drivers/staging/comedi/drivers/rti800.c - kernel/skids - Git at Google

 /*
    comedi/drivers/rti800.c
    Hardware driver for Analog Devices RTI-800/815 board

    COMEDI - Linux Control and Measurement Device Interface
    Copyright (C) 1998 David A. Schleef <ds@schleef.org>

    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.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

  */
 /*
 Driver: rti800
 Description: Analog Devices RTI-800/815
 Author: ds
 Status: unknown
 Updated: Fri, 05 Sep 2008 14:50:44 +0100
 Devices: [Analog Devices] RTI-800 (rti800), RTI-815 (rti815)

 Configuration options:
   [0] - I/O port base address
   [1] - IRQ
   [2] - A/D reference
 	0 = differential
 	1 = pseudodifferential (common)
 	2 = single-ended
   [3] - A/D range
 	0 = [-10,10]
 	1 = [-5,5]
 	2 = [0,10]
   [4] - A/D encoding
 	0 = two's complement
 	1 = straight binary
   [5] - DAC 0 range
 	0 = [-10,10]
 	1 = [0,10]
   [6] - DAC 0 encoding
 	0 = two's complement
 	1 = straight binary
   [7] - DAC 1 range (same as DAC 0)
   [8] - DAC 1 encoding (same as DAC 0)
 */

 #include <linux/interrupt.h>
 #include "../comedidev.h"

 #include <linux/ioport.h>

 #define RTI800_SIZE 16

 #define RTI800_CSR 0
 #define RTI800_MUXGAIN 1
 #define RTI800_CONVERT 2
 #define RTI800_ADCLO 3
 #define RTI800_ADCHI 4
 #define RTI800_DAC0LO 5
 #define RTI800_DAC0HI 6
 #define RTI800_DAC1LO 7
 #define RTI800_DAC1HI 8
 #define RTI800_CLRFLAGS 9
 #define RTI800_DI 10
 #define RTI800_DO 11
 #define RTI800_9513A_DATA 12
 #define RTI800_9513A_CNTRL 13
 #define RTI800_9513A_STATUS 13

 /*
  * flags for CSR register
  */

 #define RTI800_BUSY		0x80
 #define RTI800_DONE		0x40
 #define RTI800_OVERRUN		0x20
 #define RTI800_TCR		0x10
 #define RTI800_DMA_ENAB		0x08
 #define RTI800_INTR_TC		0x04
 #define RTI800_INTR_EC		0x02
 #define RTI800_INTR_OVRN	0x01

 #define Am9513_8BITBUS

 #define Am9513_output_control(a)	outb(a, dev->iobase+RTI800_9513A_CNTRL)
 #define Am9513_output_data(a)		outb(a, dev->iobase+RTI800_9513A_DATA)
 #define Am9513_input_data()		inb(dev->iobase+RTI800_9513A_DATA)
 #define Am9513_input_status()		inb(dev->iobase+RTI800_9513A_STATUS)

 #include "am9513.h"

 static const struct comedi_lrange range_rti800_ai_10_bipolar = { 4, {
 								     BIP_RANGE
 								     (10),
 								     BIP_RANGE
 								     (1),
 								     BIP_RANGE
 								     (0.1),
 								     BIP_RANGE
 								     (0.02)
 								     }
 };

 static const struct comedi_lrange range_rti800_ai_5_bipolar = { 4, {
 								    BIP_RANGE
 								    (5),
 								    BIP_RANGE
 								    (0.5),
 								    BIP_RANGE
 								    (0.05),
 								    BIP_RANGE
 								    (0.01)
 								    }
 };

 static const struct comedi_lrange range_rti800_ai_unipolar = { 4, {
 								   UNI_RANGE
 								   (10),
 								   UNI_RANGE(1),
 								   UNI_RANGE
 								   (0.1),
 								   UNI_RANGE
 								   (0.02)
 								   }
 };

 struct rti800_board {

 	const char *name;
 	int has_ao;
 };

 static const struct rti800_board boardtypes[] = {
 	{"rti800", 0},
 	{"rti815", 1},
 };

