amplc_pc263.c

  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(s->state & 0xff, dev->iobase + PC263_DO_0_7_REG);
 51		outb((s->state >> 8) & 0xff, 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, it->options[0], 0x2);
 65	if (ret)
 66		return ret;
 67
 68	ret = comedi_alloc_subdevices(dev, 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(dev->iobase + PC263_DO_0_7_REG) |
 83		   (inb(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");