/*
    comedi/drivers/pcl726.c

    hardware driver for Advantech cards:
     card:   PCL-726, PCL-727, PCL-728
     driver: pcl726,  pcl727,  pcl728
    and for ADLink cards:
     card:   ACL-6126, ACL-6128
     driver: acl6126,  acl6128

    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: pcl726
Description: Advantech PCL-726 & compatibles
Author: ds
Status: untested
Devices: [Advantech] PCL-726 (pcl726), PCL-727 (pcl727), PCL-728 (pcl728),
  [ADLink] ACL-6126 (acl6126), ACL-6128 (acl6128)

Interrupts are not supported.

    Options for PCL-726:
     [0] - IO Base
     [2]...[7] - D/A output range for channel 1-6:
		0: 0-5V, 1: 0-10V, 2: +/-5V, 3: +/-10V,
		4: 4-20mA, 5: unknown (external reference)

    Options for PCL-727:
     [0] - IO Base
     [2]...[13] - D/A output range for channel 1-12:
		0: 0-5V, 1: 0-10V, 2: +/-5V,
		3: 4-20mA

    Options for PCL-728 and ACL-6128:
     [0] - IO Base
     [2], [3] - D/A output range for channel 1 and 2:
		0: 0-5V, 1: 0-10V, 2: +/-5V, 3: +/-10V,
		4: 4-20mA, 5: 0-20mA

    Options for ACL-6126:
     [0] - IO Base
     [1] - IRQ (0=disable, 3, 5, 6, 7, 9, 10, 11, 12, 15) (currently ignored)
     [2]...[7] - D/A output range for channel 1-6:
		0: 0-5V, 1: 0-10V, 2: +/-5V, 3: +/-10V,
		4: 4-20mA
*/

/*
    Thanks to Circuit Specialists for having programming info (!) on
    their web page.  (http://www.cir.com/)
*/

#include "../comedidev.h"

#include <linux/ioport.h>

#undef ACL6126_IRQ		/* no interrupt support (yet) */

#define PCL726_SIZE 16
#define PCL727_SIZE 32
#define PCL728_SIZE 8

#define PCL726_DAC0_HI 0
#define PCL726_DAC0_LO 1

#define PCL726_DO_HI 12
#define PCL726_DO_LO 13
#define PCL726_DI_HI 14
#define PCL726_DI_LO 15

#define PCL727_DO_HI 24
#define PCL727_DO_LO 25
#define PCL727_DI_HI  0
#define PCL727_DI_LO  1

static const struct comedi_lrange *const rangelist_726[] = {
	&range_unipolar5, &range_unipolar10,
	&range_bipolar5, &range_bipolar10,
	&range_4_20mA, &range_unknown
};

static const struct comedi_lrange *const rangelist_727[] = {
	&range_unipolar5, &range_unipolar10,
	&range_bipolar5,
	&range_4_20mA
};

static const struct comedi_lrange *const rangelist_728[] = {
	&range_unipolar5, &range_unipolar10,
	&range_bipolar5, &range_bipolar10,
	&range_4_20mA, &range_0_20mA
};

struct pcl726_board {

	const char *name;	/*  driver name */
	int n_aochan;		/*  num of D/A chans */
	int num_of_ranges;	/*  num of ranges */
	unsigned int IRQbits;	/*  allowed interrupts */
	unsigned int io_range;	/*  len of IO space */
	char have_dio;		/*  1=card have DI/DO ports */
	int di_hi;		/*  ports for DI/DO operations */
	int di_lo;
	int do_hi;
	int do_lo;
	const struct comedi_lrange *const *range_type_list;
	/*  list of supported ranges */
};

static const struct pcl726_board boardtypes[] = {
	{"pcl726", 6, 6, 0x0000, PCL726_SIZE, 1,
	 PCL726_DI_HI, PCL726_DI_LO, PCL726_DO_HI, PCL726_DO_LO,
	 &rangelist_726[0],},
	{"pcl727", 12, 4, 0x0000, PCL727_SIZE, 1,
	 PCL727_DI_HI, PCL727_DI_LO, PCL727_DO_HI, PCL727_DO_LO,
	 &rangelist_727[0],},
	{"pcl728", 2, 6, 0x0000, PCL728_SIZE, 0,
	 0, 0, 0, 0,
	 &rangelist_728[0],},
	{"acl6126", 6, 5, 0x96e8, PCL726_SIZE, 1,
	 PCL726_DI_HI, PCL726_DI_LO, PCL726_DO_HI, PCL726_DO_LO,
	 &rangelist_726[0],},
	{"acl6128", 2, 6, 0x0000, PCL728_SIZE, 0,
	 0, 0, 0, 0,
	 &rangelist_728[0],},
};

struct pcl726_private {

	int bipolar[12];
	const struct comedi_lrange *rangelist[12];
	unsigned int ao_readback[12];
};

static int pcl726_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s,
			  struct comedi_insn *insn, unsigned int *data)
{
	struct pcl726_private *devpriv = dev->private;
	int hi, lo;
	int n;
	int chan = CR_CHAN(insn->chanspec);

	for (n = 0; n < insn->n; n++) {
		lo = data[n] & 0xff;
		hi = (data[n] >> 8) & 0xf;
		if (devpriv->bipolar[chan])
			hi ^= 0x8;
		/*
		 * the programming info did not say which order
		 * to write bytes.  switch the order of the next
		 * two lines if you get glitches.
		 */
		outb(hi, dev->iobase + PCL726_DAC0_HI + 2 * chan);
		outb(lo, dev->iobase + PCL726_DAC0_LO + 2 * chan);
		devpriv->ao_readback[chan] = data[n];
	}

	return n;
}

static int pcl726_ao_insn_read(struct comedi_device *dev,
			       struct comedi_subdevice *s,
			       struct comedi_insn *insn, unsigned int *data)
{
	struct pcl726_private *devpriv = dev->private;
	int chan = CR_CHAN(insn->chanspec);
	int n;

