// SPDX-License-Identifier: GPL-2.0+
/*
 * Driver for Amplicon PC263 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_pc263
 * Description: Amplicon PC263
 * Author: Ian Abbott <abbotti@mev.co.uk>
 * Devices: [Amplicon] PC263 (pc263)
 * Updated: Fri, 12 Apr 2013 15:19:36 +0100
 * Status: works
 *
 * Configuration options:
 *   [0] - I/O port base address
 *
 * 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/comedidev.h>

/* PC263 registers */
#define PC263_DO_0_7_REG        0x00
#define PC263_DO_8_15_REG       0x01

struct pc263_board {
        const char *name;
};

static const struct pc263_board pc263_boards[] = {
        {
                .name = "pc263",
        },
};

static int pc263_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 + PC263_DO_0_7_REG);
                outb((s->state >> 8) & 0xff, dev->iobase + PC263_DO_8_15_REG);
        }

        data[1] = s->state;

        return insn->n;
}

static int pc263_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
        struct comedi_subdevice *s;
        int ret;

        ret = comedi_request_region(dev, it->options[0], 0x2);
        if (ret)
                return ret;

        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    = pc263_do_insn_bits;

        /* read initial relay state */
        s->state = inb(dev->iobase + PC263_DO_0_7_REG) |
                   (inb(dev->iobase + PC263_DO_8_15_REG) << 8);

        return 0;
}

static struct comedi_driver amplc_pc263_driver = {
        .driver_name    = "amplc_pc263",
        .module         = THIS_MODULE,
        .attach         = pc263_attach,
        .detach         = comedi_legacy_detach,
        .board_name     = &pc263_boards[0].name,
        .offset         = sizeof(struct pc263_board),
        .num_names      = ARRAY_SIZE(pc263_boards),
};

module_comedi_driver(amplc_pc263_driver);

MODULE_AUTHOR("Comedi https://www.comedi.org");
MODULE_DESCRIPTION("Comedi driver for Amplicon PC263 relay board");
MODULE_LICENSE("GPL");