pcl725.c

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/*
 * comedi/drivers/pcl725.c
 * Driver for PCL725 and clones
 * David A. Schleef
 */
/*
Driver: pcl725
Description: Advantech PCL-725 (& compatibles)
Author: ds
Status: unknown
Devices: [Advantech] PCL-725 (pcl725)
*/

#include "../comedidev.h"

#include <linux/ioport.h>

#define PCL725_SIZE 2

#define PCL725_DO 0
#define PCL725_DI 1

static int pcl725_do_insn(struct comedi_device *dev, struct comedi_subdevice *s,
              struct comedi_insn *insn, unsigned int *data)
{
    if (data[0]) {
        s->state &= ~data[0];
        s->state |= (data[0] & data[1]);
        outb(s->state, dev->iobase + PCL725_DO);
    }

    data[1] = s->state;

    return insn->n;
}

static int pcl725_di_insn(struct comedi_device *dev, struct comedi_subdevice *s,
              struct comedi_insn *insn, unsigned int *data)
{
    data[1] = inb(dev->iobase + PCL725_DI);

    return insn->n;
}

static int pcl725_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
    struct comedi_subdevice *s;
    unsigned long iobase;
    int ret;

    iobase = it->options[0];
    printk(KERN_INFO "comedi%d: pcl725: 0x%04lx ", dev->minor, iobase);
    if (!request_region(iobase, PCL725_SIZE, "pcl725")) {
        printk("I/O port conflict\n");
        return -EIO;
    }
    dev->board_name = "pcl725";
    dev->iobase = iobase;
    dev->irq = 0;

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

    s = &dev->subdevices[0];
    /* do */
    s->type = COMEDI_SUBD_DO;
    s->subdev_flags = SDF_WRITABLE;
    s->maxdata = 1;
    s->n_chan = 8;
    s->insn_bits = pcl725_do_insn;
    s->range_table = &range_digital;

    s = &dev->subdevices[1];
    /* di */
    s->type = COMEDI_SUBD_DI;
    s->subdev_flags = SDF_READABLE;
    s->maxdata = 1;
    s->n_chan = 8;
    s->insn_bits = pcl725_di_insn;
    s->range_table = &range_digital;

    printk(KERN_INFO "\n");

    return 0;
}

static void pcl725_detach(struct comedi_device *dev)
{
    if (dev->iobase)
        release_region(dev->iobase, PCL725_SIZE);
}

static struct comedi_driver pcl725_driver = {
    .driver_name    = "pcl725",
    .module     = THIS_MODULE,
    .attach     = pcl725_attach,
    .detach     = pcl725_detach,
};
module_comedi_driver(pcl725_driver);

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