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[media] DocBook: bus_info can no longer be empty

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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.verkuil@cisco.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-09-14 06:14:16 -03:00 committed by Mauro Carvalho Chehab
parent 93828d6438
commit cd56c8dd50
1 changed files with 6 additions and 4 deletions
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10
Documentation/DocBook/media/v4l/vidioc-querycap.xml
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@ -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>