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.
- 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.
- Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/device.hlinux/export.hlinux/gfp.hlinux/input.hlinux/input/matrix_keypad.hlinux/kernel.hlinux/module.hlinux/property.hlinux/slab.hlinux/types.h
Detected Declarations
function Copyrightfunction matrix_keypad_parse_propertiesfunction matrix_keypad_parse_keymapfunction keymapexport matrix_keypad_parse_propertiesexport matrix_keypad_build_keymap
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
- Immediate include surface: `linux/device.h`, `linux/export.h`, `linux/gfp.h`, `linux/input.h`, `linux/input/matrix_keypad.h`, `linux/kernel.h`, `linux/module.h`, `linux/property.h`.
- Detected declarations: `function Copyright`, `function matrix_keypad_parse_properties`, `function matrix_keypad_parse_keymap`, `function keymap`, `export matrix_keypad_parse_properties`, `export matrix_keypad_build_keymap`.
- Atlas domain: Driver Families / drivers/input.
- Implementation status: integration 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.