LXR linux/drivers/staging/comedi/drivers/fl512.c

   1/*
   2 * fl512.c
   3 * Anders Gnistrup <ex18@kalman.iau.dtu.dk>
   4 *
   5 * COMEDI - Linux Control and Measurement Device Interface
   6 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
   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/*
  20 * Driver: fl512
  21 * Description: unknown
  22 * Author: Anders Gnistrup <ex18@kalman.iau.dtu.dk>
  23 * Devices: [unknown] FL512 (fl512)
  24 * Status: unknown
  25 *
  26 * Digital I/O is not supported.
  27 *
  28 * Configuration options:
  29 *   [0] - I/O port base address
  30 */
  31
  32#include <linux/module.h>
  33#include "../comedidev.h"
  34
  35#include <linux/delay.h>
  36
  37/*
  38 * Register I/O map
  39 */
  40#define FL512_AI_LSB_REG                0x02
  41#define FL512_AI_MSB_REG                0x03
  42#define FL512_AI_MUX_REG                0x02
  43#define FL512_AI_START_CONV_REG         0x03
  44#define FL512_AO_DATA_REG(x)            (0x04 + ((x) * 2))
  45#define FL512_AO_TRIG_REG(x)            (0x04 + ((x) * 2))
  46
  47static const struct comedi_lrange range_fl512 = {
  48        4, {
  49                BIP_RANGE(0.5),
  50                BIP_RANGE(1),
  51                BIP_RANGE(5),
  52                BIP_RANGE(10),
  53                UNI_RANGE(1),
  54                UNI_RANGE(5),
  55                UNI_RANGE(10)
  56        }
  57};
  58
  59static int fl512_ai_insn_read(struct comedi_device *dev,
  60                              struct comedi_subdevice *s,
  61                              struct comedi_insn *insn,
  62                              unsigned int *data)
  63{
  64        unsigned int chan = CR_CHAN(insn->chanspec);
  65        unsigned int val;
  66        int i;
  67
  68        outb(chan, dev->iobase + FL512_AI_MUX_REG);
  69
  70        for (i = 0; i < insn->n; i++) {
  71                outb(0, dev->iobase + FL512_AI_START_CONV_REG);
  72
  73                /* XXX should test "done" flag instead of delay */
  74                usleep_range(30, 100);
  75
  76                val = inb(dev->iobase + FL512_AI_LSB_REG);
  77                val |= (inb(dev->iobase + FL512_AI_MSB_REG) << 8);
  78                val &= s->maxdata;
  79
  80                data[i] = val;
  81        }
  82
  83        return insn->n;
  84}
  85
  86static int fl512_ao_insn_write(struct comedi_device *dev,
  87                               struct comedi_subdevice *s,
  88                               struct comedi_insn *insn,
  89                               unsigned int *data)
  90{
  91        unsigned int chan = CR_CHAN(insn->chanspec);
  92        unsigned int val = s->readback[chan];
  93        int i;
  94
  95        for (i = 0; i < insn->n; i++) {
  96                val = data[i];
  97
  98                /* write LSB, MSB then trigger conversion */
  99                outb(val & 0x0ff, dev->iobase + FL512_AO_DATA_REG(chan));
 100                outb((val >> 8) & 0xf, dev->iobase + FL512_AO_DATA_REG(chan));
 101                inb(dev->iobase + FL512_AO_TRIG_REG(chan));
 102        }
 103        s->readback[chan] = val;
 104
 105        return insn->n;
 106}
 107
 108static int fl512_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 109{
 110        struct comedi_subdevice *s;
 111        int ret;
 112
 113        ret = comedi_request_region(dev, it->options[0], 0x10);
 114        if (ret)
 115                return ret;
 116
 117        ret = comedi_alloc_subdevices(dev, 2);
 118        if (ret)
 119                return ret;
 120
 121        /* Analog Input subdevice */
 122        s = &dev->subdevices[0];
 123        s->type         = COMEDI_SUBD_AI;
 124        s->subdev_flags = SDF_READABLE | SDF_GROUND;
 125        s->n_chan       = 16;
 126        s->maxdata      = 0x0fff;
 127        s->range_table  = &range_fl512;
 128        s->insn_read    = fl512_ai_insn_read;
 129
 130        /* Analog Output subdevice */
 131        s = &dev->subdevices[1];
 132        s->type         = COMEDI_SUBD_AO;
 133        s->subdev_flags = SDF_WRITABLE;
 134        s->n_chan       = 2;
 135        s->maxdata      = 0x0fff;
 136        s->range_table  = &range_fl512;
 137        s->insn_write   = fl512_ao_insn_write;
 138
 139        return comedi_alloc_subdev_readback(s);
 140}
 141
 142static struct comedi_driver fl512_driver = {
 143        .driver_name    = "fl512",
 144        .module         = THIS_MODULE,
 145        .attach         = fl512_attach,
 146        .detach         = comedi_legacy_detach,
 147};
 148module_comedi_driver(fl512_driver);
 149
 150MODULE_AUTHOR("Comedi http://www.comedi.org");
 151MODULE_DESCRIPTION("Comedi low-level driver");
 152MODULE_LICENSE("GPL");
 153