ysphinx.addnodesdocument)}( rawsourcechildren]( translations LanguagesNode)}(hhh](h pending_xref)}(hhh]docutils.nodesTextChinese (Simplified)}parenthsba attributes}(ids]classes]names]dupnames]backrefs] refdomainstdreftypedoc reftarget2/translations/zh_CN/driver-api/media/camera-sensormodnameN classnameN refexplicitutagnamehhh ubh)}(hhh]hChinese (Traditional)}hh2sbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget2/translations/zh_TW/driver-api/media/camera-sensormodnameN classnameN refexplicituh1hhh ubh)}(hhh]hItalian}hhFsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget2/translations/it_IT/driver-api/media/camera-sensormodnameN classnameN refexplicituh1hhh ubh)}(hhh]hJapanese}hhZsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget2/translations/ja_JP/driver-api/media/camera-sensormodnameN classnameN refexplicituh1hhh ubh)}(hhh]hKorean}hhnsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget2/translations/ko_KR/driver-api/media/camera-sensormodnameN classnameN refexplicituh1hhh ubh)}(hhh]hSpanish}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget2/translations/sp_SP/driver-api/media/camera-sensormodnameN classnameN refexplicituh1hhh ubeh}(h]h ]h"]h$]h&]current_languageEnglishuh1h hh _documenthsourceNlineNubhcomment)}(h SPDX-License-Identifier: GPL-2.0h]h SPDX-License-Identifier: GPL-2.0}hhsbah}(h]h ]h"]h$]h&] xml:spacepreserveuh1hhhhhhL/var/lib/git/docbuild/linux/Documentation/driver-api/media/camera-sensor.rsthKubhtarget)}(h(.. _media_writing_camera_sensor_drivers:h]h}(h]h ]h"]h$]h&]refid#media-writing-camera-sensor-driversuh1hhKhhhhhhubhsection)}(hhh](htitle)}(hWriting camera sensor driversh]hWriting camera sensor drivers}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhhhKubh paragraph)}(hThis document covers the in-kernel APIs only. For the best practices on userspace API implementation in camera sensor drivers, please see :ref:`media_using_camera_sensor_drivers`.h](hThis document covers the in-kernel APIs only. For the best practices on userspace API implementation in camera sensor drivers, please see }(hhhhhNhNubh)}(h(:ref:`media_using_camera_sensor_drivers`h]hinline)}(hhh]h!media_using_camera_sensor_drivers}(hhhhhNhNubah}(h]h ](xrefstdstd-refeh"]h$]h&]uh1hhhubah}(h]h ]h"]h$]h&]refdocdriver-api/media/camera-sensor refdomainhreftyperef refexplicitrefwarn reftarget!media_using_camera_sensor_driversuh1hhhhKhhubh.}(hhhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubh)}(hhh](h)}(h CSI-2, parallel and BT.656 busesh]h CSI-2, parallel and BT.656 buses}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhK ubh)}(h'Please see :ref:`transmitter-receiver`.h](h Please see }(hj!hhhNhNubh)}(h:ref:`transmitter-receiver`h]h)}(hj+h]htransmitter-receiver}(hj-hhhNhNubah}(h]h ](hstdstd-refeh"]h$]h&]uh1hhj)ubah}(h]h ]h"]h$]h&]refdoch refdomainj7reftyperef refexplicitrefwarnjtransmitter-receiveruh1hhhhKhj!ubh.}(hj!hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhjhhubeh}(h]csi-2-parallel-and-bt-656-busesah ]h"] csi-2, parallel and bt.656 busesah$]h&]uh1hhhhhhhhK ubh)}(hhh](h)}(hHandling clocksh]hHandling clocks}(hj^hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj[hhhhhKubh)}(hXCamera sensors have an internal clock tree including a PLL and a number of divisors. The clock tree is generally configured by the driver based on a few input parameters that are specific to the hardware: the external clock frequency and the link frequency. The two parameters generally are obtained from system firmware. **No other frequencies should be used in any circumstances.**h](hXBCamera sensors have an internal clock tree including a PLL and a number of divisors. The clock tree is generally configured by the driver based on a few input parameters that are specific to the hardware: the external clock frequency and the link frequency. The two parameters generally are obtained from system firmware. }(hjlhhhNhNubhstrong)}(h=**No other frequencies should be used in any circumstances.