2 comedi/drivers/cb_pcidio.c
3 A Comedi driver for PCI-DIO24H & PCI-DIO48H of ComputerBoards (currently MeasurementComputing)
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 2000 David A. Schleef <ds@schleef.org>
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.
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.
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.
25 Description: ComputerBoards' DIO boards with PCI interface
26 Devices: [Measurement Computing] PCI-DIO24 (cb_pcidio), PCI-DIO24H, PCI-DIO48H
27 Author: Yoshiya Matsuzaka
28 Updated: Mon, 29 Oct 2007 15:40:47 +0000
31 This driver has been modified from skel.c of comedi-0.7.70.
33 Configuration Options:
34 [0] - PCI bus of device (optional)
35 [1] - PCI slot of device (optional)
36 If bus/slot is not specified, the first available PCI device will
39 Passing a zero for an option is the same as leaving it unspecified.
42 /*------------------------------ HEADER FILES ---------------------------------*/
43 #include "../comedidev.h"
44 #include "comedi_pci.h"
47 /*-------------------------- MACROS and DATATYPES -----------------------------*/
48 #define PCI_VENDOR_ID_CB 0x1307
51 * Board descriptions for two imaginary boards. Describing the
52 * boards in this way is optional, and completely driver-dependent.
53 * Some drivers use arrays such as this, other do not.
56 const char *name; /* name of the board */
58 int n_8255; /* number of 8255 chips on board */
61 static const struct pcidio_board pcidio_boards[] = {
79 /* This is used by modprobe to translate PCI IDs to drivers. Should
80 * only be used for PCI and ISA-PnP devices */
81 /* Please add your PCI vendor ID to comedidev.h, and it will be forwarded
83 static DEFINE_PCI_DEVICE_TABLE(pcidio_pci_table) = {
84 { PCI_DEVICE(PCI_VENDOR_ID_CB, 0x0028) },
85 { PCI_DEVICE(PCI_VENDOR_ID_CB, 0x0014) },
86 { PCI_DEVICE(PCI_VENDOR_ID_CB, 0x000b) },
90 MODULE_DEVICE_TABLE(pci, pcidio_pci_table);
93 * Useful for shorthand access to the particular board structure
95 #define thisboard ((const struct pcidio_board *)dev->board_ptr)
97 /* this structure is for data unique to this hardware driver. If
98 several hardware drivers keep similar information in this structure,
99 feel free to suggest moving the variable to the struct comedi_device struct. */
100 struct pcidio_private {
101 int data; /* currently unused */
103 /* would be useful for a PCI device */
104 struct pci_dev *pci_dev;
106 /* used for DO readback, currently unused */
107 unsigned int do_readback[4]; /* up to 4 unsigned int suffice to hold 96 bits for PCI-DIO96 */
109 unsigned long dio_reg_base; /* address of port A of the first 8255 chip on board */
113 * most drivers define the following macro to make it easy to
114 * access the private structure.
116 #define devpriv ((struct pcidio_private *)dev->private)
119 * The struct comedi_driver structure tells the Comedi core module
120 * which functions to call to configure/deconfigure (attach/detach)
121 * the board, and also about the kernel module that contains
124 static int pcidio_attach(struct comedi_device *dev,
125 struct comedi_devconfig *it);
126 static int pcidio_detach(struct comedi_device *dev);
127 static struct comedi_driver driver_cb_pcidio = {
128 .driver_name = "cb_pcidio",
129 .module = THIS_MODULE,
130 .attach = pcidio_attach,
131 .detach = pcidio_detach,
133 /* It is not necessary to implement the following members if you are
134 * writing a driver for a ISA PnP or PCI card */
136 /* Most drivers will support multiple types of boards by
137 * having an array of board structures. These were defined
138 * in pcidio_boards[] above. Note that the element 'name'
139 * was first in the structure -- Comedi uses this fact to
140 * extract the name of the board without knowing any details
141 * about the structure except for its length.
142 * When a device is attached (by comedi_config), the name
143 * of the device is given to Comedi, and Comedi tries to
144 * match it by going through the list of board names. If
145 * there is a match, the address of the pointer is put
146 * into dev->board_ptr and driver->attach() is called.
148 * Note that these are not necessary if you can determine
149 * the type of board in software. ISA PnP, PCI, and PCMCIA
150 * devices are such boards.
153 /* The following fields should NOT be initialized if you are dealing
156 * .board_name = pcidio_boards,
157 * .offset = sizeof(struct pcidio_board),
158 * .num_names = sizeof(pcidio_boards) / sizeof(structpcidio_board),
163 /*------------------------------- FUNCTIONS -----------------------------------*/
166 * Attach is called by the Comedi core to configure the driver
167 * for a particular board. If you specified a board_name array
168 * in the driver structure, dev->board_ptr contains that
171 static int pcidio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
173 struct pci_dev *pcidev = NULL;
177 printk("comedi%d: cb_pcidio: \n", dev->minor);
180 * Allocate the private structure area. alloc_private() is a
181 * convenient macro defined in comedidev.h.
