linux/drivers/staging/comedi/drivers/amplc_pci236.c
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   1/*
   2 * comedi/drivers/amplc_pci236.c
   3 * Driver for Amplicon PCI236 DIO boards.
   4 *
   5 * Copyright (C) 2002-2014 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_pci236
  22 * Description: Amplicon PCI236
  23 * Author: Ian Abbott <abbotti@mev.co.uk>
  24 * Devices: [Amplicon] PCI236 (amplc_pci236)
  25 * Updated: Fri, 25 Jul 2014 15:32:40 +0000
  26 * Status: works
  27 *
  28 * Configuration options:
  29 *   none
  30 *
  31 * Manual configuration of PCI board (PCI236) is not supported; it is
  32 * configured automatically.
  33 *
  34 * The PCI236 board has a single 8255 appearing as subdevice 0.
  35 *
  36 * Subdevice 1 pretends to be a digital input device, but it always
  37 * returns 0 when read. However, if you run a command with
  38 * scan_begin_src=TRIG_EXT, a rising edge on port C bit 3 acts as an
  39 * external trigger, which can be used to wake up tasks.  This is like
  40 * the comedi_parport device.  If no interrupt is connected, then
  41 * subdevice 1 is unused.
  42 */
  43
  44#include <linux/module.h>
  45#include <linux/pci.h>
  46#include <linux/interrupt.h>
  47
  48#include "../comedidev.h"
  49
  50#include "amplc_pc236.h"
  51#include "plx9052.h"
  52
  53/* Disable, and clear, interrupts */
  54#define PCI236_INTR_DISABLE     (PLX9052_INTCSR_LI1POL |        \
  55                                 PLX9052_INTCSR_LI2POL |        \
  56                                 PLX9052_INTCSR_LI1SEL |        \
  57                                 PLX9052_INTCSR_LI1CLRINT)
  58
  59/* Enable, and clear, interrupts */
  60#define PCI236_INTR_ENABLE      (PLX9052_INTCSR_LI1ENAB |       \
  61                                 PLX9052_INTCSR_LI1POL |        \
  62                                 PLX9052_INTCSR_LI2POL |        \
  63                                 PLX9052_INTCSR_PCIENAB |       \
  64                                 PLX9052_INTCSR_LI1SEL |        \
  65                                 PLX9052_INTCSR_LI1CLRINT)
  66
  67static void pci236_intr_update_cb(struct comedi_device *dev, bool enable)
  68{
  69        struct pc236_private *devpriv = dev->private;
  70
  71        /* this will also clear the "local interrupt 1" latch */
  72        outl(enable ? PCI236_INTR_ENABLE : PCI236_INTR_DISABLE,
  73             devpriv->lcr_iobase + PLX9052_INTCSR);
  74}
  75
  76static bool pci236_intr_chk_clr_cb(struct comedi_device *dev)
  77{
  78        struct pc236_private *devpriv = dev->private;
  79
  80        /* check if interrupt occurred */
  81        if (!(inl(devpriv->lcr_iobase + PLX9052_INTCSR) &
  82              PLX9052_INTCSR_LI1STAT))
  83                return false;
  84        /* clear the interrupt */
  85        pci236_intr_update_cb(dev, devpriv->enable_irq);
  86        return true;
  87}
  88
  89static const struct pc236_board pc236_pci_board = {
  90        .name = "pci236",
  91        .intr_update_cb = pci236_intr_update_cb,
  92        .intr_chk_clr_cb = pci236_intr_chk_clr_cb,
  93};
  94
  95static int pci236_auto_attach(struct comedi_device *dev,
  96                              unsigned long context_unused)
  97{
  98        struct pci_dev *pci_dev = comedi_to_pci_dev(dev);
  99        struct pc236_private *devpriv;
 100        unsigned long iobase;
 101        int ret;
 102
 103        dev_info(dev->class_dev, "amplc_pci236: attach pci %s\n",
 104                 pci_name(pci_dev));
 105
 106        devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
 107        if (!devpriv)
 108                return -ENOMEM;
 109
 110        dev->board_ptr = &pc236_pci_board;
 111        dev->board_name = pc236_pci_board.name;
 112        ret = comedi_pci_enable(dev);
 113        if (ret)
 114                return ret;
 115
 116        devpriv->lcr_iobase = pci_resource_start(pci_dev, 1);
 117        iobase = pci_resource_start(pci_dev, 2);
 118        return amplc_pc236_common_attach(dev, iobase, pci_dev->irq,
 119                                         IRQF_SHARED);
 120}
 121
 122static struct comedi_driver amplc_pci236_driver = {
 123        .driver_name = "amplc_pci236",
 124        .module = THIS_MODULE,
 125        .auto_attach = pci236_auto_attach,
 126        .detach = comedi_pci_detach,
 127};
 128
 129static const struct pci_device_id pci236_pci_table[] = {
 130        { PCI_DEVICE(PCI_VENDOR_ID_AMPLICON, 0x0009) },
 131        { 0 }
 132};
 133
 134MODULE_DEVICE_TABLE(pci, pci236_pci_table);
 135
 136static int amplc_pci236_pci_probe(struct pci_dev *dev,
 137                                  const struct pci_device_id *id)
 138{
 139        return comedi_pci_auto_config(dev, &amplc_pci236_driver,
 140                                      id->driver_data);
 141}
 142
 143static struct pci_driver amplc_pci236_pci_driver = {
 144        .name           = "amplc_pci236",
 145        .id_table       = pci236_pci_table,
 146        .probe          = &amplc_pci236_pci_probe,
 147        .remove         = comedi_pci_auto_unconfig,
 148};
 149
 150module_comedi_pci_driver(amplc_pci236_driver, amplc_pci236_pci_driver);
 151
 152MODULE_AUTHOR("Comedi http://www.comedi.org");
 153MODULE_DESCRIPTION("Comedi driver for Amplicon PCI236 DIO boards");
 154MODULE_LICENSE("GPL");
 155
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