpriv->write_byte(dev, devpriv->cmd2, CMD2_REG);
+	spin_unlock_irqrestore(&dev->spinlock, flags);
+
+	devpriv->cmd3 = 0;
+	devpriv->write_byte(dev, devpriv->cmd3, CMD3_REG);
+
+	return 0;
+}
+
+static void labpc_ai_set_chan_and_gain(struct comedi_device *dev,
+				       enum scan_mode mode,
+				       unsigned int chan,
+				       unsigned int range,
+				       unsigned int aref)
+{
+	const struct labpc_boardinfo *board = comedi_board(dev);
+	struct labpc_private *devpriv = dev->private;
+
+	if (board->is_labpc1200) {
+		/*
+		 * The LabPC-1200 boards do not have a gain
+		 * of '0x10'. Skip the range values that would
+		 * result in this gain.
+		 */
+		range += (range > 0) + (range > 7);
+	}
+
+	/* munge channel bits for differential/scan disabled mode */
+	if ((mode == MODE_SINGLE_CHAN || mode == MODE_SINGLE_CHAN_INTERVAL) &&
+	    aref == AREF_DIFF)
+		chan *= 2;
+	devpriv->cmd1 = CMD1_MA(chan);
+	devpriv->cmd1 |= CMD1_GAIN(range);
+
+	devpriv->write_byte(dev, devpriv->cmd1, CMD1_REG);
+}
+
+static void labpc_setup_cmd6_reg(struct comedi_device *dev,
+				 struct comedi_subdevice *s,
+				 enum scan_mode mode,
+				 enum transfer_type xfer,
+				 unsigned int range,
+				 unsigned int aref,
+				 bool ena_intr)
+{
+	const struct labpc_boardinfo *board = comedi_board(dev);
+	struct labpc_private *devpriv = dev->private;
+
+	if (!board->is_labpc1200)
+		return;
+
+	/* reference inputs to ground or common? */
+	if (aref != AREF_GROUND)
+		devpriv->cmd6 |= CMD6_NRSE;
+	else
+		devpriv->cmd6 &= ~CMD6_NRSE;
+
+	/* bipolar or unipolar range? */
+	if (comedi_range_is_unipolar(s, range))
+		devpriv->cmd6 |= CMD6_ADCUNI;
+	else
+		devpriv->cmd6 &= ~CMD6_ADCUNI;
+
+	/*  interrupt on fifo half full? */
+	if (xfer == fifo_half_full_transfer)
+		devpriv->cmd6 |= CMD6_HFINTEN;
+	else
+		devpriv->cmd6 &= ~CMD6_HFINTEN;
+
+	/* enable interrupt on counter a1 terminal count? */
+	if (ena_intr)
+		devpriv->cmd6 |= CMD6_DQINTEN;
+	else
+		devpriv->cmd6 &= ~CMD6_DQINTEN;
+
+	/* are we scanning up or down through channels? */
+	if (mode == MODE_MULT_CHAN_UP)
+		devpriv->cmd6 |= CMD6_SCANUP;
+	else
+		devpriv->cmd6 &= ~CMD6_SCANUP;
+
+	devpriv->write_byte(dev, devpriv->cmd6, CMD6_REG);
+}
+
+static unsigned int labpc_read_adc_fifo(struct comedi_device *dev)
+{
+	struct labpc_private *devpriv = dev->private;
+	unsigned int lsb = devpriv->read_byte(dev, ADC_FIFO_REG);
+	unsigned int msb = devpriv->read_byte(dev, ADC_FIFO_REG);
+
+	return (msb << 8) | lsb;
+}
+
+static void labpc_clear_adc_fifo(struct comedi_device *dev)
+{
+	struct labpc_private *devpriv = dev->private;
+
+	devpriv->write_byte(dev, 0x1, ADC_FIFO_CLEAR_REG);
+	labpc_read_adc_fifo(dev);
+}
+
+static int labpc_ai_eoc(struct comedi_device *dev,
+			struct comedi_subdevice *s,
+			struct comedi_insn *insn,
+			unsigned long context)
+{
+	struct labpc_private *devpriv = dev->private;
+
+	devpriv->stat1 = devpriv->read_byte(dev, STAT1_REG);
+	if (devpriv->stat1 & STAT1_DAVAIL)
+		return 0;
+	return -EBUSY;
+}
+
+static int labpc_ai_insn_read(struct comedi_device *dev,
+			      struct comedi_subdevice *s,
+			      struct comedi_insn *insn,
+			      unsigned int *data)
+{
+	struct labpc_private *devpriv = dev->private;
+	unsigned int chan = CR_CHAN(insn->chanspec);
+	unsigned int range = CR_RANGE(insn->chanspec);
+	unsigned int aref = CR_AREF(insn->chanspec);
+	int ret;
+	int i;
+
+	/* disable timed conversions, interrupt generation and dma */
+	labpc_cancel(dev, s);
+
+	labpc_ai_set_chan_and_gain(dev, MODE_SINGLE_CHAN, chan, range, aref);
+
+	labpc_setup_cmd6_reg(dev, s, MODE_SINGLE_CHAN, fifo_not_empty_transfer,
+			     range, aref, false);
+
+	/* setup cmd4 register */
+	devpriv->cmd4 = 0;
+	devpriv->cmd4 |= CMD4_ECLKRCV;
+	/* single-ended/differential */
+	if (aref == AREF_DIFF)
+		devpriv->cmd4 |= CMD4_SEDIFF;
+	devpriv->write_byte(dev, devpriv->cmd4, CMD4_REG);
+
+	/* initialize pacer counter to prevent any problems */
+	labpc_counter_set_mode(dev, COUNTER_A_BASE_REG, 0, I8254_MODE2);
+
+	labpc_clear_adc_fifo(dev);
+
+	for (i = 0; i < insn->n; i++) {
+		/* trigger conversion */
+		devpriv->write_byte(dev, 0x1, ADC_START_CONVERT_REG);
+
+		ret = comedi_timeout(dev, s, insn, labpc_ai_eoc, 0);
+		if (ret)
+			return ret;
+
+		data[i] = labpc_read_adc_fifo(dev);
+	}
+
+	return insn->n;
+}
+
+static bool labpc_use_continuous_mode(const struct comedi_cmd *cmd,
+				      enum scan_mode mode)
+{
+	if (mode == MODE_SINGLE_CHAN || cmd->scan_begin_src == TRIG_FOLLOW)
+		return true;
+
+	return false;
+}
+
+static unsigned int labpc_ai_convert_period(const struct comedi_cmd *cmd,
+					    enum scan_mode mode)
+{
+	if (cmd->convert_src != TRIG_TIMER)
+		return 0;
+
+	if (mode == MODE_SINGLE_CHAN && cmd->scan_begin_src == TRIG_TIMER)
+		return cmd->scan_begin_arg;
+
+	return cmd->convert_arg;
