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138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* dac02.c
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* Comedi driver for DAC02 compatible boards
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* Copyright (C) 2014 H Hartley Sweeten <hsweeten@visionengravers.com>
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*
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* Based on the poc driver
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* Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net>
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* Copyright (C) 2001 David A. Schleef <ds@schleef.org>
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 1998 David A. Schleef <ds@schleef.org>
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*/
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/*
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* Driver: dac02
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* Description: Comedi driver for DAC02 compatible boards
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* Devices: [Keithley Metrabyte] DAC-02 (dac02)
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* Author: H Hartley Sweeten <hsweeten@visionengravers.com>
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* Updated: Tue, 11 Mar 2014 11:27:19 -0700
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* Status: unknown
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*
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* Configuration options:
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* [0] - I/O port base
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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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* The output range is selected by jumpering pins on the I/O connector.
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*
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* Range Chan # Jumper pins Output
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* ------------- ------ ------------- -----------------
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* 0 to 5V 0 21 to 22 24
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* 1 15 to 16 18
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* 0 to 10V 0 20 to 22 24
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* 1 14 to 16 18
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* +/-5V 0 21 to 22 23
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* 1 15 to 16 17
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* +/-10V 0 20 to 22 23
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* 1 14 to 16 17
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* 4 to 20mA 0 21 to 22 25
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* 1 15 to 16 19
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* AC reference 0 In on pin 22 24 (2-quadrant)
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* In on pin 22 23 (4-quadrant)
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* 1 In on pin 16 18 (2-quadrant)
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* In on pin 16 17 (4-quadrant)
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*/
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static const struct comedi_lrange das02_ao_ranges = {
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6, {
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UNI_RANGE(5),
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UNI_RANGE(10),
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BIP_RANGE(5),
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BIP_RANGE(10),
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RANGE_mA(4, 20),
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RANGE_ext(0, 1)
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}
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};
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/*
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* Register I/O map
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*/
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#define DAC02_AO_LSB(x) (0x00 + ((x) * 2))
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#define DAC02_AO_MSB(x) (0x01 + ((x) * 2))
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static int dac02_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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unsigned int chan = CR_CHAN(insn->chanspec);
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unsigned int range = CR_RANGE(insn->chanspec);
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unsigned int val;
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int i;
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for (i = 0; i < insn->n; i++) {
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val = data[i];
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s->readback[chan] = val;
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/*
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* Unipolar outputs are true binary encoding.
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* Bipolar outputs are complementary offset binary
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* (that is, 0 = +full scale, maxdata = -full scale).
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*/
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if (comedi_range_is_bipolar(s, range))
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val = s->maxdata - val;
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/*
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* DACs are double-buffered.
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* Write LSB then MSB to latch output.
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*/
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outb((val << 4) & 0xf0, dev->iobase + DAC02_AO_LSB(chan));
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outb((val >> 4) & 0xff, dev->iobase + DAC02_AO_MSB(chan));
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}
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return insn->n;
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}
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static int dac02_attach(struct comedi_device *dev, struct comedi_devconfig *it)
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{
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struct comedi_subdevice *s;
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int ret;
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ret = comedi_request_region(dev, it->options[0], 0x08);
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if (ret)
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return ret;
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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->n_chan = 2;
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s->maxdata = 0x0fff;
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s->range_table = &das02_ao_ranges;
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s->insn_write = dac02_ao_insn_write;
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return comedi_alloc_subdev_readback(s);
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}
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static struct comedi_driver dac02_driver = {
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.driver_name = "dac02",
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.module = THIS_MODULE,
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.attach = dac02_attach,
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.detach = comedi_legacy_detach,
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};
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module_comedi_driver(dac02_driver);
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MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
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MODULE_DESCRIPTION("Comedi driver for DAC02 compatible boards");
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MODULE_LICENSE("GPL");
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