1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * adq12b.c
4 * Driver for MicroAxial ADQ12-B data acquisition and control card
5 * written by jeremy theler <thelerg@ib.cnea.gov.ar>
6 * instituto balseiro
7 * commission nacional de energia atomica
8 * universidad nacional de cuyo
9 * argentina
10 *
11 * COMEDI - Linux Control and Measurement Device Interface
12 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
13 */
14
15/*
16 * Driver: adq12b
17 * Description: Driver for MicroAxial ADQ12-B data acquisition and control card
18 * Devices: [MicroAxial] ADQ12-B (adq12b)
19 * Author: jeremy theler <thelerg@ib.cnea.gov.ar>
20 * Updated: Thu, 21 Feb 2008 02:56:27 -0300
21 * Status: works
22 *
23 * Configuration options:
24 * [0] - I/O base address (set with hardware jumpers)
25 * address jumper JADR
26 * 0x300 1 (factory default)
27 * 0x320 2
28 * 0x340 3
29 * 0x360 4
30 * 0x380 5
31 * 0x3A0 6
32 * [1] - Analog Input unipolar/bipolar selection
33 * selection option JUB
34 * bipolar 0 2-3 (factory default)
35 * unipolar 1 1-2
36 * [2] - Analog Input single-ended/differential selection
37 * selection option JCHA JCHB
38 * single-ended 0 1-2 1-2 (factory default)
39 * differential 1 2-3 2-3
40 *
41 * Driver for the acquisition card ADQ12-B (without any add-on).
42 *
43 * - Analog input is subdevice 0 (16 channels single-ended or 8 differential)
44 * - Digital input is subdevice 1 (5 channels)
45 * - Digital output is subdevice 1 (8 channels)
46 * - The PACER is not supported in this version
47 */
48
49#include <linux/module.h>
50#include <linux/delay.h>
51#include <linux/comedi/comedidev.h>
52
53/* address scheme (page 2.17 of the manual) */
54#define ADQ12B_CTREG 0x00
55#define ADQ12B_CTREG_MSKP BIT(7) /* enable pacer interrupt */
56#define ADQ12B_CTREG_GTP BIT(6) /* enable pacer */
57#define ADQ12B_CTREG_RANGE(x) ((x) << 4)
58#define ADQ12B_CTREG_CHAN(x) ((x) << 0)
59#define ADQ12B_STINR 0x00
60#define ADQ12B_STINR_OUT2 BIT(7) /* timer 2 output state */
61#define ADQ12B_STINR_OUTP BIT(6) /* pacer output state */
62#define ADQ12B_STINR_EOC BIT(5) /* A/D end-of-conversion */
63#define ADQ12B_STINR_IN_MASK (0x1f << 0)
64#define ADQ12B_OUTBR 0x04
65#define ADQ12B_ADLOW 0x08
66#define ADQ12B_ADHIG 0x09
67#define ADQ12B_TIMER_BASE 0x0c
68
69/* available ranges through the PGA gains */
70static const struct comedi_lrange range_adq12b_ai_bipolar = {
71 4, {
72 BIP_RANGE(5),
73 BIP_RANGE(2),
74 BIP_RANGE(1),
75 BIP_RANGE(0.5)
76 }
77};
78
79static const struct comedi_lrange range_adq12b_ai_unipolar = {
80 4, {
81 UNI_RANGE(5),
82 UNI_RANGE(2),
83 UNI_RANGE(1),
84 UNI_RANGE(0.5)
85 }
86};
87
88struct adq12b_private {
89 unsigned int last_ctreg;
90};
91
92static int adq12b_ai_eoc(struct comedi_device *dev,
93 struct comedi_subdevice *s,
94 struct comedi_insn *insn,
95 unsigned long context)
96{
97 unsigned char status;
98
99 status = inb(port: dev->iobase + ADQ12B_STINR);
100 if (status & ADQ12B_STINR_EOC)
101 return 0;
102 return -EBUSY;
103}
104
105static int adq12b_ai_insn_read(struct comedi_device *dev,
106 struct comedi_subdevice *s,
107 struct comedi_insn *insn,
108 unsigned int *data)
109{
110 struct adq12b_private *devpriv = dev->private;
111 unsigned int chan = CR_CHAN(insn->chanspec);
112 unsigned int range = CR_RANGE(insn->chanspec);
113 unsigned int val;
114 int ret;
115 int i;
116
117 /* change channel and range only if it is different from the previous */
