€•ðLŒsphinx.addnodes”Œdocument”“”)”}”(Œ rawsource”Œ”Œchildren”]”(Œ translations”Œ LanguagesNode”“”)”}”(hhh]”(hŒ pending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ refdomain”Œstd”Œreftype”Œdoc”Œ reftarget”Œ?/translations/zh_CN/userspace-api/gpio/gpio-lineevent-data-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ?/translations/zh_TW/userspace-api/gpio/gpio-lineevent-data-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ?/translations/it_IT/userspace-api/gpio/gpio-lineevent-data-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ?/translations/ja_JP/userspace-api/gpio/gpio-lineevent-data-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ?/translations/ko_KR/userspace-api/gpio/gpio-lineevent-data-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒPortuguese (Brazilian)”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ?/translations/pt_BR/userspace-api/gpio/gpio-lineevent-data-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒSpanish”…””}”hh–sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ?/translations/sp_SP/userspace-api/gpio/gpio-lineevent-data-read”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h hhŒ _document”hŒsource”NŒline”NubhŒcomment”“”)”}”(hŒ SPDX-License-Identifier: GPL-2.0”h]”hŒ SPDX-License-Identifier: GPL-2.0”…””}”hh·sbah}”(h]”h ]”h"]”h$]”h&]”Œ xml:space”Œpreserve”uh1hµhhh²hh³ŒY/var/lib/git/docbuild/linux/Documentation/userspace-api/gpio/gpio-lineevent-data-read.rst”h´KubhŒtarget”“”)”}”(hŒ.. _GPIO_LINEEVENT_DATA_READ:”h]”h}”(h]”h ]”h"]”h$]”h&]”Œrefid”Œgpio-lineevent-data-read”uh1hÈh´Khhh²hh³hÇubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒGPIO_LINEEVENT_DATA_READ”h]”hŒGPIO_LINEEVENT_DATA_READ”…””}”(hhÝh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhhØh²hh³hÇh´KubhŒwarning”“”)”}”(hŒUThis ioctl is part of chardev_v1.rst and is obsoleted by gpio-v2-line-event-read.rst.”h]”hŒ paragraph”“”)”}”(hŒUThis ioctl is part of chardev_v1.rst and is obsoleted by gpio-v2-line-event-read.rst.”h]”hŒUThis ioctl is part of chardev_v1.rst and is obsoleted by gpio-v2-line-event-read.rst.”…””}”(hhóh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K hhíubah}”(h]”h ]”h"]”h$]”h&]”uh1hëhhØh²hh³hÇh´Nubh×)”}”(hhh]”(hÜ)”}”(hŒName”h]”hŒName”…””}”(hj h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhjh²hh³hÇh´Kubhò)”}”(hŒHGPIO_LINEEVENT_DATA_READ - Read edge detection events from a line event.”h]”hŒHGPIO_LINEEVENT_DATA_READ - Read edge detection events from a line event.”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´Khjh²hubeh}”(h]”Œname”ah ]”h"]”Œname”ah$]”h&]”uh1hÖhhØh²hh³hÇh´Kubh×)”}”(hhh]”(hÜ)”}”(hŒSynopsis”h]”hŒSynopsis”…””}”(hj1h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhj.h²hh³hÇh´Kubhò)”}”(hŒ3``int read(int event_fd, void *buf, size_t count)``”h]”hŒliteral”“”)”}”(hjAh]”hŒ/int read(int event_fd, void *buf, size_t count)”…””}”(hjEh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChj?ubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´Khj.h²hubeh}”(h]”Œsynopsis”ah ]”h"]”Œsynopsis”ah$]”h&]”uh1hÖhhØh²hh³hÇh´Kubh×)”}”(hhh]”(hÜ)”}”(hŒ Arguments”h]”hŒ Arguments”…””}”(hjch²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhj`h²hh³hÇh´KubhŒdefinition_list”“”)”}”(hhh]”(hŒdefinition_list_item”“”)”}”(hŒ›``event_fd`` The file descriptor of the GPIO character device, as returned in the :c:type:`request.fd` by gpio-get-lineevent-ioctl.rst. ”h]”(hŒterm”“”)”}”(hŒ ``event_fd``”h]”jD)”}”(hj€h]”hŒevent_fd”…””}”(hj‚h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChj~ubah}”(h]”h ]”h"]”h$]”h&]”uh1j|h³hÇh´KhjxubhŒ definition”“”)”}”(hhh]”hò)”}”(hŒThe file descriptor of the GPIO character device, as returned in the :c:type:`request.fd` by gpio-get-lineevent-ioctl.rst.”h]”(hŒEThe file descriptor of the GPIO character device, as returned in the ”…””}”(hjšh²hh³Nh´Nubh)”}”(hŒ':c:type:`request.fd`”h]”jD)”}”(hj¤h]”hŒ request.fd”…””}”(hj¦h²hh³Nh´Nubah}”(h]”h ]”(Œxref”Œc”Œc-type”eh"]”h$]”h&]”uh1jChj¢ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”Œ+userspace-api/gpio/gpio-lineevent-data-read”Œ refdomain”j±Œreftype”Œtype”Œ refexplicit”ˆŒrefwarn”‰Œ reftarget”Œgpioevent_request”uh1hh³hÇh´KhjšubhŒ! by gpio-get-lineevent-ioctl.rst.”