+}
+
+static void labpc_set_ai_convert_period(struct comedi_cmd *cmd,
+					enum scan_mode mode, unsigned int ns)
+{
+	if (cmd->convert_src != TRIG_TIMER)
+		return;
+
+	if (mode == MODE_SINGLE_CHAN &&
+	    cmd->scan_begin_src == TRIG_TIMER) {
+		cmd->scan_begin_arg = ns;
+		if (cmd->convert_arg > cmd->scan_begin_arg)
+			cmd->convert_arg = cmd->scan_begin_arg;
+	} else {
+		cmd->convert_arg = ns;
+	}
+}
+
+static unsigned int labpc_ai_scan_period(const struct comedi_cmd *cmd,
+					 enum scan_mode mode)
+{
+	if (cmd->scan_begin_src != TRIG_TIMER)
+		return 0;
+
+	if (mode == MODE_SINGLE_CHAN && cmd->convert_src == TRIG_TIMER)
+		return 0;
+
+	return cmd->scan_begin_arg;
+}
+
+static void labpc_set_ai_scan_period(struct comedi_cmd *cmd,
+				     enum scan_mode mode, unsigned int ns)
+{
+	if (cmd->scan_begin_src != TRIG_TIMER)
+		return;
+
+	if (mode == MODE_SINGLE_CHAN && cmd->convert_src == TRIG_TIMER)
+		return;
+
+	cmd->scan_begin_arg = ns;
+}
+
+/* figures out what counter values to use based on command */
+static void labpc_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd,
+			     enum scan_mode mode)
+{
+	struct labpc_private *devpriv = dev->private;
+	/* max value for 16 bit counter in mode 2 */
+	const int max_counter_value = 0x10000;
+	/* min value for 16 bit counter in mode 2 */
+	const int min_counter_value = 2;
+	unsigned int base_period;
+	unsigned int scan_period;
+	unsigned int convert_period;
+
+	/*
+	 * if both convert and scan triggers are TRIG_TIMER, then they
+	 * both rely on counter b0
+	 */
+	convert_period = labpc_ai_convert_period(cmd, mode);
+	scan_period = labpc_ai_scan_period(cmd, mode);
+	if (convert_period && scan_period) {
+		/*
+		 * pick the lowest b0 divisor value we can (for maximum input
+		 * clock speed on convert and scan counters)
+		 */
+		devpriv->divisor_b0 = (scan_period - 1) /
+		    (I8254_OSC_BASE_2MHZ * max_counter_value) + 1;
+		if (devpriv->divisor_b0 < min_counter_value)
+			devpriv->divisor_b0 = min_counter_value;
+		if (devpriv->divisor_b0 > max_counter_value)
+			devpriv->divisor_b0 = max_counter_value;
+
+		base_period = I8254_OSC_BASE_2MHZ * devpriv->divisor_b0;
+
+		/*  set a0 for conversion frequency and b1 for scan frequency */
+		switch (cmd->flags & TRIG_ROUND_MASK) {
+		default:
+		case TRIG_ROUND_NEAREST:
+			devpriv->divisor_a0 =
+			    (convert_period + (base_period / 2)) / base_period;
+			devpriv->divisor_b1 =
+			    (scan_period + (base_period / 2)) / base_period;
+			break;
+		case TRIG_ROUND_UP:
+			devpriv->divisor_a0 =
+			    (convert_period + (base_period - 1)) / base_period;
+			devpriv->divisor_b1 =
+			    (scan_period + (base_period - 1)) / base_period;
+			break;
+		case TRIG_ROUND_DOWN:
+			devpriv->divisor_a0 = convert_period / base_period;
+			devpriv->divisor_b1 = scan_period / base_period;
+			break;
+		}
+		/*  make sure a0 and b1 values are acceptable */
+		if (devpriv->divisor_a0 < min_counter_value)
+			devpriv->divisor_a0 = min_counter_value;
+		if (devpriv->divisor_a0 > max_counter_value)
+			devpriv->divisor_a0 = max_counter_value;
+		if (devpriv->divisor_b1 < min_counter_value)
+			devpriv->divisor_b1 = min_counter_value;
+		if (devpriv->divisor_b1 > max_counter_value)
+			devpriv->divisor_b1 = max_counter_value;
+		/*  write corrected timings to command */
+		labpc_set_ai_convert_period(cmd, mode,
+					    base_period * devpriv->divisor_a0);
+		labpc_set_ai_scan_period(cmd, mode,
+					 base_period * devpriv->divisor_b1);
+		/*
+		 * if only one TRIG_TIMER is used, we can employ the generic
+		 * cascaded timing functions
+		 */
+	} else if (scan_period) {
+		/*
+		 * calculate cascaded counter values
+		 * that give desired scan timing
+		 */
+		i8253_cascade_ns_to_timer(I8254_OSC_BASE_2MHZ,
+					  &devpriv->divisor_b1,
+					  &devpriv->divisor_b0,
+					  &scan_period, cmd->flags);
+		labpc_set_ai_scan_period(cmd, mode, scan_period);
+	} else if (convert_period) {
+		/*
+		 * calculate cascaded counter values
+		 * that give desired conversion timing
+		 */
+		i8253_cascade_ns_to_timer(I8254_OSC_BASE_2MHZ,
+					  &devpriv->divisor_a0,
+					  &devpriv->divisor_b0,
+					  &convert_period, cmd->flags);
+		labpc_set_ai_convert_period(cmd, mode, convert_period);
+	}
+}
+
+static enum scan_mode labpc_ai_scan_mode(const struct comedi_cmd *cmd)
+{
+	unsigned int chan0;
+	unsigned int chan1;
+
+	if (cmd->chanlist_len == 1)
+		return MODE_SINGLE_CHAN;
+
+	/* chanlist may be NULL during cmdtest */
+	if (cmd->chanlist == NULL)
+		return MODE_MULT_CHAN_UP;
+
+	chan0 = CR_CHAN(cmd->chanlist[0]);
+	chan1 = CR_CHAN(cmd->chanlist[1]);
+
+	if (chan0 < chan1)
+		return MODE_MULT_CHAN_UP;
+
+	if (chan0 > chan1)
+		return MODE_MULT_CHAN_DOWN;
+
+	return MODE_SINGLE_CHAN_INTERVAL;
+}
+
+static int labpc_ai_check_chanlist(struct comedi_device *dev,
