ke_counter.c

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/*
    comedi/drivers/ke_counter.c
    Comedi driver for Kolter-Electronic PCI Counter 1 Card

    COMEDI - Linux Control and Measurement Device Interface
    Copyright (C) 2000 David A. Schleef <[email protected]>

    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: ke_counter
Description: Driver for Kolter Electronic Counter Card
Devices: [Kolter Electronic] PCI Counter Card (ke_counter)
Author: Michael Hillmann
Updated: Mon, 14 Apr 2008 15:42:42 +0100
Status: tested

Configuration Options: not applicable, uses PCI auto config

This driver is a simple driver to read the counter values from
Kolter Electronic PCI Counter Card.
*/

#include "../comedidev.h"

#define CNT_DRIVER_NAME         "ke_counter"
#define PCI_VENDOR_ID_KOLTER    0x1001
#define CNT_CARD_DEVICE_ID      0x0014

/*-- board specification structure ------------------------------------------*/

struct cnt_board_struct {

    const char *name;
    int device_id;
    int cnt_channel_nbr;
    int cnt_bits;
};

static const struct cnt_board_struct cnt_boards[] = {
    {
     .name = CNT_DRIVER_NAME,
     .device_id = CNT_CARD_DEVICE_ID,
     .cnt_channel_nbr = 3,
     .cnt_bits = 24}
};

/*-- counter write ----------------------------------------------------------*/

/* This should be used only for resetting the counters; maybe it is better
   to make a special command 'reset'. */
static int cnt_winsn(struct comedi_device *dev,
             struct comedi_subdevice *s, struct comedi_insn *insn,
             unsigned int *data)
{
    int chan = CR_CHAN(insn->chanspec);

    outb((unsigned char)((data[0] >> 24) & 0xff),
         dev->iobase + chan * 0x20 + 0x10);
    outb((unsigned char)((data[0] >> 16) & 0xff),
         dev->iobase + chan * 0x20 + 0x0c);
    outb((unsigned char)((data[0] >> 8) & 0xff),
         dev->iobase + chan * 0x20 + 0x08);
    outb((unsigned char)((data[0] >> 0) & 0xff),
         dev->iobase + chan * 0x20 + 0x04);

    /* return the number of samples written */
    return 1;
}

/*-- counter read -----------------------------------------------------------*/

static int cnt_rinsn(struct comedi_device *dev,
             struct comedi_subdevice *s, struct comedi_insn *insn,
             unsigned int *data)
{
    unsigned char a0, a1, a2, a3, a4;
    int chan = CR_CHAN(insn->chanspec);
    int result;

    a0 = inb(dev->iobase + chan * 0x20);
    a1 = inb(dev->iobase + chan * 0x20 + 0x04);
    a2 = inb(dev->iobase + chan * 0x20 + 0x08);
    a3 = inb(dev->iobase + chan * 0x20 + 0x0c);
    a4 = inb(dev->iobase + chan * 0x20 + 0x10);

    result = (a1 + (a2 * 256) + (a3 * 65536));
    if (a4 > 0)
        result = result - s->maxdata;

    *data = (unsigned int)result;

    /* return the number of samples read */
    return 1;
}

static const void *cnt_find_boardinfo(struct comedi_device *dev,
                      struct pci_dev *pcidev)
{
    const struct cnt_board_struct *board;
    int i;

    for (i = 0; i < ARRAY_SIZE(cnt_boards); i++) {
        board = &cnt_boards[i];
        if (board->device_id == pcidev->device)
            return board;
    }
    return NULL;
}

static int cnt_attach_pci(struct comedi_device *dev,
              struct pci_dev *pcidev)
{
    const struct cnt_board_struct *board;
    struct comedi_subdevice *s;
    int ret;

    comedi_set_hw_dev(dev, &pcidev->dev);

    board = cnt_find_boardinfo(dev, pcidev);
    if (!board)
        return -ENODEV;
    dev->board_ptr = board;
    dev->board_name = board->name;

    ret = comedi_pci_enable(pcidev, dev->board_name);
    if (ret)
        return ret;
    dev->iobase = pci_resource_start(pcidev, 0);

    ret = comedi_alloc_subdevices(dev, 1);
    if (ret)
        return ret;

    s = &dev->subdevices[0];
    dev->read_subdev = s;

    s->type = COMEDI_SUBD_COUNTER;
    s->subdev_flags = SDF_READABLE /* | SDF_COMMON */ ;
    s->n_chan = board->cnt_channel_nbr;
    s->maxdata = (1 << board->cnt_bits) - 1;
    s->insn_read = cnt_rinsn;
    s->insn_write = cnt_winsn;

    /*  select 20MHz clock */
    outb(3, dev->iobase + 248);

    /*  reset all counters */
    outb(0, dev->iobase);
    outb(0, dev->iobase + 0x20);
    outb(0, dev->iobase + 0x40);

    dev_info(dev->class_dev, "%s: %s attached\n",
        dev->driver->driver_name, dev->board_name);

    return 0;
}

static void cnt_detach(struct comedi_device *dev)
{
    struct pci_dev *pcidev = comedi_to_pci_dev(dev);

    if (pcidev) {
        if (dev->iobase)
            comedi_pci_disable(pcidev);
    }
}

static struct comedi_driver ke_counter_driver = {
    .driver_name    = "ke_counter",
    .module     = THIS_MODULE,
    .attach_pci = cnt_attach_pci,
    .detach     = cnt_detach,
};

static int __devinit ke_counter_pci_probe(struct pci_dev *dev,
                      const struct pci_device_id *ent)
{
    return comedi_pci_auto_config(dev, &ke_counter_driver);
}

static void __devexit ke_counter_pci_remove(struct pci_dev *dev)
{
    comedi_pci_auto_unconfig(dev);
}

static DEFINE_PCI_DEVICE_TABLE(ke_counter_pci_table) = {
    { PCI_DEVICE(PCI_VENDOR_ID_KOLTER, CNT_CARD_DEVICE_ID) },
    { 0 }
};
MODULE_DEVICE_TABLE(pci, ke_counter_pci_table);

static struct pci_driver ke_counter_pci_driver = {
    .name       = "ke_counter",
    .id_table   = ke_counter_pci_table,
    .probe      = ke_counter_pci_probe,
    .remove     = __devexit_p(ke_counter_pci_remove),
};
module_comedi_pci_driver(ke_counter_driver, ke_counter_pci_driver);

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