aio_iiro_16.c

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/*

    comedi/drivers/aio_iiro_16.c

    Driver for Access I/O Products PC-104 AIO-IIRO-16 Digital I/O board
    Copyright (C) 2006 C&C Technologies, Inc.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*

Driver: aio_iiro_16
Description: Access I/O Products PC-104 IIRO16 Relay And Isolated Input Board
Author: Zachary Ware <[email protected]>
Devices:
 [Access I/O] PC-104 AIO12-8
Status: experimental

Configuration Options:
  [0] - I/O port base address

*/

#include "../comedidev.h"
#include <linux/ioport.h>

#define AIO_IIRO_16_SIZE    0x08
#define AIO_IIRO_16_RELAY_0_7   0x00
#define AIO_IIRO_16_INPUT_0_7   0x01
#define AIO_IIRO_16_IRQ     0x02
#define AIO_IIRO_16_RELAY_8_15  0x04
#define AIO_IIRO_16_INPUT_8_15  0x05

struct aio_iiro_16_board {
    const char *name;
    int do_;
    int di;
};

static const struct aio_iiro_16_board aio_iiro_16_boards[] = {
    {
     .name = "aio_iiro_16",
     .di = 16,
     .do_ = 16},
};

static int aio_iiro_16_dio_insn_bits_write(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 & 0xff, dev->iobase + AIO_IIRO_16_RELAY_0_7);
        outb((s->state >> 8) & 0xff,
             dev->iobase + AIO_IIRO_16_RELAY_8_15);
    }

    data[1] = s->state;

    return insn->n;
}

static int aio_iiro_16_dio_insn_bits_read(struct comedi_device *dev,
                      struct comedi_subdevice *s,
                      struct comedi_insn *insn,
                      unsigned int *data)
{
    data[1] = 0;
    data[1] |= inb(dev->iobase + AIO_IIRO_16_INPUT_0_7);
    data[1] |= inb(dev->iobase + AIO_IIRO_16_INPUT_8_15) << 8;

    return insn->n;
}

static int aio_iiro_16_attach(struct comedi_device *dev,
                  struct comedi_devconfig *it)
{
    const struct aio_iiro_16_board *board = comedi_board(dev);
    int iobase;
    struct comedi_subdevice *s;
    int ret;

    printk(KERN_INFO "comedi%d: aio_iiro_16: ", dev->minor);

    dev->board_name = board->name;

    iobase = it->options[0];

    if (!request_region(iobase, AIO_IIRO_16_SIZE, dev->board_name)) {
        printk("I/O port conflict");
        return -EIO;
    }

    dev->iobase = iobase;

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

    s = &dev->subdevices[0];
    s->type = COMEDI_SUBD_DIO;
    s->subdev_flags = SDF_WRITABLE;
    s->n_chan = 16;
    s->maxdata = 1;
    s->range_table = &range_digital;
    s->insn_bits = aio_iiro_16_dio_insn_bits_write;

    s = &dev->subdevices[1];
    s->type = COMEDI_SUBD_DIO;
    s->subdev_flags = SDF_READABLE;
    s->n_chan = 16;
    s->maxdata = 1;
    s->range_table = &range_digital;
    s->insn_bits = aio_iiro_16_dio_insn_bits_read;

    printk("attached\n");

    return 1;
}

static void aio_iiro_16_detach(struct comedi_device *dev)
{
    if (dev->iobase)
        release_region(dev->iobase, AIO_IIRO_16_SIZE);
}

static struct comedi_driver aio_iiro_16_driver = {
    .driver_name    = "aio_iiro_16",
    .module     = THIS_MODULE,
    .attach     = aio_iiro_16_attach,
    .detach     = aio_iiro_16_detach,
    .board_name = &aio_iiro_16_boards[0].name,
    .offset     = sizeof(struct aio_iiro_16_board),
    .num_names  = ARRAY_SIZE(aio_iiro_16_boards),
};
module_comedi_driver(aio_iiro_16_driver);

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