**h]h9No other frequencies should be used in any circumstances.}(hjvhhhNhNubah}(h]h ]h"]h$]h&]uh1jthjlubeh}(h]h ]h"]h$]h&]uh1hhhhKhj[hhubh)}(hX:The reason why the clock frequencies are so important is that the clock signals come out of the SoC, and in many cases a specific frequency is designed to be used in the system. Using another frequency may cause harmful effects elsewhere. Therefore only the pre-determined frequencies are configurable by the user.h]hX:The reason why the clock frequencies are so important is that the clock signals come out of the SoC, and in many cases a specific frequency is designed to be used in the system. Using another frequency may cause harmful effects elsewhere. Therefore only the pre-determined frequencies are configurable by the user.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj[hhubh)}(hhh](h)}(hACPIh]hACPI}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhK!ubh)}(huRead the ``clock-frequency`` _DSD property to denote the frequency. The driver can rely on this frequency being used.h](h Read the }(hjhhhNhNubhliteral)}(h``clock-frequency``h]hclock-frequency}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubhY _DSD property to denote the frequency. The driver can rely on this frequency being used.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK#hjhhubeh}(h]acpiah ]h"]acpiah$]h&]uh1hhj[hhhhhK!ubh)}(hhh](h)}(h Devicetreeh]h Devicetree}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhK'ubh)}(hXVThe preferred way to achieve this is using ``assigned-clocks``, ``assigned-clock-parents`` and ``assigned-clock-rates`` properties. See the `clock device tree bindings `_ for more information. The driver then gets the frequency using ``clk_get_rate()``.h](h+The preferred way to achieve this is using }(hjhhhNhNubj)}(h``assigned-clocks``h]hassigned-clocks}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh, }(hjhhhNhNubj)}(h``assigned-clock-parents``h]hassigned-clock-parents}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh and }(hjhhhNhNubj)}(h``assigned-clock-rates``h]hassigned-clock-rates}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh properties. See the }(hjhhhNhNubh reference)}(hw`clock device tree bindings `_h]hclock device tree bindings}(hj$hhhNhNubah}(h]h ]h"]h$]h&]nameclock device tree bindingsrefuriWhttps://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/clock/clock.yamluh1j"hjubh)}(hZ h]h}(h]clock-device-tree-bindingsah ]h"]clock device tree bindingsah$]h&]refurij5uh1h referencedKhjubh@ for more information. The driver then gets the frequency using }(hjhhhNhNubj)}(h``clk_get_rate()``h]hclk_get_rate()}(hjHhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK)hjhhubh)}(hXThis approach has the drawback that there's no guarantee that the frequency hasn't been modified directly or indirectly by another driver, or supported by the board's clock tree to begin with. Changes to the Common Clock Framework API are required to ensure reliability.h]hXThis approach has the drawback that there’s no guarantee that the frequency hasn’t been modified directly or indirectly by another driver, or supported by the board’s clock tree to begin with. Changes to the Common Clock Framework API are required to ensure reliability.}(hj`hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK0hjhhubeh}(h] devicetreeah ]h"] devicetreeah$]h&]uh1hhj[hhhhhK'ubeh}(h]handling-clocksah ]h"]handling clocksah$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(hPower managementh]hPower management}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhj~hhhhhK6ubh)}(hCamera sensors are used in conjunction with other devices to form a camera pipeline. They must obey the rules listed herein to ensure coherent power management over the pipeline.h]hCamera sensors are used in conjunction with other devices to form a camera pipeline. They must obey the rules listed herein to ensure coherent power management over the pipeline.