Documentation/input/ff.rst

Source file repositories/reference/linux-study-clean/Documentation/input/ff.rst

File Facts

System: Linux kernel
Corpus path: Documentation/input/ff.rst
Extension: .rst
Size: 7735 bytes
Lines: 266
Domain: Support Tooling And Documentation
Bucket: Documentation
Inferred role: Support Tooling And Documentation: documentation
Status: atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

linux/input.h
sys/ioctl.h
unistd.h

Detected Declarations

struct input_event

Annotated Snippet

struct input_event {
    /* When the status of the effect changed */
	    struct timeval time;

    /* Set to EV_FF_STATUS */
	    unsigned short type;

    /* Contains the id of the effect */
	    unsigned short code;

    /* Indicates the status */
	    unsigned int value;
    };

    FF_STATUS_STOPPED	The effect stopped playing
    FF_STATUS_PLAYING	The effect started to play

.. note::

    - Status feedback is only supported by iforce driver. If you have
      a really good reason to use this, please contact
      linux-joystick@atrey.karlin.mff.cuni.cz or anssi.hannula@gmail.com
      so that support for it can be added to the rest of the drivers.

Annotation

Immediate include surface: `linux/input.h`, `sys/ioctl.h`, `unistd.h`.
Detected declarations: `struct input_event`.
Atlas domain: Support Tooling And Documentation / Documentation.
Implementation status: atlas-only.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.