// SPDX-License-Identifier: GPL-2.0+
/*
* dac02.c
* Comedi driver for DAC02 compatible boards
* Copyright (C) 2014 H Hartley Sweeten <[email protected]>
*
* Based on the poc driver
* Copyright (C) 2000 Frank Mori Hess <[email protected]>
* Copyright (C) 2001 David A. Schleef <[email protected]>
*
* COMEDI - Linux Control and Measurement Device Interface
* Copyright (C) 1998 David A. Schleef <[email protected]>
*/
/*
* Driver: dac02
* Description: Comedi driver for DAC02 compatible boards
* Devices: [Keithley Metrabyte] DAC-02 (dac02)
* Author: H Hartley Sweeten <[email protected]>
* Updated: Tue, 11 Mar 2014 11:27:19 -0700
* Status: unknown
*
* Configuration options:
* [0] - I/O port base
*/
#include <linux/module.h>
#include <linux/comedi/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;
return comedi_alloc_subdev_readback(s);
}
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 <[email protected]>");
MODULE_DESCRIPTION("Comedi driver for DAC02 compatible boards");
MODULE_LICENSE("GPL");
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