amplc_pc236.c revision f57f5848f9b313889702b018220ea256284dbddf 
1/*
2 * comedi/drivers/amplc_pc236.c
3 * Driver for Amplicon PC36AT DIO 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_pc236
22 * Description: Amplicon PC36AT
23 * Author: Ian Abbott <abbotti@mev.co.uk>
24 * Devices: [Amplicon] PC36AT (pc36at)
25 * Updated: Fri, 25 Jul 2014 15:32:40 +0000
26 * Status: works
27 *
28 * Configuration options - PC36AT:
29 *   [0] - I/O port base address
30 *   [1] - IRQ (optional)
31 *
32 * The PC36AT board has a single 8255 appearing as subdevice 0.
33 *
34 * Subdevice 1 pretends to be a digital input device, but it always returns
35 * 0 when read. However, if you run a command with scan_begin_src=TRIG_EXT,
36 * a rising edge on port C bit 3 acts as an external trigger, which can be
37 * used to wake up tasks.  This is like the comedi_parport device, but the
38 * only way to physically disable the interrupt on the PC36AT is to remove
39 * the IRQ jumper.  If no interrupt is connected, then subdevice 1 is
40 * unused.
41 */
42
43#include <linux/module.h>
44
45#include "../comedidev.h"
46
47#include "amplc_pc236.h"
48
49static int pc236_attach(struct comedi_device *dev, struct comedi_devconfig *it)
50{
51	struct pc236_private *devpriv;
52	int ret;
53
54	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
55	if (!devpriv)
56		return -ENOMEM;
57
58	ret = comedi_request_region(dev, it->options[0], 0x4);
59	if (ret)
60		return ret;
61
62	return amplc_pc236_common_attach(dev, dev->iobase, it->options[1], 0);
63}
64
65static const struct pc236_board pc236_boards[] = {
66	{
67		.name = "pc36at",
68	},
69};
70
71static struct comedi_driver amplc_pc236_driver = {
72	.driver_name = "amplc_pc236",
73	.module = THIS_MODULE,
74	.attach = pc236_attach,
75	.detach = comedi_legacy_detach,
76	.board_name = &pc236_boards[0].name,
77	.offset = sizeof(struct pc236_board),
78	.num_names = ARRAY_SIZE(pc236_boards),
79};
80
81module_comedi_driver(amplc_pc236_driver);
82
83MODULE_AUTHOR("Comedi http://www.comedi.org");
84MODULE_DESCRIPTION("Comedi driver for Amplicon PC36AT DIO boards");
85MODULE_LICENSE("GPL");
86