Silicon Integrated Input Devices Driver Download

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Silicon Integrated Input Devices Driver Download

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25.1. 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.

The Si4713 integrates transmit functions for FM broadcast stereo transmission.The chip also allows integrated receive power scanning to identify low signalpower FM channels.

The chip is programmed using commands and responses. There are also severalproperties which can change the behavior of this chip.

Users must comply with local regulations on radio frequency (RF) transmission.

25.2. Device driver description¶

There are two modules to handle this device. One is a I2C device driverand the other is a platform driver.

The I2C device driver exports a v4l2-subdev interface to the kernel.All properties can also be accessed by v4l2 extended controls interface, byusing the v4l2-subdev calls (g_ext_ctrls, s_ext_ctrls).

The platform device driver exports a v4l2 radio device interface to user land.So, it uses the I2C device driver as a sub device in order to send the usercommands to the actual device. Basically it is a wrapper to the I2C device driver.

Applications can use v4l2 radio API to specify frequency of operation, mute state,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.

25.3. Properties description¶

The properties can be accessed using v4l2 extended controls.Here is an output from v4l2-ctl util:

Mapper

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_deviation - Configures pilot tone frequency deviation level.
  • pilot_enabled - Enables or disables the pilot tone feature.
  • The si4713 device is capable of applying audio compression to thetransmitted signal.
  • acomp_enabled - Enables or disables the audio dynamic range control feature.
  • acomp_gain - Sets the gain 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_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 alwaysprevent over deviation.
  • limiter_enabled - Enables or disables the limiter feature.
  • limiter_deviation - Configures audio frequency deviation level.
  • limiter_release_time - Sets the limiter release time.
  • Tuning power
  • power_level - Sets the output power level for signal transmission.antenna_capacitor - This selects the value of antenna tuning capacitormanually or automatically if set to zero.
  • RDS related
  • rds_ps_name - Sets the RDS ps name field for transmission.
  • rds_radio_text - Sets the RDS radio text for transmission.
  • rds_pi - Sets the RDS PI field for transmission.
  • rds_pty - Sets the RDS PTY field for transmission.
  • Region related
  • preemphasis - sets the preemphasis to be applied for transmission.

Output Devices Of Computer

25.4. RNL¶

This device also has an interface to measure received noise level. To do that, you shouldioctl the device node. Here is an code of example:

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The struct si4713_rnl and SI4713_IOC_MEASURE_RNL are defined underinclude/linux/platform_data/media/si4713.h.

25.5. Stereo/Mono and RDS subchannels¶

The device can also be configured using the available sub channels fortransmission. To do that use S/G_MODULATOR ioctl and configure txsubchans properly.Refer to the V4L2 API specification for proper use of this ioctl.

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25.6. Testing¶

Input Devices Of Computer

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.

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Example for setting rds ps name: