LXR linux/drivers/comedi/drivers/amplc

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * comedi/drivers/amplc_pci236.c
   4 * Driver for Amplicon PCI236 DIO boards.
   5 *
   6 * Copyright (C) 2002-2014 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_pci236
  13 * Description: Amplicon PCI236
  14 * Author: Ian Abbott <abbotti@mev.co.uk>
  15 * Devices: [Amplicon] PCI236 (amplc_pci236)
  16 * Updated: Fri, 25 Jul 2014 15:32:40 +0000
  17 * Status: works
  18 *
  19 * Configuration options:
  20 *   none
  21 *
  22 * Manual configuration of PCI board (PCI236) is not supported; it is
  23 * configured automatically.
  24 *
  25 * The PCI236 board has a single 8255 appearing as subdevice 0.
  26 *
  27 * Subdevice 1 pretends to be a digital input device, but it always
  28 * returns 0 when read. However, if you run a command with
  29 * scan_begin_src=TRIG_EXT, a rising edge on port C bit 3 acts as an
  30 * external trigger, which can be used to wake up tasks.  This is like
  31 * the comedi_parport device.  If no interrupt is connected, then
  32 * subdevice 1 is unused.
  33 */
  34
  35#include <linux/module.h>
  36#include <linux/interrupt.h>
  37#include <linux/comedi/comedi_pci.h>
  38
  39#include "amplc_pc236.h"
  40#include "plx9052.h"
  41
  42/* Disable, and clear, interrupts */
  43#define PCI236_INTR_DISABLE     (PLX9052_INTCSR_LI1POL |        \
  44                                 PLX9052_INTCSR_LI2POL |        \
  45                                 PLX9052_INTCSR_LI1SEL |        \
  46                                 PLX9052_INTCSR_LI1CLRINT)
  47
  48/* Enable, and clear, interrupts */
  49#define PCI236_INTR_ENABLE      (PLX9052_INTCSR_LI1ENAB |       \
  50                                 PLX9052_INTCSR_LI1POL |        \
  51                                 PLX9052_INTCSR_LI2POL |        \
  52                                 PLX9052_INTCSR_PCIENAB |       \
  53                                 PLX9052_INTCSR_LI1SEL |        \
  54                                 PLX9052_INTCSR_LI1CLRINT)
  55
  56static void pci236_intr_update_cb(struct comedi_device *dev, bool enable)
  57{
  58        struct pc236_private *devpriv = dev->private;
  59
  60        /* this will also clear the "local interrupt 1" latch */
  61        outl(enable ? PCI236_INTR_ENABLE : PCI236_INTR_DISABLE,
  62             devpriv->lcr_iobase + PLX9052_INTCSR);
  63}
  64
  65static bool pci236_intr_chk_clr_cb(struct comedi_device *dev)
  66{
  67        struct pc236_private *devpriv = dev->private;
  68
  69        /* check if interrupt occurred */
  70        if (!(inl(devpriv->lcr_iobase + PLX9052_INTCSR) &
  71              PLX9052_INTCSR_LI1STAT))
  72                return false;
  73        /* clear the interrupt */
  74        pci236_intr_update_cb(dev, devpriv->enable_irq);
  75        return true;
  76}
  77
  78static const struct pc236_board pc236_pci_board = {
  79        .name = "pci236",
  80        .intr_update_cb = pci236_intr_update_cb,
  81        .intr_chk_clr_cb = pci236_intr_chk_clr_cb,
  82};
  83
  84static int pci236_auto_attach(struct comedi_device *dev,
  85                              unsigned long context_unused)
  86{
  87        struct pci_dev *pci_dev = comedi_to_pci_dev(dev);
  88        struct pc236_private *devpriv;
  89        unsigned long iobase;
  90        int ret;
  91
  92        dev_info(dev->class_dev, "amplc_pci236: attach pci %s\n",
  93                 pci_name(pci_dev));
  94
  95        devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
  96        if (!devpriv)
  97                return -ENOMEM;
  98
  99        dev->board_ptr = &pc236_pci_board;
 100        dev->board_name = pc236_pci_board.name;
 101        ret = comedi_pci_enable(dev);
 102        if (ret)
 103                return ret;
 104
 105        devpriv->lcr_iobase = pci_resource_start(pci_dev, 1);
 106        iobase = pci_resource_start(pci_dev, 2);
 107        return amplc_pc236_common_attach(dev, iobase, pci_dev->irq,
 108                                         IRQF_SHARED);
 109}
 110
 111static struct comedi_driver amplc_pci236_driver = {
 112        .driver_name = "amplc_pci236",
 113        .module = THIS_MODULE,
 114        .auto_attach = pci236_auto_attach,
 115        .detach = comedi_pci_detach,
 116};
 117
 118static const struct pci_device_id pci236_pci_table[] = {
 119        { PCI_DEVICE(PCI_VENDOR_ID_AMPLICON, 0x0009) },
 120        { 0 }
 121};
 122
 123MODULE_DEVICE_TABLE(pci, pci236_pci_table);
 124
 125static int amplc_pci236_pci_probe(struct pci_dev *dev,
 126                                  const struct pci_device_id *id)
 127{
 128        return comedi_pci_auto_config(dev, &amplc_pci236_driver,
 129                                      id->driver_data);
 130}
 131
 132static struct pci_driver amplc_pci236_pci_driver = {
 133        .name           = "amplc_pci236",
 134        .id_table       = pci236_pci_table,
 135        .probe          = &amplc_pci236_pci_probe,
 136        .remove         = comedi_pci_auto_unconfig,
 137};
 138
 139module_comedi_pci_driver(amplc_pci236_driver, amplc_pci236_pci_driver);
 140
 141MODULE_AUTHOR("Comedi https://www.comedi.org");
 142MODULE_DESCRIPTION("Comedi driver for Amplicon PCI236 DIO boards");
 143MODULE_LICENSE("GPL");
 144