9 /* auto gain and exposure algorithm based on the knee algorithm described here:
12    Returns 0 if no changes were made, 1 if the gain and or exposure settings
22 	s32 gain, orig_gain, exposure, orig_exposure;  in gspca_expo_autogain()  local
29 	orig_exposure = exposure = v4l2_ctrl_g_ctrl(gspca_dev->exposure);  in gspca_expo_autogain()
42 			else if (exposure > exposure_knee)  in gspca_expo_autogain()
43 				exposure--;  in gspca_expo_autogain()
46 			else if (exposure > gspca_dev->exposure->minimum)  in gspca_expo_autogain()
47 				exposure--;  in gspca_expo_autogain()
55 			else if (exposure < exposure_knee)  in gspca_expo_autogain()
56 				exposure++;  in gspca_expo_autogain()
59 			else if (exposure < gspca_dev->exposure->maximum)  in gspca_expo_autogain()
60 				exposure++;  in gspca_expo_autogain()
72 	if (exposure != orig_exposure) {  in gspca_expo_autogain()
73 		v4l2_ctrl_s_ctrl(gspca_dev->exposure, exposure);  in gspca_expo_autogain()
79 			  gain, exposure);  in gspca_expo_autogain()
84 /* Autogain + exposure algorithm for cameras with a coarse exposure control
85    (usually this means we can only control the clockdiv to change exposure)
87    example, will lead to a huge exposure change (it effectively doubles),
89    80 %) and if that does not help, only then changes exposure. This leads
91    certain points of the knee graph will only try to adjust exposure,
92    which leads to oscillating as one exposure step is huge.
94    Returns 0 if no changes were made, 1 if the gain and or exposure settings
102 	s32 gain_low, gain_high, gain, orig_gain, exposure, orig_exposure;  in gspca_coarse_grained_expo_autogain()  local
109 	orig_exposure = exposure = v4l2_ctrl_g_ctrl(gspca_dev->exposure);  in gspca_coarse_grained_expo_autogain()
124 	    exposure < gspca_dev->exposure->maximum) {  in gspca_coarse_grained_expo_autogain()
129 		   exposure > gspca_dev->exposure->minimum) {  in gspca_coarse_grained_expo_autogain()
144 		exposure--;  in gspca_coarse_grained_expo_autogain()
147 		exposure++;  in gspca_coarse_grained_expo_autogain()
155 	if (exposure != orig_exposure) {  in gspca_coarse_grained_expo_autogain()
156 		v4l2_ctrl_s_ctrl(gspca_dev->exposure, exposure);  in gspca_coarse_grained_expo_autogain()
162 			  gain, exposure);  in gspca_coarse_grained_expo_autogain()