€•¬$Œsphinx.addnodes”Œdocument”“”)”}”(Œ rawsource”Œ”Œchildren”]”(Œ translations”Œ LanguagesNode”“”)”}”(hhh]”(hŒ pending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”(hhŒparent”hubaŒ attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ refdomain”Œstd”Œreftype”Œdoc”Œ reftarget”Œ/translations/zh_CN/usb/ohci”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)”}”(hhh]”hŒChinese (Traditional)”…””}”(hhhh2ubah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ/translations/zh_TW/usb/ohci”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒItalian”…””}”(hhhhFubah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ/translations/it_IT/usb/ohci”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒJapanese”…””}”(hhhhZubah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ/translations/ja_JP/usb/ohci”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒKorean”…””}”(hhhhnubah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ/translations/ko_KR/usb/ohci”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒSpanish”…””}”(hhhh‚ubah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ/translations/sp_SP/usb/ohci”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h hhŒ _document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒOHCI”h]”hŒOHCI”…””}”(hhªhh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒ6/var/lib/git/docbuild/linux/Documentation/usb/ohci.rst”h KubhŒ paragraph”“”)”}”(hŒ 23-Aug-2002”h]”hŒ 23-Aug-2002”…””}”(hh»hh¹hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hX%The "ohci-hcd" driver is a USB Host Controller Driver (HCD) that is derived from the "usb-ohci" driver from the 2.4 kernel series. The "usb-ohci" code was written primarily by Roman Weissgaerber but with contributions from many others (read its copyright/licencing header).”h]”(hŒÑThe “ohci-hcd†driver is a USB Host Controller Driver (HCD) that is derived from the “usb-ohci†driver from the 2.4 kernel series. The “usb-ohci†code was written primarily by Roman Weissgaerber <”…””}”(hŒÅThe "ohci-hcd" driver is a USB Host Controller Driver (HCD) that is derived from the "usb-ohci" driver from the 2.4 kernel series. The "usb-ohci" code was written primarily by Roman Weissgaerber <”hhÇhžhhŸNh NubhŒ reference”“”)”}”(hŒweissg@vienna.at”h]”hŒweissg@vienna.at”…””}”(hhhhÒhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œmailto:weissg@vienna.at”uh1hÐhhÇubhŒP> but with contributions from many others (read its copyright/licencing header).”…””}”(hŒP> but with contributions from many others (read its copyright/licencing header).”hhÇhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hXdIt supports the "Open Host Controller Interface" (OHCI), which standardizes hardware register protocols used to talk to USB 1.1 host controllers. As compared to the earlier "Universal Host Controller Interface" (UHCI) from Intel, it pushes more intelligence into the hardware. USB 1.1 controllers from vendors other than Intel and VIA generally use OHCI.”h]”hXlIt supports the “Open Host Controller Interface†(OHCI), which standardizes hardware register protocols used to talk to USB 1.1 host controllers. As compared to the earlier “Universal Host Controller Interface†(UHCI) from Intel, it pushes more intelligence into the hardware. USB 1.1 controllers from vendors other than Intel and VIA generally use OHCI.”…””}”(hhïhhíhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K hh£hžhubh¸)”}”(hŒ$Changes since the 2.4 kernel include”h]”hŒ$Changes since the 2.4 kernel include”…””}”(hhýhhûhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubhŒ block_quote”“”)”}”(hhh]”hŒ bullet_list”“”)”}”(hhh]”(hŒ list_item”“”)”}”(hŒ0improved robustness; bugfixes; and less overhead”h]”h¸)”}”(hjh]”hŒ0improved robustness; bugfixes; and less overhead”…””}”(hjhjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khjubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjubj)”}”(hŒ0supports the updated and simplified usbcore APIs”h]”h¸)”}”(hj.h]”hŒ0supports the updated and simplified usbcore APIs”…””}”(hj.hj0hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khj,ubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjubj)”}”(hŒ4interrupt transfers can be larger, and can be queued”h]”h¸)”}”(hjEh]”hŒ4interrupt transfers can be larger, and can be