--- /dev/null
+/*
+ * dac02.c
+ * Comedi driver for DAC02 compatible boards
+ * Copyright (C) 2014 H Hartley Sweeten <hsweeten@visionengravers.com>
+ *
+ * Based on the poc driver
+ * Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net>
+ * Copyright (C) 2001 David A. Schleef <ds@schleef.org>
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ * Copyright (C) 1998 David A. Schleef <ds@schleef.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * Driver: dac02
+ * Description: Comedi driver for DAC02 compatible boards
+ * Devices: [Keithley Metrabyte] DAC-02 (dac02)
+ * Author: H Hartley Sweeten <hsweeten@visionengravers.com>
+ * Updated: Tue, 11 Mar 2014 11:27:19 -0700
+ * Status: unknown
+ *
+ * Configuration options:
+ * [0] - I/O port base
+ */
+
+#include <linux/module.h>
+
+#include "../comedidev.h"
+
+/*
+ * The output range is selected by jumpering pins on the I/O connector.
+ *
+ * Range Chan # Jumper pins Output
+ * ------------- ------ ------------- -----------------
+ * 0 to 5V 0 21 to 22 24
+ * 1 15 to 16 18
+ * 0 to 10V 0 20 to 22 24
+ * 1 14 to 16 18
+ * +/-5V 0 21 to 22 23
+ * 1 15 to 16 17
+ * +/-10V 0 20 to 22 23
+ * 1 14 to 16 17
+ * 4 to 20mA 0 21 to 22 25
+ * 1 15 to 16 19
+ * AC reference 0 In on pin 22 24 (2-quadrant)
+ * In on pin 22 23 (4-quadrant)
+ * 1 In on pin 16 18 (2-quadrant)
+ * In on pin 16 17 (4-quadrant)
+ */
+static const struct comedi_lrange das02_ao_ranges = {
+ 6, {
+ UNI_RANGE(5),
+ UNI_RANGE(10),
+ BIP_RANGE(5),
+ BIP_RANGE(10),
+ RANGE_mA(4, 20),
+ RANGE_ext(0, 1)
+ }
+};
+
+/*
+ * Register I/O map
+ */
+#define DAC02_AO_LSB(x) (0x00 + ((x) * 2))
+#define DAC02_AO_MSB(x) (0x01 + ((x) * 2))
+
+static int dac02_ao_insn_write(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
+{
+ unsigned int chan = CR_CHAN(insn->chanspec);
+ unsigned int range = CR_RANGE(insn->chanspec);
+ unsigned int val;
+ int i;
+
+ for (i = 0; i < insn->n; i++) {
+ val = data[i];
+
+ s->readback[chan] = val;
+
+ /*
+ * Unipolar outputs are true binary encoding.
+ * Bipolar outputs are complementary offset binary
+ * (that is, 0 = +full scale, maxdata = -full scale).
+ */
+ if (comedi_range_is_bipolar(s, range))
+ val = s->maxdata - val;
+
+ /*
+ * DACs are double-buffered.
+ * Write LSB then MSB to latch output.
+ */
+ outb((val << 4) & 0xf0, dev->iobase + DAC02_AO_LSB(chan));
+ outb((val >> 4) & 0xff, dev->iobase + DAC02_AO_MSB(chan));
+ }
+
+ return insn->n;
+}
+
+static int dac02_attach(struct comedi_device *dev, struct comedi_devconfig *it)
+{
+ struct comedi_subdevice *s;
+ int ret;
+
+ ret = comedi_request_region(dev, it->options[0], 0x08);
+ if (ret)
+ return ret;
+
+ ret = comedi_alloc_subdevices(dev, 1);
+ if (ret)
+ return ret;
+
+ /* Analog Output subdevice */
+ s = &dev->subdevices[0];
+ s->type = COMEDI_SUBD_AO;
+ s->subdev_flags = SDF_WRITABLE;
+ s->n_chan = 2;
+ s->maxdata = 0x0fff;
+ s->range_table = &das02_ao_ranges;
+ s->insn_write = dac02_ao_insn_write;
+
+ ret = comedi_alloc_subdev_readback(s);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static struct comedi_driver dac02_driver = {
+ .driver_name = "dac02",
+ .module = THIS_MODULE,
+ .attach = dac02_attach,
+ .detach = comedi_legacy_detach,
+};
+module_comedi_driver(dac02_driver);
+
+MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
+MODULE_DESCRIPTION("Comedi driver for DAC02 compatible boards");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff