14 0x10	high nibble red gain low nibble blue gain
15 0x11	low nibble green gain
17 0x05	red gain 0-127
18 0x06	blue gain 0-127
19 0x07	green gain 0-127
115    if we adjust the gain or exposure we must ignore at least the next frame for
230 	   add a bit additional red gain and a lot additional blue gain, which
291   0x09 Blue Gain
292   0x0a Green1 Gain
293   0x0b Green2 Gain
294   0x0c Red Gain
295   0x0e Global gain
315 	/* Color Gain B Pixel 5 a */
317 	/* Color Gain G1 Pixel 1 5 */
319 	/* Color Gain G2 Pixel 1 0 5 */
321 	/* Color Gain R Pixel 3 1 */
325 	/* Global Gain */
352   0x07 Blue Gain
353   0x08 Green Gain
354   0x09 Red Gain
360   0x10 Master gain 0 - 31
400  * reg02: gain, bit order reversed!! 0 == max gain, 255 == min gain
582 	u8 gain = gspca_dev->gain->val;  in setgain()  local
589 		i2c[3] = 0x3f - gain;  in setgain()
590 		i2c[4] = 0x3f - gain;  in setgain()
591 		i2c[5] = 0x3f - gain;  in setgain()
601 		i2c[4] = 255 - gain;  in setgain()
608 		gain = 255 - gain;  in setgain()
610 		i2c[3] |= (gain & 0x80) >> 7;  in setgain()
611 		i2c[3] |= (gain & 0x40) >> 5;  in setgain()
612 		i2c[3] |= (gain & 0x20) >> 3;  in setgain()
613 		i2c[3] |= (gain & 0x10) >> 1;  in setgain()
614 		i2c[3] |= (gain & 0x08) << 1;  in setgain()
615 		i2c[3] |= (gain & 0x04) << 3;  in setgain()
616 		i2c[3] |= (gain & 0x02) << 5;  in setgain()
617 		i2c[3] |= (gain & 0x01) << 7;  in setgain()
626 		 * The ov7630's gain is weird, at 32 the gain drops to the  in setgain()
629 		if (sd->sensor == SENSOR_OV7630 && gain >= 32)  in setgain()
630 			gain += 16;  in setgain()
633 		i2c[3] = gain;  in setgain()
654 		i2cpgain[3] = gain;  in setgain()
655 		i2cpcolorgain[3] = gain >> 1;  in setgain()
656 		i2cpcolorgain[4] = gain >> 1;  in setgain()
657 		i2cpcolorgain[5] = gain >> 1;  in setgain()
658 		i2cpcolorgain[6] = gain >> 1;  in setgain()
667 			u8 buf[3] = { gain, gain, gain }; /* R, G, B */  in setgain()
671 			buf[0] = gain << 4 | gain; /* Red and blue */  in setgain()
672 			buf[1] = gain; /* Green */  in setgain()
908 		int gain_knee = (s32)gspca_dev->gain->maximum * 9 / 10;  in do_autogain()
963 		   we are on a valid point of the autogain gain /  in sd_s_ctrl()
966 		gspca_dev->gain->val = gspca_dev->gain->default_value;  in sd_s_ctrl()
981 		if (gspca_dev->gain->is_new || (ctrl->is_new && ctrl->val))  in sd_s_ctrl()
1011 	/* Gain range is sensor dependent */  in sd_init_controls()
1016 		gspca_dev->gain = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,  in sd_init_controls()
1020 		gspca_dev->gain = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,  in sd_init_controls()
1024 		gspca_dev->gain = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,  in sd_init_controls()
1030 		gspca_dev->gain = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,  in sd_init_controls()
1035 			gspca_dev->gain = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,  in sd_init_controls()
1038 			gspca_dev->gain = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,  in sd_init_controls()
1101 	/* Set bridge gain to 1.0 */  in sd_start()