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), PCM-A/D16 (pcmad16)
26 * This driver was written on a bet that I couldn't write a driver
27 * in less than 2 hours. I won the bet, but never got paid. =(
29 * Configuration options:
32 * [2] - Analog input reference (must match jumpers)
33 * 0 = single-ended (16 channels)
34 * 1 = differential (8 channels)
35 * [3] - Analog input encoding (must match jumpers)
36 * 0 = straight binary (0-5V input range)
37 * 1 = two's complement (+-10V input range)
40 #include <linux/module.h>
41 #include "../comedidev.h"
43 #define PCMAD_STATUS 0
46 #define PCMAD_CONVERT 1
48 struct pcmad_board_struct {
50 unsigned int ai_maxdata;
53 static const struct pcmad_board_struct pcmad_boards[] = {
63 static int pcmad_ai_eoc(struct comedi_device *dev,
64 struct comedi_subdevice *s,
65 struct comedi_insn *insn,
66 unsigned long context)
70 status = inb(dev->iobase + PCMAD_STATUS);
71 if ((status & 0x3) == 0x3)
76 static int pcmad_ai_insn_read(struct comedi_device *dev,
77 struct comedi_subdevice *s,
78 struct comedi_insn *insn,
81 unsigned int chan = CR_CHAN(insn->chanspec);
82 unsigned int range = CR_RANGE(insn->chanspec);
87 for (i = 0; i < insn->n; i++) {
88 outb(chan, dev->iobase + PCMAD_CONVERT);
90 ret = comedi_timeout(dev, s, insn, pcmad_ai_eoc, 0);
94 val = inb(dev->iobase + PCMAD_LSB) |
95 (inb(dev->iobase + PCMAD_MSB) << 8);
97 /* data is shifted on the pcmad12, fix it */
98 if (s->maxdata == 0x0fff)
101 if (comedi_range_is_bipolar(s, range)) {
102 /* munge the two's complement value */
103 val ^= ((s->maxdata + 1) >> 1);
112 static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
114 const struct pcmad_board_struct *board = dev->board_ptr;
115 struct comedi_subdevice *s;
118 ret = comedi_request_region(dev, it->options[0], 0x04);
122 ret = comedi_alloc_subdevices(dev, 1);
126 s = &dev->subdevices[0];
127 s->type = COMEDI_SUBD_AI;
128 if (it->options[1]) {
129 /* 8 differential channels */
130 s->subdev_flags = SDF_READABLE | AREF_DIFF;
133 /* 16 single-ended channels */
134 s->subdev_flags = SDF_READABLE | AREF_GROUND;
138 s->maxdata = board->ai_maxdata;
139 s->range_table = it->options[2] ? &range_bipolar10 : &range_unipolar5;
140 s->insn_read = pcmad_ai_insn_read;
145 static struct comedi_driver pcmad_driver = {
146 .driver_name = "pcmad",
147 .module = THIS_MODULE,
148 .attach = pcmad_attach,
149 .detach = comedi_legacy_detach,
150 .board_name = &pcmad_boards[0].name,
151 .num_names = ARRAY_SIZE(pcmad_boards),
152 .offset = sizeof(pcmad_boards[0]),
154 module_comedi_driver(pcmad_driver);
156 MODULE_AUTHOR("Comedi http://www.comedi.org");
157 MODULE_DESCRIPTION("Comedi low-level driver");
158 MODULE_LICENSE("GPL");