Documentation/driver-api/media/drivers/cx88-devel.rst

Source file repositories/reference/linux-study-clean/Documentation/driver-api/media/drivers/cx88-devel.rst

File Facts

System: Linux kernel
Corpus path: Documentation/driver-api/media/drivers/cx88-devel.rst
Extension: .rst
Size: 3191 bytes
Lines: 114
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.

Dependency Surface

No C-style include directives detected by the generator.

Detected Declarations

No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

.. SPDX-License-Identifier: GPL-2.0

The cx88 driver
===============

Author:  Gerd Hoffmann

Documentation missing at the cx88 datasheet
-------------------------------------------

MO_OUTPUT_FORMAT (0x310164)

.. code-block:: none

  Previous default from DScaler: 0x1c1f0008
  Digit 8: 31-28
  28: PREVREMOD = 1

  Digit 7: 27-24 (0xc = 12 = b1100 )
  27: COMBALT = 1
  26: PAL_INV_PHASE
    (DScaler apparently set this to 1, resulted in sucky picture)

  Digits 6,5: 23-16
  25-16: COMB_RANGE = 0x1f [default] (9 bits -> max 512)

  Digit 4: 15-12
  15: DISIFX = 0
  14: INVCBF = 0
  13: DISADAPT = 0
  12: NARROWADAPT = 0

  Digit 3: 11-8
  11: FORCE2H
  10: FORCEREMD
  9: NCHROMAEN
  8: NREMODEN

  Digit 2: 7-4
  7-6: YCORE
  5-4: CCORE

  Digit 1: 3-0
  3: RANGE = 1
  2: HACTEXT
  1: HSFMT

0x47 is the sync byte for MPEG-2 transport stream packets.
Datasheet incorrectly states to use 47 decimal. 188 is the length.
All DVB compliant frontends output packets with this start code.

Hauppauge WinTV cx88 IR information
-----------------------------------

The controls for the mux are GPIO [0,1] for source, and GPIO 2 for muting.

====== ======== =================================================
GPIO0  GPIO1
====== ======== =================================================
  0        0    TV Audio
  1        0    FM radio
  0        1    Line-In
  1        1    Mono tuner bypass or CD passthru (tuner specific)
====== ======== =================================================

GPIO 16(I believe) is tied to the IR port (if present).


From the data sheet:

Annotation

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.