[media] gspca: Remove coarse_expo_autogain.h

This file is replaced by autogain_functions.h.
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/coarse_expo_autogain.h

-/*
- * Auto gain algorithm for camera's with a coarse exposure control
- *
- * Copyright (C) 2010 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
- */
-
-/* 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_high_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 int gspca_coarse_grained_expo_autogain(struct gspca_dev *gspca_dev,
-	int avg_lum, int desired_avg_lum, int deadzone)
-{
-	int i, steps, gain, orig_gain, exposure, orig_exposure;
-	int gain_low, gain_high;
-	const struct ctrl *gain_ctrl = NULL;
-	const struct ctrl *exposure_ctrl = NULL;
-	struct sd *sd = (struct sd *) gspca_dev;
-	int retval = 0;
-
-	for (i = 0; i < gspca_dev->sd_desc->nctrls; i++) {
-		if (gspca_dev->ctrl_dis & (1 << i))
-			continue;
-		if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_GAIN)
-			gain_ctrl = &gspca_dev->sd_desc->ctrls[i];
-		if (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_EXPOSURE)
-			exposure_ctrl = &gspca_dev->sd_desc->ctrls[i];
-	}
-	if (!gain_ctrl || !exposure_ctrl) {
-		PDEBUG(D_ERR, "Error: gspca_coarse_grained_expo_autogain "
-			"called on cam without gain or exposure");
-		return 0;
-	}
-
-	if (gain_ctrl->get(gspca_dev, &gain) ||
-	    exposure_ctrl->get(gspca_dev, &exposure))
-		return 0;
-
-	orig_gain = gain;
-	orig_exposure = exposure;
-	gain_low =
-		(gain_ctrl->qctrl.maximum - gain_ctrl->qctrl.minimum) / 5 * 2;
-	gain_low += gain_ctrl->qctrl.minimum;
-	gain_high =
-		(gain_ctrl->qctrl.maximum - gain_ctrl->qctrl.minimum) / 5 * 4;
-	gain_high += gain_ctrl->qctrl.minimum;
-
-	/* 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 &&
-	    sd->exposure < exposure_ctrl->qctrl.maximum) {
-		gain = gain_high;
-		sd->exp_too_low_cnt++;
-	} else if ((gain + steps) < gain_low &&
-		   sd->exposure > exposure_ctrl->qctrl.minimum) {
-		gain = gain_low;
-		sd->exp_too_high_cnt++;
-	} else {
-		gain += steps;
-		if (gain > gain_ctrl->qctrl.maximum)
-			gain = gain_ctrl->qctrl.maximum;
-		else if (gain < gain_ctrl->qctrl.minimum)
-			gain = gain_ctrl->qctrl.minimum;
-		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) {
-		gain_ctrl->set(gspca_dev, gain);
-		retval = 1;
-	}
-	if (exposure != orig_exposure) {
-		exposure_ctrl->set(gspca_dev, exposure);
-		retval = 1;
-	}
-
-	return retval;
-}