+				   struct comedi_subdevice *s,
+				   struct comedi_cmd *cmd)
+{
+	enum scan_mode mode = labpc_ai_scan_mode(cmd);
+	unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);
+	unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
+	unsigned int aref0 = CR_AREF(cmd->chanlist[0]);
+	int i;
+
+	if (mode == MODE_SINGLE_CHAN)
+		return 0;
+
+	for (i = 0; i < cmd->chanlist_len; i++) {
+		unsigned int chan = CR_CHAN(cmd->chanlist[i]);
+		unsigned int range = CR_RANGE(cmd->chanlist[i]);
+		unsigned int aref = CR_AREF(cmd->chanlist[i]);
+
+		switch (mode) {
+		case MODE_SINGLE_CHAN:
+			break;
+		case MODE_SINGLE_CHAN_INTERVAL:
+			if (chan != chan0) {
+				dev_dbg(dev->class_dev,
+					"channel scanning order specified in chanlist is not supported by hardware\n");
+				return -EINVAL;
+			}
+			break;
+		case MODE_MULT_CHAN_UP:
+			if (chan != i) {
+				dev_dbg(dev->class_dev,
+					"channel scanning order specified in chanlist is not supported by hardware\n");
+				return -EINVAL;
+			}
+			break;
+		case MODE_MULT_CHAN_DOWN:
+			if (chan != (cmd->chanlist_len - i - 1)) {
+				dev_dbg(dev->class_dev,
+					"channel scanning order specified in chanlist is not supported by hardware\n");
+				return -EINVAL;
+			}
+			break;
+		}
+
+		if (range != range0) {
+			dev_dbg(dev->class_dev,
+				"entries in chanlist must all have the same range\n");
+			return -EINVAL;
+		}
+
+		if (aref != aref0) {
+			dev_dbg(dev->class_dev,
+				"entries in chanlist must all have the same reference\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int labpc_ai_cmdtest(struct comedi_device *dev,
+			    struct comedi_subdevice *s, struct comedi_cmd *cmd)
+{
+	const struct labpc_boardinfo *board = comedi_board(dev);
+	int err = 0;
+	int tmp, tmp2;
+	unsigned int stop_mask;
+	enum scan_mode mode;
+
+	/* Step 1 : check if triggers are trivially valid */
+
+	err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT);
+	err |= cfc_check_trigger_src(&cmd->scan_begin_src,
+					TRIG_TIMER | TRIG_FOLLOW | TRIG_EXT);
+	err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER | TRIG_EXT);
+	err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
+
+	stop_mask = TRIG_COUNT | TRIG_NONE;
+	if (board->is_labpc1200)
+		stop_mask |= TRIG_EXT;
+	err |= cfc_check_trigger_src(&cmd->stop_src, stop_mask);
+
+	if (err)
+		return 1;
+
+	/* Step 2a : make sure trigger sources are unique */
+
+	err |= cfc_check_trigger_is_unique(cmd->start_src);
+	err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
+	err |= cfc_check_trigger_is_unique(cmd->convert_src);
+	err |= cfc_check_trigger_is_unique(cmd->stop_src);
+
+	/* Step 2b : and mutually compatible */
+
+	/* can't have external stop and start triggers at once */
+	if (cmd->start_src == TRIG_EXT && cmd->stop_src == TRIG_EXT)
+		err++;
+
+	if (err)
+		return 2;
+
+	/* Step 3: check if arguments are trivially valid */
+
+	switch (cmd->start_src) {
+	case TRIG_NOW:
+		err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
+		break;
+	case TRIG_EXT:
+		/* start_arg value is ignored */
+		break;
+	}
+
+	if (!cmd->chanlist_len)
+		err |= -EINVAL;
+	err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
+
+	if (cmd->convert_src == TRIG_TIMER)
+		err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
+						 board->ai_speed);
+
+	/* make sure scan timing is not too fast */
+	if (cmd->scan_begin_src == TRIG_TIMER) {
+		if (cmd->convert_src == TRIG_TIMER)
+			err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
+					cmd->convert_arg * cmd->chanlist_len);
+		err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
+				board->ai_speed * cmd->chanlist_len);
+	}
+
+	switch (cmd->stop_src) {
+	case TRIG_COUNT:
+		err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
+		break;
+	case TRIG_NONE:
+		err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
+		break;
+		/*
+		 * TRIG_EXT doesn't care since it doesn't
+		 * trigger off a numbered channel
+		 */
+	default:
+		break;
+	}
+
+	if (err)
+		return 3;
+
+	/* step 4: fix up any arguments */
+
+	tmp = cmd->convert_arg;
+	tmp2 = cmd->scan_begin_arg;
+	mode = labpc_ai_scan_mode(cmd);
+	labpc_adc_timing(dev, cmd, mode);
+	if (tmp != cmd->convert_arg || tmp2 != cmd->scan_begin_arg)
+		err++;
+
+	if (err)
+		return 4;
+
+	/* Step 5: check channel list if it exists */
+	if (cmd->chanlist && cmd->chanlist_len > 0)
+		err |= labpc_ai_check_chanlist(dev, s, cmd);
+
+	if (err)
+		return 5;
+
+	return 0;
+}
+
+static int labpc_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
+{
+	const struct labpc_boardinfo *board = comedi_board(dev);
+	struct labpc_private *devpriv = dev->private;
+	struct comedi_async *async = s->async;
+	struct comedi_cmd *cmd = &async->cmd;
+	enum scan_mode mode = labpc_ai_scan_mode(cmd);
+	unsigned int chanspec = (mode == MODE_MULT_CHAN_UP) ?
