[media] gspca: Remove gspca_auto_gain_n_exposure function

Now that the pac207 driver has been converted to the control framework, there
are no remaining users.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 0 insertions, 91 deletions

diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index 38b124ec23a3..2b393b2cf62d 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -2435,95 +2435,6 @@ int gspca_resume(struct usb_interface *intf)
 }
 EXPORT_SYMBOL(gspca_resume);
 #endif
-/* -- cam driver utility functions -- */
-
-/* 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. */
-int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
-        int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee)
-{
-        int i, steps, gain, orig_gain, exposure, orig_exposure, autogain;
-        const struct ctrl *gain_ctrl = NULL;
-        const struct ctrl *exposure_ctrl = NULL;
-        const struct ctrl *autogain_ctrl = NULL;
-        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 (gspca_dev->sd_desc->ctrls[i].qctrl.id == V4L2_CID_AUTOGAIN)
-                        autogain_ctrl = &gspca_dev->sd_desc->ctrls[i];
-        }
-        if (!gain_ctrl || !exposure_ctrl || !autogain_ctrl) {
-                PDEBUG(D_ERR, "Error: gspca_auto_gain_n_exposure called "
-                        "on cam without (auto)gain/exposure");
-                return 0;
-        }
-
-        if (gain_ctrl->get(gspca_dev, &gain) ||
-                        exposure_ctrl->get(gspca_dev, &exposure) ||
-                        autogain_ctrl->get(gspca_dev, &autogain) || !autogain)
-                return 0;
-
-        orig_gain = gain;
-        orig_exposure = exposure;
-
-        /* 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 > gain_ctrl->qctrl.default_value)
-                                gain--;
-                        else if (exposure > exposure_ctrl->qctrl.minimum)
-                                exposure--;
-                        else if (gain > gain_ctrl->qctrl.minimum)
-                                gain--;
-                        else
-                                break;
-                } else {
-                        if (gain < gain_ctrl->qctrl.default_value)
-                                gain++;
-                        else if (exposure < exposure_knee)
-                                exposure++;
-                        else if (gain < gain_knee)
-                                gain++;
-                        else if (exposure < exposure_ctrl->qctrl.maximum)
-                                exposure++;
-                        else if (gain < gain_ctrl->qctrl.maximum)
-                                gain++;
-                        else
-                                break;
-                }
-        }
-
-        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;
-}
-EXPORT_SYMBOL(gspca_auto_gain_n_exposure);
 
 /* -- module insert / remove -- */
 static int __init gspca_init(void)
diff --git a/drivers/media/video/gspca/gspca.h b/drivers/media/video/gspca/gspca.h
index dd15e07d4666..dc688c7f5e48 100644
--- a/drivers/media/video/gspca/gspca.h
+++ b/drivers/media/video/gspca/gspca.h
@@ -251,8 +251,6 @@ void gspca_frame_add(struct gspca_dev *gspca_dev,
 int gspca_suspend(struct usb_interface *intf, pm_message_t message);
 int gspca_resume(struct usb_interface *intf);
 #endif
-int gspca_auto_gain_n_exposure(struct gspca_dev *gspca_dev, int avg_lum,
-        int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee);
 int gspca_expo_autogain(struct gspca_dev *gspca_dev, int avg_lum,
         int desired_avg_lum, int deadzone, int gain_knee, int exposure_knee);
 int gspca_coarse_grained_expo_autogain(struct gspca_dev *gspca_dev,