linux/drivers/staging/comedi/drivers/dt2815.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * comedi/drivers/dt2815.c
   4 * Hardware driver for Data Translation DT2815
   5 *
   6 * COMEDI - Linux Control and Measurement Device Interface
   7 * Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
   8 */
   9/*
  10 * Driver: dt2815
  11 * Description: Data Translation DT2815
  12 * Author: ds
  13 * Status: mostly complete, untested
  14 * Devices: [Data Translation] DT2815 (dt2815)
  15 *
  16 * I'm not sure anyone has ever tested this board.  If you have information
  17 * contrary, please update.
  18 *
  19 * Configuration options:
  20 * [0] - I/O port base base address
  21 * [1] - IRQ (unused)
  22 * [2] - Voltage unipolar/bipolar configuration
  23 *      0 == unipolar 5V  (0V -- +5V)
  24 *      1 == bipolar 5V  (-5V -- +5V)
  25 * [3] - Current offset configuration
  26 *      0 == disabled  (0mA -- +32mAV)
  27 *      1 == enabled  (+4mA -- +20mAV)
  28 * [4] - Firmware program configuration
  29 *      0 == program 1 (see manual table 5-4)
  30 *      1 == program 2 (see manual table 5-4)
  31 *      2 == program 3 (see manual table 5-4)
  32 *      3 == program 4 (see manual table 5-4)
  33 * [5] - Analog output 0 range configuration
  34 *      0 == voltage
  35 *      1 == current
  36 * [6] - Analog output 1 range configuration (same options)
  37 * [7] - Analog output 2 range configuration (same options)
  38 * [8] - Analog output 3 range configuration (same options)
  39 * [9] - Analog output 4 range configuration (same options)
  40 * [10] - Analog output 5 range configuration (same options)
  41 * [11] - Analog output 6 range configuration (same options)
  42 * [12] - Analog output 7 range configuration (same options)
  43 */
  44
  45#include <linux/module.h>
  46#include "../comedidev.h"
  47
  48#include <linux/delay.h>
  49
  50#define DT2815_DATA 0
  51#define DT2815_STATUS 1
  52
  53struct dt2815_private {
  54        const struct comedi_lrange *range_type_list[8];
  55        unsigned int ao_readback[8];
  56};
  57
  58static int dt2815_ao_status(struct comedi_device *dev,
  59                            struct comedi_subdevice *s,
  60                            struct comedi_insn *insn,
  61                            unsigned long context)
  62{
  63        unsigned int status;
  64
  65        status = inb(dev->iobase + DT2815_STATUS);
  66        if (status == context)
  67                return 0;
  68        return -EBUSY;
  69}
  70
  71static int dt2815_ao_insn_read(struct comedi_device *dev,
  72                               struct comedi_subdevice *s,
  73                               struct comedi_insn *insn, unsigned int *data)
  74{
  75        struct dt2815_private *devpriv = dev->private;
  76        int i;
  77        int chan = CR_CHAN(insn->chanspec);
  78
  79        for (i = 0; i < insn->n; i++)
  80                data[i] = devpriv->ao_readback[chan];
  81
  82        return i;
  83}
  84
  85static int dt2815_ao_insn(struct comedi_device *dev, struct comedi_subdevice *s,
  86                          struct comedi_insn *insn, unsigned int *data)
  87{
  88        struct dt2815_private *devpriv = dev->private;
  89        int i;
  90        int chan = CR_CHAN(insn->chanspec);
  91        unsigned int lo, hi;
  92        int ret;
  93
  94        for (i = 0; i < insn->n; i++) {
  95                /* FIXME: lo bit 0 chooses voltage output or current output */
  96                lo = ((data[i] & 0x0f) << 4) | (chan << 1) | 0x01;
  97                hi = (data[i] & 0xff0) >> 4;
  98
  99                ret = comedi_timeout(dev, s, insn, dt2815_ao_status, 0x00);
 100                if (ret)
 101                        return ret;
 102
 103                outb(lo, dev->iobase + DT2815_DATA);
 104
 105                ret = comedi_timeout(dev, s, insn, dt2815_ao_status, 0x10);
 106                if (ret)
 107                        return ret;
 108
 109                outb(hi, dev->iobase + DT2815_DATA);
 110
 111                devpriv->ao_readback[chan] = data[i];
 112        }
 113        return i;
 114}
 115
 116/*
 117 * options[0]   Board base address
 118 * options[1]   IRQ (not applicable)
 119 * options[2]   Voltage unipolar/bipolar configuration
 120 *              0 == unipolar 5V  (0V -- +5V)
 121 *              1 == bipolar 5V  (-5V -- +5V)
 122 * options[3]   Current offset configuration
 123 *              0 == disabled  (0mA -- +32mAV)
 124 *              1 == enabled  (+4mA -- +20mAV)
 125 * options[4]   Firmware program configuration
 126 *              0 == program 1 (see manual table 5-4)
 127 *              1 == program 2 (see manual table 5-4)
 128 *              2 == program 3 (see manual table 5-4)
 129 *              3 == program 4 (see manual table 5-4)
 130 * options[5]   Analog output 0 range configuration
 131 *              0 == voltage
 132 *              1 == current
 133 * options[6]   Analog output 1 range configuration
 134 * ...
