drivers/staging/comedi/drivers/ke_counter.c

   1 /*
   2     comedi/drivers/ke_counter.c
   3     Comedi driver for Kolter-Electronic PCI Counter 1 Card
   4
   5     COMEDI - Linux Control and Measurement Device Interface
   6     Copyright (C) 2000 David A. Schleef <ds@schleef.org>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23 /*
  24 Driver: ke_counter
  25 Description: Driver for Kolter Electronic Counter Card
  26 Devices: [Kolter Electronic] PCI Counter Card (ke_counter)
  27 Author: Michael Hillmann
  28 Updated: Mon, 14 Apr 2008 15:42:42 +0100
  29 Status: tested
  30
  31 Configuration Options:
  32   [0] - PCI bus of device (optional)
  33   [1] - PCI slot of device (optional)
  34   If bus/slot is not specified, the first supported
  35   PCI device found will be used.
  36
  37 This driver is a simple driver to read the counter values from
  38 Kolter Electronic PCI Counter Card.
  39 */
  40
  41 #include "../comedidev.h"
  42
  43 #define CNT_DRIVER_NAME         "ke_counter"
  44 #define PCI_VENDOR_ID_KOLTER    0x1001
  45 #define CNT_CARD_DEVICE_ID      0x0014
  46
  47 /*-- board specification structure ------------------------------------------*/
  48
  49 struct cnt_board_struct {
  50
  51         const char *name;
  52         int device_id;
  53         int cnt_channel_nbr;
  54         int cnt_bits;
  55 };
  56
  57 static const struct cnt_board_struct cnt_boards[] = {
  58         {
  59          .name = CNT_DRIVER_NAME,
  60          .device_id = CNT_CARD_DEVICE_ID,
  61          .cnt_channel_nbr = 3,
  62          .cnt_bits = 24}
  63 };
  64
  65 #define cnt_board_nbr (sizeof(cnt_boards)/sizeof(struct cnt_board_struct))
  66
  67 /*-- device private structure -----------------------------------------------*/
  68
  69 struct cnt_device_private {
  70
  71         struct pci_dev *pcidev;
  72 };
  73
  74 #define devpriv ((struct cnt_device_private *)dev->private)
  75
  76 /*-- counter write ----------------------------------------------------------*/
  77
  78 /* This should be used only for resetting the counters; maybe it is better
  79    to make a special command 'reset'. */
  80 static int cnt_winsn(struct comedi_device *dev,
  81                      struct comedi_subdevice *s, struct comedi_insn *insn,
  82                      unsigned int *data)
  83 {
  84         int chan = CR_CHAN(insn->chanspec);
  85
  86         outb((unsigned char)((data[0] >> 24) & 0xff),
  87              dev->iobase + chan * 0x20 + 0x10);
  88         outb((unsigned char)((data[0] >> 16) & 0xff),
  89              dev->iobase + chan * 0x20 + 0x0c);
  90         outb((unsigned char)((data[0] >> 8) & 0xff),
  91              dev->iobase + chan * 0x20 + 0x08);
  92         outb((unsigned char)((data[0] >> 0) & 0xff),
  93              dev->iobase + chan * 0x20 + 0x04);
  94
  95         /* return the number of samples written */
  96         return 1;
  97 }
  98
  99 /*-- counter read -----------------------------------------------------------*/
 100
 101 static int cnt_rinsn(struct comedi_device *dev,
 102                      struct comedi_subdevice *s, struct comedi_insn *insn,
 103                      unsigned int *data)
 104 {
 105         unsigned char a0, a1, a2, a3, a4;
 106         int chan = CR_CHAN(insn->chanspec);
 107         int result;
 108
 109         a0 = inb(dev->iobase + chan * 0x20);
 110         a1 = inb(dev->iobase + chan * 0x20 + 0x04);
 111         a2 = inb(dev->iobase + chan * 0x20 + 0x08);
 112         a3 = inb(dev->iobase + chan * 0x20 + 0x0c);
 113         a4 = inb(dev->iobase + chan * 0x20 + 0x10);
 114
 115         result = (a1 + (a2 * 256) + (a3 * 65536));
 116         if (a4 > 0)
 117                 result = result - s->maxdata;
 118
 119         *data = (unsigned int)result;
 120
 121         /* return the number of samples read */
 122         return 1;
 123 }
 124
 125 static int cnt_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 126 {
 127         struct comedi_subdevice *subdevice;
 128         struct pci_dev *pci_device = NULL;
 129         struct cnt_board_struct *board;
 130         unsigned long io_base;
 131         int error, i;
 132
 133         /* allocate device private structure */
 134         error = alloc_private(dev, sizeof(struct cnt_device_private));
 135         if (error < 0)
 136                 return error;
 137
 138         /* Probe the device to determine what device in the series it is. */
 139         for_each_pci_dev(pci_device) {
 140                 if (pci_device->vendor == PCI_VENDOR_ID_KOLTER) {
 141                         for (i = 0; i < cnt_board_nbr; i++) {
 142                                 if (cnt_boards[i].device_id ==
 143                                     pci_device->device) {
 144                                         /* was a particular bus/slot requested? */
