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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 
 79 #include "../comedi_pci.h"
 80 
 81 #include "8255.h"
 82 
 83 /* device ids of the cards we support -- currently only 1 card supported */
 84 #define PCI_ID_PCIM_DDA06_16            0x0053
 85 
 86 /*
 87  * Register map, 8-bit access only
 88  */
 89 #define PCIMDDA_DA_CHAN(x)              (0x00 + (x) * 2)
 90 #define PCIMDDA_8255_BASE_REG           0x0c
 91 
 92 static int cb_pcimdda_ao_insn_write(struct comedi_device *dev,
 93                                     struct comedi_subdevice *s,
 94                                     struct comedi_insn *insn,
 95                                     unsigned int *data)
 96 {
 97         unsigned int chan = CR_CHAN(insn->chanspec);
 98         unsigned long offset = dev->iobase + PCIMDDA_DA_CHAN(chan);
 99         unsigned int val = s->readback[chan];
100         int i;
101 
102         for (i = 0; i < insn->n; i++) {
103                 val = data[i];
104 
105                 /*
106                  * Write the LSB then MSB.
107                  *
108                  * If the simultaneous xfer mode is selected by the
109                  * jumper on the card, a read instruction is needed
110                  * in order to initiate the simultaneous transfer.
111                  * Otherwise, the DAC will be updated when the MSB
112                  * is written.
113                  */
114                 outb(val & 0x00ff, offset);
115                 outb((val >> 8) & 0x00ff, offset + 1);
116         }
117         s->readback[chan] = val;
118 
119         return insn->n;
120 }
121 
122 static int cb_pcimdda_ao_insn_read(struct comedi_device *dev,
123                                    struct comedi_subdevice *s,
124                                    struct comedi_insn *insn,
125                                    unsigned int *data)
126 {
127         unsigned int chan = CR_CHAN(insn->chanspec);
128 
129         /* Initiate the simultaneous transfer */
130         inw(dev->iobase + PCIMDDA_DA_CHAN(chan));
131 
132         return comedi_readback_insn_read(dev, s, insn, data);
133 }
134 
135 static int cb_pcimdda_auto_attach(struct comedi_device *dev,
136                                   unsigned long context_unused)
137 {
138         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
139         struct comedi_subdevice *s;
140         int ret;
141 
142         ret = comedi_pci_enable(dev);
143         if (ret)
144                 return ret;
145         dev->iobase = pci_resource_start(pcidev, 3);
146 
147         ret = comedi_alloc_subdevices(dev, 2);
148         if (ret)
149                 return ret;
150 
151         s = &dev->subdevices[0];
152         /* analog output subdevice */
153         s->type         = COMEDI_SUBD_AO;
154         s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
155         s->n_chan       = 6;
156         s->maxdata      = 0xffff;
157         s->range_table  = &range_bipolar5;
158         s->insn_write   = cb_pcimdda_ao_insn_write;
159         s->insn_read    = cb_pcimdda_ao_insn_read;
160 
161         ret = comedi_alloc_subdev_readback(s);
162         if (ret)
163                 return ret;
164 
165         s = &dev->subdevices[1];
166         /* digital i/o subdevice */
167         ret = subdev_8255_init(dev, s, NULL, PCIMDDA_8255_BASE_REG);
168         if (ret)
169                 return ret;
170 
171         return 0;
172 }
173 
174 static struct comedi_driver cb_pcimdda_driver = {
175         .driver_name    = "cb_pcimdda",
176         .module         = THIS_MODULE,
177         .auto_attach    = cb_pcimdda_auto_attach,
178         .detach         = comedi_pci_detach,
179 };
180 
181 static int cb_pcimdda_pci_probe(struct pci_dev *dev,
182                                 const struct pci_device_id *id)
183 {
184         return comedi_pci_auto_config(dev, &cb_pcimdda_driver,
185                                       id->driver_data);
186 }
187 
188 static const struct pci_device_id cb_pcimdda_pci_table[] = {
189         { PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_ID_PCIM_DDA06_16) },
190         { 0 }
191 };
192 MODULE_DEVICE_TABLE(pci, cb_pcimdda_pci_table);
193 
194 static struct pci_driver cb_pcimdda_driver_pci_driver = {
195         .name           = "cb_pcimdda",
196         .id_table       = cb_pcimdda_pci_table,
197         .probe          = cb_pcimdda_pci_probe,
198         .remove         = comedi_pci_auto_unconfig,
199 };
200 module_comedi_pci_driver(cb_pcimdda_driver, cb_pcimdda_driver_pci_driver);
201 
202 MODULE_AUTHOR("Calin A. Culianu <calin@rtlab.org>");
203 MODULE_DESCRIPTION("Comedi low-level driver for the Computerboards PCIM-DDA "
204                    "series.  Currently only supports PCIM-DDA06-16 (which "
205                    "also happens to be the only board in this series. :) ) ");
206 MODULE_LICENSE("GPL");
207 

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