rti802.c revision 0a85b6f0ab0d2edb0d41b32697111ce0e4f43496 
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
60COMEDI_INITCLEANUP(driver_rti802);
61
62struct rti802_private {
63	enum {
64		dac_2comp, dac_straight
65	} dac_coding[8];
66	const struct comedi_lrange *range_type_list[8];
67	unsigned int ao_readback[8];
68};
69
70#define devpriv ((struct rti802_private *)dev->private)
71
72static int rti802_ao_insn_read(struct comedi_device *dev,
73			       struct comedi_subdevice *s,
74			       struct comedi_insn *insn, unsigned int *data)
75{
76	int i;
77
78	for (i = 0; i < insn->n; i++)
79		data[i] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
80
81	return i;
82}
83
84static int rti802_ao_insn_write(struct comedi_device *dev,
85				struct comedi_subdevice *s,
86				struct comedi_insn *insn, unsigned int *data)
87{
88	int i, d;
89	int chan = CR_CHAN(insn->chanspec);
90
91	for (i = 0; i < insn->n; i++) {
92		d = devpriv->ao_readback[chan] = data[i];
93		if (devpriv->dac_coding[chan] == dac_2comp)
94			d ^= 0x800;
95		outb(chan, dev->iobase + RTI802_SELECT);
96		outb(d & 0xff, dev->iobase + RTI802_DATALOW);
97		outb(d >> 8, dev->iobase + RTI802_DATAHIGH);
98	}
99	return i;
100}
101
102static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
103{
104	struct comedi_subdevice *s;
105	int i;
106	unsigned long iobase;
107
108	iobase = it->options[0];
109	printk("comedi%d: rti802: 0x%04lx ", dev->minor, iobase);
110	if (!request_region(iobase, RTI802_SIZE, "rti802")) {
111		printk("I/O port conflict\n");
112		return -EIO;
113	}
114	dev->iobase = iobase;
115
116	dev->board_name = "rti802";
117
118	if (alloc_subdevices(dev, 1) < 0
119	    || alloc_private(dev, sizeof(struct rti802_private))) {
120		return -ENOMEM;
121	}
122
123	s = dev->subdevices;
124	/* ao subdevice */
125	s->type = COMEDI_SUBD_AO;
126	s->subdev_flags = SDF_WRITABLE;
127	s->maxdata = 0xfff;
128	s->n_chan = 8;
129	s->insn_read = rti802_ao_insn_read;
130	s->insn_write = rti802_ao_insn_write;
131	s->range_table_list = devpriv->range_type_list;
132
133	for (i = 0; i < 8; i++) {
134		devpriv->dac_coding[i] = (it->options[3 + 2 * i])
135		    ? (dac_straight)
136		    : (dac_2comp);
137		devpriv->range_type_list[i] = (it->options[2 + 2 * i])
138		    ? &range_unipolar10 : &range_bipolar10;
139	}
140
141	printk("\n");
142
143	return 0;
144}
145
146static int rti802_detach(struct comedi_device *dev)
147{
148	printk("comedi%d: rti802: remove\n", dev->minor);
149
150	if (dev->iobase)
151		release_region(dev->iobase, RTI802_SIZE);
152
153	return 0;
154}
155