// SPDX-License-Identifier: GPL-2.0+
/*
 * comedi/drivers/adl_pci8164.c
 *
 * Hardware comedi driver for PCI-8164 Adlink card
 * Copyright (C) 2004 Michel Lachine <mike@mikelachaine.ca>
 */

/*
 * Driver: adl_pci8164
 * Description: Driver for the Adlink PCI-8164 4 Axes Motion Control board
 * Devices: [ADLink] PCI-8164 (adl_pci8164)
 * Author: Michel Lachaine <mike@mikelachaine.ca>
 * Status: experimental
 * Updated: Mon, 14 Apr 2008 15:10:32 +0100
 *
 * Configuration Options: not applicable, uses PCI auto config
 */

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

#define PCI8164_AXIS(x)         ((x) * 0x08)
#define PCI8164_CMD_MSTS_REG    0x00
#define PCI8164_OTP_SSTS_REG    0x02
#define PCI8164_BUF0_REG        0x04
#define PCI8164_BUF1_REG        0x06

static int adl_pci8164_insn_read(struct comedi_device *dev,
                                 struct comedi_subdevice *s,
                                 struct comedi_insn *insn,
                                 unsigned int *data)
{
        unsigned long offset = (unsigned long)s->private;
        unsigned int chan = CR_CHAN(insn->chanspec);
        int i;

        for (i = 0; i < insn->n; i++)
                data[i] = inw(dev->iobase + PCI8164_AXIS(chan) + offset);

        return insn->n;
}

static int adl_pci8164_insn_write(struct comedi_device *dev,
                                  struct comedi_subdevice *s,
                                  struct comedi_insn *insn,
                                  unsigned int *data)
{
        unsigned long offset = (unsigned long)s->private;
        unsigned int chan = CR_CHAN(insn->chanspec);
        int i;

        for (i = 0; i < insn->n; i++)
                outw(data[i], dev->iobase + PCI8164_AXIS(chan) + offset);

        return insn->n;
}

static int adl_pci8164_auto_attach(struct comedi_device *dev,
                                   unsigned long context_unused)
{
        struct pci_dev *pcidev = 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(pcidev, 2);

        ret = comedi_alloc_subdevices(dev, 4);
        if (ret)
                return ret;

        /* read MSTS register / write CMD register for each axis (channel) */
        s = &dev->subdevices[0];
        s->type         = COMEDI_SUBD_PROC;
        s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
        s->n_chan       = 4;
        s->maxdata      = 0xffff;
        s->len_chanlist = 4;
        s->insn_read    = adl_pci8164_insn_read;
        s->insn_write   = adl_pci8164_insn_write;
        s->private      = (void *)PCI8164_CMD_MSTS_REG;

        /* read SSTS register / write OTP register for each axis (channel) */
        s = &dev->subdevices[1];
        s->type         = COMEDI_SUBD_PROC;
        s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
        s->n_chan       = 4;
        s->maxdata      = 0xffff;
        s->len_chanlist = 4;
        s->insn_read    = adl_pci8164_insn_read;
        s->insn_write   = adl_pci8164_insn_write;
        s->private      = (void *)PCI8164_OTP_SSTS_REG;

        /* read/write BUF0 register for each axis (channel) */
        s = &dev->subdevices[2];
        s->type         = COMEDI_SUBD_PROC;
        s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
        s->n_chan       = 4;
        s->maxdata      = 0xffff;
        s->len_chanlist = 4;
        s->insn_read    = adl_pci8164_insn_read;
        s->insn_write   = adl_pci8164_insn_write;
        s->private      = (void *)PCI8164_BUF0_REG;

        /* read/write BUF1 register for each axis (channel) */
        s = &dev->subdevices[3];
        s->type         = COMEDI_SUBD_PROC;
        s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
        s->n_chan       = 4;
        s->maxdata      = 0xffff;
        s->len_chanlist = 4;
        s->insn_read    = adl_pci8164_insn_read;
        s->insn_write   = adl_pci8164_insn_write;
        s->private      = (void *)PCI8164_BUF1_REG;

        return 0;
}

static struct comedi_driver adl_pci8164_driver = {
        .driver_name    = "adl_pci8164",
        .module         = THIS_MODULE,
        .auto_attach    = adl_pci8164_auto_attach,
        .detach         = comedi_pci_detach,
};

static int adl_pci8164_pci_probe(struct pci_dev *dev,
                                 const struct pci_device_id *id)
{
        return comedi_pci_auto_config(dev, &adl_pci8164_driver,
                                      id->driver_data);
}

static const struct pci_device_id adl_pci8164_pci_table[] = {
        { PCI_VDEVICE(ADLINK, 0x8164) },
        { }
};
MODULE_DEVICE_TABLE(pci, adl_pci8164_pci_table);

static struct pci_driver adl_pci8164_pci_driver = {
        .name           = "adl_pci8164",
        .id_table       = adl_pci8164_pci_table,
        .probe          = adl_pci8164_pci_probe,
        .remove         = comedi_pci_auto_unconfig,
};
module_comedi_pci_driver(adl_pci8164_driver, adl_pci8164_pci_driver);

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