+				cmd->chanlist[cmd->chanlist_len - 1] :
+				cmd->chanlist[0];
+	unsigned int chan = CR_CHAN(chanspec);
+	unsigned int range = CR_RANGE(chanspec);
+	unsigned int aref = CR_AREF(chanspec);
+	enum transfer_type xfer;
+	unsigned long flags;
+
+	/* make sure board is disabled before setting up acquisition */
+	labpc_cancel(dev, s);
+
+	/*  initialize software conversion count */
+	if (cmd->stop_src == TRIG_COUNT)
+		devpriv->count = cmd->stop_arg * cmd->chanlist_len;
+
+	/*  setup hardware conversion counter */
+	if (cmd->stop_src == TRIG_EXT) {
+		/*
+		 * load counter a1 with count of 3
+		 * (pc+ manual says this is minimum allowed) using mode 0
+		 */
+		labpc_counter_load(dev, COUNTER_A_BASE_REG,
+				   1, 3, I8254_MODE0);
+	} else	{
+		/* just put counter a1 in mode 0 to set its output low */
+		labpc_counter_set_mode(dev, COUNTER_A_BASE_REG, 1, I8254_MODE0);
+	}
+
+	/* figure out what method we will use to transfer data */
+	if (labpc_have_dma_chan(dev) &&
+	    /* dma unsafe at RT priority,
+	     * and too much setup time for TRIG_WAKE_EOS */
+	    (cmd->flags & (TRIG_WAKE_EOS | TRIG_RT)) == 0)
+		xfer = isa_dma_transfer;
+	else if (/* pc-plus has no fifo-half full interrupt */
+		 board->is_labpc1200 &&
+		 /* wake-end-of-scan should interrupt on fifo not empty */
+		 (cmd->flags & TRIG_WAKE_EOS) == 0 &&
+		 /* make sure we are taking more than just a few points */
+		 (cmd->stop_src != TRIG_COUNT || devpriv->count > 256))
+		xfer = fifo_half_full_transfer;
+	else
+		xfer = fifo_not_empty_transfer;
+	devpriv->current_transfer = xfer;
+
+	labpc_ai_set_chan_and_gain(dev, mode, chan, range, aref);
+
+	labpc_setup_cmd6_reg(dev, s, mode, xfer, range, aref,
+			     (cmd->stop_src == TRIG_EXT));
+
+	/* manual says to set scan enable bit on second pass */
+	if (mode == MODE_MULT_CHAN_UP || mode == MODE_MULT_CHAN_DOWN) {
+		devpriv->cmd1 |= CMD1_SCANEN;
+		/* need a brief delay before enabling scan, or scan
+		 * list will get screwed when you switch
+		 * between scan up to scan down mode - dunno why */
+		udelay(1);
+		devpriv->write_byte(dev, devpriv->cmd1, CMD1_REG);
+	}
+
+	devpriv->write_byte(dev, cmd->chanlist_len, INTERVAL_COUNT_REG);
+	/*  load count */
+	devpriv->write_byte(dev, 0x1, INTERVAL_STROBE_REG);
+
+	if (cmd->convert_src == TRIG_TIMER ||
+	    cmd->scan_begin_src == TRIG_TIMER) {
+		/*  set up pacing */
+		labpc_adc_timing(dev, cmd, mode);
+		/*  load counter b0 in mode 3 */
+		labpc_counter_load(dev, COUNTER_B_BASE_REG,
+				   0, devpriv->divisor_b0, I8254_MODE3);
+	}
+	/*  set up conversion pacing */
+	if (labpc_ai_convert_period(cmd, mode)) {
+		/*  load counter a0 in mode 2 */
+		labpc_counter_load(dev, COUNTER_A_BASE_REG,
+				   0, devpriv->divisor_a0, I8254_MODE2);
+	} else {
+		/* initialize pacer counter to prevent any problems */
+		labpc_counter_set_mode(dev, COUNTER_A_BASE_REG, 0, I8254_MODE2);
+	}
+
+	/*  set up scan pacing */
+	if (labpc_ai_scan_period(cmd, mode)) {
+		/*  load counter b1 in mode 2 */
+		labpc_counter_load(dev, COUNTER_B_BASE_REG,
+				   1, devpriv->divisor_b1, I8254_MODE2);
+	}
+
+	labpc_clear_adc_fifo(dev);
+
+	if (xfer == isa_dma_transfer)
+		labpc_setup_dma(dev, s);
+
+	/*  enable error interrupts */
+	devpriv->cmd3 |= CMD3_ERRINTEN;
+	/*  enable fifo not empty interrupt? */
+	if (xfer == fifo_not_empty_transfer)
+		devpriv->cmd3 |= CMD3_FIFOINTEN;
+	devpriv->write_byte(dev, devpriv->cmd3, CMD3_REG);
+
+	/*  setup any external triggering/pacing (cmd4 register) */
+	devpriv->cmd4 = 0;
+	if (cmd->convert_src != TRIG_EXT)
+		devpriv->cmd4 |= CMD4_ECLKRCV;
+	/* XXX should discard first scan when using interval scanning
+	 * since manual says it is not synced with scan clock */
+	if (!labpc_use_continuous_mode(cmd, mode)) {
+		devpriv->cmd4 |= CMD4_INTSCAN;
+		if (cmd->scan_begin_src == TRIG_EXT)
+			devpriv->cmd4 |= CMD4_EOIRCV;
+	}
+	/*  single-ended/differential */
+	if (aref == AREF_DIFF)
+		devpriv->cmd4 |= CMD4_SEDIFF;
+	devpriv->write_byte(dev, devpriv->cmd4, CMD4_REG);
+
+	/*  startup acquisition */
+
+	spin_lock_irqsave(&dev->spinlock, flags);
+
+	/* use 2 cascaded counters for pacing */
+	devpriv->cmd2 |= CMD2_TBSEL;
+
