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    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22  */
  23 /*
  24 Driver: dt2815
  25 Description: Data Translation DT2815
  26 Author: ds
  27 Status: mostly complete, untested
  28 Devices: [Data Translation] DT2815 (dt2815)
  29
  30 I'm not sure anyone has ever tested this board.  If you have information
  31 contrary, please update.
  32
  33 Configuration options:
  34   [0] - I/O port base base address
  35   [1] - IRQ (unused)
  36   [2] - Voltage unipolar/bipolar configuration
  37         0 == unipolar 5V  (0V -- +5V)
  38         1 == bipolar 5V  (-5V -- +5V)
  39   [3] - Current offset configuration
  40         0 == disabled  (0mA -- +32mAV)
  41         1 == enabled  (+4mA -- +20mAV)
  42   [4] - Firmware program configuration
  43         0 == program 1 (see manual table 5-4)
  44         1 == program 2 (see manual table 5-4)
  45         2 == program 3 (see manual table 5-4)
  46         3 == program 4 (see manual table 5-4)
  47   [5] - Analog output 0 range configuration
  48         0 == voltage
  49         1 == current
  50   [6] - Analog output 1 range configuration (same options)
  51   [7] - Analog output 2 range configuration (same options)
  52   [8] - Analog output 3 range configuration (same options)
  53   [9] - Analog output 4 range configuration (same options)
  54   [10] - Analog output 5 range configuration (same options)
  55   [11] - Analog output 6 range configuration (same options)
  56   [12] - Analog output 7 range configuration (same options)
  57 */
  58
  59 #include "../comedidev.h"
  60
  61 #include <linux/ioport.h>
  62 #include <linux/delay.h>
  63
  64 #define DT2815_SIZE 2
  65
  66 #define DT2815_DATA 0
  67 #define DT2815_STATUS 1
  68
  69 struct dt2815_private {
  70
  71         const struct comedi_lrange *range_type_list[8];
  72         unsigned int ao_readback[8];
  73 };
  74
  75 static int dt2815_wait_for_status(struct comedi_device *dev, int status)
  76 {
  77         int i;
  78
  79         for (i = 0; i < 100; i++) {
  80                 if (inb(dev->iobase + DT2815_STATUS) == status)
  81                         break;
  82         }
  83         return status;
  84 }
  85
  86 static int dt2815_ao_insn_read(struct comedi_device *dev,
  87                                struct comedi_subdevice *s,
  88                                struct comedi_insn *insn, unsigned int *data)
  89 {
  90         struct dt2815_private *devpriv = dev->private;
  91         int i;
  92         int chan = CR_CHAN(insn->chanspec);
  93
  94         for (i = 0; i < insn->n; i++)
  95                 data[i] = devpriv->ao_readback[chan];
  96
  97         return i;
  98 }
  99
 100 static int dt2815_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s,
 101                           struct comedi_insn *insn, unsigned int *data)
 102 {
 103         struct dt2815_private *devpriv = dev->private;
 104         int i;
 105         int chan = CR_CHAN(insn->chanspec);
 106         unsigned int status;
 107         unsigned int lo, hi;
 108
 109         for (i = 0; i < insn->n; i++) {
 110                 lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01;
 111                 hi = (data[i] & 0xff0) >> 4;
 112
 113                 status = dt2815_wait_for_status(dev, 0x00);
 114                 if (status != 0) {
 115                         printk(KERN_WARNING "dt2815: failed to write low byte "
 116                                "on %d reason %x\n", chan, status);
 117                         return -EBUSY;
 118                 }
 119
 120                 outb(lo, dev->iobase + DT2815_DATA);
 121
 122                 status = dt2815_wait_for_status(dev, 0x10);
 123                 if (status != 0x10) {
 124                         printk(KERN_WARNING "dt2815: failed to write high byte "
 125                                "on %d reason %x\n", chan, status);
 126                         return -EBUSY;
 127                 }
 128                 devpriv->ao_readback[chan] = data[i];
 129         }
 130         return i;
 131 }
 132
 133 /*
 134   options[0]   Board base address
 135   options[1]   IRQ (not applicable)
 136   options[2]   Voltage unipolar/bipolar configuration
 137                 0 == unipolar 5V  (0V -- +5V)
 138                 1 == bipolar 5V  (-5V -- +5V)
 139   options[3]   Current offset configuration
 140                 0 == disabled  (0mA -- +32mAV)
 141                 1 == enabled  (+4mA -- +20mAV)
 142   options[4]   Firmware program configuration
 143                 0 == program 1 (see manual table 5-4)
 144                 1 == program 2 (see manual table 5-4)
 145                 2 == program 3 (see manual table 5-4)
 146                 3 == program 4 (see manual table 5-4)
 147   options[5]   Analog output 0 range configuration
 148                 0 == voltage
 149                 1 == current
 150   options[6]   Analog output 1 range configuration
 151   ...
