[media] Docbook: Document struct analog_parameters

That struct inside dvb-frontend.h stores some parameters
from V4L2 API (videodev2.h), in order to be used by the
hybrid analog/digital TV tuners.

Document it.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: NJonathan Corbet <corbet@lwn.net>

drivers/media/dvb-core/dvb_frontend.h

@@ -91,6 +91,20 @@ struct dvb_tuner_info {
 	u32 bandwidth_step;
 };
 
+/**
+ * struct analog_parameters - Parameters to tune into an analog/radio channel
+ *
+ * @frequency:	Frequency used by analog TV tuner (either in 62.5 kHz step,
+ * 		for TV, or 62.5 Hz for radio)
+ * @mode:	Tuner mode, as defined on enum v4l2_tuner_type
+ * @audmode:	Audio mode as defined for the rxsubchans field at videodev2.h,
+ * 		e. g. V4L2_TUNER_MODE_*
+ * @std:	TV standard bitmap as defined at videodev2.h, e. g. V4L2_STD_*
+ *
+ * Hybrid tuners should be supported by both V4L2 and DVB APIs. This
+ * struct contains the data that are used by the V4L2 side. To avoid
+ * dependencies from V4L2 headers, all enums here are declared as integers.
+ */
 struct analog_parameters {
 	unsigned int frequency;
 	unsigned int mode;
@@ -111,16 +125,16 @@ enum tuner_param {
 /**
  * enum dvbfe_algo - defines the algorithm used to tune into a channel
  *
- * @DVBFE_ALGO_HW: (Hardware Algorithm)
+ * @DVBFE_ALGO_HW: Hardware Algorithm -
  *	Devices that support this algorithm do everything in hardware
  *	and no software support is needed to handle them.
  *	Requesting these devices to LOCK is the only thing required,
  *	device is supposed to do everything in the hardware.
  *
- * @DVBFE_ALGO_SW: (Software Algorithm)
+ * @DVBFE_ALGO_SW: Software Algorithm -
  * These are dumb devices, that require software to do everything
  *
- * @DVBFE_ALGO_CUSTOM: (Customizable Agorithm)
+ * @DVBFE_ALGO_CUSTOM: Customizable Agorithm -
  *	Devices having this algorithm can be customized to have specific
  *	algorithms in the frontend driver, rather than simply doing a
  *	software zig-zag. In this case the zigzag maybe hardware assisted
@@ -128,7 +142,7 @@ enum tuner_param {
  *	this algorithm, in conjunction with the search and track
  *	callbacks, utilizes the driver specific algorithm.
  *
- * @DVBFE_ALGO_RECOVERY: (Recovery Algorithm)
+ * @DVBFE_ALGO_RECOVERY: Recovery Algorithm -
  *	These devices have AUTO recovery capabilities from LOCK failure
  */
 enum dvbfe_algo {