 #define this_board ((const struct rti800_board *)dev->board_ptr)

 static int rti800_attach(struct comedi_device *dev,
 			 struct comedi_devconfig *it);
 static int rti800_detach(struct comedi_device *dev);
 static struct comedi_driver driver_rti800 = {
 	.driver_name = "rti800",
 	.module = THIS_MODULE,
 	.attach = rti800_attach,
 	.detach = rti800_detach,
 	.num_names = ARRAY_SIZE(boardtypes),
 	.board_name = &boardtypes[0].name,
 	.offset = sizeof(struct rti800_board),
 };

 COMEDI_INITCLEANUP(driver_rti800);

 static irqreturn_t rti800_interrupt(int irq, void *dev);

 struct rti800_private {
 	enum {
 		adc_diff, adc_pseudodiff, adc_singleended
 	} adc_mux;
 	enum {
 		adc_bipolar10, adc_bipolar5, adc_unipolar10
 	} adc_range;
 	enum {
 		adc_2comp, adc_straight
 	} adc_coding;
 	enum {
 		dac_bipolar10, dac_unipolar10
 	} dac0_range, dac1_range;
 	enum {
 		dac_2comp, dac_straight
 	} dac0_coding, dac1_coding;
 	const struct comedi_lrange *ao_range_type_list[2];
 	unsigned int ao_readback[2];
 	int muxgain_bits;
 };

 #define devpriv ((struct rti800_private *)dev->private)

 #define RTI800_TIMEOUT 100

 static irqreturn_t rti800_interrupt(int irq, void *dev)
 {
 	return IRQ_HANDLED;
 }

 /* settling delay times in usec for different gains */
 static const int gaindelay[] = { 10, 20, 40, 80 };

 static int rti800_ai_insn_read(struct comedi_device *dev,
 			       struct comedi_subdevice *s,
 			       struct comedi_insn *insn, unsigned int *data)
 {
 	int i, t;
 	int status;
 	int chan = CR_CHAN(insn->chanspec);
 	unsigned gain = CR_RANGE(insn->chanspec);
 	unsigned muxgain_bits;

 	inb(dev->iobase + RTI800_ADCHI);
 	outb(0, dev->iobase + RTI800_CLRFLAGS);

 	muxgain_bits = chan | (gain << 5);
 	if (muxgain_bits != devpriv->muxgain_bits) {
 		devpriv->muxgain_bits = muxgain_bits;
 		outb(devpriv->muxgain_bits, dev->iobase + RTI800_MUXGAIN);
 		/* without a delay here, the RTI_OVERRUN bit
 		 * gets set, and you will have an error. */
 		if (insn->n > 0) {
 			BUG_ON(gain >= ARRAY_SIZE(gaindelay));
 			udelay(gaindelay[gain]);
 		}
 	}

 	for (i = 0; i < insn->n; i++) {
 		outb(0, dev->iobase + RTI800_CONVERT);
 		for (t = RTI800_TIMEOUT; t; t--) {
 			status = inb(dev->iobase + RTI800_CSR);
 			if (status & RTI800_OVERRUN) {
 				printk(KERN_WARNING "rti800: a/d overrun\n");
 				outb(0, dev->iobase + RTI800_CLRFLAGS);
 				return -EIO;
 			}
 			if (status & RTI800_DONE)
 				break;
 			udelay(1);
 		}
 		if (t == 0) {
 			printk(KERN_WARNING "rti800: timeout\n");
 			return -ETIME;
 		}
 		data[i] = inb(dev->iobase + RTI800_ADCLO);
 		data[i] |= (0xf & inb(dev->iobase + RTI800_ADCHI)) << 8;

 		if (devpriv->adc_coding == adc_2comp)
 			data[i] ^= 0x800;
 	}

 	return i;
 }

 static int rti800_ao_insn_read(struct comedi_device *dev,
 			       struct comedi_subdevice *s,
 			       struct comedi_insn *insn, unsigned int *data)
 {
 	int i;
 	int chan = CR_CHAN(insn->chanspec);

 	for (i = 0; i < insn->n; i++)
 		data[i] = devpriv->ao_readback[chan];

 	return i;
 }

 static int rti800_ao_insn_write(struct comedi_device *dev,
 				struct comedi_subdevice *s,
 				struct comedi_insn *insn, unsigned int *data)
 {
 	int chan = CR_CHAN(insn->chanspec);
 	int d;
 	int i;

