acl7225b.c

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/*
 * comedi/drivers/acl7225b.c
 * Driver for Adlink NuDAQ ACL-7225b and clones
 * José Luis Sánchez
 */
/*
Driver: acl7225b
Description: Adlink NuDAQ ACL-7225b & compatibles
Author: José Luis Sánchez ([email protected])
Status: testing
Devices: [Adlink] ACL-7225b (acl7225b), [ICP] P16R16DIO (p16r16dio)
*/

#include "../comedidev.h"

#include <linux/ioport.h>

#define ACL7225_SIZE   8    /* Requires 8 ioports, but only 4 are used */
#define P16R16DIO_SIZE 4
#define ACL7225_RIO_LO 0    /* Relays input/output low byte (R0-R7) */
#define ACL7225_RIO_HI 1    /* Relays input/output high byte (R8-R15) */
#define ACL7225_DI_LO  2    /* Digital input low byte (DI0-DI7) */
#define ACL7225_DI_HI  3    /* Digital input high byte (DI8-DI15) */

struct boardtype {
    const char *name;   /*  driver name */
    int io_range;       /*  len of I/O space */
};

static int acl7225b_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]);
    }
    if (data[0] & 0x00ff)
        outb(s->state & 0xff, dev->iobase + (unsigned long)s->private);
    if (data[0] & 0xff00)
        outb((s->state >> 8),
             dev->iobase + (unsigned long)s->private + 1);

    data[1] = s->state;

    return insn->n;
}

static int acl7225b_di_insn(struct comedi_device *dev,
                struct comedi_subdevice *s,
                struct comedi_insn *insn, unsigned int *data)
{
    data[1] = inb(dev->iobase + (unsigned long)s->private) |
        (inb(dev->iobase + (unsigned long)s->private + 1) << 8);

    return insn->n;
}

static int acl7225b_attach(struct comedi_device *dev,
               struct comedi_devconfig *it)
{
    const struct boardtype *board = comedi_board(dev);
    struct comedi_subdevice *s;
    int iobase, iorange;
    int ret;

    iobase = it->options[0];
    iorange = board->io_range;
    printk(KERN_INFO "comedi%d: acl7225b: board=%s 0x%04x\n", dev->minor,
           board->name, iobase);
    if (!request_region(iobase, iorange, "acl7225b")) {
        printk(KERN_ERR "comedi%d: request_region failed - I/O port conflict\n",
            dev->minor);
        return -EIO;
    }
    dev->board_name = board->name;
    dev->iobase = iobase;
    dev->irq = 0;

    ret = comedi_alloc_subdevices(dev, 3);
    if (ret)
        return ret;

    s = &dev->subdevices[0];
    /* Relays outputs */
    s->type = COMEDI_SUBD_DO;
    s->subdev_flags = SDF_WRITABLE;
    s->maxdata = 1;
    s->n_chan = 16;
    s->insn_bits = acl7225b_do_insn;
    s->range_table = &range_digital;
    s->private = (void *)ACL7225_RIO_LO;

    s = &dev->subdevices[1];
    /* Relays status */
    s->type = COMEDI_SUBD_DI;
    s->subdev_flags = SDF_READABLE;
    s->maxdata = 1;
    s->n_chan = 16;
    s->insn_bits = acl7225b_di_insn;
    s->range_table = &range_digital;
    s->private = (void *)ACL7225_RIO_LO;

    s = &dev->subdevices[2];
    /* Isolated digital inputs */
    s->type = COMEDI_SUBD_DI;
    s->subdev_flags = SDF_READABLE;
    s->maxdata = 1;
    s->n_chan = 16;
    s->insn_bits = acl7225b_di_insn;
    s->range_table = &range_digital;
    s->private = (void *)ACL7225_DI_LO;

    return 0;
}

static void acl7225b_detach(struct comedi_device *dev)
{
    const struct boardtype *board = comedi_board(dev);

    if (dev->iobase)
        release_region(dev->iobase, board->io_range);
}

static const struct boardtype boardtypes[] = {
    { "acl7225b", ACL7225_SIZE, },
    { "p16r16dio", P16R16DIO_SIZE, },
};

static struct comedi_driver acl7225b_driver = {
    .driver_name    = "acl7225b",
    .module     = THIS_MODULE,
    .attach     = acl7225b_attach,
    .detach     = acl7225b_detach,
    .board_name = &boardtypes[0].name,
    .num_names  = ARRAY_SIZE(boardtypes),
    .offset     = sizeof(struct boardtype),
};
module_comedi_driver(acl7225b_driver);

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