vsphinx.addnodesdocument)}( rawsourcechildren]( translations LanguagesNode)}(hhh](h pending_xref)}(hhh]docutils.nodesTextChinese (Simplified)}parenthsba attributes}(ids]classes]names]dupnames]backrefs] refdomainstdreftypedoc reftarget=/translations/zh_CN/userspace-api/gpio/gpio-v2-get-line-ioctlmodnameN classnameN refexplicitutagnamehhh ubh)}(hhh]hChinese (Traditional)}hh2sbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget=/translations/zh_TW/userspace-api/gpio/gpio-v2-get-line-ioctlmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hItalian}hhFsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget=/translations/it_IT/userspace-api/gpio/gpio-v2-get-line-ioctlmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hJapanese}hhZsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget=/translations/ja_JP/userspace-api/gpio/gpio-v2-get-line-ioctlmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hKorean}hhnsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget=/translations/ko_KR/userspace-api/gpio/gpio-v2-get-line-ioctlmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hSpanish}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget=/translations/sp_SP/userspace-api/gpio/gpio-v2-get-line-ioctlmodnameN classnameN refexplicituh1hhh ubeh}(h]h ]h"]h$]h&]current_languageEnglishuh1h hh _documenthsourceNlineNubhcomment)}(h SPDX-License-Identifier: GPL-2.0h]h SPDX-License-Identifier: GPL-2.0}hhsbah}(h]h ]h"]h$]h&] xml:spacepreserveuh1hhhhhhW/var/lib/git/docbuild/linux/Documentation/userspace-api/gpio/gpio-v2-get-line-ioctl.rsthKubhtarget)}(h.. _GPIO_V2_GET_LINE_IOCTL:h]h}(h]h ]h"]h$]h&]refidgpio-v2-get-line-ioctluh1hhKhhhhhhubhsection)}(hhh](htitle)}(hGPIO_V2_GET_LINE_IOCTLh]hGPIO_V2_GET_LINE_IOCTL}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(hNameh]hName}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhhhK ubh paragraph)}(hAGPIO_V2_GET_LINE_IOCTL - Request a line or lines from the kernel.h]hAGPIO_V2_GET_LINE_IOCTL - Request a line or lines from the kernel.}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK hhhhubeh}(h]nameah ]h"]nameah$]h&]uh1hhhhhhhhK ubh)}(hhh](h)}(hSynopsish]hSynopsis}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKubhindex)}(hhh]h}(h]h ]h"]h$]h&]entries](single GPIO_V2_GET_LINE_IOCTL (C macro)c.GPIO_V2_GET_LINE_IOCTLhNtauh1jhjhhhNhNubhdesc)}(hhh](hdesc_signature)}(hGPIO_V2_GET_LINE_IOCTLh]hdesc_signature_line)}(hGPIO_V2_GET_LINE_IOCTLh]h desc_name)}(hGPIO_V2_GET_LINE_IOCTLh]h desc_sig_name)}(hj+h]hGPIO_V2_GET_LINE_IOCTL}(hj;hhhNhNubah}(h]h ]nah"]h$]h&]uh1j9hj5ubah}(h]h ](sig-namedescnameeh"]h$]h&]hhuh1j3hj/hhhhhKubah}(h]h ]h"]h$]h&]hh add_permalinkuh1j-sphinx_line_type declaratorhj)hhhhhKubah}(h]j ah ](sig sig-objecteh"]h$]h&] is_multiline _toc_parts) _toc_namehuh1j'hhhKhj$hhubh desc_content)}(hhh]h}(h]h ]h"]h$]h&]uh1jehj$hhhhhKubeh}(h]h ](cmacroeh"]h$]h&]domainjsobjtypejtdesctypejtnoindex noindexentrynocontentsentryuh1j"hhhjhNhNubh)}(hX``int ioctl(int chip_fd, GPIO_V2_GET_LINE_IOCTL, struct gpio_v2_line_request *request)``h]hliteral)}(hjh]hTint ioctl(int chip_fd, GPIO_V2_GET_LINE_IOCTL, struct gpio_v2_line_request *request)}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhj~ubah}(h]h ]h"]h$]h&]uh1hhhhKhjhhubeh}(h]synopsisah ]h"]synopsisah$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(h Argumentsh]h Arguments}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKubhdefinition_list)}(hhh](hdefinition_list_item)}(hS``chip_fd`` The file descriptor of the GPIO character device returned by `open()`. h](hterm)}(h ``chip_fd``h]j)}(hjh]hchip_fd}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubah}(h]h ]h"]h$]h&]uh1jhhhKhjubh definition)}(hhh]h)}(hFThe file descriptor of the GPIO character device returned by `open()`.h](h=The file descriptor of the GPIO character device returned by }(hjhhhNhNubhtitle_reference)}(h`open()`h]hopen()}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhhhKhjubj)}(hv``request`` The :c:type:`line_request` specifying the lines to request and their configuration. h](j)}(h ``request``h]j)}(hj h]hrequest}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubah}(h]h ]h"]h$]h&]uh1jhhhKhjubj)}(hhh]h)}(hiThe :c:type:`line_request` specifying the lines to request and their configuration.h](hThe }(hj%hhhNhNubh)}(h,:c:type:`line_request`h]j)}(hj/h]h line_request}(hj1hhhNhNubah}(h]h ](xrefjsc-typeeh"]h$]h&]uh1jhj-ubah}(h]h ]h"]h$]h&]refdoc)userspace-api/gpio/gpio-v2-get-line-ioctl refdomainjsreftypetype refexplicitrefwarn c:parent_keysphinx.domains.c LookupKey)}data]sb reftargetgpio_v2_line_requestuh1hhhhKhj%ubh9 specifying the lines to request and their configuration.