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authorTakashi Iwai <tiwai@suse.de>2010-01-27 18:01:53 -0500
committerTakashi Iwai <tiwai@suse.de>2010-01-27 18:04:21 -0500
commitb09f3e78ee7bb69171411b75bd9e771fc7f24749 (patch)
treeed4d4f357a805425e19de53b6b3710150482df06 /Documentation/sound/alsa/HD-Audio.txt
parentccc5df058da70d1c26c72cd1c24072a89998d735 (diff)
ALSA: hda - Allow override more fields via patch loader
Allow the override of vendor-id, subsystem-id, revision-id and chip name via patch loading. Updated the document, too. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound/alsa/HD-Audio.txt')
-rw-r--r--Documentation/sound/alsa/HD-Audio.txt27
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/alsa/HD-Audio.txt
index 6325bec06a72..f4dd3bf99d12 100644
--- a/Documentation/sound/alsa/HD-Audio.txt
+++ b/Documentation/sound/alsa/HD-Audio.txt
@@ -452,6 +452,33 @@ Similarly, the lines after `[verb]` are parsed as `init_verbs`
452sysfs entries, and the lines after `[hint]` are parsed as `hints` 452sysfs entries, and the lines after `[hint]` are parsed as `hints`
453sysfs entries, respectively. 453sysfs entries, respectively.
454 454
455Another example to override the codec vendor id from 0x12345678 to
4560xdeadbeef is like below:
457------------------------------------------------------------------------
458 [codec]
459 0x12345678 0xabcd1234 2
460
461 [vendor_id]
462 0xdeadbeef
463------------------------------------------------------------------------
464
465In the similar way, you can override the codec subsystem_id via
466`[subsystem_id]`, the revision id via `[revision_id]` line.
467Also, the codec chip name can be rewritten via `[chip_name]` line.
468------------------------------------------------------------------------
469 [codec]
470 0x12345678 0xabcd1234 2
471
472 [subsystem_id]
473 0xffff1111
474
475 [revision_id]
476 0x10
477
478 [chip_name]
479 My-own NEWS-0002
480------------------------------------------------------------------------
481
455The hd-audio driver reads the file via request_firmware(). Thus, 482The hd-audio driver reads the file via request_firmware(). Thus,
456a patch file has to be located on the appropriate firmware path, 483a patch file has to be located on the appropriate firmware path,
457typically, /lib/firmware. For example, when you pass the option 484typically, /lib/firmware. For example, when you pass the option