drivers/staging/comedi/drivers/amplc_pc263.c

   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 /*
  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 #define PC263_DRIVER_NAME       "amplc_pc263"
  40
  41 /* PC263 registers */
  42 #define PC263_IO_SIZE   2
  43
  44 /*
  45  * Board descriptions for Amplicon PC263.
  46  */
  47
  48 struct pc263_board {
  49         const char *name;
  50 };
  51
  52 static const struct pc263_board pc263_boards[] = {
  53         {
  54                 .name = "pc263",
  55         },
  56 };
  57
  58 static int pc263_do_insn_bits(struct comedi_device *dev,
  59                               struct comedi_subdevice *s,
  60                               struct comedi_insn *insn,
  61                               unsigned int *data)
  62 {
  63         if (comedi_dio_update_state(s, data)) {
  64                 outb(s->state & 0xff, dev->iobase);
  65                 outb((s->state >> 8) & 0xff, dev->iobase + 1);
  66         }
  67
  68         data[1] = s->state;
  69
  70         return insn->n;
  71 }
  72
  73 static int pc263_attach(struct comedi_device *dev, struct comedi_devconfig *it)
  74 {
  75         struct comedi_subdevice *s;
  76         int ret;
  77
  78         ret = comedi_request_region(dev, it->options[0], PC263_IO_SIZE);
  79         if (ret)
  80                 return ret;
  81
  82         ret = comedi_alloc_subdevices(dev, 1);
  83         if (ret)
  84                 return ret;
  85
  86         s = &dev->subdevices[0];
  87         /* digital output subdevice */
  88         s->type = COMEDI_SUBD_DO;
  89         s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
  90         s->n_chan = 16;
  91         s->maxdata = 1;
  92         s->range_table = &range_digital;
  93         s->insn_bits = pc263_do_insn_bits;
  94         /* read initial relay state */
  95         s->state = inb(dev->iobase) | (inb(dev->iobase + 1) << 8);
  96
  97         dev_info(dev->class_dev, "%s (base %#lx) attached\n", dev->board_name,
  98                  dev->iobase);
  99         return 0;
 100 }
 101
 102 static struct comedi_driver amplc_pc263_driver = {
 103         .driver_name = PC263_DRIVER_NAME,
 104         .module = THIS_MODULE,
 105         .attach = pc263_attach,
 106         .detach = comedi_legacy_detach,
 107         .board_name = &pc263_boards[0].name,
 108         .offset = sizeof(struct pc263_board),
 109         .num_names = ARRAY_SIZE(pc263_boards),
 110 };
 111
 112 module_comedi_driver(amplc_pc263_driver);
 113
 114 MODULE_AUTHOR("Comedi http://www.comedi.org");
 115 MODULE_DESCRIPTION("Comedi driver for Amplicon PC263 relay board");
 116 MODULE_LICENSE("GPL");