mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
c2b66cafdf
Shorten the tables by removing row numbers in comments, allowing for
later insertion of rows with minimal diffs.
All changes have been generated by the following script.
import io
import re
import sys
def process_table(fname, data):
if fname.endswith('hist-v4l2.rst'):
data = re.sub(u'\n{1,2}\t( ?) -( ?) ?', u'\n\t\\1 -\\2', data, flags = re.MULTILINE)
data = re.sub(u'\n(\t| )- \.\. row [0-9]+\n\t ?-( ?) ?', u'\\1* -\\2', data, flags = re.MULTILINE)
else:
data = re.sub(u'\n{1,2} -( ?) ?', u'\n -\\1', data, flags = re.MULTILINE)
data = re.sub(u'(\n?)(\n\n - \.\. row 1\n)', u'\n\\2', data, flags = re.MULTILINE)
data = re.sub(u'\n - \.\. row [0-9]+\n -( ?) ?', u' * -\\1', data, flags = re.MULTILINE)
data = re.sub(u'\n - \.\. row [0-9]+\n \.\. (_[A-Z0-9_`-]*:)', u'\n - .. \\1', data, flags = re.MULTILINE)
data = re.sub(u'\n - \.\. (_[A-Z0-9_`-]*:)\n -', u' * .. \\1\n\n -', data, flags = re.MULTILINE)
data = re.sub(u'^ - ', u' -', data, flags = re.MULTILINE)
data = re.sub(u'^(\t{1,2}) ', u'\\1', data, flags = re.MULTILINE)
return data
def process_file(fname, data):
buf = io.StringIO(data)
output = ''
in_table = False
table_separator = 0
for line in buf.readlines():
if line.find('.. flat-table::') != -1:
in_table = True
table = ''
elif in_table and not re.match('^[\t\n]|( )', line):
in_table = False
output += process_table(fname, table)
if in_table:
table += line
else:
output += line
if in_table:
in_table = False
output += process_table(fname, table)
return output
fname = sys.argv[1]
data = file(fname, 'rb').read().decode('utf-8')
data = process_file(fname, data)
file(fname, 'wb').write(data.encode('utf-8'))
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
116 lines
3.2 KiB
ReStructuredText
116 lines
3.2 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _VIDIOC_SUBSCRIBE_EVENT:
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.. _VIDIOC_UNSUBSCRIBE_EVENT:
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******************************************************
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ioctl VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT
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******************************************************
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Name
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====
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VIDIOC_SUBSCRIBE_EVENT - VIDIOC_UNSUBSCRIBE_EVENT - Subscribe or unsubscribe event
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Synopsis
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========
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.. c:function:: int ioctl( int fd, VIDIOC_SUBSCRIBE_EVENT, struct v4l2_event_subscription *argp )
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:name: VIDIOC_SUBSCRIBE_EVENT
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.. c:function:: int ioctl( int fd, VIDIOC_UNSUBSCRIBE_EVENT, struct v4l2_event_subscription *argp )
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:name: VIDIOC_UNSUBSCRIBE_EVENT
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Arguments
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=========
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``fd``
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File descriptor returned by :ref:`open() <func-open>`.
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``argp``
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Description
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===========
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Subscribe or unsubscribe V4L2 event. Subscribed events are dequeued by
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using the :ref:`VIDIOC_DQEVENT` ioctl.
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.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
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.. c:type:: v4l2_event_subscription
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.. flat-table:: struct v4l2_event_subscription
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:header-rows: 0
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:stub-columns: 0
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:widths: 1 1 2
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* - __u32
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- ``type``
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- Type of the event, see :ref:`event-type`.
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.. note::
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``V4L2_EVENT_ALL`` can be used with
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:ref:`VIDIOC_UNSUBSCRIBE_EVENT <VIDIOC_SUBSCRIBE_EVENT>` for
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unsubscribing all events at once.
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* - __u32
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- ``id``
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- ID of the event source. If there is no ID associated with the
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event source, then set this to 0. Whether or not an event needs an
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ID depends on the event type.
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* - __u32
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- ``flags``
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- Event flags, see :ref:`event-flags`.
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* - __u32
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- ``reserved``\ [5]
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- Reserved for future extensions. Drivers and applications must set
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the array to zero.
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.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
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.. _event-flags:
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.. flat-table:: Event Flags
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:header-rows: 0
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:stub-columns: 0
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:widths: 3 1 4
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* - ``V4L2_EVENT_SUB_FL_SEND_INITIAL``
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- 0x0001
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- When this event is subscribed an initial event will be sent
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containing the current status. This only makes sense for events
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that are triggered by a status change such as ``V4L2_EVENT_CTRL``.
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Other events will ignore this flag.
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* - ``V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK``
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- 0x0002
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- If set, then events directly caused by an ioctl will also be sent
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to the filehandle that called that ioctl. For example, changing a
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control using :ref:`VIDIOC_S_CTRL <VIDIOC_G_CTRL>` will cause
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a V4L2_EVENT_CTRL to be sent back to that same filehandle.
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Normally such events are suppressed to prevent feedback loops
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where an application changes a control to a one value and then
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another, and then receives an event telling it that that control
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has changed to the first value.
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Since it can't tell whether that event was caused by another
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application or by the :ref:`VIDIOC_S_CTRL <VIDIOC_G_CTRL>`
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call it is hard to decide whether to set the control to the value
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in the event, or ignore it.
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Think carefully when you set this flag so you won't get into
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situations like that.
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Return Value
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============
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On success 0 is returned, on error -1 and the ``errno`` variable is set
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appropriately. The generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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