drivers/staging/comedi/drivers/dt2815.c

   1 /*
   2    comedi/drivers/dt2815.c
   3    Hardware driver for Data Translation DT2815
   4
   5    COMEDI - Linux Control and Measurement Device Interface
   6    Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17  */
  18 /*
  19 Driver: dt2815
  20 Description: Data Translation DT2815
  21 Author: ds
  22 Status: mostly complete, untested
  23 Devices: [Data Translation] DT2815 (dt2815)
  24
  25 I'm not sure anyone has ever tested this board.  If you have information
  26 contrary, please update.
  27
  28 Configuration options:
  29   [0] - I/O port base base address
  30   [1] - IRQ (unused)
  31   [2] - Voltage unipolar/bipolar configuration
  32         0 == unipolar 5V  (0V -- +5V)
  33         1 == bipolar 5V  (-5V -- +5V)
  34   [3] - Current offset configuration
  35         0 == disabled  (0mA -- +32mAV)
  36         1 == enabled  (+4mA -- +20mAV)
  37   [4] - Firmware program configuration
  38         0 == program 1 (see manual table 5-4)
  39         1 == program 2 (see manual table 5-4)
  40         2 == program 3 (see manual table 5-4)
  41         3 == program 4 (see manual table 5-4)
  42   [5] - Analog output 0 range configuration
  43         0 == voltage
  44         1 == current
  45   [6] - Analog output 1 range configuration (same options)
  46   [7] - Analog output 2 range configuration (same options)
  47   [8] - Analog output 3 range configuration (same options)
  48   [9] - Analog output 4 range configuration (same options)
  49   [10] - Analog output 5 range configuration (same options)
  50   [11] - Analog output 6 range configuration (same options)
  51   [12] - Analog output 7 range configuration (same options)
  52 */
  53
  54 #include <linux/module.h>
  55 #include "../comedidev.h"
  56
  57 #include <linux/delay.h>
  58
  59 #define DT2815_DATA 0
  60 #define DT2815_STATUS 1
  61
  62 struct dt2815_private {
  63         const struct comedi_lrange *range_type_list[8];
  64         unsigned int ao_readback[8];
  65 };
  66
  67 static int dt2815_ao_status(struct comedi_device *dev,
  68                             struct comedi_subdevice *s,
  69                             struct comedi_insn *insn,
  70                             unsigned long context)
  71 {
  72         unsigned int status;
  73
  74         status = inb(dev->iobase + DT2815_STATUS);
  75         if (status == context)
  76                 return 0;
  77         return -EBUSY;
  78 }
  79
  80 static int dt2815_ao_insn_read(struct comedi_device *dev,
  81                                struct comedi_subdevice *s,
  82                                struct comedi_insn *insn, unsigned int *data)
  83 {
  84         struct dt2815_private *devpriv = dev->private;
  85         int i;
  86         int chan = CR_CHAN(insn->chanspec);
  87
  88         for (i = 0; i < insn->n; i++)
  89                 data[i] = devpriv->ao_readback[chan];
  90
  91         return i;
  92 }
  93
  94 static int dt2815_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s,
  95                           struct comedi_insn *insn, unsigned int *data)
  96 {
  97         struct dt2815_private *devpriv = dev->private;
  98         int i;
  99         int chan = CR_CHAN(insn->chanspec);
 100         unsigned int lo, hi;
 101         int ret;
 102
 103         for (i = 0; i < insn->n; i++) {
 104                 lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01;
 105                 hi = (data[i] & 0xff0) >> 4;
 106
 107                 ret = comedi_timeout(dev, s, insn, dt2815_ao_status, 0x00);
 108                 if (ret)
 109                         return ret;
 110
 111                 outb(lo, dev->iobase + DT2815_DATA);
 112
 113                 ret = comedi_timeout(dev, s, insn, dt2815_ao_status, 0x10);
 114                 if (ret)
 115                         return ret;
 116
 117                 devpriv->ao_readback[chan] = data[i];
 118         }
 119         return i;
 120 }
 121
 122 /*
 123   options[0]   Board base address
 124   options[1]   IRQ (not applicable)
 125   options[2]   Voltage unipolar/bipolar configuration
 126                 0 == unipolar 5V  (0V -- +5V)
 127                 1 == bipolar 5V  (-5V -- +5V)
 128   options[3]   Current offset configuration
 129                 0 == disabled  (0mA -- +32mAV)
 130                 1 == enabled  (+4mA -- +20mAV)
 131   options[4]   Firmware program configuration
 132                 0 == program 1 (see manual table 5-4)
 133                 1 == program 2 (see manual table 5-4)
 134                 2 == program 3 (see manual table 5-4)
 135                 3 == program 4 (see manual table 5-4)
 136   options[5]   Analog output 0 range configuration
 137                 0 == voltage
 138                 1 == current
 139   options[6]   Analog output 1 range configuration
 140   ...
 141   options[12]   Analog output 7 range configuration
 142                 0 == voltage
 143                 1 == current
 144  */
 145
 146 static int dt2815_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 147 {
 148         struct dt2815_private *devpriv;
 149         struct comedi_subdevice *s;
 150         int i;
 151         const struct comedi_lrange *current_range_type, *voltage_range_type;
 152         int ret;
 153
 154         ret = comedi_request_region(dev, it->options[0], 0x2);
 155         if (ret)
 156                 return ret;
 157
 158         ret = comedi_alloc_subdevices(dev, 1);
 159         if (ret)
 160                 return ret;
 161
 162         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
 163         if (!devpriv)
 164                 return -ENOMEM;
 165
 166         s = &dev->subdevices[0];
 167         /* ao subdevice */
 168         s->type = COMEDI_SUBD_AO;
 169         s->subdev_flags = SDF_WRITABLE;
 170         s->maxdata = 0xfff;
 171         s->n_chan = 8;
 172         s->insn_write = dt2815_ao_insn;
 173         s->insn_read = dt2815_ao_insn_read;
 174         s->range_table_list = devpriv->range_type_list;
 175
 176         current_range_type = (it->options[3])
 177             ? &range_4_20mA : &range_0_32mA;
 178         voltage_range_type = (it->options[2])
 179             ? &range_bipolar5 : &range_unipolar5;
 180         for (i = 0; i < 8; i++) {
 181                 devpriv->range_type_list[i] = (it->options[5 + i])
 182                     ? current_range_type : voltage_range_type;
 183         }
 184
 185         /* Init the 2815 */
 186         outb(0x00, dev->iobase + DT2815_STATUS);
 187         for (i = 0; i < 100; i++) {
 188                 /* This is incredibly slow (approx 20 ms) */
 189                 unsigned int status;
 190
 191                 udelay(1000);
 192                 status = inb(dev->iobase + DT2815_STATUS);
 193                 if (status == 4) {
 194                         unsigned int program;
 195
 196                         program = (it->options[4] & 0x3) << 3 | 0x7;
 197                         outb(program, dev->iobase + DT2815_DATA);
 198                         dev_dbg(dev->class_dev, "program: 0x%x (@t=%d)\n",
 199                                 program, i);
 200                         break;
 201                 } else if (status != 0x00) {
 202                         dev_dbg(dev->class_dev,
 203                                 "unexpected status 0x%x (@t=%d)\n",
 204                                 status, i);
 205                         if (status & 0x60)
 206                                 outb(0x00, dev->iobase + DT2815_STATUS);
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212
 213 static struct comedi_driver dt2815_driver = {
 214         .driver_name    = "dt2815",
 215         .module         = THIS_MODULE,
 216         .attach         = dt2815_attach,
 217         .detach         = comedi_legacy_detach,
 218 };
 219 module_comedi_driver(dt2815_driver);
 220
 221 MODULE_AUTHOR("Comedi http://www.comedi.org");
 222 MODULE_DESCRIPTION("Comedi low-level driver");
 223 MODULE_LICENSE("GPL");