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK8hj~hhubh)}(hXkCamera sensor drivers are responsible for controlling the power state of the device they otherwise control as well. They shall use runtime PM to manage power states. Runtime PM shall be enabled at probe time and disabled at remove time. Drivers should enable runtime PM autosuspend. Also see :ref:`async sub-device registration `.h](hX$Camera sensor drivers are responsible for controlling the power state of the device they otherwise control as well. They shall use runtime PM to manage power states. Runtime PM shall be enabled at probe time and disabled at remove time. Drivers should enable runtime PM autosuspend. Also see }(hjhhhNhNubh)}(hF:ref:`async sub-device registration `h]h)}(hjh]hasync sub-device registration}(hjhhhNhNubah}(h]h ](hstdstd-refeh"]h$]h&]uh1hhjubah}(h]h ]h"]h$]h&]refdoch refdomainjreftyperef refexplicitrefwarnjmedia-registering-async-subdevsuh1hhhhK`.h](hPlease also see }(hjhhhNhNubh)}(h.:ref:`examples `h]h)}(hjh]hexamples}(hjhhhNhNubah}(h]h ](hstdstd-refeh"]h$]h&]uh1hhjubah}(h]h ]h"]h$]h&]refdoch refdomainjreftyperef refexplicitrefwarnjmedia-camera-sensor-examplesuh1hhhhK`hjubh.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK`hj~hhubh)}(hhh](h)}(hControl frameworkh]hControl framework}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKcubh)}(hX``v4l2_ctrl_handler_setup()`` function may not be used in the device's runtime PM ``runtime_resume`` callback, as it has no way to figure out the power state of the device. This is because the power state of the device is only changed after the power state transition has taken place. The ``s_ctrl`` callback can be used to obtain device's power state after the power state transition:h](j)}(h``v4l2_ctrl_handler_setup()``h]hv4l2_ctrl_handler_setup()}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh7 function may not be used in the device’s runtime PM }(hjhhhNhNubj)}(h``runtime_resume``h]hruntime_resume}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh callback, as it has no way to figure out the power state of the device. This is because the power state of the device is only changed after the power state transition has taken place. The }(hjhhhNhNubj)}(h ``s_ctrl``h]hs_ctrl}(hj&hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubhX callback can be used to obtain device’s power state after the power state transition:}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKehjhhubhindex)}(hhh]h}(h]h ]h"]h$]h&]entries](single%pm_runtime_get_if_in_use (C function)c.pm_runtime_get_if_in_usehNtauh1j>hjhhhNhNubhdesc)}(hhh](hdesc_signature)}(h1int pm_runtime_get_if_in_use(struct device *dev);h]hdesc_signature_line)}(h1int pm_runtime_get_if_in_use(struct device *dev);h](hdesc_sig_keyword_type)}(hinth]hint}(hjbhhhNhNubah}(h]h ]ktah"]h$]h&]uh1j`hj\hhhhhKkubhdesc_sig_space)}(h h]h }(hjshhhNhNubah}(h]h ]wah"]h$]h&]uh1jqhj\hhhhhKkubh desc_name)}(hpm_runtime_get_if_in_useh]h desc_sig_name)}(hpm_runtime_get_if_in_useh]hpm_runtime_get_if_in_use}(hjhhhNhNubah}(h]h ]nah"]h$]h&]uh1jhjubah}(h]h ](sig-namedescnameeh"]h$]h&]hhuh1jhj\hhhhhKkubhdesc_parameterlist)}(h(struct device *dev)h]hdesc_parameter)}(hstruct device *devh](hdesc_sig_keyword)}(hstructh]hstruct}(hjhhhNhNubah}(h]h ]kah"]h$]h&]uh1jhjubjr)}(h h]h }(hjhhhNhNubah}(h]h ]j~ah"]h$]h&]uh1jqhjubh)}(hhh]j)}(hdeviceh]hdevice}(hjhhhNhNubah}(h]h ]jah"]h$]h&]uh1jhjubah}(h]h ]h"]h$]h&] refdomaincreftype identifier reftargetjmodnameN classnameN c:parent_keysphinx.domains.c LookupKey)}data]j ASTIdentifier)}jjsbc.pm_runtime_get_if_in_useasbuh1hhjubjr)}(h