drivers/media/video/pwc/pwc-dec1.c

   1 /* Linux driver for Philips webcam
   2    Decompression for chipset version 1
   3    (C) 2004-2006 Luc Saillard (luc@saillard.org)
   4
   5    NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx
   6    driver and thus may have bugs that are not present in the original version.
   7    Please send bug reports and support requests to <luc@saillard.org>.
   8    The decompression routines have been implemented by reverse-engineering the
   9    Nemosoft binary pwcx module. Caveat emptor.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24 */
  25 #include "pwc-dec1.h"
  26
  27 int pwc_dec1_init(struct pwc_device *pwc, int type, int release, void *buffer)
  28 {
  29         struct pwc_dec1_private *pdec;
  30
  31         if (pwc->decompress_data == NULL) {
  32                 pdec = kmalloc(sizeof(struct pwc_dec1_private), GFP_KERNEL);
  33                 if (pdec == NULL)
  34                         return -ENOMEM;
  35                 pwc->decompress_data = pdec;
  36         }
  37         pdec = pwc->decompress_data;
  38
  39         return 0;
  40 }