[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>

drivers/media/video/pwc/pwc-ctrl.c

@@ -165,7 +165,7 @@ static inline int send_video_command(struct pwc_device *pdev,
 		buf, buflen);
 }
 
-static inline int send_control_msg(struct pwc_device *pdev,
+int send_control_msg(struct pwc_device *pdev,
 	u8 request, u16 value, void *buf, int buflen)
 {
 	return _send_control_msg(pdev,

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;
 	}

drivers/media/video/pwc/pwc.h

@@ -326,6 +326,13 @@ struct pwc_device
 	struct v4l2_ctrl		*save_user;
 	struct v4l2_ctrl		*restore_user;
 	struct v4l2_ctrl		*restore_factory;
+	struct {
+		/* motor control cluster */
+		struct v4l2_ctrl	*motor_pan;
+		struct v4l2_ctrl	*motor_tilt;
+		struct v4l2_ctrl	*motor_pan_reset;
+		struct v4l2_ctrl	*motor_tilt_reset;
+	};
 	/* CODEC3 models have both gain and exposure controlled by autogain */
 	struct v4l2_ctrl		*autogain_expo_cluster[3];
 };
@@ -350,6 +357,8 @@ extern int pwc_mpt_reset(struct pwc_device *pdev, int flags);
 extern int pwc_mpt_set_angle(struct pwc_device *pdev, int pan, int tilt);
 extern int pwc_set_leds(struct pwc_device *pdev, int on_value, int off_value);
 extern int pwc_get_cmos_sensor(struct pwc_device *pdev, int *sensor);
+extern int send_control_msg(struct pwc_device *pdev,
+			    u8 request, u16 value, void *buf, int buflen);
 
 /* Control get / set helpers */
 int pwc_get_u8_ctrl(struct pwc_device *pdev, u8 request, u16 value, int *data);