queued”…””}”(hjEhjGhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KhjCubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjubj)”}”(hŒ3less code, by using the upper level "hcd" framework”h]”h¸)”}”(hj\h]”hŒ7less code, by using the upper level “hcd†framework”…””}”(hj\hj^hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KhjZubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjubj)”}”(hŒ-supports some non-PCI implementations of OHCI”h]”h¸)”}”(hjsh]”hŒ-supports some non-PCI implementations of OHCI”…””}”(hjshjuhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khjqubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjubj)”}”(hŒ ... more ”h]”h¸)”}”(hŒ... more”h]”hŒ... more”…””}”(hjŽhjŒhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khjˆubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjubeh}”(h]”h ]”h"]”h$]”h&]”Œbullet”Œ-”uh1jhŸh¶h Khj ubah}”(h]”h ]”h"]”h$]”h&]”uh1j hh£hžhhŸNh Nubh¸)”}”(hXÁThe "ohci-hcd" driver handles all USB 1.1 transfer types. Transfers of all types can be queued. That was also true in "usb-ohci", except for interrupt transfers. Previously, using periods of one frame would risk data loss due to overhead in IRQ processing. When interrupt transfers are queued, those risks can be minimized by making sure the hardware always has transfers to work on while the OS is getting around to the relevant IRQ processing.”h]”hXÉThe “ohci-hcd†driver handles all USB 1.1 transfer types. Transfers of all types can be queued. That was also true in “usb-ohciâ€, except for interrupt transfers. Previously, using periods of one frame would risk data loss due to overhead in IRQ processing. When interrupt transfers are queued, those risks can be minimized by making sure the hardware always has transfers to work on while the OS is getting around to the relevant IRQ processing.”…””}”(hj°hj®hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubj)”}”(hhh]”j)”}”(hŒ0David Brownell ”h]”h¸)”}”(hŒ0David Brownell ”h]”(hŒDavid Brownell <”…””}”(hŒDavid Brownell <”hjÃhžhhŸNh NubhÑ)”}”(hŒdbrownell@users.sourceforge.net”h]”hŒdbrownell@users.sourceforge.net”…””}”(hhhjÌhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œ&mailto:dbrownell@users.sourceforge.net”uh1hÐhjÃubhŒ>”…””}”(hŒ>”hjÃhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K"hj¿ubah}”(h]”h ]”h"]”h$]”h&]”uh1jhj¼hžhhŸh¶h Nubah}”(h]”h ]”h"]”h$]”h&]”j¦j§uh1jhŸh¶h K"hh£hžhubeh}”(h]”Œohci”ah ]”h"]”Œohci”ah$]”h&]”uh1h¡hhhžhhŸh¶h Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”h¶uh1hŒcurrent_source”NŒ current_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(h¦NŒ generator”NŒ datestamp”NŒ source_link”NŒ source_url”NŒ toc_backlinks”Œentry”Œfootnote_backlinks”KŒ sectnum_xform”KŒstrip_comments”NŒstrip_elements_with_classes”NŒ strip_classes”NŒ report_level”KŒ halt_level”KŒexit_status_level”KŒdebug”NŒwarning_stream”NŒ traceback”ˆŒinput_encoding”Œ utf-8-sig”Œinput_encoding_error_handler”Œstrict”Œoutput_encoding”Œutf-8”Œoutput_encoding_error_handler”jŒerror_encoding”ŒUTF-8”Œerror_encoding_error_handler”Œbackslashreplace”Œ language_code”Œen”Œrecord_dependencies”NŒconfig”NŒ id_prefix”hŒauto_id_prefix”Œid”Œ dump_settings”NŒdump_internals”NŒdump_transforms”NŒdump_pseudo_xml”NŒexpose_internals”NŒstrict_visitor”NŒ_disable_config”NŒ_source”h¶Œ _destination”NŒ _config_files”]”Œ7/var/lib/git/docbuild/linux/Documentation/docutils.conf”aŒpep_references”NŒ pep_base_url”Œhttps://peps.python.org/”Œpep_file_url_template”Œpep-%04d”Œrfc_references”NŒ rfc_base_url”Œ&https://datatracker.ietf.org/doc/html/”Œ tab_width”KŒtrim_footnote_reference_space”‰Œfile_insertion_enabled”ˆŒ raw_enabled”KŒline_length_limit”M'Œsyntax_highlight”Œlong”Œ smart_quotes”ˆŒsmartquotes_locales”]”Œcharacter_level_inline_markup”‰Œdoctitle_xform”‰Œ docinfo_xform”KŒsectsubtitle_xform”‰Œ image_loading”Œlink”Œembed_stylesheet”‰Œcloak_email_addresses”ˆŒsection_self_link”‰Œ embed_images”‰Œenv”NubŒreporter”NŒindirect_targets”]”Œsubstitution_defs”}”Œsubstitution_names”}”Œrefnames”}”Œrefids”}”Œnameids”}”jøjõsŒ nametypes”}”jøNsh}”jõh£sŒ footnote_refs”}”Œ citation_refs”}”Œ autofootnotes”]”Œautofootnote_refs”]”Œsymbol_footnotes”]”Œsymbol_footnote_refs”]”Œ footnotes”]”Œ citations”]”Œautofootnote_start”KŒsymbol_footnote_start”KŒ id_counter”Œ collections”ŒCounter”“”}”…”R”Œparse_messages”]”Œtransform_messages”]”Œ transformer”NŒ include_log”]”Œ decoration”Nhžhub.