rti802.c revision 7114a28011f9d5f3d981731ad341177c21f9d948 
1/*
2   comedi/drivers/rti802.c
3   Hardware driver for Analog Devices RTI-802 board
4
5   COMEDI - Linux Control and Measurement Device Interface
6   Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
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/*
24Driver: rti802
25Description: Analog Devices RTI-802
26Author: Anders Blomdell <anders.blomdell@control.lth.se>
27Devices: [Analog Devices] RTI-802 (rti802)
28Status: works
29
30Configuration Options:
31    [0] - i/o base
32    [1] - unused
33    [2] - dac#0  0=two's comp, 1=straight
34    [3] - dac#0  0=bipolar, 1=unipolar
35    [4] - dac#1 ...
36    ...
37    [17] - dac#7 ...
38*/
39
40#include "../comedidev.h"
41
42#include <linux/ioport.h>
43
44#define RTI802_SIZE 4
45
46#define RTI802_SELECT 0
47#define RTI802_DATALOW 1
48#define RTI802_DATAHIGH 2
49
50static int rti802_attach(struct comedi_device *dev,
51			 struct comedi_devconfig *it);
52static int rti802_detach(struct comedi_device *dev);
53static struct comedi_driver driver_rti802 = {
54	.driver_name = "rti802",
55	.module = THIS_MODULE,
56	.attach = rti802_attach,
57	.detach = rti802_detach,
58};
59
60static int __init driver_rti802_init_module(void)
61{
62	return comedi_driver_register(&driver_rti802);
63}
64
65static void __exit driver_rti802_cleanup_module(void)
66{
67	comedi_driver_unregister(&driver_rti802);
68}
69
70module_init(driver_rti802_init_module);
71module_exit(driver_rti802_cleanup_module);
72
73struct rti802_private {
74	enum {
75		dac_2comp, dac_straight
76	} dac_coding[8];
77	const struct comedi_lrange *range_type_list[8];
78	unsigned int ao_readback[8];
79};
80
81#define devpriv ((struct rti802_private *)dev->private)
82
83static int rti802_ao_insn_read(struct comedi_device *dev,
84			       struct comedi_subdevice *s,
85			       struct comedi_insn *insn, unsigned int *data)
86{
87	int i;
88
89	for (i = 0; i < insn->n; i++)
90		data[i] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
91
92	return i;
93}
94
95static int rti802_ao_insn_write(struct comedi_device *dev,
96				struct comedi_subdevice *s,
97				struct comedi_insn *insn, unsigned int *data)
98{
99	int i, d;
100	int chan = CR_CHAN(insn->chanspec);
101
102	for (i = 0; i < insn->n; i++) {
103		d = devpriv->ao_readback[chan] = data[i];
104		if (devpriv->dac_coding[chan] == dac_2comp)
105			d ^= 0x800;
106		outb(chan, dev->iobase + RTI802_SELECT);
107		outb(d & 0xff, dev->iobase + RTI802_DATALOW);
108		outb(d >> 8, dev->iobase + RTI802_DATAHIGH);
109	}
110	return i;
111}
112
113static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
114{
115	struct comedi_subdevice *s;
116	int i;
117	unsigned long iobase;
118
119	iobase = it->options[0];
120	printk(KERN_INFO "comedi%d: rti802: 0x%04lx ", dev->minor, iobase);
121	if (!request_region(iobase, RTI802_SIZE, "rti802")) {
122		printk(KERN_WARNING "I/O port conflict\n");
123		return -EIO;
124	}
125	dev->iobase = iobase;
126
127	dev->board_name = "rti802";
128
129	if (alloc_subdevices(dev, 1) < 0
130	    || alloc_private(dev, sizeof(struct rti802_private))) {
131		return -ENOMEM;
132	}
133
134	s = dev->subdevices;
135	/* ao subdevice */
136	s->type = COMEDI_SUBD_AO;
137	s->subdev_flags = SDF_WRITABLE;
138	s->maxdata = 0xfff;
139	s->n_chan = 8;
140	s->insn_read = rti802_ao_insn_read;
141	s->insn_write = rti802_ao_insn_write;
142	s->range_table_list = devpriv->range_type_list;
143
144	for (i = 0; i < 8; i++) {
145		devpriv->dac_coding[i] = (it->options[3 + 2 * i])
146		    ? (dac_straight)
147		    : (dac_2comp);
148		devpriv->range_type_list[i] = (it->options[2 + 2 * i])
149		    ? &range_unipolar10 : &range_bipolar10;
150	}
151
152	return 0;
153}
154
155static int rti802_detach(struct comedi_device *dev)
156{
157	printk(KERN_INFO "comedi%d: rti802: remove\n", dev->minor);
158
159	if (dev->iobase)
160		release_region(dev->iobase, RTI802_SIZE);
161
162	return 0;
163}
164
165MODULE_AUTHOR("Comedi http://www.comedi.org");
166MODULE_DESCRIPTION("Comedi low-level driver");
167MODULE_LICENSE("GPL");
168