 152   options[12]   Analog output 7 range configuration
 153                 0 == voltage
 154                 1 == current
 155  */
 156
 157 static int dt2815_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 158 {
 159         struct dt2815_private *devpriv;
 160         struct comedi_subdevice *s;
 161         int i;
 162         const struct comedi_lrange *current_range_type, *voltage_range_type;
 163         int ret;
 164
 165         ret = comedi_request_region(dev, it->options[0], DT2815_SIZE);
 166         if (ret)
 167                 return ret;
 168
 169         ret = comedi_alloc_subdevices(dev, 1);
 170         if (ret)
 171                 return ret;
 172
 173         devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
 174         if (!devpriv)
 175                 return -ENOMEM;
 176         dev->private = devpriv;
 177
 178         s = &dev->subdevices[0];
 179         /* ao subdevice */
 180         s->type = COMEDI_SUBD_AO;
 181         s->subdev_flags = SDF_WRITABLE;
 182         s->maxdata = 0xfff;
 183         s->n_chan = 8;
 184         s->insn_write = dt2815_ao_insn;
 185         s->insn_read = dt2815_ao_insn_read;
 186         s->range_table_list = devpriv->range_type_list;
 187
 188         current_range_type = (it->options[3])
 189             ? &range_4_20mA : &range_0_32mA;
 190         voltage_range_type = (it->options[2])
 191             ? &range_bipolar5 : &range_unipolar5;
 192         for (i = 0; i < 8; i++) {
 193                 devpriv->range_type_list[i] = (it->options[5 + i])
 194                     ? current_range_type : voltage_range_type;
 195         }
 196
 197         /* Init the 2815 */
 198         outb(0x00, dev->iobase + DT2815_STATUS);
 199         for (i = 0; i < 100; i++) {
 200                 /* This is incredibly slow (approx 20 ms) */
 201                 unsigned int status;
 202
 203                 udelay(1000);
 204                 status = inb(dev->iobase + DT2815_STATUS);
 205                 if (status == 4) {
 206                         unsigned int program;
 207                         program = (it->options[4] & 0x3) << 3 | 0x7;
 208                         outb(program, dev->iobase + DT2815_DATA);
 209                         printk(KERN_INFO ", program: 0x%x (@t=%d)\n",
 210                                program, i);
 211                         break;
 212                 } else if (status != 0x00) {
 213                         printk(KERN_WARNING "dt2815: unexpected status 0x%x "
 214                                "(@t=%d)\n", status, i);
 215                         if (status & 0x60)
 216                                 outb(0x00, dev->iobase + DT2815_STATUS);
 217                 }
 218         }
 219
 220         return 0;
 221 }
 222
 223 static struct comedi_driver dt2815_driver = {
 224         .driver_name    = "dt2815",
 225         .module         = THIS_MODULE,
 226         .attach         = dt2815_attach,
 227         .detach         = comedi_legacy_detach,
 228 };
 229 module_comedi_driver(dt2815_driver);
 230
 231 MODULE_AUTHOR("Comedi http://www.comedi.org");
 232 MODULE_DESCRIPTION("Comedi low-level driver");
 233 MODULE_LICENSE("GPL");