 	for (i = 0; i < insn->n; i++) {
 		devpriv->ao_readback[chan] = d = data[i];
 		if (devpriv->dac0_coding == dac_2comp)
 			d ^= 0x800;

 		outb(d & 0xff,
 		     dev->iobase + (chan ? RTI800_DAC1LO : RTI800_DAC0LO));
 		outb(d >> 8,
 		     dev->iobase + (chan ? RTI800_DAC1HI : RTI800_DAC0HI));
 	}
 	return i;
 }

 static int rti800_di_insn_bits(struct comedi_device *dev,
 			       struct comedi_subdevice *s,
 			       struct comedi_insn *insn, unsigned int *data)
 {
 	if (insn->n != 2)
 		return -EINVAL;
 	data[1] = inb(dev->iobase + RTI800_DI);
 	return 2;
 }

 static int rti800_do_insn_bits(struct comedi_device *dev,
 			       struct comedi_subdevice *s,
 			       struct comedi_insn *insn, unsigned int *data)
 {
 	if (insn->n != 2)
 		return -EINVAL;

 	if (data[0]) {
 		s->state &= ~data[0];
 		s->state |= data[0] & data[1];
 		/* Outputs are inverted... */
 		outb(s->state ^ 0xff, dev->iobase + RTI800_DO);
 	}

 	data[1] = s->state;

 	return 2;
 }

 /*
    options[0] - I/O port
    options[1] - irq
    options[2] - a/d mux
 	0=differential, 1=pseudodiff, 2=single
    options[3] - a/d range
 	0=bipolar10, 1=bipolar5, 2=unipolar10
    options[4] - a/d coding
 	0=2's comp, 1=straight binary
    options[5] - dac0 range
 	0=bipolar10, 1=unipolar10
    options[6] - dac0 coding
 	0=2's comp, 1=straight binary
    options[7] - dac1 range
    options[8] - dac1 coding
  */

 static int rti800_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 {
 	unsigned int irq;
 	unsigned long iobase;
 	int ret;
 	struct comedi_subdevice *s;

 	iobase = it->options[0];
 	printk(KERN_INFO "comedi%d: rti800: 0x%04lx\n", dev->minor, iobase);
 	if (!request_region(iobase, RTI800_SIZE, "rti800")) {
 		printk(KERN_WARNING "I/O port conflict\n");
 		return -EIO;
 	}
 	dev->iobase = iobase;

 #ifdef DEBUG
 	printk(KERN_DEBUG "fingerprint=%x,%x,%x,%x,%x ",
 	       inb(dev->iobase + 0),
 	       inb(dev->iobase + 1),
 	       inb(dev->iobase + 2),
 	       inb(dev->iobase + 3), inb(dev->iobase + 4));
 #endif

 	outb(0, dev->iobase + RTI800_CSR);
 	inb(dev->iobase + RTI800_ADCHI);
 	outb(0, dev->iobase + RTI800_CLRFLAGS);

 	irq = it->options[1];
 	if (irq) {
 		printk(KERN_INFO "( irq = %u )\n", irq);
 		ret = request_irq(irq, rti800_interrupt, 0, "rti800", dev);
 		if (ret < 0) {
 			printk(KERN_WARNING " Failed to allocate IRQ\n");
 			return ret;
 		}
 		dev->irq = irq;
 	} else {
 		printk(KERN_INFO "( no irq )\n");
 	}

 	dev->board_name = this_board->name;

 	ret = alloc_subdevices(dev, 4);
 	if (ret < 0)
 		return ret;

 	ret = alloc_private(dev, sizeof(struct rti800_private));
 	if (ret < 0)
 		return ret;

 	devpriv->adc_mux = it->options[2];
 	devpriv->adc_range = it->options[3];
 	devpriv->adc_coding = it->options[4];
 	devpriv->dac0_range = it->options[5];
 	devpriv->dac0_coding = it->options[6];
 	devpriv->dac1_range = it->options[7];
 	devpriv->dac1_coding = it->options[8];
 	devpriv->muxgain_bits = -1;

