1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * fl512.c
4 * Anders Gnistrup <ex18@kalman.iau.dtu.dk>
5 *
6 * COMEDI - Linux Control and Measurement Device Interface
7 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
8 */
9
10/*
11 * Driver: fl512
12 * Description: unknown
13 * Author: Anders Gnistrup <ex18@kalman.iau.dtu.dk>
14 * Devices: [unknown] FL512 (fl512)
15 * Status: unknown
16 *
17 * Digital I/O is not supported.
18 *
19 * Configuration options:
20 *   [0] - I/O port base address
21 */
22
23#include <linux/module.h>
24#include <linux/comedi/comedidev.h>
25#include <linux/delay.h>
26
27/*
28 * Register I/O map
29 */
30#define FL512_AI_LSB_REG		0x02
31#define FL512_AI_MSB_REG		0x03
32#define FL512_AI_MUX_REG		0x02
33#define FL512_AI_START_CONV_REG		0x03
34#define FL512_AO_DATA_REG(x)		(0x04 + ((x) * 2))
35#define FL512_AO_TRIG_REG(x)		(0x04 + ((x) * 2))
36
37static const struct comedi_lrange range_fl512 = {
38	4, {
39		BIP_RANGE(0.5),
40		BIP_RANGE(1),
41		BIP_RANGE(5),
42		BIP_RANGE(10),
43		UNI_RANGE(1),
44		UNI_RANGE(5),
45		UNI_RANGE(10)
46	}
47};
48
49static int fl512_ai_insn_read(struct comedi_device *dev,
50			      struct comedi_subdevice *s,
51			      struct comedi_insn *insn,
52			      unsigned int *data)
53{
54	unsigned int chan = CR_CHAN(insn->chanspec);
55	unsigned int val;
56	int i;
57
58	outb(chan, dev->iobase + FL512_AI_MUX_REG);
59
60	for (i = 0; i < insn->n; i++) {
61		outb(0, dev->iobase + FL512_AI_START_CONV_REG);
62
63		/* XXX should test "done" flag instead of delay */
64		usleep_range(30, 100);
65
66		val = inb(dev->iobase + FL512_AI_LSB_REG);
67		val |= (inb(dev->iobase + FL512_AI_MSB_REG) << 8);
68		val &= s->maxdata;
69
70		data[i] = val;
71	}
72
73	return insn->n;
74}
75
76static int fl512_ao_insn_write(struct comedi_device *dev,
77			       struct comedi_subdevice *s,
78			       struct comedi_insn *insn,
79			       unsigned int *data)
80{
81	unsigned int chan = CR_CHAN(insn->chanspec);
82	unsigned int val = s->readback[chan];
83	int i;
84
85	for (i = 0; i < insn->n; i++) {
86		val = data[i];
87
88		/* write LSB, MSB then trigger conversion */
89		outb(val & 0x0ff, dev->iobase + FL512_AO_DATA_REG(chan));
90		outb((val >> 8) & 0xf, dev->iobase + FL512_AO_DATA_REG(chan));
91		inb(dev->iobase + FL512_AO_TRIG_REG(chan));
92	}
93	s->readback[chan] = val;
94
95	return insn->n;
96}
97
98static int fl512_attach(struct comedi_device *dev, struct comedi_devconfig *it)
99{
100	struct comedi_subdevice *s;
101	int ret;
102
103	ret = comedi_request_region(dev, it->options[0], 0x10);
104	if (ret)
105		return ret;
106
107	ret = comedi_alloc_subdevices(dev, 2);
108	if (ret)
109		return ret;
110
111	/* Analog Input subdevice */
112	s = &dev->subdevices[0];
113	s->type		= COMEDI_SUBD_AI;
114	s->subdev_flags	= SDF_READABLE | SDF_GROUND;
115	s->n_chan	= 16;
116	s->maxdata	= 0x0fff;
117	s->range_table	= &range_fl512;
118	s->insn_read	= fl512_ai_insn_read;
119
120	/* Analog Output subdevice */
121	s = &dev->subdevices[1];
122	s->type		= COMEDI_SUBD_AO;
123	s->subdev_flags	= SDF_WRITABLE;
124	s->n_chan	= 2;
125	s->maxdata	= 0x0fff;
126	s->range_table	= &range_fl512;
127	s->insn_write	= fl512_ao_insn_write;
128
129	return comedi_alloc_subdev_readback(s);
130}
131
132static struct comedi_driver fl512_driver = {
133	.driver_name	= "fl512",
134	.module		= THIS_MODULE,
135	.attach		= fl512_attach,
136	.detach		= comedi_legacy_detach,
137};
138module_comedi_driver(fl512_driver);
139
140MODULE_AUTHOR("Comedi https://www.comedi.org");
141MODULE_DESCRIPTION("Comedi low-level driver");
142MODULE_LICENSE("GPL");
143