1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*
* comedi/drivers/cb_pcimdda.c
* Computer Boards PCIM-DDA06-16 Comedi driver
* Author: Calin Culianu <calin@ajvar.org>
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 2000 David A. Schleef <ds@schleef.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/*
* Driver: cb_pcimdda
* Description: Measurement Computing PCIM-DDA06-16
* Devices: [Measurement Computing] PCIM-DDA06-16 (cb_pcimdda)
* Author: Calin Culianu <calin@ajvar.org>
* Updated: Mon, 14 Apr 2008 15:15:51 +0100
* Status: works
*
* All features of the PCIM-DDA06-16 board are supported.
* This board has 6 16-bit AO channels, and the usual 8255 DIO setup.
* (24 channels, configurable in banks of 8 and 4, etc.).
* This board does not support commands.
*
* The board has a peculiar way of specifying AO gain/range settings -- You have
* 1 jumper bank on the card, which either makes all 6 AO channels either
* 5 Volt unipolar, 5V bipolar, 10 Volt unipolar or 10V bipolar.
*
* Since there is absolutely _no_ way to tell in software how this jumper is set
* (well, at least according to the rather thin spec. from Measurement Computing
* that comes with the board), the driver assumes the jumper is at its factory
* default setting of +/-5V.
*
* Also of note is the fact that this board features another jumper, whose
* state is also completely invisible to software. It toggles two possible AO
* output modes on the board:
*
* - Update Mode: Writing to an AO channel instantaneously updates the actual
* signal output by the DAC on the board (this is the factory default).
* - Simultaneous XFER Mode: Writing to an AO channel has no effect until
* you read from any one of the AO channels. This is useful for loading
* all 6 AO values, and then reading from any one of the AO channels on the
* device to instantly update all 6 AO values in unison. Useful for some
* control apps, I would assume? If your jumper is in this setting, then you
* need to issue your comedi_data_write()s to load all the values you want,
* then issue one comedi_data_read() on any channel on the AO subdevice
* to initiate the simultaneous XFER.
*
* Configuration Options: not applicable, uses PCI auto config
*/
/*
* This is a driver for the Computer Boards PCIM-DDA06-16 Analog Output
* card. This board has a unique register layout and as such probably
* deserves its own driver file.
*
* It is theoretically possible to integrate this board into the cb_pcidda
* file, but since that isn't my code, I didn't want to significantly
* modify that file to support this board (I thought it impolite to do so).
*
* At any rate, if you feel ambitious, please feel free to take
* the code out of this file and combine it with a more unified driver
* file.
*
* I would like to thank Timothy Curry <Timothy.Curry@rdec.redstone.army.mil>
* for lending me a board so that I could write this driver.
*
* -Calin Culianu <calin@ajvar.org>
*/
#include <linux/module.h>
#include "../comedi_pci.h"
#include "8255.h"
/* device ids of the cards we support -- currently only 1 card supported */
#define PCI_ID_PCIM_DDA06_16 0x0053
/*
* Register map, 8-bit access only
*/
#define PCIMDDA_DA_CHAN(x) (0x00 + (x) * 2)
#define PCIMDDA_8255_BASE_REG 0x0c
static int cb_pcimdda_ao_insn_write(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned long offset = dev->iobase + PCIMDDA_DA_CHAN(chan);
unsigned int val = s->readback[chan];
int i;
for (i = 0; i < insn->n; i++) {
val = data[i];
/*
* Write the LSB then MSB.
*
* If the simultaneous xfer mode is selected by the
* jumper on the card, a read instruction is needed
* in order to initiate the simultaneous transfer.
* Otherwise, the DAC will be updated when the MSB
* is written.
*/
outb(val & 0x00ff, offset);
outb((val >> 8) & 0x00ff, offset + 1);
}
s->readback[chan] = val;
return insn->n;
}
static int cb_pcimdda_ao_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
{
unsigned int chan = CR_CHAN(insn->chanspec);
/* Initiate the simultaneous transfer */
inw(dev->iobase + PCIMDDA_DA_CHAN(chan));
return comedi_readback_insn_read(dev, s, insn, data);
}
static int cb_pcimdda_auto_attach(struct comedi_device *dev,
unsigned long context_unused)
{
struct pci_dev *pcidev = comedi_to_pci_dev(dev);
struct comedi_subdevice *s;
int ret;
ret = comedi_pci_enable(dev);
if (ret)
return ret;
dev->iobase = pci_resource_start(pcidev, 3);
ret = comedi_alloc_subdevices(dev, 2);
if (ret)
return ret;
s = &dev->subdevices[0];
/* analog output subdevice */
s->type = COMEDI_SUBD_AO;
s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
s->n_chan = 6;
s->maxdata = 0xffff;
s->range_table = &range_bipolar5;
s->insn_write = cb_pcimdda_ao_insn_write;
s->insn_read = cb_pcimdda_ao_insn_read;
ret = comedi_alloc_subdev_readback(s);
if (ret)
return ret;
s = &dev->subdevices[1];
/* digital i/o subdevice */
return subdev_8255_init(dev, s, NULL, PCIMDDA_8255_BASE_REG);
}
static struct comedi_driver cb_pcimdda_driver = {
.driver_name = "cb_pcimdda",
.module = THIS_MODULE,
.auto_attach = cb_pcimdda_auto_attach,
.detach = comedi_pci_detach,
};
static int cb_pcimdda_pci_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
return comedi_pci_auto_config(dev, &cb_pcimdda_driver,
id->driver_data);
}
static const struct pci_device_id cb_pcimdda_pci_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_ID_PCIM_DDA06_16) },
{ 0 }
};
MODULE_DEVICE_TABLE(pci, cb_pcimdda_pci_table);
static struct pci_driver cb_pcimdda_driver_pci_driver = {
.name = "cb_pcimdda",
.id_table = cb_pcimdda_pci_table,
.probe = cb_pcimdda_pci_probe,
.remove = comedi_pci_auto_unconfig,
};
module_comedi_pci_driver(cb_pcimdda_driver, cb_pcimdda_driver_pci_driver);
MODULE_AUTHOR("Calin A. Culianu <calin@rtlab.org>");
MODULE_DESCRIPTION("Comedi low-level driver for the Computerboards PCIM-DDA "
"series. Currently only supports PCIM-DDA06-16 (which "
"also happens to be the only board in this series. :) ) ");
MODULE_LICENSE("GPL");
|
