// SPDX-License-Identifier: GPL-2.0+
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/*
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* rti802.c
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* Comedi driver for Analog Devices RTI-802 board
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
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*/
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/*
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* Driver: rti802
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* Description: Analog Devices RTI-802
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* Author: Anders Blomdell <anders.blomdell@control.lth.se>
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* Devices: [Analog Devices] RTI-802 (rti802)
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* Status: works
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*
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* Configuration Options:
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* [0] - i/o base
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* [1] - unused
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* [2,4,6,8,10,12,14,16] - dac#[0-7] 0=two's comp, 1=straight
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* [3,5,7,9,11,13,15,17] - dac#[0-7] 0=bipolar, 1=unipolar
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*/
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#include <linux/module.h>
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#include "../comedidev.h"
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/*
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* Register I/O map
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*/
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#define RTI802_SELECT 0x00
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#define RTI802_DATALOW 0x01
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#define RTI802_DATAHIGH 0x02
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struct rti802_private {
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enum {
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dac_2comp, dac_straight
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} dac_coding[8];
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const struct comedi_lrange *range_type_list[8];
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};
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static int rti802_ao_insn_write(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_insn *insn,
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unsigned int *data)
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{
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struct rti802_private *devpriv = dev->private;
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unsigned int chan = CR_CHAN(insn->chanspec);
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int i;
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outb(chan, dev->iobase + RTI802_SELECT);
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for (i = 0; i < insn->n; i++) {
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unsigned int val = data[i];
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s->readback[chan] = val;
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/* munge offset binary to two's complement if needed */
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if (devpriv->dac_coding[chan] == dac_2comp)
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val = comedi_offset_munge(s, val);
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outb(val & 0xff, dev->iobase + RTI802_DATALOW);
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outb((val >> 8) & 0xff, dev->iobase + RTI802_DATAHIGH);
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}
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return insn->n;
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}
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static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
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{
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struct rti802_private *devpriv;
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struct comedi_subdevice *s;
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int i;
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int ret;
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ret = comedi_request_region(dev, it->options[0], 0x04);
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if (ret)
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return ret;
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devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
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if (!devpriv)
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return -ENOMEM;
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ret = comedi_alloc_subdevices(dev, 1);
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if (ret)
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return ret;
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/* Analog Output subdevice */
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s = &dev->subdevices[0];
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s->type = COMEDI_SUBD_AO;
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s->subdev_flags = SDF_WRITABLE;
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s->maxdata = 0xfff;
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s->n_chan = 8;
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s->insn_write = rti802_ao_insn_write;
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ret = comedi_alloc_subdev_readback(s);
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if (ret)
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return ret;
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s->range_table_list = devpriv->range_type_list;
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for (i = 0; i < 8; i++) {
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devpriv->dac_coding[i] = (it->options[3 + 2 * i])
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? (dac_straight) : (dac_2comp);
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devpriv->range_type_list[i] = (it->options[2 + 2 * i])
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? &range_unipolar10 : &range_bipolar10;
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}
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return 0;
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}
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static struct comedi_driver rti802_driver = {
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.driver_name = "rti802",
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.module = THIS_MODULE,
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.attach = rti802_attach,
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.detach = comedi_legacy_detach,
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};
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module_comedi_driver(rti802_driver);
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MODULE_AUTHOR("Comedi https://www.comedi.org");
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MODULE_DESCRIPTION("Comedi driver for Analog Devices RTI-802 board");
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MODULE_LICENSE("GPL");
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