// SPDX-License-Identifier: GPL-2.0+
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/*
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* comedi/drivers/amplc_pc236.c
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* Driver for Amplicon PC36AT DIO boards.
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*
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* Copyright (C) 2002 MEV Ltd. <https://www.mev.co.uk/>
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 2000 David A. Schleef <ds@schleef.org>
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*/
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/*
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* Driver: amplc_pc236
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* Description: Amplicon PC36AT
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* Author: Ian Abbott <abbotti@mev.co.uk>
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* Devices: [Amplicon] PC36AT (pc36at)
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* Updated: Fri, 25 Jul 2014 15:32:40 +0000
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* Status: works
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*
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* Configuration options - PC36AT:
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* [0] - I/O port base address
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* [1] - IRQ (optional)
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*
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* The PC36AT board has a single 8255 appearing as subdevice 0.
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*
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* Subdevice 1 pretends to be a digital input device, but it always returns
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* 0 when read. However, if you run a command with scan_begin_src=TRIG_EXT,
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* a rising edge on port C bit 3 acts as an external trigger, which can be
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* used to wake up tasks. This is like the comedi_parport device, but the
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* only way to physically disable the interrupt on the PC36AT is to remove
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* the IRQ jumper. If no interrupt is connected, then subdevice 1 is
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* unused.
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*/
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#include <linux/module.h>
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#include "../comedidev.h"
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#include "amplc_pc236.h"
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static int pc236_attach(struct comedi_device *dev, struct comedi_devconfig *it)
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{
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struct pc236_private *devpriv;
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int ret;
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devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
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if (!devpriv)
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return -ENOMEM;
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ret = comedi_request_region(dev, it->options[0], 0x4);
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if (ret)
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return ret;
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return amplc_pc236_common_attach(dev, dev->iobase, it->options[1], 0);
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}
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static const struct pc236_board pc236_boards[] = {
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{
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.name = "pc36at",
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},
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};
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static struct comedi_driver amplc_pc236_driver = {
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.driver_name = "amplc_pc236",
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.module = THIS_MODULE,
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.attach = pc236_attach,
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.detach = comedi_legacy_detach,
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.board_name = &pc236_boards[0].name,
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.offset = sizeof(struct pc236_board),
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.num_names = ARRAY_SIZE(pc236_boards),
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};
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module_comedi_driver(amplc_pc236_driver);
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MODULE_AUTHOR("Comedi https://www.comedi.org");
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MODULE_DESCRIPTION("Comedi driver for Amplicon PC36AT DIO boards");
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MODULE_LICENSE("GPL");
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