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/*
 * COMEDI driver for the ADLINK PCI-723x/743x series boards.
 * Copyright (C) 2012 H Hartley Sweeten <hsweeten@visionengravers.com>
 *
 * Based on the adl_pci7230 driver written by:
 *	David Fernandez <dfcastelao@gmail.com>
 * and the adl_pci7432 driver written by:
 *	Michel Lachaine <mike@mikelachaine.ca>
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 2000 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.
 */

/*
 * Driver: adl_pci7x3x
 * Description: 32/64-Channel Isolated Digital I/O Boards
 * Devices: [ADLink] PCI-7230 (adl_pci7230), PCI-7233 (adl_pci7233),
 *   PCI-7234 (adl_pci7234), PCI-7432 (adl_pci7432), PCI-7433 (adl_pci7433),
 *   PCI-7434 (adl_pci7434)
 * Author: H Hartley Sweeten <hsweeten@visionengravers.com>
 * Updated: Thu, 02 Aug 2012 14:27:46 -0700
 * Status: untested
 *
 * One or two subdevices are setup by this driver depending on
 * the number of digital inputs and/or outputs provided by the
 * board. Each subdevice has a maximum of 32 channels.
 *
 *	PCI-7230 - 2 subdevices: 0 - 16 input, 1 - 16 output
 *	PCI-7233 - 1 subdevice: 0 - 32 input
 *	PCI-7234 - 1 subdevice: 0 - 32 output
 *	PCI-7432 - 2 subdevices: 0 - 32 input, 1 - 32 output
 *	PCI-7433 - 2 subdevices: 0 - 32 input, 1 - 32 input
 *	PCI-7434 - 2 subdevices: 0 - 32 output, 1 - 32 output
 *
 * The PCI-7230, PCI-7432 and PCI-7433 boards also support external
 * interrupt signals on digital input channels 0 and 1. The PCI-7233
 * has dual-interrupt sources for change-of-state (COS) on any 16
 * digital input channels of LSB and for COS on any 16 digital input
 * lines of MSB. Interrupts are not currently supported by this
 * driver.
 *
 * Configuration Options: not applicable, uses comedi PCI auto config
 */

#include <linux/module.h>

#include "../comedi_pci.h"

/*
 * Register I/O map (32-bit access only)
 */
#define PCI7X3X_DIO_REG		0x00
#define PCI743X_DIO_REG		0x04

enum apci1516_boardid {
	BOARD_PCI7230,
	BOARD_PCI7233,
	BOARD_PCI7234,
	BOARD_PCI7432,
	BOARD_PCI7433,
	BOARD_PCI7434,
};

struct adl_pci7x3x_boardinfo {
	const char *name;
	int nsubdevs;
	int di_nchan;
	int do_nchan;
};

static const struct adl_pci7x3x_boardinfo adl_pci7x3x_boards[] = {
	[BOARD_PCI7230] = {
		.name		= "adl_pci7230",
		.nsubdevs	= 2,
		.di_nchan	= 16,
		.do_nchan	= 16,
	},
	[BOARD_PCI7233] = {
		.name		= "adl_pci7233",
		.nsubdevs	= 1,
		.di_nchan	= 32,
	},
	[BOARD_PCI7234] = {
		.name		= "adl_pci7234",
		.nsubdevs	= 1,
		.do_nchan	= 32,
	},
	[BOARD_PCI7432] = {
		.name		= "adl_pci7432",
		.nsubdevs	= 2,
		.di_nchan	= 32,
		.do_nchan	= 32,
	},
	[BOARD_PCI7433] = {
		.name		= "adl_pci7433",
		.nsubdevs	= 2,
		.di_nchan	= 64,
	},
	[BOARD_PCI7434] = {
		.name		= "adl_pci7434",
		.nsubdevs	= 2,
		.do_nchan	= 64,
	}
};

static int adl_pci7x3x_do_insn_bits(struct comedi_device *dev,
				    struct comedi_subdevice *s,
				    struct comedi_insn *insn,
				    unsigned int *data)
{
	unsigned long reg = (unsigned long)s->private;

	if (comedi_dio_update_state(s, data)) {
		unsigned int val = s->state;

		if (s->n_chan == 16) {
			/*
			 * It seems the PCI-7230 needs the 16-bit DO state
			 * to be shifted left by 16 bits before being written
			 * to the 32-bit register.  Set the value in both
			 * halves of the register to be sure.
			 */
			val |= val << 16;
		}
		outl(val, dev->iobase + reg);
	}

	data[1] = s->state;

	return insn->n;
}

static int adl_pci7x3x_di_insn_bits(struct comedi_device *dev,
				    struct comedi_subdevice *s,
				    struct comedi_insn *insn,
				    unsigned int *data)
{
	unsigned long reg = (unsigned long)s->private;

