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 {
60 static const struct pcmad_board_struct pcmad_boards[] = {
71 #define this_board ((const struct pcmad_board_struct *)(dev->board_ptr))
72 #define n_pcmad_boards ARRAY_SIZE(pcmad_boards)
74 struct pcmad_priv_struct {
78 #define devpriv ((struct pcmad_priv_struct *)dev->private)
80 static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it);
81 static int pcmad_detach(struct comedi_device *dev);
82 static struct comedi_driver driver_pcmad = {
83 .driver_name = "pcmad",
84 .module = THIS_MODULE,
85 .attach = pcmad_attach,
86 .detach = pcmad_detach,
87 .board_name = &pcmad_boards[0].name,
88 .num_names = n_pcmad_boards,
89 .offset = sizeof(pcmad_boards[0]),
92 COMEDI_INITCLEANUP(driver_pcmad);
96 static int pcmad_ai_insn_read(struct comedi_device *dev,
97 struct comedi_subdevice *s,
98 struct comedi_insn *insn, unsigned int *data)
104 chan = CR_CHAN(insn->chanspec);
106 for (n = 0; n < insn->n; n++) {
107 outb(chan, dev->iobase + PCMAD_CONVERT);
109 for (i = 0; i < TIMEOUT; i++) {
110 if ((inb(dev->iobase + PCMAD_STATUS) & 0x3) == 0x3)
113 data[n] = inb(dev->iobase + PCMAD_LSB);
114 data[n] |= (inb(dev->iobase + PCMAD_MSB) << 8);
116 if (devpriv->twos_comp)
117 data[n] ^= (1 << (this_board->n_ai_bits - 1));
127 * 2 0=single ended 1=differential
128 * 3 0=straight binary 1=two's comp
130 static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
133 struct comedi_subdevice *s;
134 unsigned long iobase;
136 iobase = it->options[0];
137 printk(KERN_INFO "comedi%d: pcmad: 0x%04lx ", dev->minor, iobase);
138 if (!request_region(iobase, PCMAD_SIZE, "pcmad")) {
139 printk(KERN_CONT "I/O port conflict\n");
142 printk(KERN_CONT "\n");
143 dev->iobase = iobase;
145 ret = alloc_subdevices(dev, 1);
149 ret = alloc_private(dev, sizeof(struct pcmad_priv_struct));
153 dev->board_name = this_board->name;
155 s = dev->subdevices + 0;
156 s->type = COMEDI_SUBD_AI;
157 s->subdev_flags = SDF_READABLE | AREF_GROUND;
158 s->n_chan = 16; /* XXX */
160 s->insn_read = pcmad_ai_insn_read;
161 s->maxdata = (1 << this_board->n_ai_bits) - 1;
162 s->range_table = &range_unknown;
167 static int pcmad_detach(struct comedi_device *dev)
169 printk(KERN_INFO "comedi%d: pcmad: remove\n", dev->minor);
172 free_irq(dev->irq, dev);
175 release_region(dev->iobase, PCMAD_SIZE);