Documentation/ABI/stable/sysfs-class-udc
Source file repositories/reference/linux-study-clean/Documentation/ABI/stable/sysfs-class-udc
File Facts
- System
- Linux kernel
- Corpus path
Documentation/ABI/stable/sysfs-class-udc- Extension
[no extension]- Size
- 2444 bytes
- Lines
- 94
- 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.
Dependency Surface
- No C-style include directives detected by the generator.
Detected Declarations
- No top-level syscall, struct, function, initcall, or export declaration detected by the generator.
Annotated Snippet
What: /sys/class/udc/<udc>/a_alt_hnp_support
Date: June 2011
KernelVersion: 3.1
Contact: Felipe Balbi <balbi@kernel.org>
Description:
Indicates if an OTG A-Host supports HNP at an alternate port.
Users:
What: /sys/class/udc/<udc>/a_hnp_support
Date: June 2011
KernelVersion: 3.1
Contact: Felipe Balbi <balbi@kernel.org>
Description:
Indicates if an OTG A-Host supports HNP at this port.
Users:
What: /sys/class/udc/<udc>/b_hnp_enable
Date: June 2011
KernelVersion: 3.1
Contact: Felipe Balbi <balbi@kernel.org>
Description:
Indicates if an OTG A-Host enabled HNP support.
Users:
What: /sys/class/udc/<udc>/current_speed
Date: June 2011
KernelVersion: 3.1
Contact: Felipe Balbi <balbi@kernel.org>
Description:
Indicates the current negotiated speed at this port.
Users:
What: /sys/class/udc/<udc>/is_a_peripheral
Date: June 2011
KernelVersion: 3.1
Contact: Felipe Balbi <balbi@kernel.org>
Description:
Indicates that this port is the default Host on an OTG session
but HNP was used to switch roles.
Users:
What: /sys/class/udc/<udc>/is_otg
Date: June 2011
KernelVersion: 3.1
Contact: Felipe Balbi <balbi@kernel.org>
Description:
Indicates that this port support OTG.
Users:
What: /sys/class/udc/<udc>/maximum_speed
Date: June 2011
KernelVersion: 3.1
Contact: Felipe Balbi <balbi@kernel.org>
Description:
Indicates the maximum USB speed supported by this port.
Users:
What: /sys/class/udc/<udc>/soft_connect
Date: June 2011
KernelVersion: 3.1
Contact: Felipe Balbi <balbi@kernel.org>
Description:
Allows users to disconnect data pullup resistors thus causing a
logical disconnection from the USB Host.
Users:
What: /sys/class/udc/<udc>/srp
Date: June 2011
KernelVersion: 3.1
Contact: Felipe Balbi <balbi@kernel.org>Annotation
- 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.