118 val = ADQ12B_CTREG_RANGE(range) | ADQ12B_CTREG_CHAN(chan);
119 if (val != devpriv->last_ctreg) {
120 outb(value: val, port: dev->iobase + ADQ12B_CTREG);
121 devpriv->last_ctreg = val;
122 usleep_range(min: 50, max: 100); /* wait for the mux to settle */
123 }
124
125 val = inb(port: dev->iobase + ADQ12B_ADLOW); /* trigger A/D */
126
127 for (i = 0; i < insn->n; i++) {
128 ret = comedi_timeout(dev, s, insn, cb: adq12b_ai_eoc, context: 0);
129 if (ret)
130 return ret;
131
132 val = inb(port: dev->iobase + ADQ12B_ADHIG) << 8;
133 val |= inb(port: dev->iobase + ADQ12B_ADLOW); /* retriggers A/D */
134
135 data[i] = val;
136 }
137
138 return insn->n;
139}
140
141static int adq12b_di_insn_bits(struct comedi_device *dev,
142 struct comedi_subdevice *s,
143 struct comedi_insn *insn, unsigned int *data)
144{
145 /* only bits 0-4 have information about digital inputs */
146 data[1] = (inb(port: dev->iobase + ADQ12B_STINR) & ADQ12B_STINR_IN_MASK);
147
148 return insn->n;
149}
150
151static int adq12b_do_insn_bits(struct comedi_device *dev,
152 struct comedi_subdevice *s,
153 struct comedi_insn *insn,
154 unsigned int *data)
155{
156 unsigned int mask;
157 unsigned int chan;
158 unsigned int val;
159
160 mask = comedi_dio_update_state(s, data);
161 if (mask) {
162 for (chan = 0; chan < 8; chan++) {
163 if ((mask >> chan) & 0x01) {
164 val = (s->state >> chan) & 0x01;
165 outb(value: (val << 3) | chan,
166 port: dev->iobase + ADQ12B_OUTBR);
167 }
168 }
169 }
170
171 data[1] = s->state;
172
173 return insn->n;
174}
175
176static int adq12b_attach(struct comedi_device *dev, struct comedi_devconfig *it)
177{
178 struct adq12b_private *devpriv;
179 struct comedi_subdevice *s;
180 int ret;
181
182 ret = comedi_request_region(dev, start: it->options[0], len: 0x10);
183 if (ret)
184 return ret;
185
186 devpriv = comedi_alloc_devpriv(dev, size: sizeof(*devpriv));
187 if (!devpriv)
188 return -ENOMEM;
189
190 devpriv->last_ctreg = -1; /* force ctreg update */
191
192 ret = comedi_alloc_subdevices(dev, num_subdevices: 3);
193 if (ret)
194 return ret;
195
196 /* Analog Input subdevice */
197 s = &dev->subdevices[0];
198 s->type = COMEDI_SUBD_AI;
199 if (it->options[2]) {
200 s->subdev_flags = SDF_READABLE | SDF_DIFF;
201 s->n_chan = 8;
202 } else {
203 s->subdev_flags = SDF_READABLE | SDF_GROUND;
204 s->n_chan = 16;
205 }
206 s->maxdata = 0xfff;
207 s->range_table = it->options[1] ? &range_adq12b_ai_unipolar
208 : &range_adq12b_ai_bipolar;
209 s->insn_read = adq12b_ai_insn_read;
210
211 /* Digital Input subdevice */
212 s = &dev->subdevices[1];
213 s->type = COMEDI_SUBD_DI;
214 s->subdev_flags = SDF_READABLE;
215 s->n_chan = 5;
216 s->maxdata = 1;
217 s->range_table = &range_digital;
218 s->insn_bits = adq12b_di_insn_bits;
219
220 /* Digital Output subdevice */
221 s = &dev->subdevices[2];
222 s->type = COMEDI_SUBD_DO;
223 s->subdev_flags = SDF_WRITABLE;
224 s->n_chan = 8;
225 s->maxdata = 1;
226 s->range_table = &range_digital;
227 s->insn_bits = adq12b_do_insn_bits;
228
229 return 0;
230}
231
232static struct comedi_driver adq12b_driver = {
233 .driver_name = "adq12b",
234 .module = THIS_MODULE,
235 .attach = adq12b_attach,
236 .detach = comedi_legacy_detach,
237};
238module_comedi_driver(adq12b_driver);
239
240MODULE_AUTHOR("Comedi https://www.comedi.org");
241MODULE_DESCRIPTION("Comedi low-level driver");
242MODULE_LICENSE("GPL");
243

source code of linux/drivers/comedi/drivers/adq12b.c