Integrate libsane and sane into Solaris [PSARC/2008/170 FastTrack timeout 03/11/2008]

[Lei Chen]

Bill Sommerfeld wrote:
> The whole "scanner as removable media" thing was a total distraction/red
> herring.
>
> Project team (or Darren?): is there a portable way with libsane to reset
> a scanner to its power-on-default or factory-default configuration?  Or
> does this require scanner-model-specific knowledge?
>   
The reset-to-default behavior depends on the hardware's capability. Some 
scanners support reset operation. Upon device close/open, a reset  
command will be sent to the device. For those that don't support 
hardware reset, the backend will call its own init_options() or similar 
function to set default parameters for a device upon sane_init(), 
sane_open() or  sane_start()[1], then write such parameters to device to 
acquire data. Some backend may even use all the methods to set initial 
state of a scanner. Application can change the parameter values by 
calling sane_control_option().  So, whenever a user starts to acquire 
image data from a scanner, the scanner's state is reset.

Thanks,
Lei Chen

[1] http://www.sane-project.org/html/doc013.html

> I think the pragmatic answer is to not make claims about device
> allocation as part of the spec for this case.
>
> Perhaps we could use some future project to extend device allocation to
> cope with devices accessed through libusb/ugen and similar frameworks
> rather than kernel drivers with device-class-specific drivers, and
> another one to unify the logindevperm mechanism with device allocation.
>
> Neither of those seems to be this case.
>
> 					- Bill
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