media: atomisp: gc0310: Drop custom ATOMISP_IOC_S_EXPOSURE support

Exposure and gain control should use standard v4l2 controls,
not a custom ioctl.

The next patch in this series will re-add support as standard controls,
this is split into 2 patches for easier reviewing.
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/i2c/atomisp-gc0310.c

@@ -57,104 +57,6 @@ static int gc0310_write_reg_array(struct i2c_client *client,
 	return 0;
 }
 
-static int gc0310_set_gain(struct v4l2_subdev *sd, int gain)
-
-{
-	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	int ret;
-	u8 again, dgain;
-
-	if (gain < 0x20)
-		gain = 0x20;
-	if (gain > 0x80)
-		gain = 0x80;
-
-	if (gain >= 0x20 && gain < 0x40) {
-		again = 0x0; /* sqrt(2) */
-		dgain = gain;
-	} else {
-		again = 0x2; /* 2 * sqrt(2) */
-		dgain = gain / 2;
-	}
-
-	dev_dbg(&client->dev, "gain=0x%x again=0x%x dgain=0x%x\n", gain, again, dgain);
-
-	/* set analog gain */
-	ret = i2c_smbus_write_byte_data(client, GC0310_AGC_ADJ, again);
-	if (ret)
-		return ret;
-
-	/* set digital gain */
-	ret = i2c_smbus_write_byte_data(client, GC0310_DGC_ADJ, dgain);
-	if (ret)
-		return ret;
-
-	return 0;
-}
-
-static int __gc0310_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
-				 int gain, int digitgain)
-
-{
-	struct i2c_client *client = v4l2_get_subdevdata(sd);
-	int ret;
-
-	dev_dbg(&client->dev, "coarse_itg=%d gain=%d digitgain=%d\n", coarse_itg, gain, digitgain);
-
-	/* set exposure */
-	ret = i2c_smbus_write_word_swapped(client, GC0310_AEC_PK_EXPO_H, coarse_itg);
-	if (ret)
-		return ret;
-
-	ret = gc0310_set_gain(sd, gain);
-	if (ret)
-		return ret;
-
-	return ret;
-}
-
-static int gc0310_set_exposure(struct v4l2_subdev *sd, int exposure,
-			       int gain, int digitgain)
-{
-	struct gc0310_device *dev = to_gc0310_sensor(sd);
-	int ret;
-
-	mutex_lock(&dev->input_lock);
-	ret = __gc0310_set_exposure(sd, exposure, gain, digitgain);
-	mutex_unlock(&dev->input_lock);
-
-	return ret;
-}
-
-static long gc0310_s_exposure(struct v4l2_subdev *sd,
-			      struct atomisp_exposure *exposure)
-{
-	int exp = exposure->integration_time[0];
-	int gain = exposure->gain[0];
-	int digitgain = exposure->gain[1];
-
-	/* we should not accept the invalid value below. */
-	if (gain == 0) {
-		struct i2c_client *client = v4l2_get_subdevdata(sd);
-
-		v4l2_err(client, "%s: invalid value\n", __func__);
-		return -EINVAL;
-	}
-
-	return gc0310_set_exposure(sd, exp, gain, digitgain);
-}
-
-static long gc0310_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
-{
-	switch (cmd) {
-	case ATOMISP_IOC_S_EXPOSURE:
-		return gc0310_s_exposure(sd, arg);
-	default:
-		return -EINVAL;
-	}
-	return 0;
-}
-
 static int gc0310_s_ctrl(struct v4l2_ctrl *ctrl)
 {
 	int ret = 0;
@@ -627,7 +529,6 @@ static const struct v4l2_subdev_video_ops gc0310_video_ops = {
 
 static const struct v4l2_subdev_core_ops gc0310_core_ops = {
 	.s_power = gc0310_s_power,
-	.ioctl = gc0310_ioctl,
 };
 
 static const struct v4l2_subdev_pad_ops gc0310_pad_ops = {