drivers/auxdisplay/hd44780_common.h

File Facts

System

Linux kernel

Corpus path

drivers/auxdisplay/hd44780_common.h

Extension

.h

Size

1569 bytes

Lines

36

Domain

Driver Families

Bucket

drivers/auxdisplay

Inferred role

Driver Families: implementation source

Status

source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• 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

• struct hd44780_common

Annotated Snippet

struct hd44780_common {
	int ifwidth;			/* 4-bit or 8-bit (default) */
	int bwidth;			/* Default set by hd44780_alloc() */
	int hwidth;			/* Default set by hd44780_alloc() */
	unsigned long hd44780_common_flags;
	void (*write_data)(struct hd44780_common *hdc, int data);
	void (*write_cmd)(struct hd44780_common *hdc, int cmd);
	/* write_cmd_raw4 is for 4-bit connected displays only */
	void (*write_cmd_raw4)(struct hd44780_common *hdc, int cmd);
	void *hd44780;
};

int hd44780_common_print(struct charlcd *lcd, int c);
int hd44780_common_gotoxy(struct charlcd *lcd, unsigned int x, unsigned int y);
int hd44780_common_home(struct charlcd *lcd);
int hd44780_common_clear_display(struct charlcd *lcd);
int hd44780_common_init_display(struct charlcd *lcd);
int hd44780_common_shift_cursor(struct charlcd *lcd,
		enum charlcd_shift_dir dir);
int hd44780_common_shift_display(struct charlcd *lcd,
		enum charlcd_shift_dir dir);
int hd44780_common_display(struct charlcd *lcd, enum charlcd_onoff on);
int hd44780_common_cursor(struct charlcd *lcd, enum charlcd_onoff on);
int hd44780_common_blink(struct charlcd *lcd, enum charlcd_onoff on);
int hd44780_common_fontsize(struct charlcd *lcd, enum charlcd_fontsize size);
int hd44780_common_lines(struct charlcd *lcd, enum charlcd_lines lines);
int hd44780_common_redefine_char(struct charlcd *lcd, char *esc);

struct charlcd *hd44780_common_alloc(void);
void hd44780_common_free(struct charlcd *lcd);

Annotation

• Detected declarations: `struct hd44780_common`.
• Atlas domain: Driver Families / drivers/auxdisplay.
• Implementation status: source implementation candidate.

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.