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.
20 Description: Data Translation DT2817
23 Devices: [Data Translation] DT2817 (dt2817)
25 A very simple digital I/O card. Four banks of 8 lines, each bank
26 is configurable for input or output. One wonders why it takes a
27 50 page manual to describe this thing.
29 The driver (which, btw, is much less than 50 pages) has 1 subdevice
30 with 32 channels, configurable in groups of 8.
32 Configuration options:
33 [0] - I/O port base base address
36 #include "../comedidev.h"
38 #include <linux/ioport.h>
45 static int dt2817_dio_insn_config(struct comedi_device *dev,
46 struct comedi_subdevice *s,
47 struct comedi_insn *insn, unsigned int *data)
56 chan = CR_CHAN(insn->chanspec);
70 if (s->io_bits & 0x000000ff)
72 if (s->io_bits & 0x0000ff00)
74 if (s->io_bits & 0x00ff0000)
76 if (s->io_bits & 0xff000000)
79 outb(oe, dev->iobase + DT2817_CR);
84 static int dt2817_dio_insn_bits(struct comedi_device *dev,
85 struct comedi_subdevice *s,
86 struct comedi_insn *insn, unsigned int *data)
90 /* It's questionable whether it is more important in
91 * a driver like this to be deterministic or fast.
97 s->state |= (data[0] & data[1]);
99 changed &= s->io_bits;
100 if (changed & 0x000000ff)
101 outb(s->state & 0xff, dev->iobase + DT2817_DATA + 0);
102 if (changed & 0x0000ff00)
103 outb((s->state >> 8) & 0xff,
104 dev->iobase + DT2817_DATA + 1);
105 if (changed & 0x00ff0000)
106 outb((s->state >> 16) & 0xff,
107 dev->iobase + DT2817_DATA + 2);
108 if (changed & 0xff000000)
109 outb((s->state >> 24) & 0xff,
110 dev->iobase + DT2817_DATA + 3);
112 data[1] = inb(dev->iobase + DT2817_DATA + 0);
113 data[1] |= (inb(dev->iobase + DT2817_DATA + 1) << 8);
114 data[1] |= (inb(dev->iobase + DT2817_DATA + 2) << 16);
115 data[1] |= (inb(dev->iobase + DT2817_DATA + 3) << 24);
120 static int dt2817_attach(struct comedi_device *dev, struct comedi_devconfig *it)
123 struct comedi_subdevice *s;
125 ret = comedi_request_region(dev, it->options[0], DT2817_SIZE);
129 ret = comedi_alloc_subdevices(dev, 1);
133 s = &dev->subdevices[0];
136 s->type = COMEDI_SUBD_DIO;
137 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
138 s->range_table = &range_digital;
140 s->insn_bits = dt2817_dio_insn_bits;
141 s->insn_config = dt2817_dio_insn_config;
144 outb(0, dev->iobase + DT2817_CR);
149 static struct comedi_driver dt2817_driver = {
150 .driver_name = "dt2817",
151 .module = THIS_MODULE,
152 .attach = dt2817_attach,
153 .detach = comedi_legacy_detach,
155 module_comedi_driver(dt2817_driver);
157 MODULE_AUTHOR("Comedi http://www.comedi.org");
158 MODULE_DESCRIPTION("Comedi low-level driver");
159 MODULE_LICENSE("GPL");