 135 * options[12]   Analog output 7 range configuration
 136 *              0 == voltage
 137 *              1 == current
 138 */
 139
 140static int dt2815_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 141{
 142        struct dt2815_private *devpriv;
 143        struct comedi_subdevice *s;
 144        int i;
 145        const struct comedi_lrange *current_range_type, *voltage_range_type;
 146        int ret;
 147
 148        ret = comedi_request_region(dev, it->options[0], 0x2);
 149        if (ret)
 150                return ret;
 151
 152        ret = comedi_alloc_subdevices(dev, 1);
 153        if (ret)
 154                return ret;
 155
 156        devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
 157        if (!devpriv)
 158                return -ENOMEM;
 159
 160        s = &dev->subdevices[0];
 161        /* ao subdevice */
 162        s->type = COMEDI_SUBD_AO;
 163        s->subdev_flags = SDF_WRITABLE;
 164        s->maxdata = 0xfff;
 165        s->n_chan = 8;
 166        s->insn_write = dt2815_ao_insn;
 167        s->insn_read = dt2815_ao_insn_read;
 168        s->range_table_list = devpriv->range_type_list;
 169
 170        current_range_type = (it->options[3])
 171            ? &range_4_20mA : &range_0_32mA;
 172        voltage_range_type = (it->options[2])
 173            ? &range_bipolar5 : &range_unipolar5;
 174        for (i = 0; i < 8; i++) {
 175                devpriv->range_type_list[i] = (it->options[5 + i])
 176                    ? current_range_type : voltage_range_type;
 177        }
 178
 179        /* Init the 2815 */
 180        outb(0x00, dev->iobase + DT2815_STATUS);
 181        for (i = 0; i < 100; i++) {
 182                /* This is incredibly slow (approx 20 ms) */
 183                unsigned int status;
 184
 185                usleep_range(1000, 3000);
 186                status = inb(dev->iobase + DT2815_STATUS);
 187                if (status == 4) {
 188                        unsigned int program;
 189
 190                        program = (it->options[4] & 0x3) << 3 | 0x7;
 191                        outb(program, dev->iobase + DT2815_DATA);
 192                        dev_dbg(dev->class_dev, "program: 0x%x (@t=%d)\n",
 193                                program, i);
 194                        break;
 195                } else if (status != 0x00) {
 196                        dev_dbg(dev->class_dev,
 197                                "unexpected status 0x%x (@t=%d)\n",
 198                                status, i);
 199                        if (status & 0x60)
 200                                outb(0x00, dev->iobase + DT2815_STATUS);
 201                }
 202        }
 203
 204        return 0;
 205}
 206
 207static struct comedi_driver dt2815_driver = {
 208        .driver_name    = "dt2815",
 209        .module         = THIS_MODULE,
 210        .attach         = dt2815_attach,
 211        .detach         = comedi_legacy_detach,
 212};
 213module_comedi_driver(dt2815_driver);
 214
 215MODULE_AUTHOR("Comedi http://www.comedi.org");
 216MODULE_DESCRIPTION("Comedi low-level driver");
 217MODULE_LICENSE("GPL");
 218