rti802.c revision 790c55415aa31f4c732729f94d2c3a54f7d3bfc2 
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(comedi_device * dev, comedi_devconfig * it);
51static int rti802_detach(comedi_device * dev);
52static comedi_driver driver_rti802 = {
53      driver_name:"rti802",
54      module:THIS_MODULE,
55      attach:rti802_attach,
56      detach:rti802_detach,
57};
58
59COMEDI_INITCLEANUP(driver_rti802);
60
61typedef struct {
62	enum {
63		dac_2comp, dac_straight
64	} dac_coding[8];
65	const comedi_lrange *range_type_list[8];
66	unsigned int ao_readback[8];
67} rti802_private;
68
69#define devpriv ((rti802_private *)dev->private)
70
71static int rti802_ao_insn_read(comedi_device * dev, comedi_subdevice * s,
72	comedi_insn * insn, unsigned int * data)
73{
74	int i;
75
76	for (i = 0; i < insn->n; i++)
77		data[i] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
78
79	return i;
80}
81
82static int rti802_ao_insn_write(comedi_device * dev, comedi_subdevice * s,
83	comedi_insn * insn, unsigned int * data)
84{
85	int i, d;
86	int chan = CR_CHAN(insn->chanspec);
87
88	for (i = 0; i < insn->n; i++) {
89		d = devpriv->ao_readback[chan] = data[i];
90		if (devpriv->dac_coding[chan] == dac_2comp)
91			d ^= 0x800;
92		outb(chan, dev->iobase + RTI802_SELECT);
93		outb(d & 0xff, dev->iobase + RTI802_DATALOW);
94		outb(d >> 8, dev->iobase + RTI802_DATAHIGH);
95	}
96	return i;
97}
98
99static int rti802_attach(comedi_device * dev, comedi_devconfig * it)
100{
101	comedi_subdevice *s;
102	int i;
103	unsigned long iobase;
104
105	iobase = it->options[0];
106	printk("comedi%d: rti802: 0x%04lx ", dev->minor, iobase);
107	if (!request_region(iobase, RTI802_SIZE, "rti802")) {
108		printk("I/O port conflict\n");
109		return -EIO;
110	}
111	dev->iobase = iobase;
112
113	dev->board_name = "rti802";
114
115	if (alloc_subdevices(dev, 1) < 0
116		|| alloc_private(dev, sizeof(rti802_private))) {
117		return -ENOMEM;
118	}
119
120	s = dev->subdevices;
121	/* ao subdevice */
122	s->type = COMEDI_SUBD_AO;
123	s->subdev_flags = SDF_WRITABLE;
124	s->maxdata = 0xfff;
125	s->n_chan = 8;
126	s->insn_read = rti802_ao_insn_read;
127	s->insn_write = rti802_ao_insn_write;
128	s->range_table_list = devpriv->range_type_list;
129
130	for (i = 0; i < 8; i++) {
131		devpriv->dac_coding[i] = (it->options[3 + 2 * i])
132			? (dac_straight)
133			: (dac_2comp);
134		devpriv->range_type_list[i] = (it->options[2 + 2 * i])
135			? &range_unipolar10 : &range_bipolar10;
136	}
137
138	printk("\n");
139
140	return 0;
141}
142
143static int rti802_detach(comedi_device * dev)
144{
145	printk("comedi%d: rti802: remove\n", dev->minor);
146
147	if (dev->iobase)
148		release_region(dev->iobase, RTI802_SIZE);
149
150	return 0;
151}
152