h]h }(hjhhhNhNubah}(h]h ]j~ah"]h$]h&]uh1jqhjubhdesc_sig_punctuation)}(h*h]h*}(hjhhhNhNubah}(h]h ]pah"]h$]h&]uh1jhjubj)}(hdevh]hdev}(hjhhhNhNubah}(h]h ]jah"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]noemphhhuh1jhjubah}(h]h ]h"]h$]h&]hhuh1jhj\hhhhhKkubj)}(h;h]h;}(hj2hhhNhNubah}(h]h ]jah"]h$]h&]uh1jhj\hhhhhKkubeh}(h]h ]h"]h$]h&]hh add_permalinkuh1jZsphinx_line_type declaratorhjVhhhhhKkubah}(h]jMah ](sig sig-objecteh"]h$]h&] is_multiline _toc_parts) _toc_namehuh1jThhhKkhjQhhubh desc_content)}(hhh]h}(h]h ]h"]h$]h&]uh1jThjQhhhhhKkubeh}(h]h ](jfunctioneh"]h$]h&]domainjobjtypejbdesctypejbnoindex noindexentrynocontentsentryuh1jOhhhjhNhNubh)}(hThe function returns a non-zero value if it succeeded getting the power count or runtime PM was disabled, in either of which cases the driver may proceed to access the device.h]hThe function returns a non-zero value if it succeeded getting the power count or runtime PM was disabled, in either of which cases the driver may proceed to access the device.}(hjlhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKmhjhhubeh}(h]control-frameworkah ]h"]control frameworkah$]h&]uh1hhj~hhhhhKcubeh}(h]power-managementah ]h"]power managementah$]h&]uh1hhhhhhhhK6ubh)}(hhh](h)}(h"Rotation, orientation and flippingh]h"Rotation, orientation and flipping}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKrubh)}(hUse ``v4l2_fwnode_device_parse()`` to obtain rotation and orientation information from system firmware and ``v4l2_ctrl_new_fwnode_properties()`` to register the appropriate controls.h](hUse }(hjhhhNhNubj)}(h``v4l2_fwnode_device_parse()``h]hv4l2_fwnode_device_parse()}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubhI to obtain rotation and orientation information from system firmware and }(hjhhhNhNubj)}(h%``v4l2_ctrl_new_fwnode_properties()``h]h!v4l2_ctrl_new_fwnode_properties()}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh& to register the appropriate controls.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKthjhhubh)}(h!.. _media-camera-sensor-examples:h]h}(h]h ]h"]h$]h&]hmedia-camera-sensor-examplesuh1hhKxhjhhhhubeh}(h]!rotation-orientation-and-flippingah ]h"]"rotation, orientation and flippingah$]h&]uh1hhhhhhhhKrubh)}(hhh](h)}(hExample driversh]hExample drivers}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhK{ubh)}(hFeatures implemented by sensor drivers vary, and depending on the set of supported features and other qualities, particular sensor drivers better serve the purpose of an example. The following drivers are known to be good examples:h]hFeatures implemented by sensor drivers vary, and depending on the set of supported features and other qualities, particular sensor drivers better serve the purpose of an example. The following drivers are known to be good examples:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK}hjhhubhtable)}(hhh](h)}(hExample sensor driversh]hExample sensor drivers}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubhtgroup)}(hhh](hcolspec)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jhjubj)}(hhh]h}(h]h ]h"]h$]h&]colwidthKuh1jhjubhtbody)}(hhh](hrow)}(hhh](hentry)}(hhh]h)}(h Driver nameh]h Driver name}(hjPhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjMubah}(h]h ]h"]h$]h&]uh1jKhjHubjL)}(hhh]h)}(hFile(s)h]hFile(s)}(hjghhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjdubah}(h]h ]h"]h$]h&]uh1jKhjHubjL)}(hhh]h)}(h Driver typeh]h Driver type}(hj~hhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhj{ubah}(h]h ]h"]h$]h&]uh1jKhjHubjL)}(hhh]h)}(h Example topich]h Example topic}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h ]h"]h$]h&]uh1jKhjHubeh}(h]h ]h"]h$]h&]uh1jFhjCubjG)}(hhh](jL)}(hhh]h)}(hCCSh]hCCS}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhjubah}(h]h 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