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authorDavid Herrmann <dh.herrmann@googlemail.com>2012-06-10 15:16:14 +0200
committerJiri Kosina <jkosina@suse.cz>2012-06-18 13:42:00 +0200
commitace3d8614ab0e6544f5f85921085b55b915fe9aa (patch)
treeb666635c332af039a991d8391b4f24ac62a51182 /scripts/tracing
parentHID: uhid: introduce user-space I/O driver support for HID (diff)
downloadlinux-ace3d8614ab0e6544f5f85921085b55b915fe9aa.tar.xz
linux-ace3d8614ab0e6544f5f85921085b55b915fe9aa.zip
HID: uhid: add internal message buffer
When receiving messages from the HID subsystem, we need to process them and store them in an internal buffer so user-space can read() on the char device to retrieve the messages. This adds a static buffer for 32 messages to each uhid device. Each message is dynamically allocated so the uhid_device structure does not get too big. uhid_queue() adds a message to the buffer. If the buffer is full, the message is discarded. uhid_queue_event() is an helper for messages without payload. This also adds a public header: uhid.h. It contains the declarations for the user-space API. It is built around "struct uhid_event" which contains a type field which specifies the event type and each event can then add a variable-length payload. For now, there is only a dummy event but later patches will add new event types and payloads. Signed-off-by: David Herrmann <dh.herrmann@googlemail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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