	data[1] = inl(dev->iobase + reg);

	return insn->n;
}

static int adl_pci7x3x_auto_attach(struct comedi_device *dev,
				   unsigned long context)
{
	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
	const struct adl_pci7x3x_boardinfo *board = NULL;
	struct comedi_subdevice *s;
	int subdev;
	int nchan;
	int ret;

	if (context < ARRAY_SIZE(adl_pci7x3x_boards))
		board = &adl_pci7x3x_boards[context];
	if (!board)
		return -ENODEV;
	dev->board_ptr = board;
	dev->board_name = board->name;

	ret = comedi_pci_enable(dev);
	if (ret)
		return ret;
	dev->iobase = pci_resource_start(pcidev, 2);

	ret = comedi_alloc_subdevices(dev, board->nsubdevs);
	if (ret)
		return ret;

	subdev = 0;

	if (board->di_nchan) {
		nchan = min(board->di_nchan, 32);

		s = &dev->subdevices[subdev];
		/* Isolated digital inputs 0 to 15/31 */
		s->type		= COMEDI_SUBD_DI;
		s->subdev_flags	= SDF_READABLE;
		s->n_chan	= nchan;
		s->maxdata	= 1;
		s->insn_bits	= adl_pci7x3x_di_insn_bits;
		s->range_table	= &range_digital;

		s->private	= (void *)PCI7X3X_DIO_REG;

		subdev++;

		nchan = board->di_nchan - nchan;
		if (nchan) {
			s = &dev->subdevices[subdev];
			/* Isolated digital inputs 32 to 63 */
			s->type		= COMEDI_SUBD_DI;
			s->subdev_flags	= SDF_READABLE;
			s->n_chan	= nchan;
			s->maxdata	= 1;
			s->insn_bits	= adl_pci7x3x_di_insn_bits;
			s->range_table	= &range_digital;

			s->private	= (void *)PCI743X_DIO_REG;

			subdev++;
		}
	}

	if (board->do_nchan) {
		nchan = min(board->do_nchan, 32);

		s = &dev->subdevices[subdev];
		/* Isolated digital outputs 0 to 15/31 */
		s->type		= COMEDI_SUBD_DO;
		s->subdev_flags	= SDF_WRITABLE;
		s->n_chan	= nchan;
		s->maxdata	= 1;
		s->insn_bits	= adl_pci7x3x_do_insn_bits;
		s->range_table	= &range_digital;

		s->private	= (void *)PCI7X3X_DIO_REG;

		subdev++;

		nchan = board->do_nchan - nchan;
		if (nchan) {
			s = &dev->subdevices[subdev];
			/* Isolated digital outputs 32 to 63 */
			s->type		= COMEDI_SUBD_DO;
			s->subdev_flags	= SDF_WRITABLE;
			s->n_chan	= nchan;
			s->maxdata	= 1;
			s->insn_bits	= adl_pci7x3x_do_insn_bits;
			s->range_table	= &range_digital;

			s->private	= (void *)PCI743X_DIO_REG;

			subdev++;
		}
	}

	return 0;
}

static struct comedi_driver adl_pci7x3x_driver = {
	.driver_name	= "adl_pci7x3x",
	.module		= THIS_MODULE,
	.auto_attach	= adl_pci7x3x_auto_attach,
	.detach		= comedi_pci_detach,
};

static int adl_pci7x3x_pci_probe(struct pci_dev *dev,
				 const struct pci_device_id *id)
{
	return comedi_pci_auto_config(dev, &adl_pci7x3x_driver,
				      id->driver_data);
}

static const struct pci_device_id adl_pci7x3x_pci_table[] = {
	{ PCI_VDEVICE(ADLINK, 0x7230), BOARD_PCI7230 },
	{ PCI_VDEVICE(ADLINK, 0x7233), BOARD_PCI7233 },
	{ PCI_VDEVICE(ADLINK, 0x7234), BOARD_PCI7234 },
	{ PCI_VDEVICE(ADLINK, 0x7432), BOARD_PCI7432 },
	{ PCI_VDEVICE(ADLINK, 0x7433), BOARD_PCI7433 },
	{ PCI_VDEVICE(ADLINK, 0x7434), BOARD_PCI7434 },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, adl_pci7x3x_pci_table);

static struct pci_driver adl_pci7x3x_pci_driver = {
	.name		= "adl_pci7x3x",
	.id_table	= adl_pci7x3x_pci_table,
	.probe		= adl_pci7x3x_pci_probe,
	.remove		= comedi_pci_auto_unconfig,
};
module_comedi_pci_driver(adl_pci7x3x_driver, adl_pci7x3x_pci_driver);

MODULE_DESCRIPTION("ADLINK PCI-723x/743x Isolated Digital I/O boards");
MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
MODULE_LICENSE("GPL");