2 comedi/drivers/dt2817.c
3 Hardware driver for Data Translation DT2817
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1998 David A. Schleef <ds@schleef.org>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 Description: Data Translation DT2817
28 Devices: [Data Translation] DT2817 (dt2817)
30 A very simple digital I/O card. Four banks of 8 lines, each bank
31 is configurable for input or output. One wonders why it takes a
32 50 page manual to describe this thing.
34 The driver (which, btw, is much less than 50 pages) has 1 subdevice
35 with 32 channels, configurable in groups of 8.
37 Configuration options:
38 [0] - I/O port base base address
41 #include "../comedidev.h"
43 #include <linux/ioport.h>
50 static int dt2817_dio_insn_config(struct comedi_device *dev,
51 struct comedi_subdevice *s,
52 struct comedi_insn *insn, unsigned int *data)
61 chan = CR_CHAN(insn->chanspec);
75 if (s->io_bits & 0x000000ff)
77 if (s->io_bits & 0x0000ff00)
79 if (s->io_bits & 0x00ff0000)
81 if (s->io_bits & 0xff000000)
84 outb(oe, dev->iobase + DT2817_CR);
89 static int dt2817_dio_insn_bits(struct comedi_device *dev,
90 struct comedi_subdevice *s,
91 struct comedi_insn *insn, unsigned int *data)
95 /* It's questionable whether it is more important in
96 * a driver like this to be deterministic or fast.
101 s->state &= ~data[0];
102 s->state |= (data[0] & data[1]);
104 changed &= s->io_bits;
105 if (changed & 0x000000ff)
106 outb(s->state & 0xff, dev->iobase + DT2817_DATA + 0);
107 if (changed & 0x0000ff00)
108 outb((s->state >> 8) & 0xff,
109 dev->iobase + DT2817_DATA + 1);
110 if (changed & 0x00ff0000)
111 outb((s->state >> 16) & 0xff,
112 dev->iobase + DT2817_DATA + 2);
113 if (changed & 0xff000000)
114 outb((s->state >> 24) & 0xff,
115 dev->iobase + DT2817_DATA + 3);
117 data[1] = inb(dev->iobase + DT2817_DATA + 0);
118 data[1] |= (inb(dev->iobase + DT2817_DATA + 1) << 8);
119 data[1] |= (inb(dev->iobase + DT2817_DATA + 2) << 16);
120 data[1] |= (inb(dev->iobase + DT2817_DATA + 3) << 24);
125 static int dt2817_attach(struct comedi_device *dev, struct comedi_devconfig *it)
128 struct comedi_subdevice *s;
130 ret = comedi_request_region(dev, it->options[0], DT2817_SIZE);
134 ret = comedi_alloc_subdevices(dev, 1);
138 s = &dev->subdevices[0];
141 s->type = COMEDI_SUBD_DIO;
142 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
143 s->range_table = &range_digital;
145 s->insn_bits = dt2817_dio_insn_bits;
146 s->insn_config = dt2817_dio_insn_config;
149 outb(0, dev->iobase + DT2817_CR);
154 static struct comedi_driver dt2817_driver = {
155 .driver_name = "dt2817",
156 .module = THIS_MODULE,
157 .attach = dt2817_attach,
158 .detach = comedi_legacy_detach,
160 module_comedi_driver(dt2817_driver);
162 MODULE_AUTHOR("Comedi http://www.comedi.org");
163 MODULE_DESCRIPTION("Comedi low-level driver");
164 MODULE_LICENSE("GPL");