+	devpriv->cmd2 &= ~(CMD2_SWTRIG | CMD2_HWTRIG | CMD2_PRETRIG);
+	if (cmd->start_src == TRIG_EXT)
+		devpriv->cmd2 |= CMD2_HWTRIG;
+	else
+		devpriv->cmd2 |= CMD2_SWTRIG;
+	if (cmd->stop_src == TRIG_EXT)
+		devpriv->cmd2 |= (CMD2_HWTRIG | CMD2_PRETRIG);
+
+	devpriv->write_byte(dev, devpriv->cmd2, CMD2_REG);
+
+	spin_unlock_irqrestore(&dev->spinlock, flags);
+
+	return 0;
+}
+
+/* read all available samples from ai fifo */
+static int labpc_drain_fifo(struct comedi_device *dev)
+{
+	struct labpc_private *devpriv = dev->private;
+	struct comedi_async *async = dev->read_subdev->async;
+	struct comedi_cmd *cmd = &async->cmd;
+	unsigned short data;
+	const int timeout = 10000;
+	unsigned int i;
+
+	devpriv->stat1 = devpriv->read_byte(dev, STAT1_REG);
+
+	for (i = 0; (devpriv->stat1 & STAT1_DAVAIL) && i < timeout;
+	     i++) {
+		/*  quit if we have all the data we want */
+		if (cmd->stop_src == TRIG_COUNT) {
+			if (devpriv->count == 0)
+				break;
+			devpriv->count--;
+		}
+		data = labpc_read_adc_fifo(dev);
+		cfc_write_to_buffer(dev->read_subdev, data);
+		devpriv->stat1 = devpriv->read_byte(dev, STAT1_REG);
+	}
+	if (i == timeout) {
+		dev_err(dev->class_dev, "ai timeout, fifo never empties\n");
+		async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
+		return -1;
+	}
+
+	return 0;
+}
+
+/* makes sure all data acquired by board is transferred to comedi (used
+ * when acquisition is terminated by stop_src == TRIG_EXT). */
+static void labpc_drain_dregs(struct comedi_device *dev)
+{
+	struct labpc_private *devpriv = dev->private;
+
+	if (devpriv->current_transfer == isa_dma_transfer)
+		labpc_drain_dma(dev);
+
+	labpc_drain_fifo(dev);
+}
+
+/* interrupt service routine */
+static irqreturn_t labpc_interrupt(int irq, void *d)
+{
+	struct comedi_device *dev = d;
+	const struct labpc_boardinfo *board = comedi_board(dev);
+	struct labpc_private *devpriv = dev->private;
+	struct comedi_subdevice *s = dev->read_subdev;
+	struct comedi_async *async;
+	struct comedi_cmd *cmd;
+
+	if (!dev->attached) {
+		dev_err(dev->class_dev, "premature interrupt\n");
+		return IRQ_HANDLED;
+	}
+
+	async = s->async;
+	cmd = &async->cmd;
+
+	/* read board status */
+	devpriv->stat1 = devpriv->read_byte(dev, STAT1_REG);
+	if (board->is_labpc1200)
+		devpriv->stat2 = devpriv->read_byte(dev, STAT2_REG);
+
+	if ((devpriv->stat1 & (STAT1_GATA0 | STAT1_CNTINT | STAT1_OVERFLOW |
+			       STAT1_OVERRUN | STAT1_DAVAIL)) == 0 &&
+	    (devpriv->stat2 & STAT2_OUTA1) == 0 &&
+	    (devpriv->stat2 & STAT2_FIFONHF)) {
+		return IRQ_NONE;
+	}
+
+	if (devpriv->stat1 & STAT1_OVERRUN) {
+		/* clear error interrupt */
+		devpriv->write_byte(dev, 0x1, ADC_FIFO_CLEAR_REG);
+		async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
+		cfc_handle_events(dev, s);
+		dev_err(dev->class_dev, "overrun\n");
+		return IRQ_HANDLED;
+	}
+
+	if (devpriv->current_transfer == isa_dma_transfer)
+		labpc_handle_dma_status(dev);
+	else
+		labpc_drain_fifo(dev);
+
+	if (devpriv->stat1 & STAT1_CNTINT) {
+		dev_err(dev->class_dev, "handled timer interrupt?\n");
+		/*  clear it */
+		devpriv->write_byte(dev, 0x1, TIMER_CLEAR_REG);
+	}
+
+	if (devpriv->stat1 & STAT1_OVERFLOW) {
+		/*  clear error interrupt */
+		devpriv->write_byte(dev, 0x1, ADC_FIFO_CLEAR_REG);
+		async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
+		cfc_handle_events(dev, s);
+		dev_err(dev->class_dev, "overflow\n");
+		return IRQ_HANDLED;
+	}
+	/*  handle external stop trigger */
+	if (cmd->stop_src == TRIG_EXT) {
+		if (devpriv->stat2 & STAT2_OUTA1) {
+			labpc_drain_dregs(dev);
+			async->events |= COMEDI_CB_EOA;
+		}
+	}
+
+	/* TRIG_COUNT end of acquisition */
+	if (cmd->stop_src == TRIG_COUNT) {
+		if (devpriv->count == 0)
+			async->events |= COMEDI_CB_EOA;
+	}
+
+	cfc_handle_events(dev, s);
+	return IRQ_HANDLED;
+}
+
+static int labpc_ao_insn_write(struct comedi_device *dev,
+			       struct comedi_subdevice *s,
+			       struct comedi_insn *insn,
+			       unsigned int *data)
+{
+	const struct labpc_boardinfo *board = comedi_board(dev);
+	struct labpc_private *devpriv = dev->private;
+	int channel, range;
+	unsigned long flags;
+	int lsb, msb;
+