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

static int pcl726_di_insn_bits(struct comedi_device *dev,
			       struct comedi_subdevice *s,
			       struct comedi_insn *insn, unsigned int *data)
{
	const struct pcl726_board *board = comedi_board(dev);

	data[1] = inb(dev->iobase + board->di_lo) |
	    (inb(dev->iobase + board->di_hi) << 8);

	return insn->n;
}

static int pcl726_do_insn_bits(struct comedi_device *dev,
			       struct comedi_subdevice *s,
			       struct comedi_insn *insn, unsigned int *data)
{
	const struct pcl726_board *board = comedi_board(dev);

	if (data[0]) {
		s->state &= ~data[0];
		s->state |= data[0] & data[1];
	}
	if (data[1] & 0x00ff)
		outb(s->state & 0xff, dev->iobase + board->do_lo);
	if (data[1] & 0xff00)
		outb((s->state >> 8), dev->iobase + board->do_hi);

	data[1] = s->state;

	return insn->n;
}

static int pcl726_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
	const struct pcl726_board *board = comedi_board(dev);
	struct pcl726_private *devpriv;
	struct comedi_subdevice *s;
	int ret, i;
#ifdef ACL6126_IRQ
	unsigned int irq;
#endif

	ret = comedi_request_region(dev, it->options[0], board->io_range);
	if (ret)
		return ret;

	devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
	if (!devpriv)
		return -ENOMEM;
	dev->private = devpriv;

	for (i = 0; i < 12; i++) {
		devpriv->bipolar[i] = 0;
		devpriv->rangelist[i] = &range_unknown;
	}

#ifdef ACL6126_IRQ
	irq = 0;
	if (boardtypes[board].IRQbits != 0) {	/* board support IRQ */
		irq = it->options[1];
		devpriv->first_chan = 2;
		if (irq) {	/* we want to use IRQ */
			if (((1 << irq) & boardtypes[board].IRQbits) == 0) {
				printk(KERN_WARNING
					", IRQ %d is out of allowed range,"
					" DISABLING IT", irq);
				irq = 0;	/* Bad IRQ */
			} else {
				if (request_irq(irq, interrupt_pcl818, 0,
						dev->board_name, dev)) {
					printk(KERN_WARNING
						", unable to allocate IRQ %d,"
						" DISABLING IT", irq);
					irq = 0;	/* Can't use IRQ */
				} else {
					printk(", irq=%d", irq);
				}
			}
		}
	}

	dev->irq = irq;
#endif

	printk("\n");

	ret = comedi_alloc_subdevices(dev, 3);
	if (ret)
		return ret;

	s = &dev->subdevices[0];
	/* ao */
	s->type = COMEDI_SUBD_AO;
	s->subdev_flags = SDF_WRITABLE | SDF_GROUND;
	s->n_chan = board->n_aochan;
	s->maxdata = 0xfff;
	s->len_chanlist = 1;
	s->insn_write = pcl726_ao_insn;
	s->insn_read = pcl726_ao_insn_read;
	s->range_table_list = devpriv->rangelist;
	for (i = 0; i < board->n_aochan; i++) {
		int j;

		j = it->options[2 + 1];
		if ((j < 0) || (j >= board->num_of_ranges)) {
			printk
			    ("Invalid range for channel %d! Must be 0<=%d<%d\n",
			     i, j, board->num_of_ranges - 1);
			j = 0;
		}
		devpriv->rangelist[i] = board->range_type_list[j];
		if (devpriv->rangelist[i]->range[0].min ==
		    -devpriv->rangelist[i]->range[0].max)
			devpriv->bipolar[i] = 1;	/* bipolar range */
	}

	s = &dev->subdevices[1];
	/* di */
	if (!board->have_dio) {
		s->type = COMEDI_SUBD_UNUSED;
	} else {
		s->type = COMEDI_SUBD_DI;
		s->subdev_flags = SDF_READABLE | SDF_GROUND;
		s->n_chan = 16;
		s->maxdata = 1;
		s->len_chanlist = 1;
		s->insn_bits = pcl726_di_insn_bits;
		s->range_table = &range_digital;
	}

	s = &dev->subdevices[2];
	/* do */
	if (!board->have_dio) {
		s->type = COMEDI_SUBD_UNUSED;
	} else {
		s->type = COMEDI_SUBD_DO;
		s->subdev_flags = SDF_WRITABLE | SDF_GROUND;
		s->n_chan = 16;
		s->maxdata = 1;
		s->len_chanlist = 1;
		s->insn_bits = pcl726_do_insn_bits;
		s->range_table = &range_digital;
	}

	return 0;
}

static struct comedi_driver pcl726_driver = {
	.driver_name	= "pcl726",
	.module		= THIS_MODULE,
	.attach		= pcl726_attach,
	.detach		= comedi_legacy_detach,
	.board_name	= &boardtypes[0].name,
	.num_names	= ARRAY_SIZE(boardtypes),
	.offset		= sizeof(struct pcl726_board),
};
module_comedi_driver(pcl726_driver);

MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");