During the 2012 Media Workshop it was decided that bus_info as returned
by VIDIOC_QUERYCAP can no longer be empty. It should be a unique identifier,
and empty strings are obviously not unique.
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
Reviewed-by: Sylwester Nawrocki <s.nawro...@samsung.com>
---
Documentation/DocBook/media/v4l/vidioc-querycap.xml | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/Documentation/DocBook/media/v4l/vidioc-querycap.xml
b/Documentation/DocBook/media/v4l/vidioc-querycap.xml
index f33dd74..4c70215 100644
--- a/Documentation/DocBook/media/v4l/vidioc-querycap.xml
+++ b/Documentation/DocBook/media/v4l/vidioc-querycap.xml
@@ -90,11 +90,13 @@ ambiguities.</entry>
<entry>__u8</entry>
<entry><structfield>bus_info</structfield>[32]</entry>
<entry>Location of the device in the system, a
-NUL-terminated ASCII string. For example: "PCI Slot 4". This
+NUL-terminated ASCII string. For example: "PCI:0000:05:06.0". This
information is intended for users, to distinguish multiple
-identical devices. If no such information is available the field may
-simply count the devices controlled by the driver, or contain the
-empty string (<structfield>bus_info</structfield>[0] = 0).<!-- XXX
pci_dev->slot_name example --></entry>
+identical devices. If no such information is available the field must
+simply count the devices controlled by the driver ("platform:vivi-000").
+The bus_info must start with "PCI:" for PCI boards, "PCIe:" for PCI Express
boards,
+"usb-" for USB devices, "I2C:" for i2c devices, "ISA:" for ISA devices,
+"parport" for parallel port devices and "platform:" for platform
devices.</entry>
</row>
<row>
<entry>__u32</entry>
--
1.7.10.4
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