// SPDX-License-Identifier: GPL-2.0+
/*
 * addi_apci_1516.c
 * Copyright (C) 2004,2005  ADDI-DATA GmbH for the source code of this module.
 * Project manager: Eric Stolz
 *
 *	ADDI-DATA GmbH
 *	Dieselstrasse 3
 *	D-77833 Ottersweier
 *	Tel: +19(0)7223/9493-0
 *	Fax: +49(0)7223/9493-92
 *	http://www.addi-data.com
 *	info@addi-data.com
 */

#include <linux/module.h>
#include <linux/comedi/comedi_pci.h>

#include "addi_watchdog.h"

/*
 * PCI bar 1 I/O Register map - Digital input/output
 */
#define APCI1516_DI_REG			0x00
#define APCI1516_DO_REG			0x04

/*
 * PCI bar 2 I/O Register map - Watchdog (APCI-1516 and APCI-2016)
 */
#define APCI1516_WDOG_REG		0x00

enum apci1516_boardid {
	BOARD_APCI1016,
	BOARD_APCI1516,
	BOARD_APCI2016,
};

struct apci1516_boardinfo {
	const char *name;
	int di_nchan;
	int do_nchan;
	int has_wdog;
};

static const struct apci1516_boardinfo apci1516_boardtypes[] = {
	[BOARD_APCI1016] = {
		.name		= "apci1016",
		.di_nchan	= 16,
	},
	[BOARD_APCI1516] = {
		.name		= "apci1516",
		.di_nchan	= 8,
		.do_nchan	= 8,
		.has_wdog	= 1,
	},
	[BOARD_APCI2016] = {
		.name		= "apci2016",
		.do_nchan	= 16,
		.has_wdog	= 1,
	},
};

struct apci1516_private {
	unsigned long wdog_iobase;
};

static int apci1516_di_insn_bits(struct comedi_device *dev,
				 struct comedi_subdevice *s,
				 struct comedi_insn *insn,
				 unsigned int *data)
{
	data[1] = inw(dev->iobase + APCI1516_DI_REG);

	return insn->n;
}

static int apci1516_do_insn_bits(struct comedi_device *dev,
				 struct comedi_subdevice *s,
				 struct comedi_insn *insn,
				 unsigned int *data)
{
	s->state = inw(dev->iobase + APCI1516_DO_REG);

	if (comedi_dio_update_state(s, data))
		outw(s->state, dev->iobase + APCI1516_DO_REG);

	data[1] = s->state;

	return insn->n;
}

static int apci1516_reset(struct comedi_device *dev)
{
	const struct apci1516_boardinfo *board = dev->board_ptr;
	struct apci1516_private *devpriv = dev->private;

	if (!board->has_wdog)
		return 0;

	outw(0x0, dev->iobase + APCI1516_DO_REG);

	addi_watchdog_reset(devpriv->wdog_iobase);

	return 0;
}

static int apci1516_auto_attach(struct comedi_device *dev,
				unsigned long context)
{
	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
	const struct apci1516_boardinfo *board = NULL;
	struct apci1516_private *devpriv;
	struct comedi_subdevice *s;
	int ret;

	if (context < ARRAY_SIZE(apci1516_boardtypes))
		board = &apci1516_boardtypes[context];
	if (!board)
		return -ENODEV;
	dev->board_ptr = board;
	dev->board_name = board->name;

	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
	if (!devpriv)
		return -ENOMEM;

	ret = comedi_pci_enable(dev);
	if (ret)
		return ret;

	dev->iobase = pci_resource_start(pcidev, 1);
	devpriv->wdog_iobase = pci_resource_start(pcidev, 2);

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

	/* Initialize the digital input subdevice */
	s = &dev->subdevices[0];
	if (board->di_nchan) {
		s->type		= COMEDI_SUBD_DI;
		s->subdev_flags	= SDF_READABLE;
		s->n_chan	= board->di_nchan;
		s->maxdata	= 1;
		s->range_table	= &range_digital;
		s->insn_bits	= apci1516_di_insn_bits;
	} else {
		s->type		= COMEDI_SUBD_UNUSED;
	}

	/* Initialize the digital output subdevice */
	s = &dev->subdevices[1];
	if (board->do_nchan) {
		s->type		= COMEDI_SUBD_DO;
		s->subdev_flags	= SDF_WRITABLE;
		s->n_chan	= board->do_nchan;
		s->maxdata	= 1;
		s->range_table	= &range_digital;
		s->insn_bits	= apci1516_do_insn_bits;
	} else {
		s->type		= COMEDI_SUBD_UNUSED;
	}

	/* Initialize the watchdog subdevice */
	s = &dev->subdevices[2];
	if (board->has_wdog) {
		ret = addi_watchdog_init(s, devpriv->wdog_iobase);
		if (ret)
			return ret;
	} else {
		s->type		= COMEDI_SUBD_UNUSED;
	}

	apci1516_reset(dev);
	return 0;
}

static void apci1516_detach(struct comedi_device *dev)
{
	if (dev->iobase)
		apci1516_reset(dev);
	comedi_pci_detach(dev);
}

static struct comedi_driver apci1516_driver = {
	.driver_name	= "addi_apci_1516",
	.module		= THIS_MODULE,
	.auto_attach	= apci1516_auto_attach,
	.detach		= apci1516_detach,
};

static int apci1516_pci_probe(struct pci_dev *dev,
			      const struct pci_device_id *id)
{
	return comedi_pci_auto_config(dev, &apci1516_driver, id->driver_data);
}

static const struct pci_device_id apci1516_pci_table[] = {
	{ PCI_VDEVICE(ADDIDATA, 0x1000), BOARD_APCI1016 },
	{ PCI_VDEVICE(ADDIDATA, 0x1001), BOARD_APCI1516 },
	{ PCI_VDEVICE(ADDIDATA, 0x1002), BOARD_APCI2016 },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, apci1516_pci_table);

static struct pci_driver apci1516_pci_driver = {
	.name		= "addi_apci_1516",
	.id_table	= apci1516_pci_table,
	.probe		= apci1516_pci_probe,
	.remove		= comedi_pci_auto_unconfig,
};
module_comedi_pci_driver(apci1516_driver, apci1516_pci_driver);

MODULE_DESCRIPTION("ADDI-DATA APCI-1016/1516/2016, 16 channel DIO boards");
MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_LICENSE("GPL");