[media] pwc: Add v4l2 controls for pan/tilt on Logitech QuickCam Orbit/Sphere

This makes the API for this:
1) v4l2 spec compliant
2) match that of the UVC Logitech QuickCam Sphere models

For now this operates in parellel to the sysfs interface for this, but the
intend is to deprecate the sysfs interface and remove it.

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

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/media/video/pwc/pwc-v4l.c b/drivers/media/video/pwc/pwc-v4l.c
index 537657283e79..e9a0e94b9995 100644
--- a/drivers/media/video/pwc/pwc-v4l.c
+++ b/drivers/media/video/pwc/pwc-v4l.c
@@ -338,6 +338,22 @@ int pwc_init_controls(struct pwc_device *pdev)
 	if (pdev->restore_factory)
 		pdev->restore_factory->flags = V4L2_CTRL_FLAG_UPDATE;
 
+	if (!pdev->features & FEATURE_MOTOR_PANTILT)
+		return hdl->error;
+
+	/* Motor pan / tilt / reset */
+	pdev->motor_pan = v4l2_ctrl_new_std(hdl, &pwc_ctrl_ops,
+				V4L2_CID_PAN_RELATIVE, -4480, 4480, 64, 0);
+	if (!pdev->motor_pan)
+		return hdl->error;
+	pdev->motor_tilt = v4l2_ctrl_new_std(hdl, &pwc_ctrl_ops,
+				V4L2_CID_TILT_RELATIVE, -1920, 1920, 64, 0);
+	pdev->motor_pan_reset = v4l2_ctrl_new_std(hdl, &pwc_ctrl_ops,
+				V4L2_CID_PAN_RESET, 0, 0, 0, 0);
+	pdev->motor_tilt_reset = v4l2_ctrl_new_std(hdl, &pwc_ctrl_ops,
+				V4L2_CID_TILT_RESET, 0, 0, 0, 0);
+	v4l2_ctrl_cluster(4, &pdev->motor_pan);
+
 	return hdl->error;
 }
 
@@ -764,6 +780,43 @@ static int pwc_set_autogain_expo(struct pwc_device *pdev)
 	return ret;
 }
 
+static int pwc_set_motor(struct pwc_device *pdev)
+{
+	int ret;
+	u8 buf[4];
+
+	buf[0] = 0;
+	if (pdev->motor_pan_reset->is_new)
+		buf[0] |= 0x01;
+	if (pdev->motor_tilt_reset->is_new)
+		buf[0] |= 0x02;
+	if (pdev->motor_pan_reset->is_new || pdev->motor_tilt_reset->is_new) {
+		ret = send_control_msg(pdev, SET_MPT_CTL,
+				       PT_RESET_CONTROL_FORMATTER, buf, 1);
+		if (ret < 0)
+			return ret;
+	}
+
+	memset(buf, 0, sizeof(buf));
+	if (pdev->motor_pan->is_new) {
+		buf[0] = pdev->motor_pan->val & 0xFF;
+		buf[1] = (pdev->motor_pan->val >> 8);
+	}
+	if (pdev->motor_tilt->is_new) {
+		buf[2] = pdev->motor_tilt->val & 0xFF;
+		buf[3] = (pdev->motor_tilt->val >> 8);
+	}
+	if (pdev->motor_pan->is_new || pdev->motor_tilt->is_new) {
+		ret = send_control_msg(pdev, SET_MPT_CTL,
+				       PT_RELATIVE_CONTROL_FORMATTER,
+				       buf, sizeof(buf));
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
 static int pwc_s_ctrl(struct v4l2_ctrl *ctrl)
 {
 	struct pwc_device *pdev =
@@ -859,6 +912,9 @@ static int pwc_s_ctrl(struct v4l2_ctrl *ctrl)
 		ret = pwc_button_ctrl(pdev,
 				      RESTORE_FACTORY_DEFAULTS_FORMATTER);
 		break;
+	case V4L2_CID_PAN_RELATIVE:
+		ret = pwc_set_motor(pdev);
+		break;
 	default:
 		ret = -EINVAL;
 	}