…””}”(hjšh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´Khj—ubah}”(h]”h ]”h"]”h$]”h&]”uh1j•hjxubeh}”(h]”h ]”h"]”h$]”h&]”uh1jvh³hÇh´Khjsubjw)”}”(hŒD``buf`` The buffer to contain the :c:type:`events`. ”h]”(j})”}”(hŒ``buf``”h]”jD)”}”(hjáh]”hŒbuf”…””}”(hjãh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjßubah}”(h]”h ]”h"]”h$]”h&]”uh1j|h³hÇh´KhjÛubj–)”}”(hhh]”hò)”}”(hŒ;The buffer to contain the :c:type:`events`.”h]”(hŒThe buffer to contain the ”…””}”(hjùh²hh³Nh´Nubh)”}”(hŒ :c:type:`events`”h]”jD)”}”(hjh]”hŒevents”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”(j°j±Œc-type”eh"]”h$]”h&]”uh1jChjubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j½Œ refdomain”j±Œreftype”Œtype”Œ refexplicit”ˆŒrefwarn”‰jÃŒgpioevent_data”uh1hh³hÇh´KhjùubhŒ.”…””}”(hjùh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´Khjöubah}”(h]”h ]”h"]”h$]”h&]”uh1j•hjÛubeh}”(h]”h ]”h"]”h$]”h&]”uh1jvh³hÇh´Khjsh²hubjw)”}”(hŒs``count`` The number of bytes available in ``buf``, which must be at least the size of a :c:type:`gpioevent_data`. ”h]”(j})”}”(hŒ ``count``”h]”jD)”}”(hj<h]”hŒcount”…””}”(hj>h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChj:ubah}”(h]”h ]”h"]”h$]”h&]”uh1j|h³hÇh´K#hj6ubj–)”}”(hhh]”hò)”}”(hŒhThe number of bytes available in ``buf``, which must be at least the size of a :c:type:`gpioevent_data`.”h]”(hŒ!The number of bytes available in ”…””}”(hjTh²hh³Nh´NubjD)”}”(hŒ``buf``”h]”hŒbuf”…””}”(hj\h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjTubhŒ', which must be at least the size of a ”…””}”(hjTh²hh³Nh´Nubh)”}”(hŒ:c:type:`gpioevent_data`”h]”jD)”}”(hjph]”hŒgpioevent_data”…””}”(hjrh²hh³Nh´Nubah}”(h]”h ]”(j°j±Œc-type”eh"]”h$]”h&]”uh1jChjnubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j½Œ refdomain”j±Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jÃŒgpioevent_data”uh1hh³hÇh´K"hjTubhŒ.”…””}”(hjTh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K"hjQubah}”(h]”h ]”h"]”h$]”h&]”uh1j•hj6ubeh}”(h]”h ]”h"]”h$]”h&]”uh1jvh³hÇh´K#hjsh²hubeh}”(h]”h ]”h"]”h$]”h&]”uh1jqhj`h²hh³hÇh´Nubeh}”(h]”Œ arguments”ah ]”h"]”Œ arguments”ah$]”h&]”uh1hÖhhØh²hh³hÇh´Kubh×)”}”(hhh]”(hÜ)”}”(hŒ Description”h]”hŒ Description”…””}”(hj´h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhj±h²hh³hÇh´K&ubhò)”}”(hŒ8Read edge detection events for a line from a line event.”h]”hŒ8Read edge detection events for a line from a line event.”…””}”(hjÂh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K(hj±h²hubhò)”}”(hŒèEdge detection must be enabled for the input line using either ``GPIOEVENT_REQUEST_RISING_EDGE`` or ``GPIOEVENT_REQUEST_FALLING_EDGE``, or both. Edge events are then generated whenever edge interrupts are detected on the input line.”h]”(hŒ?Edge detection must be enabled for the input line using either ”…””}”(hjÐh²hh³Nh´NubjD)”}”(hŒ!``GPIOEVENT_REQUEST_RISING_EDGE``”h]”hŒGPIOEVENT_REQUEST_RISING_EDGE”…””}”(hjØh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjÐubhŒ or ”…””}”(hjÐh²hh³Nh´NubjD)”}”(hŒ"``GPIOEVENT_REQUEST_FALLING_EDGE``”h]”hŒGPIOEVENT_REQUEST_FALLING_EDGE”…””}”(hjêh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjÐubhŒb, or both. Edge events are then generated whenever edge interrupts are detected on the input line.”