release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include "comedi_pci.h"
  44
  45 #define CNT_DRIVER_NAME         "ke_counter"
  46 #define PCI_VENDOR_ID_KOLTER    0x1001
  47 #define CNT_CARD_DEVICE_ID      0x0014
  48
  49 /*-- function prototypes ----------------------------------------------------*/
  50
  51 static int cnt_attach(struct comedi_device *dev, struct comedi_devconfig *it);
  52 static int cnt_detach(struct comedi_device *dev);
  53
  54 static DEFINE_PCI_DEVICE_TABLE(cnt_pci_table) = {
  55         {
  56         PCI_VENDOR_ID_KOLTER, CNT_CARD_DEVICE_ID, PCI_ANY_ID,
  57                     PCI_ANY_ID, 0, 0, 0}, {
  58         0}
  59 };
  60
  61 MODULE_DEVICE_TABLE(pci, cnt_pci_table);
  62
  63 /*-- board specification structure ------------------------------------------*/
  64
  65 struct cnt_board_struct {
  66
  67         const char *name;
  68         int device_id;
  69         int cnt_channel_nbr;
  70         int cnt_bits;
  71 };
  72
  73 static const struct cnt_board_struct cnt_boards[] = {
  74         {
  75          .name = CNT_DRIVER_NAME,
  76          .device_id = CNT_CARD_DEVICE_ID,
  77          .cnt_channel_nbr = 3,
  78          .cnt_bits = 24}
  79 };
  80
  81 #define cnt_board_nbr (sizeof(cnt_boards)/sizeof(struct cnt_board_struct))
  82
  83 /*-- device private structure -----------------------------------------------*/
  84
  85 struct cnt_device_private {
  86
  87         struct pci_dev *pcidev;
  88 };
  89
  90 #define devpriv ((struct cnt_device_private *)dev->private)
  91
  92 static struct comedi_driver cnt_driver = {
  93         .driver_name = CNT_DRIVER_NAME,
  94         .module = THIS_MODULE,
  95         .attach = cnt_attach,
  96         .detach = cnt_detach,
  97 };
  98
  99 static int __devinit cnt_driver_pci_probe(struct pci_dev *dev,
 100                                           const struct pci_device_id *ent)
 101 {
 102         return comedi_pci_auto_config(dev, cnt_driver.driver_name);
 103 }
 104
 105 static void __devexit cnt_driver_pci_remove(struct pci_dev *dev)
 106 {
 107         comedi_pci_auto_unconfig(dev);
 108 }
 109
 110 static struct pci_driver cnt_driver_pci_driver = {
 111         .id_table = cnt_pci_table,
 112         .probe = &cnt_driver_pci_probe,
 113         .remove = __devexit_p(&cnt_driver_pci_remove)
 114 };
 115
 116 static int __init cnt_driver_init_module(void)
 117 {
 118         int retval;
 119
 120         retval = comedi_driver_register(&cnt_driver);
 121         if (retval < 0)
 122                 return retval;
 123
 124         cnt_driver_pci_driver.name = (char *)cnt_driver.driver_name;
 125         return pci_register_driver(&cnt_driver_pci_driver);
 126 }
 127
 128 static void __exit cnt_driver_cleanup_module(void)
 129 {
 130         pci_unregister_driver(&cnt_driver_pci_driver);
 131         comedi_driver_unregister(&cnt_driver);
 132 }
 133
 134 module_init(cnt_driver_init_module);
 135 module_exit(cnt_driver_cleanup_module);
 136
 137 /*-- counter write ----------------------------------------------------------*/
 138
 139 /* This should be used only for resetting the counters; maybe it is better
 140    to make a special command 'reset'. */
 141 static int cnt_winsn(struct comedi_device *dev,
 142                      struct comedi_subdevice *s, struct comedi_insn *insn,
 143                      unsigned int *data)
 144 {
 145         int chan = CR_CHAN(insn->chanspec);
 146
 147         outb((unsigned char)((data[0] >> 24) & 0xff),
 148              dev->iobase + chan * 0x20 + 0x10);
 149         outb((unsigned char)((data[0] >> 16) & 0xff),
 150              dev->iobase + chan * 0x20 + 0x0c);
 151         outb((unsigned char)((data[0] >> 8) & 0xff),
 152              dev->iobase + chan * 0x20 + 0x08);
 153         outb((unsigned char)((data[0] >> 0) & 0xff),
 154              dev->iobase + chan * 0x20 + 0x04);
 155
 156         /* return the number of samples written */
 157         return 1;
 158 }
 159
 160 /*-- counter read -----------------------------------------------------------*/
 161
 162 static int cnt_rinsn(struct comedi_device *dev,
 163                      struct comedi_subdevice *s, struct comedi_insn *insn,
 164                      unsigned int *data)
 165 {
 166         unsigned char a0, a1, a2, a3, a4;
 167         int chan = CR_CHAN(insn->chanspec);
 168         int result;
 169
 170         a0 = inb(dev->iobase + chan * 0x20);
 171         a1 = inb(dev->iobase + chan * 0x20 + 0x04);
 172         a2 = inb(dev->iobase + chan * 0x20 + 0x08);
 173         a3 = inb(dev->iobase + chan * 0x20 + 0x0c);
 174         a4 = inb(dev->iobase + chan * 0x20 + 0x10);
 175
 176         result = (a1 + (a2 * 256) + (a3 * 65536));
 177         if (a4 > 0)
 178                 result = result - s->maxdata;
 179
 180         *data = (unsigned int)result;
 181
 182         /* return the number of samples read */
 183         return 1;
 184 }
 185
