[media] doc-rst: add documentation for radiotrack (6286d2b1) · Commits · e / devices / android_kernel_fairphone_FP4

Documentation/media/v4l-drivers/index.rst

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		@@ -32,4 +32,5 @@ License".
		omap4_camera
		pvrusb2
		pxa_camera
		radiotrack
		zr364xx

Documentation/media/v4l-drivers/radiotrack.rst

+99 −80

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		NOTES ON RADIOTRACK CARD CONTROL
		by Stephen M. Benoit (benoits@servicepro.com) Dec 14, 1996
		----------------------------------------------------------------------------
		The Radiotrack radio driver
		===========================

		Document version 1.0
		Author: Stephen M. Benoit <benoits@servicepro.com>

		Date: Dec 14, 1996

		ACKNOWLEDGMENTS
		----------------

		This document was made based on 'C' code for Linux from Gideon le Grange
		(legrang@active.co.za or legrang@cs.sun.ac.za) in 1994, and elaborations from
		Frans Brinkman (brinkman@esd.nl) in 1996. The results reported here are from
		@@ -18,6 +20,7 @@ want to use the RadioTrack card in an environment other than MS Windows.

		WHY THIS DOCUMENT?
		------------------

		I have a RadioTrack card from back when I ran an MS-Windows platform. After
		converting to Linux, I found Gideon le Grange's command-line software for
		running the card, and found that it was good! Frans Brinkman made a
		@@ -33,6 +36,7 @@ So, without further delay, here are the details.

		PHYSICAL DESCRIPTION
		--------------------

		The RadioTrack card is an ISA 8-bit FM radio card. The radio frequency (RF)
		input is simply an antenna lead, and the output is a power audio signal
		available through a miniature phone plug. Its RF frequencies of operation are
		@@ -46,6 +50,7 @@ gets clipped beyond the limits mentioned above.

		CONTROLLING THE CARD WITH IOPORT
		--------------------------------

		The RadioTrack (base) ioport is configurable for 0x30c or 0x20c. Only one
		ioport seems to be involved. The ioport decoding circuitry must be pretty
		simple, as individual ioport bits are directly matched to specific functions
		@@ -55,6 +60,8 @@ the ioports appears to be the "Stereo Detect" bit.

		The bits of the ioport are arranged as follows:

		.. code-block:: none

		MSb LSb
		+------+------+------+--------+--------+-------+---------+--------+
		\| VolA \| VolB \| ???? \| Stereo \| Radio \| TuneA \| TuneB \| Tune \|
		@@ -63,46 +70,60 @@ The bits of the ioport are arranged as follows:
		+------+------+------+--------+--------+-------+---------+--------+


		VolA . VolB [AB......]
		-----------
		0 0 : audio mute
		0 1 : volume + (some delay required)
		1 0 : volume - (some delay required)
		1 1 : stay at present volume
		==== ==== =================================
		VolA VolB Description
		==== ==== =================================
		0 0 audio mute
		0 1 volume + (some delay required)
		1 0 volume - (some delay required)
		1 1 stay at present volume
		==== ==== =================================

		Stereo Detect Enable [...S....]
		--------------------
		0 : No Detect
		1 : Detect
		==================== ===========
		Stereo Detect Enable Description
		==================== ===========
		0 No Detect
		1 Detect
		==================== ===========

		Results available by reading ioport >60 msec after last port write.

		0xff ==> no stereo detected, 0xfd ==> stereo detected.

		Radio to Audio (path) Enable [....R...]
		----------------------------
		0 : Disable path (silence)
		1 : Enable path (audio produced)
		============================= =============================
		Radio to Audio (path) Enable Description
		============================= =============================
		0 Disable path (silence)
		1 Enable path (audio produced)
		============================= =============================

		TuneA . TuneB [.....AB.]
		-------------
		0 0 : "zero" bit phase 1
		0 1 : "zero" bit phase 2
		===== ===== ==================
		TuneA TuneB Description
		===== ===== ==================
		0 0 "zero" bit phase 1
		0 1 "zero" bit phase 2
		1 0 "one" bit phase 1
		1 1 "one" bit phase 2
		===== ===== ==================

		1 0 : "one" bit phase 1
		1 1 : "one" bit phase 2

		24-bit code, where bits = (freq*40) + 10486188.
		The Most Significant 11 bits must be 1010 xxxx 0x0 to be valid.
		The bits are shifted in LSb first.

		Tune Update Enable [.......T]
		------------------
		0 : Tuner held constant
		1 : Tuner updating in progress
		================== ===========================
		Tune Update Enable Description
		================== ===========================
		0 Tuner held constant
		1 Tuner updating in progress
		================== ===========================


		PROGRAMMING EXAMPLES
		--------------------

		.. code-block:: none

		Default: BASE <-- 0xc8 (current volume, no stereo detect,
		radio enable, tuner adjust disable)

		@@ -114,17 +135,17 @@ Card On: BASE <-- 0x00 (see "Card Off", clears any unfinished business)

		Volume Down: BASE <-- 0x48 (volume down, no stereo detect,
		radio enable, tuner adjust disable)
		* wait 10 msec *
		wait 10 msec
		BASE <-- 0xc8 (see "Default")

		Volume Up: BASE <-- 0x88 (volume up, no stereo detect,
		radio enable, tuner adjust disable)
		* wait 10 msec *
		wait 10 msec
		BASE <-- 0xc8 (see "Default")

		Check Stereo: BASE <-- 0xd8 (current volume, stereo detect,
		radio enable, tuner adjust disable)
		* wait 100 msec *
		wait 100 msec
		x <-- BASE (read ioport)
		BASE <-- 0xc8 (see "Default")

		@@ -143,5 +164,3 @@ Set Frequency: code = (freq*40) + 10486188
		disable, "one" bit phase 1, tuner adjust)
		BASE <-- 0x07 (audio mute, no stereo detect, radio
		disable, "one" bit phase 2, tuner adjust)

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