[PATCH] remove non-cleanroom pwc driver compression

The original pwc author raised some questions about the reverse
engineering of the decompressor algorithms used in the pwc driver.
Having done some detailed investigation it appears those concerns that
clean room policy was not followed are reasonable.  I've also had a
friendly discussion with Philips to ask their view on this.

This removes the problem items of code which reduces the pwc
functionality in the kernel a little but leaves all the framework for
setup that will be needed for decompressors in user space (where they
eventually belong).  This change set is designed to be the minimal risk
change set given that 2.6.12 is hopefully close to hand, with a view to
merging the much updated pwc code in 2.6.13 series kernels.

Someone else can then redo the decompressors properly (clean room) in
user space.

Note that while its easy to say that it should have been caught earlier,
but the violation was really only obvious to someone who had access to
both the proprietary source and the 'GPL' source.

drivers/usb/media/pwc/Makefile

@@ -1,6 +1,6 @@
 ifneq ($(KERNELRELEASE),)
 
-pwc-objs	:= pwc-if.o pwc-misc.o pwc-ctrl.o pwc-uncompress.o pwc-dec1.o pwc-dec23.o pwc-kiara.o pwc-timon.o
+pwc-objs	:= pwc-if.o pwc-misc.o pwc-ctrl.o pwc-uncompress.o pwc-timon.o pwc-kiara.o
 
 obj-$(CONFIG_USB_PWC) += pwc.o
 

drivers/usb/media/pwc/pwc-ctrl.c

@@ -246,7 +246,7 @@ static inline int set_video_mode_Nala(struct pwc_device *pdev, int size, int fra
 	   switch(pdev->type) {
 	     case 645:
 	     case 646:
-	       pwc_dec1_init(pdev->type, pdev->release, buf, pdev->decompress_data);
+/*	       pwc_dec1_init(pdev->type, pdev->release, buf, pdev->decompress_data); */
 	       break;
 
 	     case 675:
@@ -256,7 +256,7 @@ static inline int set_video_mode_Nala(struct pwc_device *pdev, int size, int fra
 	     case 730:
 	     case 740:
 	     case 750:
-	       pwc_dec23_init(pdev->type, pdev->release, buf, pdev->decompress_data);
+/*	       pwc_dec23_init(pdev->type, pdev->release, buf, pdev->decompress_data); */
 	       break;
 	   }
 	}
@@ -318,8 +318,8 @@ static inline int set_video_mode_Timon(struct pwc_device *pdev, int size, int fr
 	if (ret < 0)
 		return ret;
 
-	if (pChoose->bandlength > 0 && pdev->vpalette != VIDEO_PALETTE_RAW)
-	   pwc_dec23_init(pdev->type, pdev->release, buf, pdev->decompress_data);
+/* 	if (pChoose->bandlength > 0 && pdev->vpalette != VIDEO_PALETTE_RAW)
+	   pwc_dec23_init(pdev->type, pdev->release, buf, pdev->decompress_data); */
 
 	pdev->cmd_len = 13;
 	memcpy(pdev->cmd_buf, buf, 13);
@@ -397,8 +397,8 @@ static inline int set_video_mode_Kiara(struct pwc_device *pdev, int size, int fr
 	if (ret < 0)
 		return ret;
 
-	if (pChoose->bandlength > 0 && pdev->vpalette != VIDEO_PALETTE_RAW)
-	  pwc_dec23_init(pdev->type, pdev->release, buf, pdev->decompress_data);
+/*	if (pChoose->bandlength > 0 && pdev->vpalette != VIDEO_PALETTE_RAW)
+	  pwc_dec23_init(pdev->type, pdev->release, buf, pdev->decompress_data); */
 
 	pdev->cmd_len = 12;
 	memcpy(pdev->cmd_buf, buf, 12);