 	s = dev->subdevices + 0;
 	/* ai subdevice */
 	s->type = COMEDI_SUBD_AI;
 	s->subdev_flags = SDF_READABLE | SDF_GROUND;
 	s->n_chan = (devpriv->adc_mux ? 16 : 8);
 	s->insn_read = rti800_ai_insn_read;
 	s->maxdata = 0xfff;
 	switch (devpriv->adc_range) {
 	case adc_bipolar10:
 		s->range_table = &range_rti800_ai_10_bipolar;
 		break;
 	case adc_bipolar5:
 		s->range_table = &range_rti800_ai_5_bipolar;
 		break;
 	case adc_unipolar10:
 		s->range_table = &range_rti800_ai_unipolar;
 		break;
 	}

 	s++;
 	if (this_board->has_ao) {
 		/* ao subdevice (only on rti815) */
 		s->type = COMEDI_SUBD_AO;
 		s->subdev_flags = SDF_WRITABLE;
 		s->n_chan = 2;
 		s->insn_read = rti800_ao_insn_read;
 		s->insn_write = rti800_ao_insn_write;
 		s->maxdata = 0xfff;
 		s->range_table_list = devpriv->ao_range_type_list;
 		switch (devpriv->dac0_range) {
 		case dac_bipolar10:
 			devpriv->ao_range_type_list[0] = &range_bipolar10;
 			break;
 		case dac_unipolar10:
 			devpriv->ao_range_type_list[0] = &range_unipolar10;
 			break;
 		}
 		switch (devpriv->dac1_range) {
 		case dac_bipolar10:
 			devpriv->ao_range_type_list[1] = &range_bipolar10;
 			break;
 		case dac_unipolar10:
 			devpriv->ao_range_type_list[1] = &range_unipolar10;
 			break;
 		}
 	} else {
 		s->type = COMEDI_SUBD_UNUSED;
 	}

 	s++;
 	/* di */
 	s->type = COMEDI_SUBD_DI;
 	s->subdev_flags = SDF_READABLE;
 	s->n_chan = 8;
 	s->insn_bits = rti800_di_insn_bits;
 	s->maxdata = 1;
 	s->range_table = &range_digital;

 	s++;
 	/* do */
 	s->type = COMEDI_SUBD_DO;
 	s->subdev_flags = SDF_WRITABLE;
 	s->n_chan = 8;
 	s->insn_bits = rti800_do_insn_bits;
 	s->maxdata = 1;
 	s->range_table = &range_digital;

 /* don't yet know how to deal with counter/timers */
 #if 0
 	s++;
 	/* do */
 	s->type = COMEDI_SUBD_TIMER;
 #endif

 	return 0;
 }

 static int rti800_detach(struct comedi_device *dev)
 {
 	printk(KERN_INFO "comedi%d: rti800: remove\n", dev->minor);

 	if (dev->iobase)
 		release_region(dev->iobase, RTI800_SIZE);

 	if (dev->irq)
 		free_irq(dev->irq, dev);

 	return 0;
 }
	/*
	comedi/drivers/rti800.c
	Hardware driver for Analog Devices RTI-800/815 board

	COMEDI - Linux Control and Measurement Device Interface
	Copyright (C) 1998 David A. Schleef <ds@schleef.org>

	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.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

	*/
	/*
	Driver: rti800
	Description: Analog Devices RTI-800/815
	Author: ds
	Status: unknown
	Updated: Fri, 05 Sep 2008 14:50:44 +0100
	Devices: [Analog Devices] RTI-800 (rti800), RTI-815 (rti815)

	Configuration options:
	[0] - I/O port base address
	[1] - IRQ
	[2] - A/D reference
	0 = differential
	1 = pseudodifferential (common)
	2 = single-ended
	[3] - A/D range
	0 = [-10,10]
	1 = [-5,5]
	2 = [0,10]
	[4] - A/D encoding
	0 = two's complement
	1 = straight binary
	[5] - DAC 0 range
	0 = [-10,10]
	1 = [0,10]
	[6] - DAC 0 encoding
	0 = two's complement
	1 = straight binary
	[7] - DAC 1 range (same as DAC 0)
	[8] - DAC 1 encoding (same as DAC 0)
	*/

	#include <linux/interrupt.h>
	#include "../comedidev.h"

