LXR linux/drivers/comedi/drivers/amplc

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * comedi/drivers/amplc_pc236.c
   4 * Driver for Amplicon PC36AT DIO boards.
   5 *
   6 * Copyright (C) 2002 MEV Ltd. <https://www.mev.co.uk/>
   7 *
   8 * COMEDI - Linux Control and Measurement Device Interface
   9 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
  10 */
  11/*
  12 * Driver: amplc_pc236
  13 * Description: Amplicon PC36AT
  14 * Author: Ian Abbott <abbotti@mev.co.uk>
  15 * Devices: [Amplicon] PC36AT (pc36at)
  16 * Updated: Fri, 25 Jul 2014 15:32:40 +0000
  17 * Status: works
  18 *
  19 * Configuration options - PC36AT:
  20 *   [0] - I/O port base address
  21 *   [1] - IRQ (optional)
  22 *
  23 * The PC36AT board has a single 8255 appearing as subdevice 0.
  24 *
  25 * Subdevice 1 pretends to be a digital input device, but it always returns
  26 * 0 when read. However, if you run a command with scan_begin_src=TRIG_EXT,
  27 * a rising edge on port C bit 3 acts as an external trigger, which can be
  28 * used to wake up tasks.  This is like the comedi_parport device, but the
  29 * only way to physically disable the interrupt on the PC36AT is to remove
  30 * the IRQ jumper.  If no interrupt is connected, then subdevice 1 is
  31 * unused.
  32 */
  33
  34#include <linux/module.h>
  35
  36#include "../comedidev.h"
  37
  38#include "amplc_pc236.h"
  39
  40static int pc236_attach(struct comedi_device *dev, struct comedi_devconfig *it)
  41{
  42        struct pc236_private *devpriv;
  43        int ret;
  44
  45        devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
  46        if (!devpriv)
  47                return -ENOMEM;
  48
  49        ret = comedi_request_region(dev, it->options[0], 0x4);
  50        if (ret)
  51                return ret;
  52
  53        return amplc_pc236_common_attach(dev, dev->iobase, it->options[1], 0);
  54}
  55
  56static const struct pc236_board pc236_boards[] = {
  57        {
  58                .name = "pc36at",
  59        },
  60};
  61
  62static struct comedi_driver amplc_pc236_driver = {
  63        .driver_name = "amplc_pc236",
  64        .module = THIS_MODULE,
  65        .attach = pc236_attach,
  66        .detach = comedi_legacy_detach,
  67        .board_name = &pc236_boards[0].name,
  68        .offset = sizeof(struct pc236_board),
  69        .num_names = ARRAY_SIZE(pc236_boards),
  70};
  71
  72module_comedi_driver(amplc_pc236_driver);
  73
  74MODULE_AUTHOR("Comedi https://www.comedi.org");
  75MODULE_DESCRIPTION("Comedi driver for Amplicon PC36AT DIO boards");
  76MODULE_LICENSE("GPL");
  77