LXR linux/drivers/staging/comedi/drivers/dt2817.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * comedi/drivers/dt2817.c
   4 * Hardware driver for Data Translation DT2817
   5 *
   6 * COMEDI - Linux Control and Measurement Device Interface
   7 * Copyright (C) 1998 David A. Schleef <ds@schleef.org>
   8 */
   9/*
  10 * Driver: dt2817
  11 * Description: Data Translation DT2817
  12 * Author: ds
  13 * Status: complete
  14 * Devices: [Data Translation] DT2817 (dt2817)
  15 *
  16 * A very simple digital I/O card.  Four banks of 8 lines, each bank
  17 * is configurable for input or output.  One wonders why it takes a
  18 * 50 page manual to describe this thing.
  19 *
  20 * The driver (which, btw, is much less than 50 pages) has 1 subdevice
  21 * with 32 channels, configurable in groups of 8.
  22 *
  23 * Configuration options:
  24 * [0] - I/O port base base address
  25 */
  26
  27#include <linux/module.h>
  28#include "../comedidev.h"
  29
  30#define DT2817_CR 0
  31#define DT2817_DATA 1
  32
  33static int dt2817_dio_insn_config(struct comedi_device *dev,
  34                                  struct comedi_subdevice *s,
  35                                  struct comedi_insn *insn,
  36                                  unsigned int *data)
  37{
  38        unsigned int chan = CR_CHAN(insn->chanspec);
  39        unsigned int oe = 0;
  40        unsigned int mask;
  41        int ret;
  42
  43        if (chan < 8)
  44                mask = 0x000000ff;
  45        else if (chan < 16)
  46                mask = 0x0000ff00;
  47        else if (chan < 24)
  48                mask = 0x00ff0000;
  49        else
  50                mask = 0xff000000;
  51
  52        ret = comedi_dio_insn_config(dev, s, insn, data, mask);
  53        if (ret)
  54                return ret;
  55
  56        if (s->io_bits & 0x000000ff)
  57                oe |= 0x1;
  58        if (s->io_bits & 0x0000ff00)
  59                oe |= 0x2;
  60        if (s->io_bits & 0x00ff0000)
  61                oe |= 0x4;
  62        if (s->io_bits & 0xff000000)
  63                oe |= 0x8;
  64
  65        outb(oe, dev->iobase + DT2817_CR);
  66
  67        return insn->n;
  68}
  69
  70static int dt2817_dio_insn_bits(struct comedi_device *dev,
  71                                struct comedi_subdevice *s,
  72                                struct comedi_insn *insn,
  73                                unsigned int *data)
  74{
  75        unsigned long iobase = dev->iobase + DT2817_DATA;
  76        unsigned int mask;
  77        unsigned int val;
  78
  79        mask = comedi_dio_update_state(s, data);
  80        if (mask) {
  81                if (mask & 0x000000ff)
  82                        outb(s->state & 0xff, iobase + 0);
  83                if (mask & 0x0000ff00)
  84                        outb((s->state >> 8) & 0xff, iobase + 1);
  85                if (mask & 0x00ff0000)
  86                        outb((s->state >> 16) & 0xff, iobase + 2);
  87                if (mask & 0xff000000)
  88                        outb((s->state >> 24) & 0xff, iobase + 3);
  89        }
  90
  91        val = inb(iobase + 0);
  92        val |= (inb(iobase + 1) << 8);
  93        val |= (inb(iobase + 2) << 16);
  94        val |= (inb(iobase + 3) << 24);
  95
  96        data[1] = val;
  97
  98        return insn->n;
  99}
 100
 101static int dt2817_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 102{
 103        int ret;
 104        struct comedi_subdevice *s;
 105
 106        ret = comedi_request_region(dev, it->options[0], 0x5);
 107        if (ret)
 108                return ret;
 109
 110        ret = comedi_alloc_subdevices(dev, 1);
 111        if (ret)
 112                return ret;
 113
 114        s = &dev->subdevices[0];
 115
 116        s->n_chan = 32;
 117        s->type = COMEDI_SUBD_DIO;
 118        s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
 119        s->range_table = &range_digital;
 120        s->maxdata = 1;
 121        s->insn_bits = dt2817_dio_insn_bits;
 122        s->insn_config = dt2817_dio_insn_config;
 123
 124        s->state = 0;
 125        outb(0, dev->iobase + DT2817_CR);
 126
 127        return 0;
 128}
 129
 130static struct comedi_driver dt2817_driver = {
 131        .driver_name    = "dt2817",
 132        .module         = THIS_MODULE,
 133        .attach         = dt2817_attach,
 134        .detach         = comedi_legacy_detach,
 135};
 136module_comedi_driver(dt2817_driver);
 137
 138MODULE_AUTHOR("Comedi http://www.comedi.org");
 139MODULE_DESCRIPTION("Comedi low-level driver");
 140MODULE_LICENSE("GPL");
 141