…””}”(hjÐh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K*hj±h²hubhò)”}”(hX2Edges are defined in terms of changes to the logical line value, so an inactive to active transition is a rising edge. If ``GPIOHANDLE_REQUEST_ACTIVE_LOW`` is set then logical polarity is the opposite of physical polarity, and ``GPIOEVENT_REQUEST_RISING_EDGE`` then corresponds to a falling physical edge.”h]”(hŒ{Edges are defined in terms of changes to the logical line value, so an inactive to active transition is a rising edge. If ”…””}”(hjh²hh³Nh´NubjD)”}”(hŒ!``GPIOHANDLE_REQUEST_ACTIVE_LOW``”h]”hŒGPIOHANDLE_REQUEST_ACTIVE_LOW”…””}”(hj h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjubhŒH is set then logical polarity is the opposite of physical polarity, and ”…””}”(hjh²hh³Nh´NubjD)”}”(hŒ!``GPIOEVENT_REQUEST_RISING_EDGE``”h]”hŒGPIOEVENT_REQUEST_RISING_EDGE”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjubhŒ- then corresponds to a falling physical edge.”…””}”(hjh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K/hj±h²hubhò)”}”(hŒ¿The kernel captures and timestamps edge events as close as possible to their occurrence and stores them in a buffer from where they can be read by userspace at its convenience using `read()`.”h]”(hŒ¶The kernel captures and timestamps edge events as close as possible to their occurrence and stores them in a buffer from where they can be read by userspace at its convenience using ”…””}”(hj4h²hh³Nh´NubhŒtitle_reference”“”)”}”(hŒ`read()`”h]”hŒread()”…””}”(hj>h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j<hj4ubhŒ.”…””}”(hj4h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K4hj±h²hubhò)”}”(hX`The source of the clock for :c:type:`event.timestamp` is ``CLOCK_MONOTONIC``, except for kernels earlier than Linux 5.7 when it was ``CLOCK_REALTIME``. There is no indication in the :c:type:`gpioevent_data` as to which clock source is used, it must be determined from either the kernel version or sanity checks on the timestamp itself.”h]”(hŒThe source of the clock for ”…””}”(hjVh²hh³Nh´Nubh)”}”(hŒ):c:type:`event.timestamp`”h]”jD)”}”(hj`h]”hŒevent.timestamp”…””}”(hjbh²hh³Nh´Nubah}”(h]”h ]”(j°j±Œc-type”eh"]”h$]”h&]”uh1jChj^ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j½Œ refdomain”j±Œreftype”Œtype”Œ refexplicit”ˆŒrefwarn”‰jÃŒgpioevent_data”uh1hh³hÇh´K8hjVubhŒ is ”…””}”(hjVh²hh³Nh´NubjD)”}”(hŒ``CLOCK_MONOTONIC``”h]”hŒCLOCK_MONOTONIC”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjVubhŒ8, except for kernels earlier than Linux 5.7 when it was ”…””}”(hjVh²hh³Nh´NubjD)”}”(hŒ``CLOCK_REALTIME``”h]”hŒCLOCK_REALTIME”…””}”(hj“h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjVubhŒ!. There is no indication in the ”…””}”(hjVh²hh³Nh´Nubh)”}”(hŒ:c:type:`gpioevent_data`”h]”jD)”}”(hj§h]”hŒgpioevent_data”…””}”(hj©h²hh³Nh´Nubah}”(h]”h ]”(j°j±Œc-type”eh"]”h$]”h&]”uh1jChj¥ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j½Œ refdomain”j±Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jÃŒgpioevent_data”uh1hh³hÇh´K8hjVubhŒ as to which clock source is used, it must be determined from either the kernel version or sanity checks on the timestamp itself.”…””}”(hjVh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K8hj±h²hubhò)”}”(hŒ_Events read from the buffer are always in the same order that they were detected by the kernel.”h]”hŒ_Events read from the buffer are always in the same order that they were detected by the kernel.”…””}”(hjÎh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´K>hj±h²hubhò)”}”(hŒ:The size of the kernel event buffer is fixed at 16 events.”h]”hŒ:The size of the kernel event buffer is fixed at 16 events.”