+	channel = CR_CHAN(insn->chanspec);
+
+	/* turn off pacing of analog output channel */
+	/* note: hardware bug in daqcard-1200 means pacing cannot
+	 * be independently enabled/disabled for its the two channels */
+	spin_lock_irqsave(&dev->spinlock, flags);
+	devpriv->cmd2 &= ~CMD2_LDAC(channel);
+	devpriv->write_byte(dev, devpriv->cmd2, CMD2_REG);
+	spin_unlock_irqrestore(&dev->spinlock, flags);
+
+	/* set range */
+	if (board->is_labpc1200) {
+		range = CR_RANGE(insn->chanspec);
+		if (comedi_range_is_unipolar(s, range))
+			devpriv->cmd6 |= CMD6_DACUNI(channel);
+		else
+			devpriv->cmd6 &= ~CMD6_DACUNI(channel);
+		/*  write to register */
+		devpriv->write_byte(dev, devpriv->cmd6, CMD6_REG);
+	}
+	/* send data */
+	lsb = data[0] & 0xff;
+	msb = (data[0] >> 8) & 0xff;
+	devpriv->write_byte(dev, lsb, DAC_LSB_REG(channel));
+	devpriv->write_byte(dev, msb, DAC_MSB_REG(channel));
+
+	/* remember value for readback */
+	devpriv->ao_value[channel] = data[0];
+
+	return 1;
+}
+
+static int labpc_ao_insn_read(struct comedi_device *dev,
+			      struct comedi_subdevice *s,
+			      struct comedi_insn *insn,
+			      unsigned int *data)
+{
+	struct labpc_private *devpriv = dev->private;
+
+	data[0] = devpriv->ao_value[CR_CHAN(insn->chanspec)];
+
+	return 1;
+}
+
+/* lowlevel write to eeprom/dac */
+static void labpc_serial_out(struct comedi_device *dev, unsigned int value,
+			     unsigned int value_width)
+{
+	struct labpc_private *devpriv = dev->private;
+	int i;
+
+	for (i = 1; i <= value_width; i++) {
+		/*  clear serial clock */
+		devpriv->cmd5 &= ~CMD5_SCLK;
+		/*  send bits most significant bit first */
+		if (value & (1 << (value_width - i)))
+			devpriv->cmd5 |= CMD5_SDATA;
+		else
+			devpriv->cmd5 &= ~CMD5_SDATA;
+		udelay(1);
+		devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+		/*  set clock to load bit */
+		devpriv->cmd5 |= CMD5_SCLK;
+		udelay(1);
+		devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+	}
+}
+
+/* lowlevel read from eeprom */
+static unsigned int labpc_serial_in(struct comedi_device *dev)
+{
+	struct labpc_private *devpriv = dev->private;
+	unsigned int value = 0;
+	int i;
+	const int value_width = 8;	/*  number of bits wide values are */
+
+	for (i = 1; i <= value_width; i++) {
+		/*  set serial clock */
+		devpriv->cmd5 |= CMD5_SCLK;
+		udelay(1);
+		devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+		/*  clear clock bit */
+		devpriv->cmd5 &= ~CMD5_SCLK;
+		udelay(1);
+		devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+		/*  read bits most significant bit first */
+		udelay(1);
+		devpriv->stat2 = devpriv->read_byte(dev, STAT2_REG);
+		if (devpriv->stat2 & STAT2_PROMOUT)
+			value |= 1 << (value_width - i);
+	}
+
+	return value;
+}
+
+static unsigned int labpc_eeprom_read(struct comedi_device *dev,
+				      unsigned int address)
+{
+	struct labpc_private *devpriv = dev->private;
+	unsigned int value;
+	/*  bits to tell eeprom to expect a read */
+	const int read_instruction = 0x3;
+	/*  8 bit write lengths to eeprom */
+	const int write_length = 8;
+
+	/*  enable read/write to eeprom */
+	devpriv->cmd5 &= ~CMD5_EEPROMCS;
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+	devpriv->cmd5 |= (CMD5_EEPROMCS | CMD5_WRTPRT);
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+
+	/*  send read instruction */
+	labpc_serial_out(dev, read_instruction, write_length);
+	/*  send 8 bit address to read from */
+	labpc_serial_out(dev, address, write_length);
+	/*  read result */
+	value = labpc_serial_in(dev);
+
+	/*  disable read/write to eeprom */
+	devpriv->cmd5 &= ~(CMD5_EEPROMCS | CMD5_WRTPRT);
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+
+	return value;
+}
+
+static unsigned int labpc_eeprom_read_status(struct comedi_device *dev)
+{
+	struct labpc_private *devpriv = dev->private;
+	unsigned int value;
+	const int read_status_instruction = 0x5;
+	const int write_length = 8;	/*  8 bit write lengths to eeprom */
+
+	/*  enable read/write to eeprom */
+	devpriv->cmd5 &= ~CMD5_EEPROMCS;
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+	devpriv->cmd5 |= (CMD5_EEPROMCS | CMD5_WRTPRT);
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+
