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Commit 48bb7315 authored by Hans de Goede's avatar Hans de Goede Committed by Mauro Carvalho Chehab
Browse files

[media] gspca_pac7302: Document some more registers 



Note like all info on the pac73xx chips, this info was found by trial and
error, so it is not necessarily 100% correct.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 895d464d

drivers/media/video/gspca/pac7302.c

+15 −1
Original line number Diff line number Diff line
@@ -30,6 +30,14 @@ 
 *

 * Address	Description

 * 0x78		Global control, bit 6 controls the LED (inverted)

 * 0x80		Compression balance, 2 interesting settings:

 *		0x0f Default

 *		0x50 Values >= this switch the camera to a lower compression,

 *		     using the same table for both luminance and chrominance.

 *		     This gives a sharper picture. Only usable when running

 *		     at < 15 fps! Note currently the driver does not use this

 *		     as the quality gain is small and the generated JPG-s are

 *		     only understood by v4l-utils >= 0.8.9

 *

 * Register page 3:

 *
@@ -43,8 +51,14 @@ 
 *		1 -> ~30 fps, 2 -> ~20 fps

 * 0x0e		Exposure bits 0-7, 0-448, 0 = use full frame time

 * 0x0f		Exposure bit 8, 0-448, 448 = no exposure at all

 * 0x10		Master gain 0-31

 * 0x10		Gain 0-31

 * 0x12		Another gain 0-31, unlike 0x10 this one seems to start with an

 *		amplification value of 1 rather then 0 at its lowest setting

 * 0x21		Bitfield: 0-1 unused, 2-3 vflip/hflip, 4-5 unknown, 6-7 unused

 * 0x80		Another framerate control, best left at 1, moving it from 1 to

 *		2 causes the framerate to become 3/4th of what it was, and

 *		also seems to cause pixel averaging, resulting in an effective

 *		resolution of 320x240 and thus a much blockier image

 *

 * The registers are accessed in the following functions:

 *