…””}”(hjÜh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´KAhj±h²hubhò)”}”(hŒÅThe buffer may overflow if bursts of events occur quicker than they are read by userspace. If an overflow occurs then the most recent event is discarded. Overflow cannot be detected from userspace.”h]”hŒÅThe buffer may overflow if bursts of events occur quicker than they are read by userspace. If an overflow occurs then the most recent event is discarded. Overflow cannot be detected from userspace.”…””}”(hjêh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´KChj±h²hubhò)”}”(hXTo minimize the number of calls required to copy events from the kernel to userspace, `read()` supports copying multiple events. The number of events copied is the lower of the number available in the kernel buffer and the number that will fit in the userspace buffer (``buf``).”h]”(hŒVTo minimize the number of calls required to copy events from the kernel to userspace, ”…””}”(hjøh²hh³Nh´Nubj=)”}”(hŒ`read()`”h]”hŒread()”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j<hjøubhŒ¯ supports copying multiple events. The number of events copied is the lower of the number available in the kernel buffer and the number that will fit in the userspace buffer (”…””}”(hjøh²hh³Nh´NubjD)”}”(hŒ``buf``”h]”hŒbuf”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjøubhŒ).”…””}”(hjøh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´KGhj±h²hubhò)”}”(hŒfThe `read()` will block if no event is available and the ``event_fd`` has not been set **O_NONBLOCK**.”h]”(hŒThe ”…””}”(hj*h²hh³Nh´Nubj=)”}”(hŒ`read()`”h]”hŒread()”…””}”(hj2h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j<hj*ubhŒ- will block if no event is available and the ”…””}”(hj*h²hh³Nh´NubjD)”}”(hŒ ``event_fd``”h]”hŒevent_fd”…””}”(hjDh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChj*ubhŒ has not been set ”…””}”(hj*h²hh³Nh´NubhŒstrong”“”)”}”(hŒ**O_NONBLOCK**”h]”hŒ O_NONBLOCK”…””}”(hjXh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jVhj*ubhŒ.”…””}”(hj*h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´KLhj±h²hubhò)”}”(hŒyThe presence of an event can be tested for by checking that the ``event_fd`` is readable using `poll()` or an equivalent.”h]”(hŒ@The presence of an event can be tested for by checking that the ”…””}”(hjph²hh³Nh´NubjD)”}”(hŒ ``event_fd``”h]”hŒevent_fd”…””}”(hjxh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjpubhŒ is readable using ”…””}”(hjph²hh³Nh´Nubj=)”}”(hŒ`poll()`”h]”hŒpoll()”…””}”(hjŠh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j<hjpubhŒ or an equivalent.”…””}”(hjph²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´KOhj±h²hubeh}”(h]”Œ description”ah ]”h"]”Œ description”ah$]”h&]”uh1hÖhhØh²hh³hÇh´K&ubh×)”}”(hhh]”(hÜ)”}”(hŒ Return Value”h]”hŒ Return Value”…””}”(hj­h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhjªh²hh³hÇh´KSubhò)”}”(hŒsOn success the number of bytes read, which will be a multiple of the size of a :c:type:`gpio_lineevent_data` event.”h]”(hŒOOn success the number of bytes read, which will be a multiple of the size of a ”…””}”(hj»h²hh³Nh´Nubh)”}”(hŒ:c:type:`gpio_lineevent_data`”h]”jD)”}”(hjÅh]”hŒgpio_lineevent_data”…””}”(hjÇh²hh³Nh´Nubah}”(h]”h ]”(j°j±Œc-type”eh"]”h$]”h&]”uh1jChjÃubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j½Œ refdomain”j±Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jÃŒgpio_lineevent_data”uh1hh³hÇh´KUhj»ubhŒ event.”…””}”(hj»h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hñh³hÇh´KUhjªh²hubhò)”}”(hŒqOn error -1 and the ``errno`` variable is set appropriately. Common error codes are described in error-codes.rst.”h]”(hŒOn error -1 and the ”…””}”(hjìh²hh³Nh´NubjD)”}”(hŒ ``errno``”h]”hŒerrno”…””}”(hjôh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jChjìubhŒT variable is set appropriately. 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