root/drivers/staging/comedi/drivers/amplc_pci236.c

DEFINITIONS

1. pci236_intr_update_cb
2. pci236_intr_chk_clr_cb
3. pci236_auto_attach
4. amplc_pci236_pci_probe

   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. <http://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 
  38 #include "../comedi_pci.h"
  39 
  40 #include "amplc_pc236.h"
  41 #include "plx9052.h"
  42 
  43 /* Disable, and clear, interrupts */
  44 #define PCI236_INTR_DISABLE     (PLX9052_INTCSR_LI1POL |        \
  45                                  PLX9052_INTCSR_LI2POL |        \
  46                                  PLX9052_INTCSR_LI1SEL |        \
  47                                  PLX9052_INTCSR_LI1CLRINT)
  48 
  49 /* Enable, and clear, interrupts */
  50 #define PCI236_INTR_ENABLE      (PLX9052_INTCSR_LI1ENAB |       \
  51                                  PLX9052_INTCSR_LI1POL |        \
  52                                  PLX9052_INTCSR_LI2POL |        \
  53                                  PLX9052_INTCSR_PCIENAB |       \
  54                                  PLX9052_INTCSR_LI1SEL |        \
  55                                  PLX9052_INTCSR_LI1CLRINT)
  56 
  57 static void pci236_intr_update_cb(struct comedi_device *dev, bool enable)
  58 {
  59         struct pc236_private *devpriv = dev->private;
  60 
  61         /* this will also clear the "local interrupt 1" latch */
  62         outl(enable ? PCI236_INTR_ENABLE : PCI236_INTR_DISABLE,
  63              devpriv->lcr_iobase + PLX9052_INTCSR);
  64 }
  65 
  66 static bool pci236_intr_chk_clr_cb(struct comedi_device *dev)
  67 {
  68         struct pc236_private *devpriv = dev->private;
  69 
  70         /* check if interrupt occurred */
  71         if (!(inl(devpriv->lcr_iobase + PLX9052_INTCSR) &
  72               PLX9052_INTCSR_LI1STAT))
  73                 return false;
  74         /* clear the interrupt */
  75         pci236_intr_update_cb(dev, devpriv->enable_irq);
  76         return true;
  77 }
  78 
  79 static const struct pc236_board pc236_pci_board = {
  80         .name = "pci236",
  81         .intr_update_cb = pci236_intr_update_cb,
  82         .intr_chk_clr_cb = pci236_intr_chk_clr_cb,
  83 };
  84 
  85 static int pci236_auto_attach(struct comedi_device *dev,
  86                               unsigned long context_unused)
  87 {
  88         struct pci_dev *pci_dev = comedi_to_pci_dev(dev);
  89         struct pc236_private *devpriv;
  90         unsigned long iobase;
  91         int ret;
  92 
  93         dev_info(dev->class_dev, "amplc_pci236: attach pci %s\n",
  94                  pci_name(pci_dev));
  95 
  96         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
  97         if (!devpriv)
  98                 return -ENOMEM;
  99 
 100         dev->board_ptr = &pc236_pci_board;
 101         dev->board_name = pc236_pci_board.name;
 102         ret = comedi_pci_enable(dev);
 103         if (ret)
 104                 return ret;
 105 
 106         devpriv->lcr_iobase = pci_resource_start(pci_dev, 1);
 107         iobase = pci_resource_start(pci_dev, 2);
 108         return amplc_pc236_common_attach(dev, iobase, pci_dev->irq,
 109                                          IRQF_SHARED);
 110 }
 111 
 112 static struct comedi_driver amplc_pci236_driver = {
 113         .driver_name = "amplc_pci236",
 114         .module = THIS_MODULE,
 115         .auto_attach = pci236_auto_attach,
 116         .detach = comedi_pci_detach,
 117 };
 118 
 119 static const struct pci_device_id pci236_pci_table[] = {
 120         { PCI_DEVICE(PCI_VENDOR_ID_AMPLICON, 0x0009) },
 121         { 0 }
 122 };
 123 
 124 MODULE_DEVICE_TABLE(pci, pci236_pci_table);
 125 
 126 static int amplc_pci236_pci_probe(struct pci_dev *dev,
 127                                   const struct pci_device_id *id)
 128 {
 129         return comedi_pci_auto_config(dev, &amplc_pci236_driver,
 130                                       id->driver_data);
 131 }
 132 
 133 static struct pci_driver amplc_pci236_pci_driver = {
 134         .name           = "amplc_pci236",
 135         .id_table       = pci236_pci_table,
 136         .probe          = &amplc_pci236_pci_probe,
 137         .remove         = comedi_pci_auto_unconfig,
 138 };
 139 
 140 module_comedi_pci_driver(amplc_pci236_driver, amplc_pci236_pci_driver);
 141 
 142 MODULE_AUTHOR("Comedi http://www.comedi.org");
 143 MODULE_DESCRIPTION("Comedi driver for Amplicon PCI236 DIO boards");
 144 MODULE_LICENSE("GPL");