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Linux/drivers/staging/comedi/drivers/cb_pcimdda.c

  1 /*
  2     comedi/drivers/cb_pcimdda.c
  3     Computer Boards PCIM-DDA06-16 Comedi driver
  4     Author: Calin Culianu <calin@ajvar.org>
  5 
  6     COMEDI - Linux Control and Measurement Device Interface
  7     Copyright (C) 2000 David A. Schleef <ds@schleef.org>
  8 
  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.
 13 
 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.
 18 */
 19 /*
 20 Driver: cb_pcimdda
 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
 25 Status: works
 26 
 27 All features of the PCIM-DDA06-16 board are supported.  This board
 28 has 6 16-bit AO channels, and the usual 8255 DIO setup.  (24 channels,
 29 configurable in banks of 8 and 4, etc.).  This board does not support commands.
 30 
 31 The board has a peculiar way of specifying AO gain/range settings -- You have
 32 1 jumper bank on the card, which either makes all 6 AO channels either
 33 5 Volt unipolar, 5V bipolar, 10 Volt unipolar or 10V bipolar.
 34 
 35 Since there is absolutely _no_ way to tell in software how this jumper is set
 36 (well, at least according  to the rather thin spec. from Measurement Computing
 37  that comes with the board), the driver assumes the jumper is at its factory
 38 default setting of +/-5V.
 39 
 40 Also of note is the fact that this board features another jumper, whose
 41 state is also completely invisible to software.  It toggles two possible AO
 42 output modes on the board:
 43 
 44   - Update Mode: Writing to an AO channel instantaneously updates the actual
 45     signal output by the DAC on the board (this is the factory default).
 46   - Simultaneous XFER Mode: Writing to an AO channel has no effect until
 47     you read from any one of the AO channels.  This is useful for loading
 48     all 6 AO values, and then reading from any one of the AO channels on the
 49     device to instantly update all 6 AO values in unison.  Useful for some
 50     control apps, I would assume?  If your jumper is in this setting, then you
 51     need to issue your comedi_data_write()s to load all the values you want,
 52     then issue one comedi_data_read() on any channel on the AO subdevice
 53     to initiate the simultaneous XFER.
 54 
 55 Configuration Options: not applicable, uses PCI auto config
 56 */
 57 
 58 /*
 59     This is a driver for the Computer Boards PCIM-DDA06-16 Analog Output
 60     card.  This board has a unique register layout and as such probably
 61     deserves its own driver file.
 62 
 63     It is theoretically possible to integrate this board into the cb_pcidda
 64     file, but since that isn't my code, I didn't want to significantly
 65     modify that file to support this board (I thought it impolite to do so).
 66 
 67     At any rate, if you feel ambitious, please feel free to take
 68     the code out of this file and combine it with a more unified driver
 69     file.
 70 
 71     I would like to thank Timothy Curry <Timothy.Curry@rdec.redstone.army.mil>
 72     for lending me a board so that I could write this driver.
 73 
 74     -Calin Culianu <calin@ajvar.org>
 75  */
 76 
 77 #include <linux/module.h>
 78 #include <linux/pci.h>
 79 
 80 #include "../comedidev.h"
 81 
 82 #include "8255.h"
 83 
 84 /* device ids of the cards we support -- currently only 1 card supported */
 85 #define PCI_ID_PCIM_DDA06_16            0x0053
 86 
 87 /*
 88  * Register map, 8-bit access only
 89  */
 90 #define PCIMDDA_DA_CHAN(x)              (0x00 + (x) * 2)
 91 #define PCIMDDA_8255_BASE_REG           0x0c
 92 
 93 #define MAX_AO_READBACK_CHANNELS        6
 94 
 95 struct cb_pcimdda_private {
 96         unsigned int ao_readback[MAX_AO_READBACK_CHANNELS];
 97 };
 98 
 99 static int cb_pcimdda_ao_winsn(struct comedi_device *dev,
100                                struct comedi_subdevice *s,
101                                struct comedi_insn *insn,
102                                unsigned int *data)
103 {
104         struct cb_pcimdda_private *devpriv = dev->private;
105         unsigned int chan = CR_CHAN(insn->chanspec);
106         unsigned long offset = dev->iobase + PCIMDDA_DA_CHAN(chan);
107         unsigned int val = 0;
108         int i;
109 
110         for (i = 0; i < insn->n; i++) {
111                 val = data[i];
112 
113                 /*
114                  * Write the LSB then MSB.
