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+.. include:: <isonum.txt>
+
+
+The SI476x Driver
+=================
+
+Copyright |copy| 2013 Andrey Smirnov <andrew.smirnov@gmail.com>
+
+TODO for the driver
+-------------------
+
+- According to the SiLabs' datasheet it is possible to update the
+  firmware of the radio chip in the run-time, thus bringing it to the
+  most recent version. Unfortunately I couldn't find any mentioning of
+  the said firmware update for the old chips that I tested the driver
+  against, so for chips like that the driver only exposes the old
+  functionality.
+
+
+Parameters exposed over debugfs
+-------------------------------
+SI476x allow user to get multiple characteristics that can be very
+useful for EoL testing/RF performance estimation, parameters that have
+very little to do with V4L2 subsystem. Such parameters are exposed via
+debugfs and can be accessed via regular file I/O operations.
+
+The drivers exposes following files:
+
+* /sys/kernel/debug/<device-name>/acf
+  This file contains ACF(Automatically Controlled Features) status
+  information. The contents of the file is binary data of the
+  following layout:
+
+  =============  ==============   ====================================
+  Offset	  Name		  Description
+  =============  ==============   ====================================
+  0x00		  blend_int	  Flag, set when stereo separation has
+				  crossed below the blend threshold
+  0x01		  hblend_int	  Flag, set when HiBlend cutoff
+				  frequency is lower than threshold
+  0x02		  hicut_int	  Flag, set when HiCut cutoff
+				  frequency is lower than threshold
+  0x03		  chbw_int	  Flag, set when channel filter
+				  bandwidth is less than threshold
+  0x04		  softmute_int	  Flag indicating that softmute
+				  attenuation has increased above
+				  softmute threshold
+  0x05		 smute		  0 - Audio is not soft muted
+				  1 - Audio is soft muted
+  0x06		  smattn	  Soft mute attenuation level in dB
+  0x07		  chbw		  Channel filter bandwidth in kHz
+  0x08		  hicut		  HiCut cutoff frequency in units of
+				  100Hz
+  0x09		  hiblend	  HiBlend cutoff frequency in units
+				  of 100 Hz
+  0x10		  pilot		  0 - Stereo pilot is not present
+				  1 - Stereo pilot is present
+  0x11		  stblend	  Stereo blend in %
+  =============  ==============   ====================================
+
+
+* /sys/kernel/debug/<device-name>/rds_blckcnt
+  This file contains statistics about RDS receptions. It's binary data
+  has the following layout:
+
+  =============  ==============   ====================================
+  Offset	  Name		  Description
+  =============  ==============   ====================================
+  0x00		  expected	  Number of expected RDS blocks
+  0x02		  received	  Number of received RDS blocks
+  0x04		  uncorrectable	  Number of uncorrectable RDS blocks
+  =============  ==============   ====================================
+
+* /sys/kernel/debug/<device-name>/agc
+  This file contains information about parameters pertaining to
+  AGC(Automatic Gain Control)
+
+  The layout is:
+
+  =============  ==============   ====================================
+  Offset	  Name		  Description
+  =============  ==============   ====================================
+  0x00		  mxhi		  0 - FM Mixer PD high threshold is
+				  not tripped
+				  1 - FM Mixer PD high threshold is
+				  tripped
+  0x01		  mxlo		  ditto for FM Mixer PD low
+  0x02		  lnahi		  ditto for FM LNA PD high
+  0x03		  lnalo		  ditto for FM LNA PD low
+  0x04		  fmagc1	  FMAGC1 attenuator resistance
+				  (see datasheet for more detail)
+  0x05		  fmagc2	  ditto for FMAGC2
+  0x06		  pgagain	  PGA gain in dB
+  0x07		  fmwblang	  FM/WB LNA Gain in dB
+  =============  ==============   ====================================
+
+* /sys/kernel/debug/<device-name>/rsq
+  This file contains information about parameters pertaining to
+  RSQ(Received Signal Quality)
+
+  The layout is:
+
+  =============  ==============   ====================================
+  Offset	  Name		  Description
+  =============  ==============   ====================================
+  0x00		  multhint	  0 - multipath value has not crossed
+				  the Multipath high threshold
+				  1 - multipath value has crossed
+				  the Multipath high threshold
+  0x01		  multlint	  ditto for Multipath low threshold
+  0x02		  snrhint	  0 - received signal's SNR has not
+				  crossed high threshold
+				  1 - received signal's SNR has
+				  crossed high threshold
+  0x03		  snrlint	  ditto for low threshold
+  0x04		  rssihint	  ditto for RSSI high threshold
+  0x05		  rssilint	  ditto for RSSI low threshold
+  0x06		  bltf		  Flag indicating if seek command
+				  reached/wrapped seek band limit
+  0x07		  snr_ready	  Indicates that SNR metrics is ready
+  0x08		  rssiready	  ditto for RSSI metrics
+  0x09		  injside	  0 - Low-side injection is being used
+				  1 - High-side injection is used
+  0x10		  afcrl		  Flag indicating if AFC rails
+  0x11		  valid		  Flag indicating if channel is valid
+  0x12		  readfreq	  Current tuned frequency
+  0x14		  freqoff	  Signed frequency offset in units of
+				  2ppm
+  0x15		  rssi		  Signed value of RSSI in dBuV
+  0x16		  snr		  Signed RF SNR in dB
+  0x17		  issi		  Signed Image Strength Signal
+				  indicator
+  0x18		  lassi		  Signed Low side adjacent Channel
+				  Strength indicator
+  0x19		  hassi		  ditto fpr High side
+  0x20		  mult		  Multipath indicator
+  0x21		  dev		  Frequency deviation
+  0x24		  assi		  Adjacent channel SSI
+  0x25		  usn		  Ultrasonic noise indicator
+  0x26		  pilotdev	  Pilot deviation in units of 100 Hz
+  0x27		  rdsdev	  ditto for RDS
+  0x28		  assidev	  ditto for ASSI
+  0x29		  strongdev	  Frequency deviation
+  0x30		  rdspi		  RDS PI code
+  =============  ==============   ====================================
+
+* /sys/kernel/debug/<device-name>/rsq_primary
+  This file contains information about parameters pertaining to
+  RSQ(Received Signal Quality) for primary tuner only. Layout is as
+  the one above.