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Commit b879a9c2 authored by Andrey Smirnov's avatar Andrey Smirnov Committed by Mauro Carvalho Chehab
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[media] v4l2: Add a V4L2 driver for SI476X MFD 



This commit adds a driver that exposes all the radio related
functionality of the Si476x series of chips via the V4L2 subsystem.

[mchehab@redhat.com: change it to depends on MFD_SI476X_CORE instead of
 selecting it; vidioc_s_register now uses const struct]
Acked-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarAndrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 6695be68

Documentation/video4linux/si476x.txt

0 → 100644
+187 −0
Original line number Diff line number Diff line 
SI476x Driver Readme

------------------------------------------------

	Copyright (C) 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	| Singed 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		| Adjascent 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.

drivers/media/radio/Kconfig

+16 −0
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@@ -18,6 +18,22 @@ config RADIO_SI470X 


source "drivers/media/radio/si470x/Kconfig"



config RADIO_SI476X

	tristate "Silicon Laboratories Si476x I2C FM Radio"

	depends on I2C && VIDEO_V4L2

	depends on MFD_SI476X_CORE

	select SND_SOC_SI476X

	---help---

	  Choose Y here if you have this FM radio chip.



	  In order to control your radio card, you will need to use programs

	  that are compatible with the Video For Linux 2 API.  Information on

	  this API and pointers to "v4l2" programs may be found at

	  <file:Documentation/video4linux/API.html>.



	  To compile this driver as a module, choose M here: the

	  module will be called radio-si476x.



config USB_MR800

	tristate "AverMedia MR 800 USB FM radio support"

	depends on USB && VIDEO_V4L2

drivers/media/radio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ obj-$(CONFIG_RADIO_GEMTEK) += radio-gemtek.o 
obj-$(CONFIG_RADIO_TRUST) += radio-trust.o

obj-$(CONFIG_I2C_SI4713) += si4713-i2c.o

obj-$(CONFIG_RADIO_SI4713) += radio-si4713.o

obj-$(CONFIG_RADIO_SI476X) += radio-si476x.o

obj-$(CONFIG_RADIO_MIROPCM20) += radio-miropcm20.o

obj-$(CONFIG_USB_DSBR) += dsbr100.o

obj-$(CONFIG_RADIO_SI470X) += si470x/