Documentation/i2c/functionality.rst

File Facts

System

Linux kernel

Corpus path

Documentation/i2c/functionality.rst

Extension

.rst

Size

6504 bytes

Lines

157

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

• No C-style include directives detected by the generator.

Detected Declarations

• function flags
• function i2c_pxa_functionality
• function transactions

Annotated Snippet

if (file = open("/dev/i2c-0", O_RDWR) < 0) {
	/* Some kind of error handling */
	exit(1);
  }
  if (ioctl(file, I2C_FUNCS, &funcs) < 0) {
	/* Some kind of error handling */
	exit(1);
  }
  if (!(funcs & I2C_FUNC_SMBUS_QUICK)) {
	/* Oops, the needed functionality (SMBus write_quick function) is
           not available! */
	exit(1);
  }
  /* Now it is safe to use the SMBus write_quick command */

Annotation

• Detected declarations: `function flags`, `function i2c_pxa_functionality`, `function transactions`.
• 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.