183 if (alloc_private(dev, sizeof(struct pcidio_private)) < 0)
186 * If you can probe the device to determine what device in a series
187 * it is, this is the place to do it. Otherwise, dev->board_ptr
188 * should already be initialized.
191 * Probe the device to determine what device in the series it is.
194 for_each_pci_dev(pcidev) {
195 /* is it not a computer boards card? */
196 if (pcidev->vendor != PCI_VENDOR_ID_CB)
198 /* loop through cards supported by this driver */
199 for (index = 0; index < ARRAY_SIZE(pcidio_boards); index++) {
200 if (pcidio_boards[index].dev_id != pcidev->device)
203 /* was a particular bus/slot requested? */
204 if (it->options[0] || it->options[1]) {
205 /* are we on the wrong bus/slot? */
206 if (pcidev->bus->number != it->options[0] ||
207 PCI_SLOT(pcidev->devfn) != it->options[1]) {
211 dev->board_ptr = pcidio_boards + index;
216 printk("No supported ComputerBoards/MeasurementComputing card found on "
217 "requested position\n");
223 * Initialize dev->board_name. Note that we can use the "thisboard"
224 * macro now, since we just initialized it in the last line.
226 dev->board_name = thisboard->name;
228 devpriv->pci_dev = pcidev;
229 printk("Found %s on bus %i, slot %i\n", thisboard->name,
230 devpriv->pci_dev->bus->number,
231 PCI_SLOT(devpriv->pci_dev->devfn));
232 if (comedi_pci_enable(pcidev, thisboard->name)) {
234 ("cb_pcidio: failed to enable PCI device and request regions\n");
238 * Use PCI BAR 2 region if non-zero length, else use PCI BAR 1 region.
239 * PCI BAR 1 is only used for older PCI-DIO48H boards. At some point
240 * the PCI-DIO48H was redesigned to use the same PCI interface chip
241 * (and same PCI BAR region) as the other boards.
243 devpriv->dio_reg_base =
244 pci_resource_start(devpriv->pci_dev,
245 (pci_resource_len(pcidev, 2) ? 2 : 1));
248 * Allocate the subdevice structures. alloc_subdevice() is a
249 * convenient macro defined in comedidev.h.
251 if (alloc_subdevices(dev, thisboard->n_8255) < 0)
254 for (i = 0; i < thisboard->n_8255; i++) {
255 subdev_8255_init(dev, dev->subdevices + i,
256 NULL, devpriv->dio_reg_base + i * 4);
257 printk(" subdev %d: base = 0x%lx\n", i,
258 devpriv->dio_reg_base + i * 4);
261 printk("attached\n");
266 * _detach is called to deconfigure a device. It should deallocate
268 * This function is also called when _attach() fails, so it should be
269 * careful not to release resources that were not necessarily
270 * allocated by _attach(). dev->private and dev->subdevices are
271 * deallocated automatically by the core.
273 static int pcidio_detach(struct comedi_device *dev)
275 printk("comedi%d: cb_pcidio: remove\n", dev->minor);
277 if (devpriv->pci_dev) {
278 if (devpriv->dio_reg_base)
279 comedi_pci_disable(devpriv->pci_dev);
280 pci_dev_put(devpriv->pci_dev);
283 if (dev->subdevices) {
285 for (i = 0; i < thisboard->n_8255; i++)
286 subdev_8255_cleanup(dev, dev->subdevices + i);
292 * A convenient macro that defines init_module() and cleanup_module(),
295 static int __devinit driver_cb_pcidio_pci_probe(struct pci_dev *dev,
296 const struct pci_device_id *ent)
298 return comedi_pci_auto_config(dev, driver_cb_pcidio.driver_name);
301 static void __devexit driver_cb_pcidio_pci_remove(struct pci_dev *dev)
303 comedi_pci_auto_unconfig(dev);
306 static struct pci_driver driver_cb_pcidio_pci_driver = {
307 .id_table = pcidio_pci_table,
308 .probe = &driver_cb_pcidio_pci_probe,
309 .remove = __devexit_p(&driver_cb_pcidio_pci_remove)
312 static int __init driver_cb_pcidio_init_module(void)
316 retval = comedi_driver_register(&driver_cb_pcidio);
320 driver_cb_pcidio_pci_driver.name = (char *)driver_cb_pcidio.driver_name;
321 return pci_register_driver(&driver_cb_pcidio_pci_driver);
324 static void __exit driver_cb_pcidio_cleanup_module(void)
326 pci_unregister_driver(&driver_cb_pcidio_pci_driver);
327 comedi_driver_unregister(&driver_cb_pcidio);
330 module_init(driver_cb_pcidio_init_module);
331 module_exit(driver_cb_pcidio_cleanup_module);
333 MODULE_AUTHOR("Comedi http://www.comedi.org");
334 MODULE_DESCRIPTION("Comedi low-level driver");
335 MODULE_LICENSE("GPL");