115                  *
116                  * If the simultaneous xfer mode is selected by the
117                  * jumper on the card, a read instruction is needed
118                  * in order to initiate the simultaneous transfer.
119                  * Otherwise, the DAC will be updated when the MSB
120                  * is written.
121                  */
122                 outb(val & 0x00ff, offset);
123                 outb((val >> 8) & 0x00ff, offset + 1);
124         }
125 
126         /* Cache the last value for readback */
127         devpriv->ao_readback[chan] = val;
128 
129         return insn->n;
130 }
131 
132 static int cb_pcimdda_ao_rinsn(struct comedi_device *dev,
133                                struct comedi_subdevice *s,
134                                struct comedi_insn *insn,
135                                unsigned int *data)
136 {
137         struct cb_pcimdda_private *devpriv = dev->private;
138         int chan = CR_CHAN(insn->chanspec);
139         unsigned long offset = dev->iobase + PCIMDDA_DA_CHAN(chan);
140         int i;
141 
142         for (i = 0; i < insn->n; i++) {
143                 /* Initiate the simultaneous transfer */
144                 inw(offset);
145 
146                 data[i] = devpriv->ao_readback[chan];
147         }
148 
149         return insn->n;
150 }
151 
152 static int cb_pcimdda_auto_attach(struct comedi_device *dev,
153                                             unsigned long context_unused)
154 {
155         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
156         struct cb_pcimdda_private *devpriv;
157         struct comedi_subdevice *s;
158         int ret;
159 
160         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
161         if (!devpriv)
162                 return -ENOMEM;
163 
164         ret = comedi_pci_enable(dev);
165         if (ret)
166                 return ret;
167         dev->iobase = pci_resource_start(pcidev, 3);
168 
169         ret = comedi_alloc_subdevices(dev, 2);
170         if (ret)
171                 return ret;
172 
173         s = &dev->subdevices[0];
174         /* analog output subdevice */
175         s->type         = COMEDI_SUBD_AO;
176         s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
177         s->n_chan       = 6;
178         s->maxdata      = 0xffff;
179         s->range_table  = &range_bipolar5;
180         s->insn_write   = cb_pcimdda_ao_winsn;
181         s->insn_read    = cb_pcimdda_ao_rinsn;
182 
183         s = &dev->subdevices[1];
184         /* digital i/o subdevice */
185         ret = subdev_8255_init(dev, s, NULL,
186                         dev->iobase + PCIMDDA_8255_BASE_REG);
187         if (ret)
188                 return ret;
189 
190         return 0;
191 }
192 
193 static struct comedi_driver cb_pcimdda_driver = {
194         .driver_name    = "cb_pcimdda",
195         .module         = THIS_MODULE,
196         .auto_attach    = cb_pcimdda_auto_attach,
197         .detach         = comedi_pci_disable,
198 };
199 
200 static int cb_pcimdda_pci_probe(struct pci_dev *dev,
201                                 const struct pci_device_id *id)
202 {
203         return comedi_pci_auto_config(dev, &cb_pcimdda_driver,
204                                       id->driver_data);
205 }
206 
207 static const struct pci_device_id cb_pcimdda_pci_table[] = {
208         { PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_ID_PCIM_DDA06_16) },
209         { 0 }
210 };
211 MODULE_DEVICE_TABLE(pci, cb_pcimdda_pci_table);
212 
213 static struct pci_driver cb_pcimdda_driver_pci_driver = {
214         .name           = "cb_pcimdda",
215         .id_table       = cb_pcimdda_pci_table,
216         .probe          = cb_pcimdda_pci_probe,
217         .remove         = comedi_pci_auto_unconfig,
218 };
219 module_comedi_pci_driver(cb_pcimdda_driver, cb_pcimdda_driver_pci_driver);
220 
221 MODULE_AUTHOR("Calin A. Culianu <calin@rtlab.org>");
222 MODULE_DESCRIPTION("Comedi low-level driver for the Computerboards PCIM-DDA "
223                    "series.  Currently only supports PCIM-DDA06-16 (which "
224                    "also happens to be the only board in this series. :) ) ");
225 MODULE_LICENSE("GPL");
226 

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