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authorRong Zhang <i@rong.moe>2026-01-21 02:20:07 +0800
committerIlpo Järvinen <ilpo.jarvinen@linux.intel.com>2026-01-21 10:49:57 +0200
commit67d9a39ce85fafc2d88f82c9229ace111aaa8c1f (patch)
tree7817f1223119557eb77a2ce655caff810f82f8d5 /tools/perf/lib/Documentation/tutorial/git@git.tavy.me:linux.git
parent012a8f967a87dea3f25c3a3ae32610c0dd145f34 (diff)
platform/x86: lenovo-wmi-capdata: Wire up Fan Test Data
A capdata00 attribute (0x04050000) describes the presence of Fan Test Data. Query it, and bind Fan Test Data as a component of capdata00 accordingly. The component master of capdata00 may pass a callback while binding to retrieve fan info from Fan Test Data. Summarizing this scheme: lenovo-wmi-other <-> capdata00 <-> capdata_fan |- master |- component | |- sub-master |- sub-component The callback will be called once both the master and the sub-component are bound to the sub-master (component). This scheme is essential to solve these issues: - The component framework only supports one aggregation per master - A binding is only established until all components are found - The Fan Test Data interface may be missing on some devices - To get rid of queries for the presence of WMI GUIDs - The notifier framework cannot cleanly connect capdata_fan to lenovo-wmi-other without introducing assumptions on probing sequence capdata00 is registered as a component and a sub-master on probe, instead of chaining the registrations in one's bind callback. This is because calling (un)registration methods of the component framework causes deadlock in (un)bind callbacks, i.e., it's impossible to register capdata00 as a sub-master/component in its component/sub-master bind callback, and vice versa. Signed-off-by: Rong Zhang <i@rong.moe> Reviewed-by: Derek J. Clark <derekjohn.clark@gmail.com> Tested-by: Derek J. Clark <derekjohn.clark@gmail.com> Link: https://patch.msgid.link/20260120182104.163424-7-i@rong.moe Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
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