}(hj%hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhj"ubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhhhKhjhhubeh}(h]h ]h"]h$]h&]uh1jhjhhhhhNubeh}(h] argumentsah ]h"] argumentsah$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(h Descriptionh]h Description}(hj~hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj{hhhhhK ubh)}(hOn success, the requesting process is granted exclusive access to the line value, write access to the line configuration, and may receive events when edges are detected on the line, all of which are described in more detail in :ref:`gpio-v2-line-request`.h](hOn success, the requesting process is granted exclusive access to the line value, write access to the line configuration, and may receive events when edges are detected on the line, all of which are described in more detail in }(hjhhhNhNubh)}(h:ref:`gpio-v2-line-request`h]hinline)}(hjh]hgpio-v2-line-request}(hjhhhNhNubah}(h]h ](j;stdstd-refeh"]h$]h&]uh1jhjubah}(h]h ]h"]h$]h&]refdocjG refdomainjreftyperef refexplicitrefwarnjUgpio-v2-line-requestuh1hhhhK"hjubh.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK"hj{hhubh)}(hA number of lines may be requested in the one line request, and request operations are performed on the requested lines by the kernel as atomically as possible. e.g. gpio-v2-line-get-values-ioctl.rst will read all the requested lines at once.h]hA number of lines may be requested in the one line request, and request operations are performed on the requested lines by the kernel as atomically as possible. e.g. gpio-v2-line-get-values-ioctl.rst will read all the requested lines at once.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK'hj{hhubh)}(hX The state of a line, including the value of output lines, is guaranteed to remain as requested until the returned file descriptor is closed. Once the file descriptor is closed, the state of the line becomes uncontrolled from the userspace perspective, and may revert to its default state.h]hX The state of a line, including the value of output lines, is guaranteed to remain as requested until the returned file descriptor is closed. Once the file descriptor is closed, the state of the line becomes uncontrolled from the userspace perspective, and may revert to its default state.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK,hj{hhubh)}(h9Requesting a line already in use is an error (**EBUSY**).h](h.Requesting a line already in use is an error (}(hjhhhNhNubhstrong)}(h **EBUSY**h]hEBUSY}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh).}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK1hj{hhubh)}(h@Closing the ``chip_fd`` has no effect on existing line requests.h](h Closing the }(hjhhhNhNubj)}(h ``chip_fd``h]hchip_fd}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh) has no effect on existing line requests.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK3hj{hhubh)}(h".. _gpio-v2-get-line-config-rules:h]h}(h]h ]h"]h$]h&]hgpio-v2-get-line-config-rulesuh1hhK5hj{hhhhubh)}(hhh](h)}(hConfiguration Rulesh]hConfiguration Rules}(hj,hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj)hhhhhK8ubh)}(hFFor any given requested line, the following configuration rules apply:h]hFFor any given requested line, the following configuration rules apply:}(hj:hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK:hj)hhubh)}(hX:The direction flags, ``GPIO_V2_LINE_FLAG_INPUT`` and ``GPIO_V2_LINE_FLAG_OUTPUT``, cannot be combined. If neither are set then the only other flag that may be set is ``GPIO_V2_LINE_FLAG_ACTIVE_LOW`` and the line is requested "as-is" to allow reading of the line value without altering the electrical configuration.h](hThe direction flags, }(hjHhhhNhNubj)}(h``GPIO_V2_LINE_FLAG_INPUT``h]hGPIO_V2_LINE_FLAG_INPUT}(hjPhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjHubh and }(hjHhhhNhNubj)}(h``GPIO_V2_LINE_FLAG_OUTPUT``h]hGPIO_V2_LINE_FLAG_OUTPUT}(hjbhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjHubhU, cannot be combined. If neither are set then the only other flag that may be set is }(hjHhhhNhNubj)}(h ``GPIO_V2_LINE_FLAG_ACTIVE_LOW``h]hGPIO_V2_LINE_FLAG_ACTIVE_LOW}(hjthhhNhNubah}(h]h ]h"]h$]h&]uh1jhjHubhx and the line is requested “as-is” to allow reading of the line value without altering the electrical configuration.