drivers/input/matrix-keymap.c

Source file repositories/reference/linux-study-clean/drivers/input/matrix-keymap.c

File Facts

System
Linux kernel
Corpus path
drivers/input/matrix-keymap.c
Extension
.c
Size
5394 bytes
Lines
197
Domain
Driver Families
Bucket
drivers/input
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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.

Dependency Surface

Detected Declarations

Annotated Snippet

if (!keymap) {
			dev_err(input_dev->dev.parent,
				"Unable to allocate memory for keymap");
			return -ENOMEM;
		}
	}

	input_dev->keycode = keymap;
	input_dev->keycodesize = sizeof(*keymap);
	input_dev->keycodemax = max_keys;

	__set_bit(EV_KEY, input_dev->evbit);

	if (keymap_data) {
		for (i = 0; i < keymap_data->keymap_size; i++) {
			unsigned int key = keymap_data->keymap[i];

			if (!matrix_keypad_map_key(input_dev, rows, cols,
						   row_shift, key))
				return -EINVAL;
		}
	} else {
		error = matrix_keypad_parse_keymap(keymap_name, rows, cols,
						   input_dev);
		if (error)
			return error;
	}

	__clear_bit(KEY_RESERVED, input_dev->keybit);

	return 0;
}
EXPORT_SYMBOL(matrix_keypad_build_keymap);

MODULE_DESCRIPTION("Helpers for matrix keyboard bindings");
MODULE_LICENSE("GPL");

Annotation

Implementation Notes