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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 static int cb_pcimdda_ao_insn_write(struct comedi_device *dev,
 94                                     struct comedi_subdevice *s,
 95                                     struct comedi_insn *insn,
 96                                     unsigned int *data)
 97 {
 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];
101         int i;
102 
103         for (i = 0; i < insn->n; i++) {
104                 val = data[i];
105 
106                 /*
107                  * Write the LSB then MSB.
108                  *
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
113                  * is written.
114                  */
115                 outb(val & 0x00ff, offset);
116                 outb((val >> 8) & 0x00ff, offset + 1);
117         }
118         s->readback[chan] = val;
119 
120         return insn->n;
121 }
122 
123 static int cb_pcimdda_ao_insn_read(struct comedi_device *dev,
124                                    struct comedi_subdevice *s,
125                                    struct comedi_insn *insn,
126                                    unsigned int *data)
127 {
128         unsigned int chan = CR_CHAN(insn->chanspec);
129 
130         /* Initiate the simultaneous transfer */
131         inw(dev->iobase + PCIMDDA_DA_CHAN(chan));
132 
133         return comedi_readback_insn_read(dev, s, insn, data);
134 }
135 
136 static int cb_pcimdda_auto_attach(struct comedi_device *dev,
137                                             unsigned long context_unused)
138 {
139         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
140         struct comedi_subdevice *s;
141         int ret;
142 
143         ret = comedi_pci_enable(dev);
144         if (ret)
145                 return ret;
146         dev->iobase = pci_resource_start(pcidev, 3);
147 
148         ret = comedi_alloc_subdevices(dev, 2);
149         if (ret)
150                 return ret;
151 
152         s = &dev->subdevices[0];
153         /* analog output subdevice */
154         s->type         = COMEDI_SUBD_AO;
155         s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
156         s->n_chan       = 6;
157         s->maxdata      = 0xffff;
158         s->range_table  = &range_bipolar5;
159         s->insn_write   = cb_pcimdda_ao_insn_write;
160         s->insn_read    = cb_pcimdda_ao_insn_read;
161 
162         ret = comedi_alloc_subdev_readback(s);
163         if (ret)
164                 return ret;
165 
166         s = &dev->subdevices[1];
167         /* digital i/o subdevice */
168         ret = subdev_8255_init(dev, s, NULL, PCIMDDA_8255_BASE_REG);
169         if (ret)
170                 return ret;
171 
172         return 0;
173 }
174 
175 static struct comedi_driver cb_pcimdda_driver = {
176         .driver_name    = "cb_pcimdda",
177         .module         = THIS_MODULE,
178         .auto_attach    = cb_pcimdda_auto_attach,
179         .detach         = comedi_pci_detach,
180 };
181 
182 static int cb_pcimdda_pci_probe(struct pci_dev *dev,
183                                 const struct pci_device_id *id)
184 {
185         return comedi_pci_auto_config(dev, &cb_pcimdda_driver,
186                                       id->driver_data);
187 }
188 
189 static const struct pci_device_id cb_pcimdda_pci_table[] = {
190         { PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_ID_PCIM_DDA06_16) },
191         { 0 }
192 };
193 MODULE_DEVICE_TABLE(pci, cb_pcimdda_pci_table);
194 
195 static struct pci_driver cb_pcimdda_driver_pci_driver = {
196         .name           = "cb_pcimdda",
197         .id_table       = cb_pcimdda_pci_table,
198         .probe          = cb_pcimdda_pci_probe,
199         .remove         = comedi_pci_auto_unconfig,
200 };
201 module_comedi_pci_driver(cb_pcimdda_driver, cb_pcimdda_driver_pci_driver);
202 
203 MODULE_AUTHOR("Calin A. Culianu <calin@rtlab.org>");
204 MODULE_DESCRIPTION("Comedi low-level driver for the Computerboards PCIM-DDA "
205                    "series.  Currently only supports PCIM-DDA06-16 (which "
206                    "also happens to be the only board in this series. :) ) ");
207 MODULE_LICENSE("GPL");
208 

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