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.
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: Winsystems PCM-A/D12, PCM-A/D16
27 Devices: [Winsystems] PCM-A/D12 (pcmad12), PCM-A/D16 (pcmad16)
30 This driver was written on a bet that I couldn't write a driver
31 in less than 2 hours. I won the bet, but never got paid. =(
33 Configuration options:
36 [2] - Analog input reference
39 [3] - Analog input encoding (must match jumpers)
44 #include <linux/interrupt.h>
45 #include "../comedidev.h"
47 #include <linux/ioport.h>
51 #define PCMAD_STATUS 0
54 #define PCMAD_CONVERT 1
56 struct pcmad_board_struct {
61 struct pcmad_priv_struct {
65 #define devpriv ((struct pcmad_priv_struct *)dev->private)
69 static int pcmad_ai_insn_read(struct comedi_device *dev,
70 struct comedi_subdevice *s,
71 struct comedi_insn *insn, unsigned int *data)
73 const struct pcmad_board_struct *board = comedi_board(dev);
78 chan = CR_CHAN(insn->chanspec);
80 for (n = 0; n < insn->n; n++) {
81 outb(chan, dev->iobase + PCMAD_CONVERT);
83 for (i = 0; i < TIMEOUT; i++) {
84 if ((inb(dev->iobase + PCMAD_STATUS) & 0x3) == 0x3)
87 data[n] = inb(dev->iobase + PCMAD_LSB);
88 data[n] |= (inb(dev->iobase + PCMAD_MSB) << 8);
90 if (devpriv->twos_comp)
91 data[n] ^= (1 << (board->n_ai_bits - 1));
101 * 2 0=single ended 1=differential
102 * 3 0=straight binary 1=two's comp
104 static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
106 const struct pcmad_board_struct *board = comedi_board(dev);
108 struct comedi_subdevice *s;
109 unsigned long iobase;
111 iobase = it->options[0];
112 printk(KERN_INFO "comedi%d: pcmad: 0x%04lx ", dev->minor, iobase);
113 if (!request_region(iobase, PCMAD_SIZE, "pcmad")) {
114 printk(KERN_CONT "I/O port conflict\n");
117 printk(KERN_CONT "\n");
118 dev->iobase = iobase;
120 ret = comedi_alloc_subdevices(dev, 1);
124 ret = alloc_private(dev, sizeof(struct pcmad_priv_struct));
128 dev->board_name = board->name;
130 s = dev->subdevices + 0;
131 s->type = COMEDI_SUBD_AI;
132 s->subdev_flags = SDF_READABLE | AREF_GROUND;
133 s->n_chan = 16; /* XXX */
135 s->insn_read = pcmad_ai_insn_read;
136 s->maxdata = (1 << board->n_ai_bits) - 1;
137 s->range_table = &range_unknown;
142 static void pcmad_detach(struct comedi_device *dev)
145 free_irq(dev->irq, dev);
147 release_region(dev->iobase, PCMAD_SIZE);
150 static const struct pcmad_board_struct pcmad_boards[] = {
159 static struct comedi_driver pcmad_driver = {
160 .driver_name = "pcmad",
161 .module = THIS_MODULE,
162 .attach = pcmad_attach,
163 .detach = pcmad_detach,
164 .board_name = &pcmad_boards[0].name,
165 .num_names = ARRAY_SIZE(pcmad_boards),
166 .offset = sizeof(pcmad_boards[0]),
168 module_comedi_driver(pcmad_driver);
170 MODULE_AUTHOR("Comedi http://www.comedi.org");
171 MODULE_DESCRIPTION("Comedi low-level driver");
172 MODULE_LICENSE("GPL");