+	/*  send read status instruction */
+	labpc_serial_out(dev, read_status_instruction, write_length);
+	/*  read result */
+	value = labpc_serial_in(dev);
+
+	/*  disable read/write to eeprom */
+	devpriv->cmd5 &= ~(CMD5_EEPROMCS | CMD5_WRTPRT);
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+
+	return value;
+}
+
+static int labpc_eeprom_write(struct comedi_device *dev,
+			      unsigned int address, unsigned int value)
+{
+	struct labpc_private *devpriv = dev->private;
+	const int write_enable_instruction = 0x6;
+	const int write_instruction = 0x2;
+	const int write_length = 8;	/*  8 bit write lengths to eeprom */
+	const int write_in_progress_bit = 0x1;
+	const int timeout = 10000;
+	int i;
+
+	/*  make sure there isn't already a write in progress */
+	for (i = 0; i < timeout; i++) {
+		if ((labpc_eeprom_read_status(dev) & write_in_progress_bit) ==
+		    0)
+			break;
+	}
+	if (i == timeout) {
+		dev_err(dev->class_dev, "eeprom write timed out\n");
+		return -ETIME;
+	}
+	/*  update software copy of eeprom */
+	devpriv->eeprom_data[address] = value;
+
+	/*  enable read/write to eeprom */
+	devpriv->cmd5 &= ~CMD5_EEPROMCS;
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+	devpriv->cmd5 |= (CMD5_EEPROMCS | CMD5_WRTPRT);
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+
+	/*  send write_enable instruction */
+	labpc_serial_out(dev, write_enable_instruction, write_length);
+	devpriv->cmd5 &= ~CMD5_EEPROMCS;
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+
+	/*  send write instruction */
+	devpriv->cmd5 |= CMD5_EEPROMCS;
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+	labpc_serial_out(dev, write_instruction, write_length);
+	/*  send 8 bit address to write to */
+	labpc_serial_out(dev, address, write_length);
+	/*  write value */
+	labpc_serial_out(dev, value, write_length);
+	devpriv->cmd5 &= ~CMD5_EEPROMCS;
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+
+	/*  disable read/write to eeprom */
+	devpriv->cmd5 &= ~(CMD5_EEPROMCS | CMD5_WRTPRT);
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+
+	return 0;
+}
+
+/* writes to 8 bit calibration dacs */
+static void write_caldac(struct comedi_device *dev, unsigned int channel,
+			 unsigned int value)
+{
+	struct labpc_private *devpriv = dev->private;
+
+	if (value == devpriv->caldac[channel])
+		return;
+	devpriv->caldac[channel] = value;
+
+	/*  clear caldac load bit and make sure we don't write to eeprom */
+	devpriv->cmd5 &= ~(CMD5_CALDACLD | CMD5_EEPROMCS | CMD5_WRTPRT);
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+
+	/*  write 4 bit channel */
+	labpc_serial_out(dev, channel, 4);
+	/*  write 8 bit caldac value */
+	labpc_serial_out(dev, value, 8);
+
+	/*  set and clear caldac bit to load caldac value */
+	devpriv->cmd5 |= CMD5_CALDACLD;
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+	devpriv->cmd5 &= ~CMD5_CALDACLD;
+	udelay(1);
+	devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+}
+
+static int labpc_calib_insn_write(struct comedi_device *dev,
+				  struct comedi_subdevice *s,
+				  struct comedi_insn *insn,
+				  unsigned int *data)
+{
+	unsigned int chan = CR_CHAN(insn->chanspec);
+
+	/*
+	 * Only write the last data value to the caldac. Preceding
+	 * data would be overwritten anyway.
+	 */
+	if (insn->n > 0)
+		write_caldac(dev, chan, data[insn->n - 1]);
+
+	return insn->n;
+}
+
+static int labpc_calib_insn_read(struct comedi_device *dev,
+				 struct comedi_subdevice *s,
+				 struct comedi_insn *insn,
+				 unsigned int *data)
+{
+	struct labpc_private *devpriv = dev->private;
+	unsigned int chan = CR_CHAN(insn->chanspec);
+	int i;
+
+	for (i = 0; i < insn->n; i++)
+		data[i] = devpriv->caldac[chan];
+
+	return insn->n;
+}
+
+static int labpc_eeprom_insn_write(struct comedi_device *dev,
+				   struct comedi_subdevice *s,
+				   struct comedi_insn *insn,
+				   unsigned int *data)
+{
+	unsigned int chan = CR_CHAN(insn->chanspec);
+	int ret;
+
+	/* only allow writes to user area of eeprom */
+	if (chan < 16 || chan > 127)
+		return -EINVAL;
+
+	/*
+	 * Only write the last data value to the eeprom. Preceding
+	 * data would be overwritten anyway.
