1 /*
2 comedi/drivers/dt2817.c
3 Hardware driver for Data Translation DT2817
4
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1998 David A. Schleef <ds@schleef.org>
7
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.
12
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.
17
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.
21
22 */
23 /*
24 Driver: dt2817
25 Description: Data Translation DT2817
26 Author: ds
27 Status: complete
28 Devices: [Data Translation] DT2817 (dt2817)
29
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.
33
34 The driver (which, btw, is much less than 50 pages) has 1 subdevice
35 with 32 channels, configurable in groups of 8.
36
37 Configuration options:
38 [0] - I/O port base base address
39 */
40
41 #include "../comedidev.h"
42
43 #include <linux/ioport.h>
44
45 #define DT2817_SIZE 5
46
47 #define DT2817_CR 0
48 #define DT2817_DATA 1
49
dt2817_dio_insn_config(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_insn * insn,unsigned int * data)50 static int dt2817_dio_insn_config(struct comedi_device *dev,
51 struct comedi_subdevice *s,
52 struct comedi_insn *insn, unsigned int *data)
53 {
54 int mask;
55 int chan;
56 int oe = 0;
57
58 if (insn->n != 1)
59 return -EINVAL;
60
61 chan = CR_CHAN(insn->chanspec);
62 if (chan < 8)
63 mask = 0xff;
64 else if (chan < 16)
65 mask = 0xff00;
66 else if (chan < 24)
67 mask = 0xff0000;
68 else
69 mask = 0xff000000;
70 if (data[0])
71 s->io_bits |= mask;
72 else
73 s->io_bits &= ~mask;
74
75 if (s->io_bits & 0x000000ff)
76 oe |= 0x1;
77 if (s->io_bits & 0x0000ff00)
78 oe |= 0x2;
79 if (s->io_bits & 0x00ff0000)
80 oe |= 0x4;
81 if (s->io_bits & 0xff000000)
82 oe |= 0x8;
83
84 outb(oe, dev->iobase + DT2817_CR);
85
86 return 1;
87 }
88
dt2817_dio_insn_bits(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_insn * insn,unsigned int * data)89 static int dt2817_dio_insn_bits(struct comedi_device *dev,
90 struct comedi_subdevice *s,
91 struct comedi_insn *insn, unsigned int *data)
92 {
93 unsigned int changed;
94
95 /* It's questionable whether it is more important in
96 * a driver like this to be deterministic or fast.
97 * We choose fast. */
98
99 if (data[0]) {
100 changed = s->state;
101 s->state &= ~data[0];
102 s->state |= (data[0] & data[1]);
103 changed ^= s->state;
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);
116 }
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);
121
122 return insn->n;
123 }
124
dt2817_attach(struct comedi_device * dev,struct comedi_devconfig * it)125 static int dt2817_attach(struct comedi_device *dev, struct comedi_devconfig *it)
126 {
127 int ret;
128 struct comedi_subdevice *s;
129
130 ret = comedi_request_region(dev, it->options[0], DT2817_SIZE);
131 if (ret)
132 return ret;
133
134 ret = comedi_alloc_subdevices(dev, 1);
135 if (ret)
136 return ret;
137
138 s = &dev->subdevices[0];
139
140 s->n_chan = 32;
141 s->type = COMEDI_SUBD_DIO;
142 s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
143 s->range_table = &range_digital;
144 s->maxdata = 1;
145 s->insn_bits = dt2817_dio_insn_bits;
146 s->insn_config = dt2817_dio_insn_config;
147
148 s->state = 0;
149 outb(0, dev->iobase + DT2817_CR);
150
151 return 0;
152 }
153
154 static struct comedi_driver dt2817_driver = {
155 .driver_name = "dt2817",
156 .module = THIS_MODULE,
157 .attach = dt2817_attach,
158 .detach = comedi_legacy_detach,
159 };
160 module_comedi_driver(dt2817_driver);
161
162 MODULE_AUTHOR("Comedi http://www.comedi.org");
163 MODULE_DESCRIPTION("Comedi low-level driver");
164 MODULE_LICENSE("GPL");
165