2 comedi/drivers/rti802.c
3 Hardware driver for Analog Devices RTI-802 board
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
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.
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.
25 Description: Analog Devices RTI-802
26 Author: Anders Blomdell <anders.blomdell@control.lth.se>
27 Devices: [Analog Devices] RTI-802 (rti802)
30 Configuration Options:
33 [2] - dac#0 0=two's comp, 1=straight
34 [3] - dac#0 0=bipolar, 1=unipolar
40 #include "../comedidev.h"
42 #include <linux/ioport.h>
46 #define RTI802_SELECT 0
47 #define RTI802_DATALOW 1
48 #define RTI802_DATAHIGH 2
50 static int rti802_attach(struct comedi_device *dev,
51 struct comedi_devconfig *it);
52 static int rti802_detach(struct comedi_device *dev);
53 static struct comedi_driver driver_rti802 = {
54 .driver_name = "rti802",
55 .module = THIS_MODULE,
56 .attach = rti802_attach,
57 .detach = rti802_detach,
60 static int __init driver_rti802_init_module(void)
62 return comedi_driver_register(&driver_rti802);
65 static void __exit driver_rti802_cleanup_module(void)
67 comedi_driver_unregister(&driver_rti802);
70 module_init(driver_rti802_init_module);
71 module_exit(driver_rti802_cleanup_module);
73 struct rti802_private {
75 dac_2comp, dac_straight
77 const struct comedi_lrange *range_type_list[8];
78 unsigned int ao_readback[8];
81 #define devpriv ((struct rti802_private *)dev->private)
83 static int rti802_ao_insn_read(struct comedi_device *dev,
84 struct comedi_subdevice *s,
85 struct comedi_insn *insn, unsigned int *data)
89 for (i = 0; i < insn->n; i++)
90 data[i] = devpriv->ao_readback[CR_CHAN(insn->chanspec)];
95 static int rti802_ao_insn_write(struct comedi_device *dev,
96 struct comedi_subdevice *s,
97 struct comedi_insn *insn, unsigned int *data)
100 int chan = CR_CHAN(insn->chanspec);
102 for (i = 0; i < insn->n; i++) {
103 d = devpriv->ao_readback[chan] = data[i];
104 if (devpriv->dac_coding[chan] == dac_2comp)
106 outb(chan, dev->iobase + RTI802_SELECT);
107 outb(d & 0xff, dev->iobase + RTI802_DATALOW);
108 outb(d >> 8, dev->iobase + RTI802_DATAHIGH);
113 static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
115 struct comedi_subdevice *s;
117 unsigned long iobase;
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");
125 dev->iobase = iobase;
127 dev->board_name = "rti802";
129 if (alloc_subdevices(dev, 1) < 0
130 || alloc_private(dev, sizeof(struct rti802_private))) {
136 s->type = COMEDI_SUBD_AO;
137 s->subdev_flags = SDF_WRITABLE;
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;
144 for (i = 0; i < 8; i++) {
145 devpriv->dac_coding[i] = (it->options[3 + 2 * i])
148 devpriv->range_type_list[i] = (it->options[2 + 2 * i])
149 ? &range_unipolar10 : &range_bipolar10;
155 static int rti802_detach(struct comedi_device *dev)
157 printk(KERN_INFO "comedi%d: rti802: remove\n", dev->minor);
160 release_region(dev->iobase, RTI802_SIZE);
165 MODULE_AUTHOR("Comedi http://www.comedi.org");
166 MODULE_DESCRIPTION("Comedi low-level driver");
167 MODULE_LICENSE("GPL");