LXR linux/drivers/comedi/drivers/amplc

   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 "../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");
 103