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