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

   1/*
   2 * Driver for Amplicon PC263 relay board.
   3 *
   4 * Copyright (C) 2002 MEV Ltd. <http://www.mev.co.uk/>
   5 *
   6 * COMEDI - Linux Control and Measurement Device Interface
   7 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 */
  19
  20/*
  21 * Driver: amplc_pc263
  22 * Description: Amplicon PC263
  23 * Author: Ian Abbott <abbotti@mev.co.uk>
  24 * Devices: [Amplicon] PC263 (pc263)
  25 * Updated: Fri, 12 Apr 2013 15:19:36 +0100
  26 * Status: works
  27 *
  28 * Configuration options:
  29 *   [0] - I/O port base address
  30 *
  31 * The board appears as one subdevice, with 16 digital outputs, each
  32 * connected to a reed-relay. Relay contacts are closed when output is 1.
  33 * The state of the outputs can be read.
  34 */
  35
  36#include <linux/module.h>
  37#include "../comedidev.h"
  38
  39/* PC263 registers */
  40#define PC263_DO_0_7_REG        0x00
  41#define PC263_DO_8_15_REG       0x01
  42
  43struct pc263_board {
  44        const char *name;
  45};
  46
  47static const struct pc263_board pc263_boards[] = {
  48        {
  49                .name = "pc263",
  50        },
  51};
  52
  53static int pc263_do_insn_bits(struct comedi_device *dev,
  54                              struct comedi_subdevice *s,
  55                              struct comedi_insn *insn,
  56                              unsigned int *data)
  57{
  58        if (comedi_dio_update_state(s, data)) {
  59                outb(s->state & 0xff, dev->iobase + PC263_DO_0_7_REG);
  60                outb((s->state >> 8) & 0xff, dev->iobase + PC263_DO_8_15_REG);
  61        }
  62
  63        data[1] = s->state;
  64
  65        return insn->n;
  66}
  67
  68static int pc263_attach(struct comedi_device *dev, struct comedi_devconfig *it)
  69{
  70        struct comedi_subdevice *s;
  71        int ret;
  72
  73        ret = comedi_request_region(dev, it->options[0], 0x2);
  74        if (ret)
  75                return ret;
  76
  77        ret = comedi_alloc_subdevices(dev, 1);
  78        if (ret)
  79                return ret;
  80
  81        /* Digital Output subdevice */
  82        s = &dev->subdevices[0];
  83        s->type         = COMEDI_SUBD_DO;
  84        s->subdev_flags = SDF_WRITABLE;
  85        s->n_chan       = 16;
  86        s->maxdata      = 1;
  87        s->range_table  = &range_digital;
  88        s->insn_bits    = pc263_do_insn_bits;
  89
  90        /* read initial relay state */
  91        s->state = inb(dev->iobase + PC263_DO_0_7_REG) |
  92                   (inb(dev->iobase + PC263_DO_8_15_REG) << 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