drivers/staging/comedi/drivers/pcl724.c

   1 /*
   2  * pcl724.c
   3  * Comedi driver for 8255 based ISA DIO boards
   4  *
   5  * Michal Dobes <dobes@tesnet.cz>
   6  */
   7
   8 /*
   9  * Driver: pcl724
  10  * Description: Comedi driver for 8255 based ISA DIO boards
  11  * Devices: (Advantech) PCL-724 [pcl724]
  12  *          (Advantech) PCL-722 [pcl722]
  13  *          (Advantech) PCL-731 [pcl731]
  14  *          (ADLink) ACL-7122 [acl7122]
  15  *          (ADLink) ACL-7124 [acl7124]
  16  *          (ADLink) PET-48DIO [pet48dio]
  17  * Author: Michal Dobes <dobes@tesnet.cz>
  18  * Status: untested
  19  *
  20  * Configuration options:
  21  *   [0] - IO Base
  22  *   [1] - IRQ (not supported)
  23  *   [2] - number of DIO (pcl722 and acl7122 boards)
  24  *         0, 144: 144 DIO configuration
  25  *         1,  96:  96 DIO configuration
  26  */
  27
  28 #include "../comedidev.h"
  29
  30 #include <linux/ioport.h>
  31 #include <linux/delay.h>
  32
  33 #include "8255.h"
  34
  35 #define SIZE_8255       4
  36
  37 struct pcl724_board {
  38         const char *name;
  39         unsigned int io_range;
  40         unsigned int can_have96:1;
  41         unsigned int is_pet48:1;
  42         int numofports;
  43 };
  44
  45 static const struct pcl724_board boardtypes[] = {
  46         {
  47                 .name           = "pcl724",
  48                 .io_range       = 0x04,
  49                 .numofports     = 1,    /* 24 DIO channels */
  50         }, {
  51                 .name           = "pcl722",
  52                 .io_range       = 0x20,
  53                 .can_have96     = 1,
  54                 .numofports     = 6,    /* 144 (or 96) DIO channels */
  55         }, {
  56                 .name           = "pcl731",
  57                 .io_range       = 0x08,
  58                 .numofports     = 2,    /* 48 DIO channels */
  59         }, {
  60                 .name           = "acl7122",
  61                 .io_range       = 0x20,
  62                 .can_have96     = 1,
  63                 .numofports     = 6,    /* 144 (or 96) DIO channels */
  64         }, {
  65                 .name           = "acl7124",
  66                 .io_range       = 0x04,
  67                 .numofports     = 1,    /* 24 DIO channels */
  68         }, {
  69                 .name           = "pet48dio",
  70                 .io_range       = 0x02,
  71                 .is_pet48       = 1,
  72                 .numofports     = 2,    /* 48 DIO channels */
  73         },
  74 };
  75
  76 static int pcl724_8255mapped_io(int dir, int port, int data,
  77                                 unsigned long iobase)
  78 {
  79         int movport = SIZE_8255 * (iobase >> 12);
  80
  81         iobase &= 0x0fff;
  82
  83         if (dir) {
  84                 outb(port + movport, iobase);
  85                 outb(data, iobase + 1);
  86                 return 0;
  87         } else {
  88                 outb(port + movport, iobase);
  89                 return inb(iobase + 1);
  90         }
  91 }
  92
  93 static int pcl724_attach(struct comedi_device *dev,
  94                          struct comedi_devconfig *it)
  95 {
  96         const struct pcl724_board *board = comedi_board(dev);
  97         struct comedi_subdevice *s;
  98         unsigned long iobase;
  99         unsigned int iorange;
 100         int n_subdevices;
 101         int ret;
 102         int i;
 103
 104         iorange = board->io_range;
 105         n_subdevices = board->numofports;
 106
 107         /* Handle PCL-724 in 96 DIO configuration */
 108         if (board->can_have96 &&
 109             (it->options[2] == 1 || it->options[2] == 96)) {
 110                 iorange = 0x10;
 111                 n_subdevices = 4;
 112         }
 113
 114         ret = comedi_request_region(dev, it->options[0], iorange);
 115         if (ret)
 116                 return ret;
 117
 118         ret = comedi_alloc_subdevices(dev, n_subdevices);
 119         if (ret)
 120                 return ret;
 121
 122         for (i = 0; i < dev->n_subdevices; i++) {
 123                 s = &dev->subdevices[i];
 124                 if (board->is_pet48) {
 125                         iobase = dev->iobase + (i * 0x1000);
 126                         ret = subdev_8255_init(dev, s, pcl724_8255mapped_io,
 127                                                iobase);
 128                 } else {
 129                         iobase = dev->iobase + (i * SIZE_8255);
 130                         ret = subdev_8255_init(dev, s, NULL, iobase);
 131                 }
 132                 if (ret)
 133                         return ret;
 134         }
 135
 136         return 0;
 137 }
 138
 139 static struct comedi_driver pcl724_driver = {
 140         .driver_name    = "pcl724",
 141         .module         = THIS_MODULE,
 142         .attach         = pcl724_attach,
 143         .detach         = comedi_legacy_detach,
 144         .board_name     = &boardtypes[0].name,
 145         .num_names      = ARRAY_SIZE(boardtypes),
 146         .offset         = sizeof(struct pcl724_board),
 147 };
 148 module_comedi_driver(pcl724_driver);
 149
 150 MODULE_AUTHOR("Comedi http://www.comedi.org");
 151 MODULE_DESCRIPTION("Comedi driver for 8255 based ISA DIO boards");
 152 MODULE_LICENSE("GPL");