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diff --git a/Documentation/video4linux/si470x.txt b/Documentation/video4linux/si470x.txt deleted file mode 100644 index 98c32925e..000000000 --- a/Documentation/video4linux/si470x.txt +++ /dev/null @@ -1,129 +0,0 @@ -Driver for USB radios for the Silicon Labs Si470x FM Radio Receivers - -Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net> - - -Information from Silicon Labs -============================= -Silicon Laboratories is the manufacturer of the radio ICs, that nowadays are the -most often used radio receivers in cell phones. Usually they are connected with -I2C. But SiLabs also provides a reference design, which integrates this IC, -together with a small microcontroller C8051F321, to form a USB radio. -Part of this reference design is also a radio application in binary and source -code. The software also contains an automatic firmware upgrade to the most -current version. Information on these can be downloaded here: -http://www.silabs.com/usbradio - - -Supported ICs -============= -The following ICs have a very similar register set, so that they are or will be -supported somewhen by the driver: -- Si4700: FM radio receiver -- Si4701: FM radio receiver, RDS Support -- Si4702: FM radio receiver -- Si4703: FM radio receiver, RDS Support -- Si4704: FM radio receiver, no external antenna required -- Si4705: FM radio receiver, no external antenna required, RDS support, Dig I/O -- Si4706: Enhanced FM RDS/TMC radio receiver, no external antenna required, RDS - Support -- Si4707: Dedicated weather band radio receiver with SAME decoder, RDS Support -- Si4708: Smallest FM receivers -- Si4709: Smallest FM receivers, RDS Support -More information on these can be downloaded here: -http://www.silabs.com/products/mcu/Pages/USBFMRadioRD.aspx - - -Supported USB devices -===================== -Currently the following USB radios (vendor:product) with the Silicon Labs si470x -chips are known to work: -- 10c4:818a: Silicon Labs USB FM Radio Reference Design -- 06e1:a155: ADS/Tech FM Radio Receiver (formerly Instant FM Music) (RDX-155-EF) -- 1b80:d700: KWorld USB FM Radio SnapMusic Mobile 700 (FM700) -- 10c5:819a: Sanei Electric, Inc. FM USB Radio (sold as DealExtreme.com PCear) - - -Software -======== -Testing is usually done with most application under Debian/testing: -- fmtools - Utility for managing FM tuner cards -- gnomeradio - FM-radio tuner for the GNOME desktop -- gradio - GTK FM radio tuner -- kradio - Comfortable Radio Application for KDE -- radio - ncurses-based radio application -- mplayer - The Ultimate Movie Player For Linux -- v4l2-ctl - Collection of command line video4linux utilities -For example, you can use: -v4l2-ctl -d /dev/radio0 --set-ctrl=volume=10,mute=0 --set-freq=95.21 --all - -There is also a library libv4l, which can be used. It's going to have a function -for frequency seeking, either by using hardware functionality as in radio-si470x -or by implementing a function as we currently have in every of the mentioned -programs. Somewhen the radio programs should make use of libv4l. - -For processing RDS information, there is a project ongoing at: -http://rdsd.berlios.de/ - -There is currently no project for making TMC sentences human readable. - - -Audio Listing -============= -USB Audio is provided by the ALSA snd_usb_audio module. It is recommended to -also select SND_USB_AUDIO, as this is required to get sound from the radio. For -listing you have to redirect the sound, for example using one of the following -commands. Please adjust the audio devices to your needs (/dev/dsp* and hw:x,x). - -If you just want to test audio (very poor quality): -cat /dev/dsp1 > /dev/dsp - -If you use sox + OSS try: -sox -2 --endian little -r 96000 -t oss /dev/dsp1 -t oss /dev/dsp -or using sox + alsa: -sox --endian little -c 2 -S -r 96000 -t alsa hw:1 -t alsa -r 96000 hw:0 - -If you use arts try: -arecord -D hw:1,0 -r96000 -c2 -f S16_LE | artsdsp aplay -B - - -If you use mplayer try: -mplayer -radio adevice=hw=1.0:arate=96000 \ - -rawaudio rate=96000 \ - radio://<frequency>/capture - -Module Parameters -================= -After loading the module, you still have access to some of them in the sysfs -mount under /sys/module/radio_si470x/parameters. The contents of read-only files -(0444) are not updated, even if space, band and de are changed using private -video controls. The others are runtime changeable. - - -Errors -====== -Increase tune_timeout, if you often get -EIO errors. - -When timed out or band limit is reached, hw_freq_seek returns -EAGAIN. - -If you get any errors from snd_usb_audio, please report them to the ALSA people. - - -Open Issues -=========== -V4L minor device allocation and parameter setting is not perfect. A solution is -currently under discussion. - -There is an USB interface for downloading/uploading new firmware images. Support -for it can be implemented using the request_firmware interface. - -There is a RDS interrupt mode. The driver is already using the same interface -for polling RDS information, but is currently not using the interrupt mode. - -There is a LED interface, which can be used to override the LED control -programmed in the firmware. This can be made available using the LED support -functions in the kernel. - - -Other useful information and links -================================== -http://www.silabs.com/usbradio |