path: root/Documentation
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authorLinus Torvalds <>2008-11-11 09:25:21 -0800
committerLinus Torvalds <>2008-11-11 09:25:21 -0800
commit853041f0899177da7a47da3a09aa327a14ebd7bb (patch)
tree0db5619b95dbb95aa9dfd3cdea5416d87b7590a6 /Documentation
parente892873c5d7431324d98dfd3ed1572a2948046be (diff)
parent1d6782bda5c1fb2bca44af50647b45427d8ef4ec (diff)
Merge branch 'for_linus' of git://
* 'for_linus' of git:// (35 commits) V4L/DVB (9516): cx18: Move DVB buffer transfer handling from irq handler to work_queue V4L/DVB (9557): gspca: Small changes for the sensor HV7131B in zc3xx. V4L/DVB (9556): gspca: Bad init sequence for sensor HV7131B in zc3xx. V4L/DVB (9549): gspca: Fix a typo in one of gspca chips name. V4L/DVB (9515): cx18: Use correct Mailbox IRQ Ack values and misc IRQ handling cleanup V4L/DVB (9493): kconfig patch V4L/DVB (9527): af9015: fix compile warnings V4L/DVB (9524): af9013: fix bug in status reading V4L/DVB (9511): cx18: Mark CX18_CPU_DE_RELEASE_MDL as a slow API call V4L/DVB (9510): cx18: Fix write retries for registers that always change - part 2. V4L/DVB (9506): ivtv/cx18: fix test whether modules should be loaded or not. V4L/DVB (9499): cx88-mpeg: final fix for analogue only compilation + de-alloc fix V4L/DVB (9496): cx88-blackbird: bugfix: cx88-blackbird-mpeg-users V4L/DVB (9495): cx88-blackbird: bugfix: cx88-blackbird-poll-fix V4L/DVB (9494): anysee: initialize anysee_usb_mutex statically V4L/DVB (9492): unplug oops from dvb_frontend_init... V4L/DVB (9486): ivtv/ivtvfb: no longer experimental V4L/DVB (9485): ivtv: remove incorrect V4L1 & tvaudio dependency V4L/DVB (9482): Documentation, especially regarding audio and informational links V4L/DVB (9475): cx18: Disable write retries for registers that always change - part 1. ...
Diffstat (limited to 'Documentation')
3 files changed, 120 insertions, 26 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 05d71b4b9430..c28a2ac88f9d 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -56,30 +56,6 @@ Who: Mauro Carvalho Chehab <>
-What: old tuner-3036 i2c driver
-When: 2.6.28
-Why: This driver is for VERY old i2c-over-parallel port teletext receiver
- boxes. Rather then spending effort on converting this driver to V4L2,
- and since it is extremely unlikely that anyone still uses one of these
- devices, it was decided to drop it.
-Who: Hans Verkuil <>
- Mauro Carvalho Chehab <>
- ---------------------------
-What: V4L2 dpc7146 driver
-When: 2.6.28
-Why: Old driver for the dpc7146 demonstration board that is no longer
- relevant. The last time this was tested on actual hardware was
- probably around 2002. Since this is a driver for a demonstration
- board the decision was made to remove it rather than spending a
- lot of effort continually updating this driver to stay in sync
- with the latest internal V4L2 or I2C API.
-Who: Hans Verkuil <>
- Mauro Carvalho Chehab <>
What: PCMCIA control ioctl (needed for pcmcia-cs [cardmgr, cardctl])
When: November 2005
Files: drivers/pcmcia/: pcmcia_ioctl.c
diff --git a/Documentation/video4linux/README.cx88 b/Documentation/video4linux/README.cx88
index 06a33a4f52fd..166d5960b1a9 100644
--- a/Documentation/video4linux/README.cx88
+++ b/Documentation/video4linux/README.cx88
@@ -27,8 +27,8 @@ audio
sound card) should be possible, but there is no code yet ...
- - some code present. Doesn't crash any more, but also doesn't
- work yet ...
+ - Code present. Works for NTSC closed caption. PAL and other
+ TV norms may or may not work.
how to add support for new cards
diff --git a/Documentation/video4linux/si470x.txt b/Documentation/video4linux/si470x.txt
new file mode 100644
index 000000000000..11c5fd22a332
--- /dev/null
+++ b/Documentation/video4linux/si470x.txt
@@ -0,0 +1,118 @@
+Driver for USB radios for the Silicon Labs Si470x FM Radio Receivers
+Copyright (c) 2008 Tobias Lorenz <>
+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:
+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:
+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)
+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
+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:
+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
+If you just want to test audio (very poor quality):
+cat /dev/dsp1 > /dev/dsp
+If you use OSS try:
+sox -2 --endian little -r 96000 -t oss /dev/dsp1 -t oss /dev/dsp
+If you use arts try:
+arecord -D hw:1,0 -r96000 -c2 -f S16_LE | artsdsp aplay -B -
+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.
+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