pci_find_capability
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## Name

pci_find_capability — query for devices' capabilities

## Synopsis

`int pci_find_capability (` | struct pci_dev * dev,
| int cap`)`;

## Arguments

`dev`

  PCI device to query

`cap`

  capability code

## Description

Tell if a device supports a given PCI capability. Returns the address of the requested capability structure within the device's PCI configuration space or 0 in case the device does not support it. Possible values for `cap`:

`PCI_CAP_ID_PM` Power Management `PCI_CAP_ID_AGP` Accelerated Graphics Port `PCI_CAP_ID_VPD` Vital Product Data `PCI_CAP_ID_SLOTID` Slot Identification `PCI_CAP_ID_MSI` Message Signalled Interrupts `PCI_CAP_ID_CHSWP` CompactPCI HotSwap `PCI_CAP_ID_PCIX` PCI-X `PCI_CAP_ID_EXP` PCI Express

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