+	 */
+	if (insn->n > 0) {
+		ret = labpc_eeprom_write(dev, chan, data[insn->n - 1]);
+		if (ret)
+			return ret;
+	}
+
+	return insn->n;
+}
+
+static int labpc_eeprom_insn_read(struct comedi_device *dev,
+				  struct comedi_subdevice *s,
+				  struct comedi_insn *insn,
+				  unsigned int *data)
+{
+	struct labpc_private *devpriv = dev->private;
+	unsigned int chan = CR_CHAN(insn->chanspec);
+	int i;
+
+	for (i = 0; i < insn->n; i++)
+		data[i] = devpriv->eeprom_data[chan];
+
+	return insn->n;
+}
+
+int labpc_common_attach(struct comedi_device *dev,
+			unsigned int irq, unsigned long isr_flags)
+{
+	const struct labpc_boardinfo *board = comedi_board(dev);
+	struct labpc_private *devpriv = dev->private;
+	struct comedi_subdevice *s;
+	int ret;
+	int i;
+
+	if (dev->mmio) {
+		devpriv->read_byte = labpc_readb;
+		devpriv->write_byte = labpc_writeb;
+	} else {
+		devpriv->read_byte = labpc_inb;
+		devpriv->write_byte = labpc_outb;
+	}
+
+	/* initialize board's command registers */
+	devpriv->write_byte(dev, devpriv->cmd1, CMD1_REG);
+	devpriv->write_byte(dev, devpriv->cmd2, CMD2_REG);
+	devpriv->write_byte(dev, devpriv->cmd3, CMD3_REG);
+	devpriv->write_byte(dev, devpriv->cmd4, CMD4_REG);
+	if (board->is_labpc1200) {
+		devpriv->write_byte(dev, devpriv->cmd5, CMD5_REG);
+		devpriv->write_byte(dev, devpriv->cmd6, CMD6_REG);
+	}
+
+	if (irq) {
+		ret = request_irq(irq, labpc_interrupt, isr_flags,
+				  dev->board_name, dev);
+		if (ret == 0)
+			dev->irq = irq;
+	}
+
+	ret = comedi_alloc_subdevices(dev, 5);
+	if (ret)
+		return ret;
+
+	/* analog input subdevice */
+	s = &dev->subdevices[0];
+	s->type		= COMEDI_SUBD_AI;
+	s->subdev_flags	= SDF_READABLE | SDF_GROUND | SDF_COMMON | SDF_DIFF;
+	s->n_chan	= 8;
+	s->len_chanlist	= 8;
+	s->maxdata	= 0x0fff;
+	s->range_table	= board->is_labpc1200 ?
+			  &range_labpc_1200_ai : &range_labpc_plus_ai;
+	s->insn_read	= labpc_ai_insn_read;
+	if (dev->irq) {
+		dev->read_subdev = s;
+		s->subdev_flags	|= SDF_CMD_READ;
+		s->do_cmd	= labpc_ai_cmd;
+		s->do_cmdtest	= labpc_ai_cmdtest;
+		s->cancel	= labpc_cancel;
+	}
+
+	/* analog output */
+	s = &dev->subdevices[1];
+	if (board->has_ao) {
+		s->type		= COMEDI_SUBD_AO;
+		s->subdev_flags	= SDF_READABLE | SDF_WRITABLE | SDF_GROUND;
+		s->n_chan	= NUM_AO_CHAN;
+		s->maxdata	= 0x0fff;
+		s->range_table	= &range_labpc_ao;
+		s->insn_read	= labpc_ao_insn_read;
+		s->insn_write	= labpc_ao_insn_write;
+
+		/* initialize analog outputs to a known value */
+		for (i = 0; i < s->n_chan; i++) {
+			short lsb, msb;
+
+			devpriv->ao_value[i] = s->maxdata / 2;
+			lsb = devpriv->ao_value[i] & 0xff;
+			msb = (devpriv->ao_value[i] >> 8) & 0xff;
+			devpriv->write_byte(dev, lsb, DAC_LSB_REG(i));
+			devpriv->write_byte(dev, msb, DAC_MSB_REG(i));
+		}
+	} else {
+		s->type		= COMEDI_SUBD_UNUSED;
+	}
+
+	/* 8255 dio */
+	s = &dev->subdevices[2];
+	if (dev->mmio)
+		ret = subdev_8255_mm_init(dev, s, NULL, DIO_BASE_REG);
+	else
+		ret = subdev_8255_init(dev, s, NULL, DIO_BASE_REG);
+	if (ret)
+		return ret;
+
+	/*  calibration subdevices for boards that have one */
+	s = &dev->subdevices[3];
+	if (board->is_labpc1200) {
+		s->type		= COMEDI_SUBD_CALIB;
+		s->subdev_flags	= SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
+		s->n_chan	= 16;
+		s->maxdata	= 0xff;
+		s->insn_read	= labpc_calib_insn_read;
+		s->insn_write	= labpc_calib_insn_write;
+
+		for (i = 0; i < s->n_chan; i++)
+			write_caldac(dev, i, s->maxdata / 2);
+	} else {
+		s->type		= COMEDI_SUBD_UNUSED;
+	}
+
+	/* EEPROM */
+	s = &dev->subdevices[4];
+	if (board->is_labpc1200) {
+		s->type		= COMEDI_SUBD_MEMORY;
+		s->subdev_flags	= SDF_READABLE | SDF_WRITABLE | SDF_INTERNAL;
+		s->n_chan	= EEPROM_SIZE;
+		s->maxdata	= 0xff;
+		s->insn_read	= labpc_eeprom_insn_read;
+		s->insn_write	= labpc_eeprom_insn_write;
+
+		for (i = 0; i < s->n_chan; i++)
+			devpriv->eeprom_data[i] = labpc_eeprom_read(dev, i);
+	} else {
+		s->type		= COMEDI_SUBD_UNUSED;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(labpc_common_attach);
+
+static int __init labpc_common_init(void)
+{
+	return 0;
+}
+module_init(labpc_common_init);
+
+static void __exit labpc_common_exit(void)
+{
+}
+module_exit(labpc_common_exit);
+
+MODULE_AUTHOR("Comedi http://www.comedi.org";);
+MODULE_DESCRIPTION("Comedi helper for ni_labpc, ni_labpc_pci, ni_labpc_cs");
+MODULE_LICENSE("GPL");
-- 
2.0.4

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