/*
    comedi/drivers/poc.c
    Mini-drivers for POC (Piece of Crap) boards
    Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net>
    Copyright (C) 2001 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: poc
Description: Generic driver for very simple devices
Author: ds
Devices: [Keithley Metrabyte] DAC-02 (dac02), [Advantech] PCL-733 (pcl733),
  PCL-734 (pcl734)
Updated: Sat, 16 Mar 2002 17:34:48 -0800
Status: unknown

This driver is indended to support very simple ISA-based devices,
including:
  dac02 - Keithley DAC-02 analog output board
  pcl733 - Advantech PCL-733
  pcl734 - Advantech PCL-734

Configuration options:
  [0] - I/O port base
*/

#include "../comedidev.h"

#include <linux/ioport.h>

static int poc_attach(struct comedi_device *dev, struct comedi_devconfig *it);
static int poc_detach(struct comedi_device *dev);
static int readback_insn(struct comedi_device *dev, struct comedi_subdevice *s,
			 struct comedi_insn *insn, unsigned int *data);

static int dac02_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
			  struct comedi_insn *insn, unsigned int *data);
static int pcl733_insn_bits(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data);
static int pcl734_insn_bits(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data);

struct boarddef_struct {
	const char *name;
	unsigned int iosize;
	int (*setup) (struct comedi_device *);
	int type;
	int n_chan;
	int n_bits;
	int (*winsn) (struct comedi_device *, struct comedi_subdevice *,
		      struct comedi_insn *, unsigned int *);
	int (*rinsn) (struct comedi_device *, struct comedi_subdevice *,
		      struct comedi_insn *, unsigned int *);
	int (*insnbits) (struct comedi_device *, struct comedi_subdevice *,
			 struct comedi_insn *, unsigned int *);
	const struct comedi_lrange *range;
};
static const struct boarddef_struct boards[] = {
	{
	 .name = "dac02",
	 .iosize = 8,
	 /*      .setup = dac02_setup, */
	 .type = COMEDI_SUBD_AO,
	 .n_chan = 2,
	 .n_bits = 12,
	 .winsn = dac02_ao_winsn,
	 .rinsn = readback_insn,
	 .range = &range_unknown,
	 },
	{
	 .name = "pcl733",
	 .iosize = 4,
	 .type = COMEDI_SUBD_DI,
	 .n_chan = 32,
	 .n_bits = 1,
	 .insnbits = pcl733_insn_bits,
	 .range = &range_digital,
	 },
	{
	 .name = "pcl734",
	 .iosize = 4,
	 .type = COMEDI_SUBD_DO,
	 .n_chan = 32,
	 .n_bits = 1,
	 .insnbits = pcl734_insn_bits,
	 .range = &range_digital,
	 },
};

#define n_boards ARRAY_SIZE(boards)
#define this_board ((const struct boarddef_struct *)dev->board_ptr)

static struct comedi_driver driver_poc = {
	.driver_name = "poc",
	.module = THIS_MODULE,
	.attach = poc_attach,
	.detach = poc_detach,
	.board_name = &boards[0].name,
	.num_names = n_boards,
	.offset = sizeof(boards[0]),
};

static int poc_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
	struct comedi_subdevice *s;
	unsigned long iobase;
	unsigned int iosize;

	iobase = it->options[0];
	printk(KERN_INFO "comedi%d: poc: using %s iobase 0x%lx\n", dev->minor,
	       this_board->name, iobase);

	dev->board_name = this_board->name;

	if (iobase == 0) {
		printk(KERN_ERR "io base address required\n");
		return -EINVAL;
	}

	iosize = this_board->iosize;
	/* check if io addresses are available */
	if (!request_region(iobase, iosize, "dac02")) {
		printk(KERN_ERR "I/O port conflict: failed to allocate ports "
			"0x%lx to 0x%lx\n", iobase, iobase + iosize - 1);
		return -EIO;
	}
	dev->iobase = iobase;

	if (alloc_subdevices(dev, 1) < 0)
		return -ENOMEM;
	if (alloc_private(dev, sizeof(unsigned int) * this_board->n_chan) < 0)
		return -ENOMEM;

	/* analog output subdevice */
	s = dev->subdevices + 0;
	s->type = this_board->type;
	s->n_chan = this_board->n_chan;
	s->maxdata = (1 << this_board->n_bits) - 1;
	s->range_table = this_board->range;
	s->insn_write = this_board->winsn;
	s->insn_read = this_board->rinsn;
	s->insn_bits = this_board->insnbits;
	if (s->type == COMEDI_SUBD_AO || s->type == COMEDI_SUBD_DO)
		s->subdev_flags = SDF_WRITABLE;

	return 0;
}

static int poc_detach(struct comedi_device *dev)
{
	/* only free stuff if it has been allocated by _attach */
	if (dev->iobase)
		release_region(dev->iobase, this_board->iosize);

	printk(KERN_INFO "comedi%d: dac02: remove\n", dev->minor);

	return 0;
}

static int readback_insn(struct comedi_device *dev, struct comedi_subdevice *s,
			 struct comedi_insn *insn, unsigned int *data)
{
	int chan;

	chan = CR_CHAN(insn->chanspec);
	data[0] = ((unsigned int *)dev->private)[chan];

	return 1;
}

/* DAC-02 registers */
#define DAC02_LSB(a)	(2 * a)
#define DAC02_MSB(a)	(2 * a + 1)

static int dac02_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
			  struct comedi_insn *insn, unsigned int *data)
{
	int temp;
	int chan;
	int output;

	chan = CR_CHAN(insn->chanspec);
	((unsigned int *)dev->private)[chan] = data[0];
	output = data[0];
#ifdef wrong
	/*  convert to complementary binary if range is bipolar */
	if ((CR_RANGE(insn->chanspec) & 0x2) == 0)
		output = ~output;
#endif
	temp = (output << 4) & 0xf0;
	outb(temp, dev->iobase + DAC02_LSB(chan));
	temp = (output >> 4) & 0xff;
	outb(temp, dev->iobase + DAC02_MSB(chan));

	return 1;
}

static int pcl733_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 + 0);
	data[1] |= (inb(dev->iobase + 1) << 8);
	data[1] |= (inb(dev->iobase + 2) << 16);
	data[1] |= (inb(dev->iobase + 3) << 24);

	return 2;
}

static int pcl734_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]);
		if ((data[0] >> 0) & 0xff)
			outb((s->state >> 0) & 0xff, dev->iobase + 0);
		if ((data[0] >> 8) & 0xff)
			outb((s->state >> 8) & 0xff, dev->iobase + 1);
		if ((data[0] >> 16) & 0xff)
			outb((s->state >> 16) & 0xff, dev->iobase + 2);
		if ((data[0] >> 24) & 0xff)
			outb((s->state >> 24) & 0xff, dev->iobase + 3);
	}
	data[1] = s->state;

	return 2;
}

static int __init driver_poc_init_module(void)
{
	return comedi_driver_register(&driver_poc);
}

static void __exit driver_poc_cleanup_module(void)
{
	comedi_driver_unregister(&driver_poc);
}

module_init(driver_poc_init_module);
module_exit(driver_poc_cleanup_module);

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