// SPDX-License-Identifier: GPL-2.0+
/*
 * fl512.c
 * Anders Gnistrup <ex18@kalman.iau.dtu.dk>
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
 */

/*
 * Driver: fl512
 * Description: unknown
 * Author: Anders Gnistrup <ex18@kalman.iau.dtu.dk>
 * Devices: [unknown] FL512 (fl512)
 * Status: unknown
 *
 * Digital I/O is not supported.
 *
 * Configuration options:
 *   [0] - I/O port base address
 */

#include <linux/module.h>
#include <linux/comedi/comedidev.h>
#include <linux/delay.h>

/*
 * Register I/O map
 */
#define FL512_AI_LSB_REG                0x02
#define FL512_AI_MSB_REG                0x03
#define FL512_AI_MUX_REG                0x02
#define FL512_AI_START_CONV_REG         0x03
#define FL512_AO_DATA_REG(x)            (0x04 + ((x) * 2))
#define FL512_AO_TRIG_REG(x)            (0x04 + ((x) * 2))

static const struct comedi_lrange range_fl512 = {
        4, {
                BIP_RANGE(0.5),
                BIP_RANGE(1),
                BIP_RANGE(5),
                BIP_RANGE(10),
                UNI_RANGE(1),
                UNI_RANGE(5),
                UNI_RANGE(10)
        }
};

static int fl512_ai_insn_read(struct comedi_device *dev,
                              struct comedi_subdevice *s,
                              struct comedi_insn *insn,
                              unsigned int *data)
{
        unsigned int chan = CR_CHAN(insn->chanspec);
        unsigned int val;
        int i;

        outb(chan, dev->iobase + FL512_AI_MUX_REG);

        for (i = 0; i < insn->n; i++) {
                outb(0, dev->iobase + FL512_AI_START_CONV_REG);

                /* XXX should test "done" flag instead of delay */
                usleep_range(30, 100);

                val = inb(dev->iobase + FL512_AI_LSB_REG);
                val |= (inb(dev->iobase + FL512_AI_MSB_REG) << 8);
                val &= s->maxdata;

                data[i] = val;
        }

        return insn->n;
}

static int fl512_ao_insn_write(struct comedi_device *dev,
                               struct comedi_subdevice *s,
                               struct comedi_insn *insn,
                               unsigned int *data)
{
        unsigned int chan = CR_CHAN(insn->chanspec);
        unsigned int val = s->readback[chan];
        int i;

        for (i = 0; i < insn->n; i++) {
                val = data[i];

                /* write LSB, MSB then trigger conversion */
                outb(val & 0x0ff, dev->iobase + FL512_AO_DATA_REG(chan));
                outb((val >> 8) & 0xf, dev->iobase + FL512_AO_DATA_REG(chan));
                inb(dev->iobase + FL512_AO_TRIG_REG(chan));
        }
        s->readback[chan] = val;

        return insn->n;
}

static int fl512_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
        struct comedi_subdevice *s;
        int ret;

        ret = comedi_request_region(dev, it->options[0], 0x10);
        if (ret)
                return ret;

        ret = comedi_alloc_subdevices(dev, 2);
        if (ret)
                return ret;

        /* Analog Input subdevice */
        s = &dev->subdevices[0];
        s->type         = COMEDI_SUBD_AI;
        s->subdev_flags = SDF_READABLE | SDF_GROUND;
        s->n_chan       = 16;
        s->maxdata      = 0x0fff;
        s->range_table  = &range_fl512;
        s->insn_read    = fl512_ai_insn_read;

        /* Analog Output subdevice */
        s = &dev->subdevices[1];
        s->type         = COMEDI_SUBD_AO;
        s->subdev_flags = SDF_WRITABLE;
        s->n_chan       = 2;
        s->maxdata      = 0x0fff;
        s->range_table  = &range_fl512;
        s->insn_write   = fl512_ao_insn_write;

        return comedi_alloc_subdev_readback(s);
}

static struct comedi_driver fl512_driver = {
        .driver_name    = "fl512",
        .module         = THIS_MODULE,
        .attach         = fl512_attach,
        .detach         = comedi_legacy_detach,
};
module_comedi_driver(fl512_driver);

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