LXR linux/drivers/staging/comedi/drivers/amplc

   1/*
   2    comedi/drivers/amplc_pc263.c
   3    Driver for Amplicon PC263 and PCI263 relay boards.
   4
   5    Copyright (C) 2002 MEV Ltd. <http://www.mev.co.uk/>
   6
   7    COMEDI - Linux Control and Measurement Device Interface
   8    Copyright (C) 2000 David A. Schleef <ds@schleef.org>
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19*/
  20/*
  21Driver: amplc_pc263
  22Description: Amplicon PC263
  23Author: Ian Abbott <abbotti@mev.co.uk>
  24Devices: [Amplicon] PC263 (pc263)
  25Updated: Fri, 12 Apr 2013 15:19:36 +0100
  26Status: works
  27
  28Configuration options:
  29  [0] - I/O port base address
  30
  31The board appears as one subdevice, with 16 digital outputs, each
  32connected to a reed-relay. Relay contacts are closed when output is 1.
  33The state of the outputs can be read.
  34*/
  35
  36#include <linux/module.h>
  37#include "../comedidev.h"
  38
  39/* PC263 registers */
  40
  41/*
  42 * Board descriptions for Amplicon PC263.
  43 */
  44
  45struct pc263_board {
  46        const char *name;
  47};
  48
  49static const struct pc263_board pc263_boards[] = {
  50        {
  51                .name = "pc263",
  52        },
  53};
  54
  55static int pc263_do_insn_bits(struct comedi_device *dev,
  56                              struct comedi_subdevice *s,
  57                              struct comedi_insn *insn,
  58                              unsigned int *data)
  59{
  60        if (comedi_dio_update_state(s, data)) {
  61                outb(s->state & 0xff, dev->iobase);
  62                outb((s->state >> 8) & 0xff, dev->iobase + 1);
  63        }
  64
  65        data[1] = s->state;
  66
  67        return insn->n;
  68}
  69
  70static int pc263_attach(struct comedi_device *dev, struct comedi_devconfig *it)
  71{
  72        struct comedi_subdevice *s;
  73        int ret;
  74
  75        ret = comedi_request_region(dev, it->options[0], 0x2);
  76        if (ret)
  77                return ret;
  78
  79        ret = comedi_alloc_subdevices(dev, 1);
  80        if (ret)
  81                return ret;
  82
  83        s = &dev->subdevices[0];
  84        /* digital output subdevice */
  85        s->type = COMEDI_SUBD_DO;
  86        s->subdev_flags = SDF_WRITABLE;
  87        s->n_chan = 16;
  88        s->maxdata = 1;
  89        s->range_table = &range_digital;
  90        s->insn_bits = pc263_do_insn_bits;
  91        /* read initial relay state */
  92        s->state = inb(dev->iobase) | (inb(dev->iobase + 1) << 8);
  93
  94        return 0;
  95}
  96
  97static struct comedi_driver amplc_pc263_driver = {
  98        .driver_name = "amplc_pc263",
  99        .module = THIS_MODULE,
 100        .attach = pc263_attach,
 101        .detach = comedi_legacy_detach,
 102        .board_name = &pc263_boards[0].name,
 103        .offset = sizeof(struct pc263_board),
 104        .num_names = ARRAY_SIZE(pc263_boards),
 105};
 106
 107module_comedi_driver(amplc_pc263_driver);
 108
 109MODULE_AUTHOR("Comedi http://www.comedi.org");
 110MODULE_DESCRIPTION("Comedi driver for Amplicon PC263 relay board");
 111MODULE_LICENSE("GPL");
 112