 145                                         if ((it->options[0] != 0)
 146                                             || (it->options[1] != 0)) {
 147                                                 /* are we on the wrong bus/slot? */
 148                                                 if (pci_device->bus->number !=
 149                                                     it->options[0]
 150                                                     ||
 151                                                     PCI_SLOT(pci_device->devfn)
 152                                                     != it->options[1]) {
 153                                                         continue;
 154                                                 }
 155                                         }
 156
 157                                         dev->board_ptr = cnt_boards + i;
 158                                         board =
 159                                             (struct cnt_board_struct *)
 160                                             dev->board_ptr;
 161                                         goto found;
 162                                 }
 163                         }
 164                 }
 165         }
 166         printk(KERN_WARNING
 167                "comedi%d: no supported board found! (req. bus/slot: %d/%d)\n",
 168                dev->minor, it->options[0], it->options[1]);
 169         return -EIO;
 170
 171 found:
 172         printk(KERN_INFO
 173                "comedi%d: found %s at PCI bus %d, slot %d\n", dev->minor,
 174                board->name, pci_device->bus->number,
 175                PCI_SLOT(pci_device->devfn));
 176         devpriv->pcidev = pci_device;
 177         dev->board_name = board->name;
 178
 179         /* enable PCI device and request regions */
 180         error = comedi_pci_enable(pci_device, CNT_DRIVER_NAME);
 181         if (error < 0) {
 182                 printk(KERN_WARNING "comedi%d: "
 183                        "failed to enable PCI device and request regions!\n",
 184                        dev->minor);
 185                 return error;
 186         }
 187
 188         /* read register base address [PCI_BASE_ADDRESS #0] */
 189         io_base = pci_resource_start(pci_device, 0);
 190         dev->iobase = io_base;
 191
 192         error = comedi_alloc_subdevices(dev, 1);
 193         if (error)
 194                 return error;
 195
 196         subdevice = dev->subdevices + 0;
 197         dev->read_subdev = subdevice;
 198
 199         subdevice->type = COMEDI_SUBD_COUNTER;
 200         subdevice->subdev_flags = SDF_READABLE /* | SDF_COMMON */ ;
 201         subdevice->n_chan = board->cnt_channel_nbr;
 202         subdevice->maxdata = (1 << board->cnt_bits) - 1;
 203         subdevice->insn_read = cnt_rinsn;
 204         subdevice->insn_write = cnt_winsn;
 205
 206         /*  select 20MHz clock */
 207         outb(3, dev->iobase + 248);
 208
 209         /*  reset all counters */
 210         outb(0, dev->iobase);
 211         outb(0, dev->iobase + 0x20);
 212         outb(0, dev->iobase + 0x40);
 213
 214         printk(KERN_INFO "comedi%d: " CNT_DRIVER_NAME " attached.\n",
 215                dev->minor);
 216         return 0;
 217 }
 218
 219 static void cnt_detach(struct comedi_device *dev)
 220 {
 221         if (devpriv && devpriv->pcidev) {
 222                 if (dev->iobase)
 223                         comedi_pci_disable(devpriv->pcidev);
 224                 pci_dev_put(devpriv->pcidev);
 225         }
 226 }
 227
 228 static struct comedi_driver ke_counter_driver = {
 229         .driver_name    = "ke_counter",
 230         .module         = THIS_MODULE,
 231         .attach         = cnt_attach,
 232         .detach         = cnt_detach,
 233 };
 234
 235 static int __devinit ke_counter_pci_probe(struct pci_dev *dev,
 236                                           const struct pci_device_id *ent)
 237 {
 238         return comedi_pci_auto_config(dev, &ke_counter_driver);
 239 }
 240
 241 static void __devexit ke_counter_pci_remove(struct pci_dev *dev)
 242 {
 243         comedi_pci_auto_unconfig(dev);
 244 }
 245
 246 static DEFINE_PCI_DEVICE_TABLE(ke_counter_pci_table) = {
 247         { PCI_DEVICE(PCI_VENDOR_ID_KOLTER, CNT_CARD_DEVICE_ID) },
 248         { 0 }
 249 };
 250 MODULE_DEVICE_TABLE(pci, ke_counter_pci_table);
 251
 252 static struct pci_driver ke_counter_pci_driver = {
 253         .name           = "ke_counter",
 254         .id_table       = ke_counter_pci_table,
 255         .probe          = ke_counter_pci_probe,
 256         .remove         = __devexit_p(ke_counter_pci_remove),
 257 };
 258 module_comedi_pci_driver(ke_counter_driver, ke_counter_pci_driver);
 259
 260 MODULE_AUTHOR("Comedi http://www.comedi.org");
 261 MODULE_DESCRIPTION("Comedi low-level driver");
 262 MODULE_LICENSE("GPL");