3 * Hardware driver for Winsystems PCM-A/D12 and PCM-A/D16
5 * COMEDI - Linux Control and Measurement Device Interface
6 * Copyright (C) 2000,2001 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.
21 * Description: Winsystems PCM-A/D12, PCM-A/D16
22 * Devices: (Winsystems) PCM-A/D12 [pcmad12]
23 * (Winsystems) PCM-A/D16 [pcmad16]
27 * This driver was written on a bet that I couldn't write a driver
28 * in less than 2 hours. I won the bet, but never got paid. =(
30 * Configuration options:
33 * [2] - Analog input reference (must match jumpers)
34 * 0 = single-ended (16 channels)
35 * 1 = differential (8 channels)
36 * [3] - Analog input encoding (must match jumpers)
37 * 0 = straight binary (0-5V input range)
38 * 1 = two's complement (+-10V input range)
41 #include <linux/module.h>
42 #include "../comedidev.h"
44 #define PCMAD_STATUS 0
47 #define PCMAD_CONVERT 1
49 struct pcmad_board_struct {
51 unsigned int ai_maxdata;
54 static const struct pcmad_board_struct pcmad_boards[] = {
64 static int pcmad_ai_eoc(struct comedi_device *dev,
65 struct comedi_subdevice *s,
66 struct comedi_insn *insn,
67 unsigned long context)
71 status = inb(dev->iobase + PCMAD_STATUS);
72 if ((status & 0x3) == 0x3)
77 static int pcmad_ai_insn_read(struct comedi_device *dev,
78 struct comedi_subdevice *s,
79 struct comedi_insn *insn,
82 unsigned int chan = CR_CHAN(insn->chanspec);
83 unsigned int range = CR_RANGE(insn->chanspec);
88 for (i = 0; i < insn->n; i++) {
89 outb(chan, dev->iobase + PCMAD_CONVERT);
91 ret = comedi_timeout(dev, s, insn, pcmad_ai_eoc, 0);
95 val = inb(dev->iobase + PCMAD_LSB) |
96 (inb(dev->iobase + PCMAD_MSB) << 8);
98 /* data is shifted on the pcmad12, fix it */
99 if (s->maxdata == 0x0fff)
102 if (comedi_range_is_bipolar(s, range)) {
103 /* munge the two's complement value */
104 val ^= ((s->maxdata + 1) >> 1);
113 static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
115 const struct pcmad_board_struct *board = comedi_board(dev);
116 struct comedi_subdevice *s;
119 ret = comedi_request_region(dev, it->options[0], 0x04);
123 ret = comedi_alloc_subdevices(dev, 1);
127 s = &dev->subdevices[0];
128 s->type = COMEDI_SUBD_AI;
129 if (it->options[1]) {
130 /* 8 differential channels */
131 s->subdev_flags = SDF_READABLE | AREF_DIFF;
134 /* 16 single-ended channels */
135 s->subdev_flags = SDF_READABLE | AREF_GROUND;
139 s->maxdata = board->ai_maxdata;
140 s->range_table = it->options[2] ? &range_bipolar10 : &range_unipolar5;
141 s->insn_read = pcmad_ai_insn_read;
146 static struct comedi_driver pcmad_driver = {
147 .driver_name = "pcmad",
148 .module = THIS_MODULE,
149 .attach = pcmad_attach,
150 .detach = comedi_legacy_detach,
151 .board_name = &pcmad_boards[0].name,
152 .num_names = ARRAY_SIZE(pcmad_boards),
153 .offset = sizeof(pcmad_boards[0]),
155 module_comedi_driver(pcmad_driver);
157 MODULE_AUTHOR("Comedi http://www.comedi.org");
158 MODULE_DESCRIPTION("Comedi low-level driver");
159 MODULE_LICENSE("GPL");