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Linux/drivers/staging/comedi/drivers/amplc_pc236.c

  1 /*
  2  * comedi/drivers/amplc_pc236.c
  3  * Driver for Amplicon PC36AT DIO boards.
  4  *
  5  * Copyright (C) 2002 MEV Ltd. <http://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  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or
 13  * (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  * GNU General Public License for more details.
 19  */
 20 /*
 21  * Driver: amplc_pc236
 22  * Description: Amplicon PC36AT
 23  * Author: Ian Abbott <abbotti@mev.co.uk>
 24  * Devices: [Amplicon] PC36AT (pc36at)
 25  * Updated: Fri, 25 Jul 2014 15:32:40 +0000
 26  * Status: works
 27  *
 28  * Configuration options - PC36AT:
 29  *   [0] - I/O port base address
 30  *   [1] - IRQ (optional)
 31  *
 32  * The PC36AT board has a single 8255 appearing as subdevice 0.
 33  *
 34  * Subdevice 1 pretends to be a digital input device, but it always returns
 35  * 0 when read. However, if you run a command with scan_begin_src=TRIG_EXT,
 36  * a rising edge on port C bit 3 acts as an external trigger, which can be
 37  * used to wake up tasks.  This is like the comedi_parport device, but the
 38  * only way to physically disable the interrupt on the PC36AT is to remove
 39  * the IRQ jumper.  If no interrupt is connected, then subdevice 1 is
 40  * unused.
 41  */
 42 
 43 #include <linux/module.h>
 44 
 45 #include "../comedidev.h"
 46 
 47 #include "amplc_pc236.h"
 48 
 49 static int pc236_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 50 {
 51         struct pc236_private *devpriv;
 52         int ret;
 53 
 54         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
 55         if (!devpriv)
 56                 return -ENOMEM;
 57 
 58         ret = comedi_request_region(dev, it->options[0], 0x4);
 59         if (ret)
 60                 return ret;
 61 
 62         return amplc_pc236_common_attach(dev, dev->iobase, it->options[1], 0);
 63 }
 64 
 65 static const struct pc236_board pc236_boards[] = {
 66         {
 67                 .name = "pc36at",
 68         },
 69 };
 70 
 71 static struct comedi_driver amplc_pc236_driver = {
 72         .driver_name = "amplc_pc236",
 73         .module = THIS_MODULE,
 74         .attach = pc236_attach,
 75         .detach = comedi_legacy_detach,
 76         .board_name = &pc236_boards[0].name,
 77         .offset = sizeof(struct pc236_board),
 78         .num_names = ARRAY_SIZE(pc236_boards),
 79 };
 80 
 81 module_comedi_driver(amplc_pc236_driver);
 82 
 83 MODULE_AUTHOR("Comedi http://www.comedi.org");
 84 MODULE_DESCRIPTION("Comedi driver for Amplicon PC36AT DIO boards");
 85 MODULE_LICENSE("GPL");
 86 

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