 186 /*-- attach -----------------------------------------------------------------*/
 187
 188 static int cnt_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 189 {
 190         struct comedi_subdevice *subdevice;
 191         struct pci_dev *pci_device = NULL;
 192         struct cnt_board_struct *board;
 193         unsigned long io_base;
 194         int error, i;
 195
 196         /* allocate device private structure */
 197         error = alloc_private(dev, sizeof(struct cnt_device_private));
 198         if (error < 0)
 199                 return error;
 200
 201         /* Probe the device to determine what device in the series it is. */
 202         for_each_pci_dev(pci_device) {
 203                 if (pci_device->vendor == PCI_VENDOR_ID_KOLTER) {
 204                         for (i = 0; i < cnt_board_nbr; i++) {
 205                                 if (cnt_boards[i].device_id ==
 206                                     pci_device->device) {
 207                                         /* was a particular bus/slot requested? */
 208                                         if ((it->options[0] != 0)
 209                                             || (it->options[1] != 0)) {
 210                                                 /* are we on the wrong bus/slot? */
 211                                                 if (pci_device->bus->number !=
 212                                                     it->options[0]
 213                                                     ||
 214                                                     PCI_SLOT(pci_device->devfn)
 215                                                     != it->options[1]) {
 216                                                         continue;
 217                                                 }
 218                                         }
 219
 220                                         dev->board_ptr = cnt_boards + i;
 221                                         board =
 222                                             (struct cnt_board_struct *)
 223                                             dev->board_ptr;
 224                                         goto found;
 225                                 }
 226                         }
 227                 }
 228         }
 229         printk(KERN_WARNING
 230                "comedi%d: no supported board found! (req. bus/slot: %d/%d)\n",
 231                dev->minor, it->options[0], it->options[1]);
 232         return -EIO;
 233
 234 found:
 235         printk(KERN_INFO
 236                "comedi%d: found %s at PCI bus %d, slot %d\n", dev->minor,
 237                board->name, pci_device->bus->number,
 238                PCI_SLOT(pci_device->devfn));
 239         devpriv->pcidev = pci_device;
 240         dev->board_name = board->name;
 241
 242         /* enable PCI device and request regions */
 243         error = comedi_pci_enable(pci_device, CNT_DRIVER_NAME);
 244         if (error < 0) {
 245                 printk(KERN_WARNING "comedi%d: "
 246                        "failed to enable PCI device and request regions!\n",
 247                        dev->minor);
 248                 return error;
 249         }
 250
 251         /* read register base address [PCI_BASE_ADDRESS #0] */
 252         io_base = pci_resource_start(pci_device, 0);
 253         dev->iobase = io_base;
 254
 255         /* allocate the subdevice structures */
 256         error = alloc_subdevices(dev, 1);
 257         if (error < 0)
 258                 return error;
 259
 260         subdevice = dev->subdevices + 0;
 261         dev->read_subdev = subdevice;
 262
 263         subdevice->type = COMEDI_SUBD_COUNTER;
 264         subdevice->subdev_flags = SDF_READABLE /* | SDF_COMMON */ ;
 265         subdevice->n_chan = board->cnt_channel_nbr;
 266         subdevice->maxdata = (1 << board->cnt_bits) - 1;
 267         subdevice->insn_read = cnt_rinsn;
 268         subdevice->insn_write = cnt_winsn;
 269
 270         /*  select 20MHz clock */
 271         outb(3, dev->iobase + 248);
 272
 273         /*  reset all counters */
 274         outb(0, dev->iobase);
 275         outb(0, dev->iobase + 0x20);
 276         outb(0, dev->iobase + 0x40);
 277
 278         printk(KERN_INFO "comedi%d: " CNT_DRIVER_NAME " attached.\n",
 279                dev->minor);
 280         return 0;
 281 }
 282
 283 /*-- detach -----------------------------------------------------------------*/
 284
 285 static int cnt_detach(struct comedi_device *dev)
 286 {
 287         if (devpriv && devpriv->pcidev) {
 288                 if (dev->iobase)
 289                         comedi_pci_disable(devpriv->pcidev);
 290                 pci_dev_put(devpriv->pcidev);
 291         }
 292         printk(KERN_INFO "comedi%d: " CNT_DRIVER_NAME " remove\n",
 293                dev->minor);
 294         return 0;
 295 }
 296
 297 MODULE_AUTHOR("Comedi http://www.comedi.org");
 298 MODULE_DESCRIPTION("Comedi low-level driver");
 299 MODULE_LICENSE("GPL");