	#include <linux/ioport.h>

	#define RTI800_SIZE 16

	#define RTI800_CSR 0
	#define RTI800_MUXGAIN 1
	#define RTI800_CONVERT 2
	#define RTI800_ADCLO 3
	#define RTI800_ADCHI 4
	#define RTI800_DAC0LO 5
	#define RTI800_DAC0HI 6
	#define RTI800_DAC1LO 7
	#define RTI800_DAC1HI 8
	#define RTI800_CLRFLAGS 9
	#define RTI800_DI 10
	#define RTI800_DO 11
	#define RTI800_9513A_DATA 12
	#define RTI800_9513A_CNTRL 13
	#define RTI800_9513A_STATUS 13

	/*
	* flags for CSR register
	*/

	#define RTI800_BUSY 0x80
	#define RTI800_DONE 0x40
	#define RTI800_OVERRUN 0x20
	#define RTI800_TCR 0x10
	#define RTI800_DMA_ENAB 0x08
	#define RTI800_INTR_TC 0x04
	#define RTI800_INTR_EC 0x02
	#define RTI800_INTR_OVRN 0x01

	#define Am9513_8BITBUS

	#define Am9513_output_control(a) outb(a, dev->iobase+RTI800_9513A_CNTRL)
	#define Am9513_output_data(a) outb(a, dev->iobase+RTI800_9513A_DATA)
	#define Am9513_input_data() inb(dev->iobase+RTI800_9513A_DATA)
	#define Am9513_input_status() inb(dev->iobase+RTI800_9513A_STATUS)

	#include "am9513.h"

	static const struct comedi_lrange range_rti800_ai_10_bipolar = { 4, {
	BIP_RANGE
	(10),
	BIP_RANGE
	(1),
	BIP_RANGE
	(0.1),
	BIP_RANGE
	(0.02)
	}
	};

	static const struct comedi_lrange range_rti800_ai_5_bipolar = { 4, {
	BIP_RANGE
	(5),
	BIP_RANGE
	(0.5),
	BIP_RANGE
	(0.05),
	BIP_RANGE
	(0.01)
	}
	};

	static const struct comedi_lrange range_rti800_ai_unipolar = { 4, {
	UNI_RANGE
	(10),
	UNI_RANGE(1),
	UNI_RANGE
	(0.1),
	UNI_RANGE
	(0.02)
	}
	};

	struct rti800_board {

	const char *name;
	int has_ao;
	};

	static const struct rti800_board boardtypes[] = {
	{"rti800", 0},
	{"rti815", 1},
	};

	#define this_board ((const struct rti800_board *)dev->board_ptr)

	static int rti800_attach(struct comedi_device *dev,
	struct comedi_devconfig *it);
	static int rti800_detach(struct comedi_device *dev);
	static struct comedi_driver driver_rti800 = {
	.driver_name = "rti800",
	.module = THIS_MODULE,
	.attach = rti800_attach,
	.detach = rti800_detach,
	.num_names = ARRAY_SIZE(boardtypes),
	.board_name = &boardtypes[0].name,
	.offset = sizeof(struct rti800_board),
	};

	COMEDI_INITCLEANUP(driver_rti800);

	static irqreturn_t rti800_interrupt(int irq, void *dev);

	struct rti800_private {
	enum {
	adc_diff, adc_pseudodiff, adc_singleended
	} adc_mux;
	enum {
	adc_bipolar10, adc_bipolar5, adc_unipolar10
	} adc_range;
	enum {
	adc_2comp, adc_straight
	} adc_coding;
	enum {
	dac_bipolar10, dac_unipolar10
	} dac0_range, dac1_range;
	enum {
	dac_2comp, dac_straight
	} dac0_coding, dac1_coding;
	const struct comedi_lrange *ao_range_type_list[2];
	unsigned int ao_readback[2];
	int muxgain_bits;
	};

	#define devpriv ((struct rti800_private *)dev->private)

	#define RTI800_TIMEOUT 100

	static irqreturn_t rti800_interrupt(int irq, void *dev)
	{
	return IRQ_HANDLED;
	}

