are cheap USB cards with analog line input supported by ALSA ?

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Hello,

I see a number of relatively cheap soundcards on eBay:

http://www.ebay.com/itm/W449-USB-6-Channel-5-1-Audio-Sound-Card-S-PDIF-Exter-/250754613678?pt=LH_DefaultDomain_0&hash=item3a6223c1ae ;
http://www.ebay.com/itm/C449-USB-6-Channel-5-1-Audio-Sound-Card-S-PDIF-Exter-/170729413148?pt=LH_DefaultDomain_0&hash=item27c0441a1c ;
http://www.ebay.com/itm/USB-6-Channel-5-1-External-Audio-Sound-Card-S-PDIF-/190490619104?pt=LH_DefaultDomain_0&hash=item2c5a202ce0 ;
http://www.ebay.com/itm/USB-6-Channel-5-1-External-Audio-Sound-Card-S-PDIF-SC6-/390369489431?pt=LH_DefaultDomain_0&hash=item5ae3d5b217 ;
http://www.ebay.com/itm/New-USB-6-Channel-External-Audio-Sound-Card-S-PDIF-PC-/270748963523?pt=LH_DefaultDomain_0&hash=item3f09e552c3 ;
http://www.ebay.com/itm/External-USB-6-Channel-7-1-Audio-Sound-Card-S-PDIF-877-/180660714139?pt=LH_DefaultDomain_0&hash=item2a1037ba9b ;
http://www.ebay.com/itm/USB-6-Channel-5-1-External-Audio-Sound-Card-S-PDIF-Consumer-interface-SC6-/180872462245?pt=LH_DefaultDomain_0&hash=item2a1cd6bfa5 ;
http://www.ebay.com/itm/Multi-sound-effects-USB-6-Channel-5-1-External-Audio-Sound-Card-Laptop-PC-/110860124104?pt=LH_DefaultDomain_0&hash=item19cfc73fc8 - in this listing CMedia is mentioned 
;http://www.ebay.com/itm/6-Channel-6CH-USB-2-0-5-1-External-USB-Video-Audio-Adapter-Audio-Sound-Card-NEW-/270955321001?pt=LH_DefaultDomain_0&hash=item3f163216a9 - in this listing CMedia is mentioned ;
http://www.ebay.com/itm/NEW-USB-2-0-5-1-Channel-Speaker-System-Sound-Adapter-/250666394781?pt=LH_DefaultDomain_0&hash=item3a5ce1a49d - in this listing "USB Audio Device Class Specification 1.0" is mentioned

and similar.

Does anybody know whether these are supported by ALSA, what chip(s) are used, etc. ? I interested in "Line In" (capture) support.

Thanks,
  Sergei.

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