2 comedi/drivers/comedi_pci.h
3 Various PCI functions for drivers.
5 Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/>
7 COMEDI - Linux Control and Measurement Device Interface
8 Copyright (C) 2000 David A. Schleef <ds@schleef.org>
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #ifndef _COMEDI_PCI_H_
27 #define _COMEDI_PCI_H_
29 #include <linux/version.h>
30 #include <linux/pci.h>
32 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
33 #define PCI_ENABLE_IS_REFCOUNTED
37 * Enables PCI device without requesting regions. Just a simple wrapper
38 * for pci_enable_device().
40 static inline int comedi_pci_enable_no_regions(struct pci_dev *pdev)
42 return pci_enable_device(pdev);
46 * Called to disable PCI device if PCI device has been enabled, but
47 * PCI regions have not been reserved.
49 * It only disables the PCI device if the kernel supports reference
50 * counting of PCI enables, otherwise it might stop the device working
51 * in another driver instance.
53 static inline void comedi_pci_disable_no_regions(struct pci_dev *pdev)
55 #ifdef PCI_ENABLE_IS_REFCOUNTED
56 pci_disable_device(pdev);
61 * Enable the PCI device and request the regions.
63 static inline int comedi_pci_enable(struct pci_dev *pdev, const char *res_name)
67 rc = pci_enable_device(pdev);
71 rc = pci_request_regions(pdev, res_name);
73 comedi_pci_disable_no_regions(pdev);
79 * Release the regions and disable the PCI device.
81 * This must be matched with a previous successful call to comedi_pci_enable().
83 static inline void comedi_pci_disable(struct pci_dev *pdev)
85 pci_release_regions(pdev);
86 pci_disable_device(pdev);