1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * rti802.c
4 * Comedi driver for Analog Devices RTI-802 board
5 *
6 * COMEDI - Linux Control and Measurement Device Interface
7 * Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
8 */
9
10/*
11 * Driver: rti802
12 * Description: Analog Devices RTI-802
13 * Author: Anders Blomdell <anders.blomdell@control.lth.se>
14 * Devices: [Analog Devices] RTI-802 (rti802)
15 * Status: works
16 *
17 * Configuration Options:
18 *   [0] - i/o base
19 *   [1] - unused
20 *   [2,4,6,8,10,12,14,16] - dac#[0-7]  0=two's comp, 1=straight
21 *   [3,5,7,9,11,13,15,17] - dac#[0-7]  0=bipolar, 1=unipolar
22 */
23
24#include <linux/module.h>
25#include <linux/comedi/comedidev.h>
26
27/*
28 * Register I/O map
29 */
30#define RTI802_SELECT		0x00
31#define RTI802_DATALOW		0x01
32#define RTI802_DATAHIGH		0x02
33
34struct rti802_private {
35	enum {
36		dac_2comp, dac_straight
37	} dac_coding[8];
38	const struct comedi_lrange *range_type_list[8];
39};
40
41static int rti802_ao_insn_write(struct comedi_device *dev,
42				struct comedi_subdevice *s,
43				struct comedi_insn *insn,
44				unsigned int *data)
45{
46	struct rti802_private *devpriv = dev->private;
47	unsigned int chan = CR_CHAN(insn->chanspec);
48	int i;
49
50	outb(chan, dev->iobase + RTI802_SELECT);
51
52	for (i = 0; i < insn->n; i++) {
53		unsigned int val = data[i];
54
55		s->readback[chan] = val;
56
57		/* munge offset binary to two's complement if needed */
58		if (devpriv->dac_coding[chan] == dac_2comp)
59			val = comedi_offset_munge(s, val);
60
61		outb(val & 0xff, dev->iobase + RTI802_DATALOW);
62		outb((val >> 8) & 0xff, dev->iobase + RTI802_DATAHIGH);
63	}
64
65	return insn->n;
66}
67
68static int rti802_attach(struct comedi_device *dev, struct comedi_devconfig *it)
69{
70	struct rti802_private *devpriv;
71	struct comedi_subdevice *s;
72	int i;
73	int ret;
74
75	ret = comedi_request_region(dev, it->options[0], 0x04);
76	if (ret)
77		return ret;
78
79	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
80	if (!devpriv)
81		return -ENOMEM;
82
83	ret = comedi_alloc_subdevices(dev, 1);
84	if (ret)
85		return ret;
86
87	/* Analog Output subdevice */
88	s = &dev->subdevices[0];
89	s->type		= COMEDI_SUBD_AO;
90	s->subdev_flags	= SDF_WRITABLE;
91	s->maxdata	= 0xfff;
92	s->n_chan	= 8;
93	s->insn_write	= rti802_ao_insn_write;
94
95	ret = comedi_alloc_subdev_readback(s);
96	if (ret)
97		return ret;
98
99	s->range_table_list = devpriv->range_type_list;
100	for (i = 0; i < 8; i++) {
101		devpriv->dac_coding[i] = (it->options[3 + 2 * i])
102			? (dac_straight) : (dac_2comp);
103		devpriv->range_type_list[i] = (it->options[2 + 2 * i])
104			? &range_unipolar10 : &range_bipolar10;
105	}
106
107	return 0;
108}
109
110static struct comedi_driver rti802_driver = {
111	.driver_name	= "rti802",
112	.module		= THIS_MODULE,
113	.attach		= rti802_attach,
114	.detach		= comedi_legacy_detach,
115};
116module_comedi_driver(rti802_driver);
117
118MODULE_AUTHOR("Comedi https://www.comedi.org");
119MODULE_DESCRIPTION("Comedi driver for Analog Devices RTI-802 board");
120MODULE_LICENSE("GPL");
121