// SPDX-License-Identifier: GPL-2.0+
/*
 * Driver for Amplicon PCI263 relay board.
 *
 * Copyright (C) 2002 MEV Ltd. <https://www.mev.co.uk/>
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
 */

/*
 * Driver: amplc_pci263
 * Description: Amplicon PCI263
 * Author: Ian Abbott <abbotti@mev.co.uk>
 * Devices: [Amplicon] PCI263 (amplc_pci263)
 * Updated: Fri, 12 Apr 2013 15:19:36 +0100
 * Status: works
 *
 * Configuration options: not applicable, uses PCI auto config
 *
 * The board appears as one subdevice, with 16 digital outputs, each
 * connected to a reed-relay. Relay contacts are closed when output is 1.
 * The state of the outputs can be read.
 */

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

/* PCI263 registers */
#define PCI263_DO_0_7_REG       0x00
#define PCI263_DO_8_15_REG      0x01

static int pci263_do_insn_bits(struct comedi_device *dev,
                               struct comedi_subdevice *s,
                               struct comedi_insn *insn,
                               unsigned int *data)
{
        if (comedi_dio_update_state(s, data)) {
                outb(s->state & 0xff, dev->iobase + PCI263_DO_0_7_REG);
                outb((s->state >> 8) & 0xff, dev->iobase + PCI263_DO_8_15_REG);
        }

        data[1] = s->state;

        return insn->n;
}

static int pci263_auto_attach(struct comedi_device *dev,
                              unsigned long context_unused)
{
        struct pci_dev *pci_dev = comedi_to_pci_dev(dev);
        struct comedi_subdevice *s;
        int ret;

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

        dev->iobase = pci_resource_start(pci_dev, 2);
        ret = comedi_alloc_subdevices(dev, 1);
        if (ret)
                return ret;

        /* Digital Output subdevice */
        s = &dev->subdevices[0];
        s->type         = COMEDI_SUBD_DO;
        s->subdev_flags = SDF_WRITABLE;
        s->n_chan       = 16;
        s->maxdata      = 1;
        s->range_table  = &range_digital;
        s->insn_bits    = pci263_do_insn_bits;

        /* read initial relay state */
        s->state = inb(dev->iobase + PCI263_DO_0_7_REG) |
                   (inb(dev->iobase + PCI263_DO_8_15_REG) << 8);

        return 0;
}

static struct comedi_driver amplc_pci263_driver = {
        .driver_name    = "amplc_pci263",
        .module         = THIS_MODULE,
        .auto_attach    = pci263_auto_attach,
        .detach         = comedi_pci_detach,
};

static const struct pci_device_id pci263_pci_table[] = {
        { PCI_DEVICE(PCI_VENDOR_ID_AMPLICON, 0x000c) },
        {0}
};
MODULE_DEVICE_TABLE(pci, pci263_pci_table);

static int amplc_pci263_pci_probe(struct pci_dev *dev,
                                  const struct pci_device_id *id)
{
        return comedi_pci_auto_config(dev, &amplc_pci263_driver,
                                      id->driver_data);
}

static struct pci_driver amplc_pci263_pci_driver = {
        .name           = "amplc_pci263",
        .id_table       = pci263_pci_table,
        .probe          = &amplc_pci263_pci_probe,
        .remove         = comedi_pci_auto_unconfig,
};
module_comedi_pci_driver(amplc_pci263_driver, amplc_pci263_pci_driver);

MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi driver for Amplicon PCI263 relay board");
MODULE_LICENSE("GPL");