drivers/media/usb/dvb-usb/af9005-remote.c
Source file repositories/reference/linux-study-clean/drivers/media/usb/dvb-usb/af9005-remote.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/media/usb/dvb-usb/af9005-remote.c- Extension
.c- Size
- 3680 bytes
- Lines
- 145
- Domain
- Driver Families
- Bucket
- drivers/media
- 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.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
af9005.h
Detected Declarations
function af9005_rc_decodeexport rc_map_af9005_tableexport rc_map_af9005_table_sizeexport af9005_rc_decode
Annotated Snippet
if (space * 3 < mark) {
for (i = 0; i < ARRAY_SIZE(repeatable_keys); i++) {
if (d->last_event == repeatable_keys[i]) {
*state = REMOTE_KEY_REPEAT;
*event = d->last_event;
deb_decode("repeat key, event %x\n",
*event);
return 0;
}
}
deb_decode("repeated key ignored (non repeatable)\n");
return 0;
} else if (len >= 33 * 4) { /*32 bits + start code */
result = 0;
for (i = 4; i < 4 + 32 * 4; i += 4) {
result <<= 1;
mark = (u16) (data[i] << 8) + data[i + 1];
mark >>= 1;
space = (u16) (data[i + 2] << 8) + data[i + 3];
space >>= 1;
if (mark * 2 > space)
result += 1;
}
deb_decode("key pressed, raw value %x\n", result);
if ((result & 0xff000000) != 0xfe000000) {
deb_decode
("doesn't start with 0xfe, ignored\n");
return 0;
}
cust = (result >> 16) & 0xff;
dat = (result >> 8) & 0xff;
invdat = (~result) & 0xff;
if (dat != invdat) {
deb_decode("code != inverted code\n");
return 0;
}
for (i = 0; i < rc_map_af9005_table_size; i++) {
if (rc5_custom(&rc_map_af9005_table[i]) == cust
&& rc5_data(&rc_map_af9005_table[i]) == dat) {
*event = rc_map_af9005_table[i].keycode;
*state = REMOTE_KEY_PRESSED;
deb_decode
("key pressed, event %x\n", *event);
return 0;
}
}
deb_decode("not found in table\n");
}
}
return 0;
}
EXPORT_SYMBOL(rc_map_af9005_table);
EXPORT_SYMBOL(rc_map_af9005_table_size);
EXPORT_SYMBOL(af9005_rc_decode);
MODULE_AUTHOR("Luca Olivetti <luca@ventoso.org>");
MODULE_DESCRIPTION
("Standard remote control decoder for Afatech 9005 DVB-T USB1.1 stick");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL");
Annotation
- Immediate include surface: `af9005.h`.
- Detected declarations: `function af9005_rc_decode`, `export rc_map_af9005_table`, `export rc_map_af9005_table_size`, `export af9005_rc_decode`.
- Atlas domain: Driver Families / drivers/media.
- 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.