29 0x19	high-nibble is sensor clock divider, changes exposure on sensors which
115    if we adjust the gain or exposure we must ignore at least the next frame for
282   0x05 Shutter Time Line Offset, this can be used as an exposure control:
283        0 = use full frame time, 255 = no exposure at all
285        When var-framerate control is < 514, no exposure is reached at the max
287   0x06 Shutter Time Pixel Offset, like reg05 this influences exposure, but
358        leave at 1 otherwise we get a jump in our exposure control
359   0x0f Exposure 0-255, 0 = use full frame time, 255 = no exposure at all
416 					* shutter 0x47 short exposure? */
418 					/* shutter 0x01 long exposure */
684 		/* Note the datasheet wrongly says line mode exposure uses reg  in setexposure()
687 		u16 reg = gspca_dev->exposure->val;  in setexposure()
699 		u8 reg = gspca_dev->exposure->val;  in setexposure()
708 		   exposure, register 11, whose low nibble sets the nr off fps  in setexposure()
711 		   The fps configures the maximum exposure setting, but it is  in setexposure()
712 		   possible to use less exposure then what the fps maximum  in setexposure()
714 		   actual exposure as quotient of the full exposure, with 0  in setexposure()
715 		   being no exposure at all (not very useful) and reg10_max  in setexposure()
716 		   being max exposure possible at that framerate.  in setexposure()
718 		   The code maps our 0 - 510 ms exposure ctrl to these 2  in setexposure()
736 		reg11 = (15 * gspca_dev->exposure->val + 999) / 1000;  in setexposure()
748 		/* frame exposure time in ms = 1000 * reg11 / 30    ->  in setexposure()
749 		reg10 = (gspca_dev->exposure->val / 2) * reg10_max  in setexposure()
751 		reg10 = (gspca_dev->exposure->val * 15 * reg10_max)  in setexposure()
786 		/* The exposure knee for the autogain algorithm is 200  in setexposure()
793 		   frame exposure times (like we are doing with the ov chips),  in setexposure()
794 		   as that sometimes leads to jumps in the exposure control,  in setexposure()
795 		   which are bad for auto exposure. */  in setexposure()
796 		if (gspca_dev->exposure->val < 200) {  in setexposure()
797 			i2cpexpo[3] = 255 - (gspca_dev->exposure->val * 255)  in setexposure()
801 			/* The PAS202's exposure control goes from 0 - 4095,  in setexposure()
804 			framerate_ctrl = (gspca_dev->exposure->val - 200)  in setexposure()
824 		/* For values below 150 use partial frame exposure, above  in setexposure()
826 		if (gspca_dev->exposure->val < 150) {  in setexposure()
827 			i2cpexpo[3] = 150 - gspca_dev->exposure->val;  in setexposure()
830 			/* The PAS106's exposure control goes from 0 - 4095,  in setexposure()
833 			framerate_ctrl = (gspca_dev->exposure->val - 150)  in setexposure()
903 	if (gspca_dev->exposure->maximum < 500) {  in do_autogain()
964 		   exposure knee graph, and give this change time to  in sd_s_ctrl()
967 		gspca_dev->exposure->val = gspca_dev->exposure->default_value;  in sd_s_ctrl()
979 		if (gspca_dev->exposure->is_new || (ctrl->is_new && ctrl->val))  in sd_s_ctrl()
1043 	/* Exposure range is sensor dependent, and not all have exposure */  in sd_init_controls()
1046 		gspca_dev->exposure = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,  in sd_init_controls()
1054 		gspca_dev->exposure = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,  in sd_init_controls()
1060 		gspca_dev->exposure = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,  in sd_init_controls()
1065 	if (gspca_dev->exposure) {  in sd_init_controls()
1111 	/* Setup pixel numbers and auto exposure window */  in sd_start()
1138 		   nibble of 0x19 is exposure (clock divider) just as with  in sd_start()
1254 	 *	ll mm		brightness sum inside auto exposure  in find_sof()
1255 	 *	ll mm		brightness sum outside auto exposure  in find_sof()
1354 		/* When exposure changes midway a frame we  in sd_pkt_scan()
1356 		   as the frames directly after an exposure  in sd_pkt_scan()
1359 		   low exposure setting), so do not drop frames  in sd_pkt_scan()