	/* settling delay times in usec for different gains */
	static const int gaindelay[] = { 10, 20, 40, 80 };

	static int rti800_ai_insn_read(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn insn, unsigned int data)
	{
	int i, t;
	int status;
	int chan = CR_CHAN(insn->chanspec);
	unsigned gain = CR_RANGE(insn->chanspec);
	unsigned muxgain_bits;

	inb(dev->iobase + RTI800_ADCHI);
	outb(0, dev->iobase + RTI800_CLRFLAGS);

	muxgain_bits = chan \| (gain << 5);
	if (muxgain_bits != devpriv->muxgain_bits) {
	devpriv->muxgain_bits = muxgain_bits;
	outb(devpriv->muxgain_bits, dev->iobase + RTI800_MUXGAIN);
	/* without a delay here, the RTI_OVERRUN bit
	* gets set, and you will have an error. */
	if (insn->n > 0) {
	BUG_ON(gain >= ARRAY_SIZE(gaindelay));
	udelay(gaindelay[gain]);
	}
	}

	for (i = 0; i < insn->n; i++) {
	outb(0, dev->iobase + RTI800_CONVERT);
	for (t = RTI800_TIMEOUT; t; t--) {
	status = inb(dev->iobase + RTI800_CSR);
	if (status & RTI800_OVERRUN) {
	printk(KERN_WARNING "rti800: a/d overrun\n");
	outb(0, dev->iobase + RTI800_CLRFLAGS);
	return -EIO;
	}
	if (status & RTI800_DONE)
	break;
	udelay(1);
	}
	if (t == 0) {
	printk(KERN_WARNING "rti800: timeout\n");
	return -ETIME;
	}
	data[i] = inb(dev->iobase + RTI800_ADCLO);
	data[i] \|= (0xf & inb(dev->iobase + RTI800_ADCHI)) << 8;

	if (devpriv->adc_coding == adc_2comp)
	data[i] ^= 0x800;
	}

	return i;
	}

	static int rti800_ao_insn_read(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn insn, unsigned int data)
	{
	int i;
	int chan = CR_CHAN(insn->chanspec);

	for (i = 0; i < insn->n; i++)
	data[i] = devpriv->ao_readback[chan];

	return i;
	}

	static int rti800_ao_insn_write(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn insn, unsigned int data)
	{
	int chan = CR_CHAN(insn->chanspec);
	int d;
	int i;

	for (i = 0; i < insn->n; i++) {
	devpriv->ao_readback[chan] = d = data[i];
	if (devpriv->dac0_coding == dac_2comp)
	d ^= 0x800;

	outb(d & 0xff,
	dev->iobase + (chan ? RTI800_DAC1LO : RTI800_DAC0LO));
	outb(d >> 8,
	dev->iobase + (chan ? RTI800_DAC1HI : RTI800_DAC0HI));
	}
	return i;
	}

	static int rti800_di_insn_bits(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn insn, unsigned int data)
	{
	if (insn->n != 2)
	return -EINVAL;
	data[1] = inb(dev->iobase + RTI800_DI);
	return 2;
	}

	static int rti800_do_insn_bits(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn insn, unsigned int data)
	{
	if (insn->n != 2)
	return -EINVAL;

	if (data[0]) {
	s->state &= ~data[0];
	s->state \|= data[0] & data[1];
	/* Outputs are inverted... */
	outb(s->state ^ 0xff, dev->iobase + RTI800_DO);
	}

	data[1] = s->state;

	return 2;
	}

	/*
	options[0] - I/O port
	options[1] - irq
	options[2] - a/d mux
	0=differential, 1=pseudodiff, 2=single
	options[3] - a/d range
	0=bipolar10, 1=bipolar5, 2=unipolar10
	options[4] - a/d coding
	0=2's comp, 1=straight binary
	options[5] - dac0 range
	0=bipolar10, 1=unipolar10
	options[6] - dac0 coding
	0=2's comp, 1=straight binary
	options[7] - dac1 range
	options[8] - dac1 coding
	*/

	static int rti800_attach(struct comedi_device dev, struct comedi_devconfig it)
	{
	unsigned int irq;
	unsigned long iobase;
	int ret;
	struct comedi_subdevice *s;

	iobase = it->options[0];
	printk(KERN_INFO "comedi%d: rti800: 0x%04lx\n", dev->minor, iobase);
	if (!request_region(iobase, RTI800_SIZE, "rti800")) {
	printk(KERN_WARNING "I/O port conflict\n");
	return -EIO;
	}
	dev->iobase = iobase;

