[media] gscpa: Remove autogain_functions.h

Now that sonixj.c has been converted to the control framework it is no
longer used.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/usb/gspca/autogain_functions.h

-/*
- * Functions for auto gain.
- *
- * Copyright (C) 2010-2011 Hans de Goede <hdegoede@redhat.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- */
-
-#ifdef WANT_REGULAR_AUTOGAIN
-/* auto gain and exposure algorithm based on the knee algorithm described here:
-   http://ytse.tricolour.net/docs/LowLightOptimization.html
-
-   Returns 0 if no changes were made, 1 if the gain and or exposure settings
-   where changed. */
-static inline int auto_gain_n_exposure(
-			struct gspca_dev *gspca_dev,
-			int avg_lum,
-			int desired_avg_lum,
-			int deadzone,
-			int gain_knee,
-			int exposure_knee)
-{
-	struct sd *sd = (struct sd *) gspca_dev;
-	int i, steps, gain, orig_gain, exposure, orig_exposure;
-	int retval = 0;
-
-	orig_gain = gain = sd->ctrls[GAIN].val;
-	orig_exposure = exposure = sd->ctrls[EXPOSURE].val;
-
-	/* If we are of a multiple of deadzone, do multiple steps to reach the
-	   desired lumination fast (with the risc of a slight overshoot) */
-	steps = abs(desired_avg_lum - avg_lum) / deadzone;
-
-	PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
-		avg_lum, desired_avg_lum, steps);
-
-	for (i = 0; i < steps; i++) {
-		if (avg_lum > desired_avg_lum) {
-			if (gain > gain_knee)
-				gain--;
-			else if (exposure > exposure_knee)
-				exposure--;
-			else if (gain > sd->ctrls[GAIN].def)
-				gain--;
-			else if (exposure > sd->ctrls[EXPOSURE].min)
-				exposure--;
-			else if (gain > sd->ctrls[GAIN].min)
-				gain--;
-			else
-				break;
-		} else {
-			if (gain < sd->ctrls[GAIN].def)
-				gain++;
-			else if (exposure < exposure_knee)
-				exposure++;
-			else if (gain < gain_knee)
-				gain++;
-			else if (exposure < sd->ctrls[EXPOSURE].max)
-				exposure++;
-			else if (gain < sd->ctrls[GAIN].max)
-				gain++;
-			else
-				break;
-		}
-	}
-
-	if (gain != orig_gain) {
-		sd->ctrls[GAIN].val = gain;
-		setgain(gspca_dev);
-		retval = 1;
-	}
-	if (exposure != orig_exposure) {
-		sd->ctrls[EXPOSURE].val = exposure;
-		setexposure(gspca_dev);
-		retval = 1;
-	}
-
-	if (retval)
-		PDEBUG(D_FRAM, "autogain: changed gain: %d, expo: %d",
-			gain, exposure);
-	return retval;
-}
-#endif
-
-#ifdef WANT_COARSE_EXPO_AUTOGAIN
-/* Autogain + exposure algorithm for cameras with a coarse exposure control
-   (usually this means we can only control the clockdiv to change exposure)
-   As changing the clockdiv so that the fps drops from 30 to 15 fps for
-   example, will lead to a huge exposure change (it effectively doubles),
-   this algorithm normally tries to only adjust the gain (between 40 and
-   80 %) and if that does not help, only then changes exposure. This leads
-   to a much more stable image then using the knee algorithm which at
-   certain points of the knee graph will only try to adjust exposure,
-   which leads to oscilating as one exposure step is huge.
-
-   Note this assumes that the sd struct for the cam in question has
-   exp_too_low_cnt and exp_too_high_cnt int members for use by this function.
-
-   Returns 0 if no changes were made, 1 if the gain and or exposure settings
-   where changed. */
-static inline int coarse_grained_expo_autogain(
-			struct gspca_dev *gspca_dev,
-			int avg_lum,
-			int desired_avg_lum,
-			int deadzone)
-{
-	struct sd *sd = (struct sd *) gspca_dev;
-	int steps, gain, orig_gain, exposure, orig_exposure;
-	int gain_low, gain_high;
-	int retval = 0;
-
-	orig_gain = gain = sd->ctrls[GAIN].val;
-	orig_exposure = exposure = sd->ctrls[EXPOSURE].val;
-
-	gain_low = (sd->ctrls[GAIN].max - sd->ctrls[GAIN].min) / 5 * 2;
-	gain_low += sd->ctrls[GAIN].min;
-	gain_high = (sd->ctrls[GAIN].max - sd->ctrls[GAIN].min) / 5 * 4;
-	gain_high += sd->ctrls[GAIN].min;
-
-	/* If we are of a multiple of deadzone, do multiple steps to reach the
-	   desired lumination fast (with the risc of a slight overshoot) */
-	steps = (desired_avg_lum - avg_lum) / deadzone;
-
-	PDEBUG(D_FRAM, "autogain: lum: %d, desired: %d, steps: %d",
-		avg_lum, desired_avg_lum, steps);
-
-	if ((gain + steps) > gain_high &&
-	    exposure < sd->ctrls[EXPOSURE].max) {
-		gain = gain_high;
-		sd->exp_too_low_cnt++;
-		sd->exp_too_high_cnt = 0;
-	} else if ((gain + steps) < gain_low &&
-		   exposure > sd->ctrls[EXPOSURE].min) {
-		gain = gain_low;
-		sd->exp_too_high_cnt++;
-		sd->exp_too_low_cnt = 0;
-	} else {
-		gain += steps;
-		if (gain > sd->ctrls[GAIN].max)
-			gain = sd->ctrls[GAIN].max;
-		else if (gain < sd->ctrls[GAIN].min)
-			gain = sd->ctrls[GAIN].min;
-		sd->exp_too_high_cnt = 0;
-		sd->exp_too_low_cnt = 0;
-	}
-
-	if (sd->exp_too_high_cnt > 3) {
-		exposure--;
-		sd->exp_too_high_cnt = 0;
-	} else if (sd->exp_too_low_cnt > 3) {
-		exposure++;
-		sd->exp_too_low_cnt = 0;
-	}
-
-	if (gain != orig_gain) {
-		sd->ctrls[GAIN].val = gain;
-		setgain(gspca_dev);
-		retval = 1;
-	}
-	if (exposure != orig_exposure) {
-		sd->ctrls[EXPOSURE].val = exposure;
-		setexposure(gspca_dev);
-		retval = 1;
-	}
-
-	if (retval)
-		PDEBUG(D_FRAM, "autogain: changed gain: %d, expo: %d",
-			gain, exposure);
-	return retval;
-}
-#endif