/*
* PCI searching functions.
*
- * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter,
- * David Mosberger-Tang
- * Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz>
- * Copyright 2003 -- Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 1993 -- 1997 Drew Eckhardt, Frederic Potter,
+ * David Mosberger-Tang
+ * Copyright (C) 1997 -- 2000 Martin Mares <mj@ucw.cz>
+ * Copyright (C) 2003 -- 2004 Greg Kroah-Hartman <greg@kroah.com>
*/
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/interrupt.h>
+#include "pci.h"
-spinlock_t pci_bus_lock = SPIN_LOCK_UNLOCKED;
+DEFINE_SPINLOCK(pci_bus_lock);
static struct pci_bus * __devinit
pci_do_find_bus(struct pci_bus* bus, unsigned char busnr)
* the pci device returned by this function can disappear at any moment in
* time.
*/
-struct pci_dev *
-pci_find_subsys(unsigned int vendor, unsigned int device,
- unsigned int ss_vendor, unsigned int ss_device,
- const struct pci_dev *from)
+static struct pci_dev * pci_find_subsys(unsigned int vendor,
+ unsigned int device,
+ unsigned int ss_vendor,
+ unsigned int ss_device,
+ const struct pci_dev *from)
{
struct list_head *n;
struct pci_dev *dev;
* @from: Previous PCI device found in search, or %NULL for new search.
*
* Iterates through the list of known PCI devices. If a PCI device is
- * found with a matching @vendor and @device, a pointer to its device structure is
- * returned. Otherwise, %NULL is returned.
- * A new search is initiated by passing %NULL to the @from argument.
- * Otherwise if @from is not %NULL, searches continue from next device on the global list.
- *
- * Iterates through the list of known PCI devices. If a PCI device is
* found with a matching @vendor and @device, the reference count to the
* device is incremented and a pointer to its device structure is returned.
* Otherwise, %NULL is returned. A new search is initiated by passing %NULL
return dev;
}
-
/**
- * pci_find_class - begin or continue searching for a PCI device by class
+ * pci_get_class - begin or continue searching for a PCI device by class
* @class: search for a PCI device with this class designation
* @from: Previous PCI device found in search, or %NULL for new search.
*
* Iterates through the list of known PCI devices. If a PCI device is
- * found with a matching @class, a pointer to its device structure is
- * returned. Otherwise, %NULL is returned.
+ * found with a matching @class, the reference count to the device is
+ * incremented and a pointer to its device structure is returned.
+ * Otherwise, %NULL is returned.
* A new search is initiated by passing %NULL to the @from argument.
* Otherwise if @from is not %NULL, searches continue from next device
- * on the global list.
+ * on the global list. The reference count for @from is always decremented
+ * if it is not %NULL.
*/
-struct pci_dev *
-pci_find_class(unsigned int class, const struct pci_dev *from)
+struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from)
{
struct list_head *n;
struct pci_dev *dev;
+ WARN_ON(in_interrupt());
spin_lock(&pci_bus_lock);
n = from ? from->global_list.next : pci_devices.next;
}
dev = NULL;
exit:
+ pci_dev_put(from);
+ dev = pci_dev_get(dev);
spin_unlock(&pci_bus_lock);
return dev;
}
+/**
+ * pci_dev_present - Returns 1 if device matching the device list is present, 0 if not.
+ * @ids: A pointer to a null terminated list of struct pci_device_id structures
+ * that describe the type of PCI device the caller is trying to find.
+ *
+ * Obvious fact: You do not have a reference to any device that might be found
+ * by this function, so if that device is removed from the system right after
+ * this function is finished, the value will be stale. Use this function to
+ * find devices that are usually built into a system, or for a general hint as
+ * to if another device happens to be present at this specific moment in time.
+ */
+int pci_dev_present(const struct pci_device_id *ids)
+{
+ struct pci_dev *dev;
+ int found = 0;
+
+ WARN_ON(in_interrupt());
+ spin_lock(&pci_bus_lock);
+ while (ids->vendor || ids->subvendor || ids->class_mask) {
+ list_for_each_entry(dev, &pci_devices, global_list) {
+ if (pci_match_one_device(ids, dev)) {
+ found = 1;
+ goto exit;
+ }
+ }
+ ids++;
+ }
+exit:
+ spin_unlock(&pci_bus_lock);
+ return found;
+}
+EXPORT_SYMBOL(pci_dev_present);
+
EXPORT_SYMBOL(pci_find_bus);
-EXPORT_SYMBOL(pci_find_class);
EXPORT_SYMBOL(pci_find_device);
EXPORT_SYMBOL(pci_find_device_reverse);
EXPORT_SYMBOL(pci_find_slot);
-EXPORT_SYMBOL(pci_find_subsys);
EXPORT_SYMBOL(pci_get_device);
EXPORT_SYMBOL(pci_get_subsys);
EXPORT_SYMBOL(pci_get_slot);
+EXPORT_SYMBOL(pci_get_class);
git://git.onelab.eu / linux-2.6.git / blobdiff