Turn off camera after release

Fixes https://source.puri.sm/Librem5/linux-next/-/issues/319 , although it might not be the cleanest place to do this.

added camera label

Can be tested by switching to the big camera and then crashing Megapixels, and then running it again.

I just saw the following after closing megapixels:

purism@pureos:~$ sudo ./cam_pm.sh 
---- hi846 -----
auto
suspended
---- samsung ---
auto
active
----------------
    clko2                             2        2        0    25000000          0     0  50000         Y
purism@pureos:~$ megapixels
Found config file at /usr/share/megapixels/config/purism,librem5r4.ini
Adding camera big from config
Adding camera selfie from config
Found postprocessor script at /usr/share/megapixels/postprocess.sh
MPDevice: MEDIA_IOC_SETUP_LINK error 25, Unpassender IOCTL (I/O-Control) für das Gerät
format 3 47425247
MPCamera: VIDIOC_S_FMT error 16, Das Gerät oder die Ressource ist belegt

** (megapixels:4599): CRITICAL **: 08:02:52.043: mp_camera_start_capture: assertion 'camera->has_set_mode' failed
MPCamera: VIDIOC_DQBUF error 22, Das Argument ist ungültig
purism@pureos:~$ 

so the big cam stayed "on". is this what you're referring to here? thanks! I'll test later.

I'm not sure how the "active" is derived, as there is a power off callin between, but it might be that. The s_fmt error is definitely that.

resolved all threads

merged

mentioned in issue #311 (closed)