[libcamera-devel] [PATCH v2] libcamera: v4l2_device: Workaround faulty control menus

[Marian Buschsieweke]

Hi,

On Wed, 2 Nov 2022 21:44:41 +0100
Marian Buschsieweke <marian.buschsieweke at ovgu.de> wrote:

> I can test this tomorrow to confirm that exposure_auto cannot be set to any of
> [0..3], or whether indeed just the labels are missing.

at least for my K20 device it does indeed not support any of the menu items:

~ $ v4l2-ctl --list-devices
K20 USB CAMERA: K20 USB CAMERA (usb-0000:00:14.0-1):
	/dev/video2
	/dev/video3
	/dev/media1

Integrated Camera: Integrated C (usb-0000:00:14.0-8):
	/dev/video0
	/dev/video1
	/dev/media0

~ $ v4l2-ctl -d /dev/video2 -lL
                     brightness 0x00980900 (int)    : min=-64 max=64 step=1 default=0 value=0
                       contrast 0x00980901 (int)    : min=0 max=64 step=1 default=33 value=33
                     saturation 0x00980902 (int)    : min=0 max=128 step=1 default=64 value=64
                            hue 0x00980903 (int)    : min=-40 max=40 step=1 default=0 value=0
 white_balance_temperature_auto 0x0098090c (bool)   : default=1 value=1
                          gamma 0x00980910 (int)    : min=72 max=500 step=1 default=120 value=120
                           gain 0x00980913 (int)    : min=0 max=100 step=1 default=0 value=0
           power_line_frequency 0x00980918 (menu)   : min=0 max=2 default=1 value=1 (50 Hz)
				0: Disabled
				1: 50 Hz
				2: 60 Hz
      white_balance_temperature 0x0098091a (int)    : min=2800 max=6500 step=1 default=4600 value=4600 flags=inactive
                      sharpness 0x0098091b (int)    : min=0 max=6 step=1 default=6 value=6
         backlight_compensation 0x0098091c (int)    : min=0 max=2 step=1 default=1 value=1
                  exposure_auto 0x009a0901 (menu)   : min=0 max=3 default=0 value=0
              exposure_absolute 0x009a0902 (int)    : min=1 max=5000 step=1 default=2500 value=2500 flags=inactive
         exposure_auto_priority 0x009a0903 (bool)   : default=0 value=1
                 focus_absolute 0x009a090a (int)    : min=1 max=1023 step=1 default=1 value=230 flags=inactive
                     focus_auto 0x009a090c (bool)   : default=1 value=1
~ $ v4l2-ctl -d /dev/video2 -c exposure_auto=0
VIDIOC_S_EXT_CTRLS: failed: Invalid argument
Error setting controls: Invalid argument
~ $ v4l2-ctl -d /dev/video2 -c exposure_auto=1
VIDIOC_S_EXT_CTRLS: failed: Invalid argument
Error setting controls: Invalid argument
~ $ v4l2-ctl -d /dev/video2 -c exposure_auto=2
VIDIOC_S_EXT_CTRLS: failed: Invalid argument
Error setting controls: Invalid argument
~ $ v4l2-ctl -d /dev/video2 -c exposure_auto=3
VIDIOC_S_EXT_CTRLS: failed: Invalid argument
Error setting controls: Invalid argument

Kind regards,
Marian
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