1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Driver for Amplicon PC263 relay board.
4 *
5 * Copyright (C) 2002 MEV Ltd. <https://www.mev.co.uk/>
6 *
7 * COMEDI - Linux Control and Measurement Device Interface
8 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
9 */
10
11/*
12 * Driver: amplc_pc263
13 * Description: Amplicon PC263
14 * Author: Ian Abbott <abbotti@mev.co.uk>
15 * Devices: [Amplicon] PC263 (pc263)
16 * Updated: Fri, 12 Apr 2013 15:19:36 +0100
17 * Status: works
18 *
19 * Configuration options:
20 * [0] - I/O port base address
21 *
22 * The board appears as one subdevice, with 16 digital outputs, each
23 * connected to a reed-relay. Relay contacts are closed when output is 1.
24 * The state of the outputs can be read.
25 */
26
27#include <linux/module.h>
28#include <linux/comedi/comedidev.h>
29
30/* PC263 registers */
31#define PC263_DO_0_7_REG 0x00
32#define PC263_DO_8_15_REG 0x01
33
34struct pc263_board {
35 const char *name;
36};
37
38static const struct pc263_board pc263_boards[] = {
39 {
40 .name = "pc263",
41 },
42};
43
44static int pc263_do_insn_bits(struct comedi_device *dev,
45 struct comedi_subdevice *s,
46 struct comedi_insn *insn,
47 unsigned int *data)
48{
49 if (comedi_dio_update_state(s, data)) {
50 outb(value: s->state & 0xff, port: dev->iobase + PC263_DO_0_7_REG);
51 outb(value: (s->state >> 8) & 0xff, port: dev->iobase + PC263_DO_8_15_REG);
52 }
53
54 data[1] = s->state;
55
56 return insn->n;
57}
58
59static int pc263_attach(struct comedi_device *dev, struct comedi_devconfig *it)
60{
61 struct comedi_subdevice *s;
62 int ret;
63
64 ret = comedi_request_region(dev, start: it->options[0], len: 0x2);
65 if (ret)
66 return ret;
67
68 ret = comedi_alloc_subdevices(dev, num_subdevices: 1);
69 if (ret)
70 return ret;
71
72 /* Digital Output subdevice */
73 s = &dev->subdevices[0];
74 s->type = COMEDI_SUBD_DO;
75 s->subdev_flags = SDF_WRITABLE;
76 s->n_chan = 16;
77 s->maxdata = 1;
78 s->range_table = &range_digital;
79 s->insn_bits = pc263_do_insn_bits;
80
81 /* read initial relay state */
82 s->state = inb(port: dev->iobase + PC263_DO_0_7_REG) |
83 (inb(port: dev->iobase + PC263_DO_8_15_REG) << 8);
84
85 return 0;
86}
87
88static struct comedi_driver amplc_pc263_driver = {
89 .driver_name = "amplc_pc263",
90 .module = THIS_MODULE,
91 .attach = pc263_attach,
92 .detach = comedi_legacy_detach,
93 .board_name = &pc263_boards[0].name,
94 .offset = sizeof(struct pc263_board),
95 .num_names = ARRAY_SIZE(pc263_boards),
96};
97
98module_comedi_driver(amplc_pc263_driver);
99
100MODULE_AUTHOR("Comedi https://www.comedi.org");
101MODULE_DESCRIPTION("Comedi driver for Amplicon PC263 relay board");
102MODULE_LICENSE("GPL");
103

source code of linux/drivers/comedi/drivers/amplc_pc263.c