	#ifdef DEBUG
	printk(KERN_DEBUG "fingerprint=%x,%x,%x,%x,%x ",
	inb(dev->iobase + 0),
	inb(dev->iobase + 1),
	inb(dev->iobase + 2),
	inb(dev->iobase + 3), inb(dev->iobase + 4));
	#endif

	outb(0, dev->iobase + RTI800_CSR);
	inb(dev->iobase + RTI800_ADCHI);
	outb(0, dev->iobase + RTI800_CLRFLAGS);

	irq = it->options[1];
	if (irq) {
	printk(KERN_INFO "( irq = %u )\n", irq);
	ret = request_irq(irq, rti800_interrupt, 0, "rti800", dev);
	if (ret < 0) {
	printk(KERN_WARNING " Failed to allocate IRQ\n");
	return ret;
	}
	dev->irq = irq;
	} else {
	printk(KERN_INFO "( no irq )\n");
	}

	dev->board_name = this_board->name;

	ret = alloc_subdevices(dev, 4);
	if (ret < 0)
	return ret;

	ret = alloc_private(dev, sizeof(struct rti800_private));
	if (ret < 0)
	return ret;

	devpriv->adc_mux = it->options[2];
	devpriv->adc_range = it->options[3];
	devpriv->adc_coding = it->options[4];
	devpriv->dac0_range = it->options[5];
	devpriv->dac0_coding = it->options[6];
	devpriv->dac1_range = it->options[7];
	devpriv->dac1_coding = it->options[8];
	devpriv->muxgain_bits = -1;

	s = dev->subdevices + 0;
	/* ai subdevice */
	s->type = COMEDI_SUBD_AI;
	s->subdev_flags = SDF_READABLE \| SDF_GROUND;
	s->n_chan = (devpriv->adc_mux ? 16 : 8);
	s->insn_read = rti800_ai_insn_read;
	s->maxdata = 0xfff;
	switch (devpriv->adc_range) {
	case adc_bipolar10:
	s->range_table = &range_rti800_ai_10_bipolar;
	break;
	case adc_bipolar5:
	s->range_table = &range_rti800_ai_5_bipolar;
	break;
	case adc_unipolar10:
	s->range_table = &range_rti800_ai_unipolar;
	break;
	}

	s++;
	if (this_board->has_ao) {
	/* ao subdevice (only on rti815) */
	s->type = COMEDI_SUBD_AO;
	s->subdev_flags = SDF_WRITABLE;
	s->n_chan = 2;
	s->insn_read = rti800_ao_insn_read;
	s->insn_write = rti800_ao_insn_write;
	s->maxdata = 0xfff;
	s->range_table_list = devpriv->ao_range_type_list;
	switch (devpriv->dac0_range) {
	case dac_bipolar10:
	devpriv->ao_range_type_list[0] = &range_bipolar10;
	break;
	case dac_unipolar10:
	devpriv->ao_range_type_list[0] = &range_unipolar10;
	break;
	}
	switch (devpriv->dac1_range) {
	case dac_bipolar10:
	devpriv->ao_range_type_list[1] = &range_bipolar10;
	break;
	case dac_unipolar10:
	devpriv->ao_range_type_list[1] = &range_unipolar10;
	break;
	}
	} else {
	s->type = COMEDI_SUBD_UNUSED;
	}

	s++;
	/* di */
	s->type = COMEDI_SUBD_DI;
	s->subdev_flags = SDF_READABLE;
	s->n_chan = 8;
	s->insn_bits = rti800_di_insn_bits;
	s->maxdata = 1;
	s->range_table = &range_digital;

	s++;
	/* do */
	s->type = COMEDI_SUBD_DO;
	s->subdev_flags = SDF_WRITABLE;
	s->n_chan = 8;
	s->insn_bits = rti800_do_insn_bits;
	s->maxdata = 1;
	s->range_table = &range_digital;

	/* don't yet know how to deal with counter/timers */
	#if 0
	s++;
	/* do */
	s->type = COMEDI_SUBD_TIMER;
	#endif

	return 0;
	}

	static int rti800_detach(struct comedi_device *dev)
	{
	printk(KERN_INFO "comedi%d: rti800: remove\n", dev->minor);

	if (dev->iobase)
	release_region(dev->iobase, RTI800_SIZE);

	if (dev->irq)
	free_irq(dev->irq, dev);

	return 0;
	}