}(hjHhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK` attribute may only be applied to lines with ``GPIO_V2_LINE_FLAG_INPUT`` set. When set, debounce applies to both the values returned by gpio-v2-line-get-values-ioctl.rst and the edges returned by gpio-v2-line-event-read.rst. If not supported directly by hardware, debouncing is emulated in software by the kernel. Requesting debounce on a line that supports neither debounce in hardware nor interrupts, as required for software emulation, is an error (**ENXIO**).h](hThe }(hjhhhNhNubh)}(h4:c:type:`debounce_period_us`h]j)}(hjh]hdebounce_period_us}(hjhhhNhNubah}(h]h ](j;jsc-typeeh"]h$]h&]uh1jhjubah}(h]h ]h"]h$]h&]refdocjG refdomainjsreftypetype refexplicitrefwarnjMjQjUgpio_v2_line_attributeuh1hhhhKVhjubh- attribute may only be applied to lines with }(hjhhhNhNubj)}(h``GPIO_V2_LINE_FLAG_INPUT``h]hGPIO_V2_LINE_FLAG_INPUT}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubhX~ set. When set, debounce applies to both the values returned by gpio-v2-line-get-values-ioctl.rst and the edges returned by gpio-v2-line-event-read.rst. If not supported directly by hardware, debouncing is emulated in software by the kernel. Requesting debounce on a line that supports neither debounce in hardware nor interrupts, as required for software emulation, is an error (}(hjhhhNhNubj)}(h **ENXIO**h]hENXIO}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh).}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKVhj)hhubh)}(h=Requesting an invalid configuration is an error (**EINVAL**).h](h1Requesting an invalid configuration is an error (}(hjhhhNhNubj)}(h **EINVAL**h]hEINVAL}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh).}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK_hj)hhubh)}(h$.. _gpio-v2-get-line-config-support:h]h}(h]h ]h"]h$]h&]hgpio-v2-get-line-config-supportuh1hhKahj)hhhhubeh}(h](configuration-rulesj(eh ]h"](configuration rulesgpio-v2-get-line-config-ruleseh$]h&]uh1hhj{hhhhhK8expect_referenced_by_name}jjsexpect_referenced_by_id}j(jsubh)}(hhh](h)}(hConfiguration Supporth]hConfiguration Support}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKdubh)}(hWhere the requested configuration is not directly supported by the underlying hardware and driver, the kernel applies one of these approaches:h]hWhere the requested configuration is not directly supported by the underlying hardware and driver, the kernel applies one of these approaches:}(hj(hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKfhjhhubh block_quote)}(hZ- reject the request - emulate the feature in software - treat the feature as best effort h]h bullet_list)}(hhh](h list_item)}(hreject the requesth]h)}(hjEh]hreject the request}(hjGhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKihjCubah}(h]h ]h"]h$]h&]uh1jAhj>ubjB)}(hemulate the feature in softwareh]h)}(hj\h]hemulate the feature in software}(hj^hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKjhjZubah}(h]h ]h"]h$]h&]uh1jAhj>ubjB)}(h!treat the feature as best effort h]h)}(h treat the feature as best efforth]h treat the feature as best effort}(hjuhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKkhjqubah}(h]h ]h"]h$]h&]uh1jAhj>ubeh}(h]h ]h"]h$]h&]bullet-uh1j<hhhKihj8ubah}(h]h ]h"]h$]h&]uh1j6hhhKihjhhubh)}(hThe approach applied depends on whether the feature can reasonably be emulated in software, and the impact on the hardware and userspace if the feature is not supported. The approach applied for each feature is as follows:h]hThe approach applied depends on whether the feature can reasonably be emulated in software, and the impact on the hardware and userspace if the feature is not supported. The approach applied for each feature is as follows:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKmhjhhubhtable)}(hhh]htgroup)}(hhh](hcolspec)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]colwidthK uh1jhjubhthead)}(hhh]hrow)}(hhh](hentry)}(hhh]h)}(hFeatureh]hFeature}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKshjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hApproachh]hApproach}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKshjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjubah}(h]h ]h"]h$]h&]uh1jhjubhtbody)}(hhh](j)}(hhh](j)}(hhh]h)}(hBiash]hBias}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKuhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(h best efforth]h best effort}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKuhj*ubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh](j)}(hhh]h)}(hDebounceh]hDebounce}(hjMhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKvhjJubah}(h]h ]h"]h$]h&]uh1jhjGubj)}(hhh]h)}(hemulateh]hemulate}(hjdhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKvhjaubah}(h]h ]h"]h$]h&]uh1jhjGubeh}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh](j)}(hhh]h)}(h Directionh]h Direction}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKwhjubah}(h]h ]h"]h$]h&]uh1jhj~ubj)}(hhh]h)}(hrejecth]hreject}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKwhjubah}(h]h ]h"]h$]h&]uh1jhj~ubeh}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh](j)}(hhh]h)}(hDriveh]hDrive}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKxhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hemulateh]hemulate}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKxhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj ubj)}(hhh](j)}(hhh]h)}(hEdge Detectionh]hEdge Detection}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKyhjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hhh]h)}(hrejecth]hreject}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKyhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj ubeh}(h]h ]h"]h$]h&]uh1j hjubeh}(h]h ]h"]h$]h&]colsKuh1jhjubah}(h]h ]h"]h$]h&]uh1jhjhhhhhNubh)}(hBias is treated as best effort to allow userspace to apply the same configuration for platforms that support internal bias as those that require external bias. Worst case the line floats rather than being biased as expected.h]hBias is treated as best effort to allow userspace to apply the same configuration for platforms that support internal bias as those that require external bias. Worst case the line floats rather than being biased as expected.}(hj6hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK|hjhhubh)}(hDebounce is emulated by applying a filter to hardware interrupts on the line. An edge event is generated after an edge is detected and the line remains stable for the debounce period. The event timestamp corresponds to the end of the debounce period.h]hDebounce is emulated by applying a filter to hardware interrupts on the line. An edge event is generated after an edge is detected and the line remains stable for the debounce period. The event timestamp corresponds to the end of the debounce period.}(hjDhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjhhubh)}(h`Drive is emulated by switching the line to an input when the line should not be actively driven.h]h`Drive is emulated by switching the line to an input when the line should not be actively driven.}(hjRhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjhhubh)}(hEdge detection requires interrupt support, and is rejected if that is not supported. Emulation by polling can still be performed from userspace.h]hEdge detection requires interrupt support, and is rejected if that is not supported. Emulation by polling can still be performed from userspace.}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjhhubh)}(hIn all cases, the configuration reported by gpio-v2-get-lineinfo-ioctl.rst is the requested configuration, not the resulting hardware configuration. Userspace cannot determine if a feature is supported in hardware, is emulated, or is best effort.h]hIn all cases, the configuration reported by gpio-v2-get-lineinfo-ioctl.rst is the requested configuration, not the resulting hardware configuration. Userspace cannot determine if a feature is supported in hardware, is emulated, or is best effort.}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjhhubeh}(h](configuration-supportj eh ]h"](configuration supportgpio-v2-get-line-config-supporteh$]h&]uh1hhj{hhhhhKdj}jjsj}j jsubeh}(h] descriptionah ]h"] descriptionah$]h&]uh1hhhhhhhhK ubh)}(hhh](h)}(h Return Valueh]h Return Value}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKubh)}(hmOn success 0 and the :c:type:`request.fd` contains the file descriptor for the request.h](hOn success 0 and the }(hjhhhNhNubh)}(h*:c:type:`request.fd`h]j)}(hjh]h request.fd}(hjhhhNhNubah}(h]h ](j;jsc-typeeh"]h$]h&]uh1jhjubah}(h]h ]h"]h$]h&]refdocjG refdomainjsreftypetype refexplicitrefwarnjMjQjUgpio_v2_line_requestuh1hhhhKhjubh. contains the file descriptor for the request.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhjhhubh)}(hqOn error -1 and the ``errno`` variable is set appropriately. Common error codes are described in error-codes.rst.h](hOn error -1 and the }(hjhhhNhNubj)}(h ``errno``h]herrno}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubhT variable is set appropriately. 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