2 comedi/drivers/adq12b.c
3 driver for MicroAxial ADQ12-B data acquisition and control card
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 2000 David A. Schleef <ds@schleef.org>
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: driver for MicroAxial ADQ12-B data acquisition and control card
26 Devices: [MicroAxial] ADQ12-B (adq12b)
27 Author: jeremy theler <thelerg@ib.cnea.gov.ar>
28 Updated: Thu, 21 Feb 2008 02:56:27 -0300
31 Driver for the acquisition card ADQ12-B (without any add-on).
33 - Analog input is subdevice 0 (16 channels single-ended or 8 differential)
34 - Digital input is subdevice 1 (5 channels)
35 - Digital output is subdevice 1 (8 channels)
36 - The PACER is not supported in this version
38 If you do not specify any options, they will default to
40 # comedi_config /dev/comedi0 adq12b 0x300,0,0
42 option 1: I/O base address. The following table is provided as a help
43 of the hardware jumpers.
46 0x300 1 (factory default)
53 option 2: unipolar/bipolar ADC selection: 0 -> bipolar, 1 -> unipolar
55 selection comedi_config option JUB
56 bipolar 0 2-3 (factory default)
59 option 3: single-ended/differential AI selection: 0 -> SE, 1 -> differential
61 selection comedi_config option JCHA JCHB
62 single-ended 0 1-2 1-2 (factory default)
63 differential 1 2-3 2-3
65 written by jeremy theler <thelerg@ib.cnea.gov.ar>
68 commission nacional de energia atomica
69 universidad nacional de cuyo
73 + changed supported devices string (missused the [] and ())
81 #include "../comedidev.h"
83 /* address scheme (page 2.17 of the manual) */
84 #define ADQ12B_SIZE 16
86 #define ADQ12B_CTREG 0x00
87 #define ADQ12B_STINR 0x00
88 #define ADQ12B_OUTBR 0x04
89 #define ADQ12B_ADLOW 0x08
90 #define ADQ12B_ADHIG 0x09
91 #define ADQ12B_CONT0 0x0c
92 #define ADQ12B_CONT1 0x0d
93 #define ADQ12B_CONT2 0x0e
94 #define ADQ12B_COWORD 0x0f
96 /* mask of the bit at STINR to check end of conversion */
97 #define ADQ12B_EOC 0x20
101 /* available ranges through the PGA gains */
102 static const struct comedi_lrange range_adq12b_ai_bipolar = { 4, {
110 static const struct comedi_lrange range_adq12b_ai_unipolar = { 4, {
119 struct adq12b_private {
120 int unipolar; /* option 2 of comedi_config (1 is iobase) */
121 int differential; /* option 3 of comedi_config */
124 unsigned int digital_state;
128 * "instructions" read/write data in "one-shot" or "software-triggered"
132 static int adq12b_ai_rinsn(struct comedi_device *dev,
133 struct comedi_subdevice *s, struct comedi_insn *insn,
136 struct adq12b_private *devpriv = dev->private;
139 unsigned char hi, lo, status;
141 /* change channel and range only if it is different from the previous */
142 range = CR_RANGE(insn->chanspec);
143 channel = CR_CHAN(insn->chanspec);
144 if (channel != devpriv->last_channel || range != devpriv->last_range) {
145 outb((range << 4) | channel, dev->iobase + ADQ12B_CTREG);
146 udelay(50); /* wait for the mux to settle */
149 /* trigger conversion */
150 status = inb(dev->iobase + ADQ12B_ADLOW);
152 /* convert n samples */
153 for (n = 0; n < insn->n; n++) {
155 /* wait for end of conversion */
159 status = inb(dev->iobase + ADQ12B_STINR);
160 status = status & ADQ12B_EOC;
161 } while (status == 0 && ++i < TIMEOUT);
162 /* } while (++i < 10); */
165 hi = inb(dev->iobase + ADQ12B_ADHIG);
166 lo = inb(dev->iobase + ADQ12B_ADLOW);
168 /* printk("debug: chan=%d range=%d status=%d hi=%d lo=%d\n",
169 channel, range, status, hi, lo); */
170 data[n] = (hi << 8) | lo;
174 /* return the number of samples read/written */
178 static int adq12b_di_insn_bits(struct comedi_device *dev,
179 struct comedi_subdevice *s,
180 struct comedi_insn *insn, unsigned int *data)
183 /* only bits 0-4 have information about digital inputs */
184 data[1] = (inb(dev->iobase + ADQ12B_STINR) & (0x1f));
189 static int adq12b_do_insn_bits(struct comedi_device *dev,
190 struct comedi_subdevice *s,
191 struct comedi_insn *insn, unsigned int *data)
193 struct adq12b_private *devpriv = dev->private;
196 for (channel = 0; channel < 8; channel++)
197 if (((data[0] >> channel) & 0x01) != 0)
198 outb((((data[1] >> channel) & 0x01) << 3) | channel,
199 dev->iobase + ADQ12B_OUTBR);
201 /* store information to retrieve when asked for reading */
203 devpriv->digital_state &= ~data[0];
204 devpriv->digital_state |= (data[0] & data[1]);
207 data[1] = devpriv->digital_state;
212 static int adq12b_attach(struct comedi_device *dev, struct comedi_devconfig *it)
214 struct adq12b_private *devpriv;
215 struct comedi_subdevice *s;
216 int unipolar, differential;
219 unipolar = it->options[1];
220 differential = it->options[2];
222 ret = comedi_request_region(dev, it->options[0], ADQ12B_SIZE);
226 devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
229 dev->private = devpriv;
231 devpriv->unipolar = unipolar;
232 devpriv->differential = differential;
233 devpriv->digital_state = 0;
235 * initialize channel and range to -1 so we make sure we
236 * always write at least once to the CTREG in the instruction
238 devpriv->last_channel = -1;
239 devpriv->last_range = -1;
241 ret = comedi_alloc_subdevices(dev, 3);
245 s = &dev->subdevices[0];
246 /* analog input subdevice */
247 s->type = COMEDI_SUBD_AI;
249 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
252 s->subdev_flags = SDF_READABLE | SDF_GROUND;
257 s->range_table = &range_adq12b_ai_unipolar;
259 s->range_table = &range_adq12b_ai_bipolar;
263 s->len_chanlist = 4; /* This is the maximum chanlist length that
264 the board can handle */
265 s->insn_read = adq12b_ai_rinsn;
267 s = &dev->subdevices[1];
268 /* digital input subdevice */
269 s->type = COMEDI_SUBD_DI;
270 s->subdev_flags = SDF_READABLE;
273 s->range_table = &range_digital;
274 s->insn_bits = adq12b_di_insn_bits;
276 s = &dev->subdevices[2];
277 /* digital output subdevice */
278 s->type = COMEDI_SUBD_DO;
279 s->subdev_flags = SDF_WRITABLE;
282 s->range_table = &range_digital;
283 s->insn_bits = adq12b_do_insn_bits;
288 static void adq12b_detach(struct comedi_device *dev)
291 release_region(dev->iobase, ADQ12B_SIZE);
294 static struct comedi_driver adq12b_driver = {
295 .driver_name = "adq12b",
296 .module = THIS_MODULE,
297 .attach = adq12b_attach,
298 .detach = adq12b_detach,
300 module_comedi_driver(adq12b_driver);
302 MODULE_AUTHOR("Comedi http://www.comedi.org");
303 MODULE_DESCRIPTION("Comedi low-level driver");
304 MODULE_LICENSE("GPL");