[media] doc-rst: add documentation for si4713

Convert it to ReST and add it to the media/v4l-drivers book.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/v4l-drivers/si4713.rst

@@ -1,11 +1,16 @@
-Driver for I2C radios for the Silicon Labs Si4713 FM Radio Transmitters
+.. include:: <isonum.txt>
+
+The Silicon Labs Si4713 FM Radio Transmitter Driver
+===================================================
+
+Copyright |copy| 2009 Nokia Corporation
 
-Copyright (c) 2009 Nokia Corporation
 Contact: Eduardo Valentin <eduardo.valentin@nokia.com>
 
 
 Information about the Device
-============================
+----------------------------
+
 This chip is a Silicon Labs product. It is a I2C device, currently on 0x63 address.
 Basically, it has transmission and signal noise level measurement features.
 
@@ -19,7 +24,8 @@ properties which can change the behavior of this chip.
 Users must comply with local regulations on radio frequency (RF) transmission.
 
 Device driver description
-=========================
+-------------------------
+
 There are two modules to handle this device. One is a I2C device driver
 and the other is a platform driver.
 
@@ -37,10 +43,13 @@ etc. But mostly of its properties will be present in the extended controls.
 When the v4l2 mute property is set to 1 (true), the driver will turn the chip off.
 
 Properties description
-======================
+----------------------
 
 The properties can be accessed using v4l2 extended controls.
 Here is an output from v4l2-ctl util:
+
+.. code-block:: none
+
 	/ # v4l2-ctl -d /dev/radio0 --all -L
 	Driver Info:
 		Driver name   : radio-si4713
@@ -84,55 +93,57 @@ audio_compression_feature_enabl (bool) : default=1 value=1
 		pre_emphasis_settings (menu) : min=0 max=2 default=1 value=1
 		tune_power_level (int)  : min=0 max=120 step=1 default=88 value=88 flags=slider
 		tune_antenna_capacitor (int)  : min=0 max=191 step=1 default=0 value=110 flags=slider
-/ #
 
 Here is a summary of them:
 
 * Pilot is an audible tone sent by the device.
 
-pilot_frequency - Configures the frequency of the stereo pilot tone.
+- pilot_frequency - Configures the frequency of the stereo pilot tone.
-pilot_deviation - Configures pilot tone frequency deviation level.
+- pilot_deviation - Configures pilot tone frequency deviation level.
-pilot_enabled - Enables or disables the pilot tone feature.
+- pilot_enabled - Enables or disables the pilot tone feature.
 
-* The si4713 device is capable of applying audio compression to the transmitted signal.
+* The si4713 device is capable of applying audio compression to the
+  transmitted signal.
 
-acomp_enabled - Enables or disables the audio dynamic range control feature.
+- acomp_enabled - Enables or disables the audio dynamic range control feature.
-acomp_gain - Sets the gain for audio dynamic range control.
+- acomp_gain - Sets the gain for audio dynamic range control.
-acomp_threshold - Sets the threshold level for audio dynamic range control.
+- acomp_threshold - Sets the threshold level for audio dynamic range control.
-acomp_attack_time - Sets the attack time for audio dynamic range control.
+- acomp_attack_time - Sets the attack time for audio dynamic range control.
-acomp_release_time - Sets the release time for audio dynamic range control.
+- acomp_release_time - Sets the release time for audio dynamic range control.
 
 * Limiter setups audio deviation limiter feature. Once a over deviation occurs,
   it is possible to adjust the front-end gain of the audio input and always
   prevent over deviation.
 
-limiter_enabled - Enables or disables the limiter feature.
+- limiter_enabled - Enables or disables the limiter feature.
-limiter_deviation - Configures audio frequency deviation level.
+- limiter_deviation - Configures audio frequency deviation level.
-limiter_release_time - Sets the limiter release time.
+- limiter_release_time - Sets the limiter release time.
 
 * Tuning power
 
-power_level - Sets the output power level for signal transmission.
+- power_level - Sets the output power level for signal transmission.
-antenna_capacitor - This selects the value of antenna tuning capacitor manually
+  antenna_capacitor - This selects the value of antenna tuning capacitor
-or automatically if set to zero.
+  manually or automatically if set to zero.
 
 * RDS related
 
-rds_ps_name - Sets the RDS ps name field for transmission.
+- rds_ps_name - Sets the RDS ps name field for transmission.
-rds_radio_text - Sets the RDS radio text for transmission.
+- rds_radio_text - Sets the RDS radio text for transmission.
-rds_pi - Sets the RDS PI field for transmission.
+- rds_pi - Sets the RDS PI field for transmission.
-rds_pty - Sets the RDS PTY field for transmission.
+- rds_pty - Sets the RDS PTY field for transmission.
 
 * Region related
 
-preemphasis - sets the preemphasis to be applied for transmission.
+- preemphasis - sets the preemphasis to be applied for transmission.
 
 RNL
-===
+---
 
 This device also has an interface to measure received noise level. To do that, you should
 ioctl the device node. Here is an code of example:
 
+.. code-block:: none
+
 	int main (int argc, char *argv[])
 	{
 		struct si4713_rnl rnl;
@@ -160,17 +171,20 @@ The struct si4713_rnl and SI4713_IOC_MEASURE_RNL are defined under
 include/linux/platform_data/media/si4713.h.
 
 Stereo/Mono and RDS subchannels
-===============================
+-------------------------------
 
 The device can also be configured using the available sub channels for
 transmission. To do that use S/G_MODULATOR ioctl and configure txsubchans properly.
 Refer to the V4L2 API specification for proper use of this ioctl.
 
 Testing
-=======
+-------
 Testing is usually done with v4l2-ctl utility for managing FM tuner cards.
 The tool can be found in v4l-dvb repository under v4l2-apps/util directory.
 
 Example for setting rds ps name:
+
+.. code-block:: none
+
 	# v4l2-ctl -d /dev/radio0 --set-ctrl=rds_ps_name="Dummy"