diff options
Diffstat (limited to 'linux/Documentation')
| -rw-r--r-- | linux/Documentation/Docbook/Makefile | 248 | ||||
| -rwxr-xr-x | linux/Documentation/dvb/get_dvb_firmware | 37 | ||||
| -rw-r--r-- | linux/Documentation/video4linux/CARDLIST.em28xx | 3 | ||||
| -rw-r--r-- | linux/Documentation/video4linux/CARDLIST.saa7134 | 4 | ||||
| -rw-r--r-- | linux/Documentation/video4linux/gspca.txt | 2 | ||||
| -rw-r--r-- | linux/Documentation/video4linux/si4713.txt | 176 | ||||
| -rw-r--r-- | linux/Documentation/video4linux/soc-camera.txt | 40 | ||||
| -rw-r--r-- | linux/Documentation/video4linux/v4l2-framework.txt | 61 |
8 files changed, 538 insertions, 33 deletions
diff --git a/linux/Documentation/Docbook/Makefile b/linux/Documentation/Docbook/Makefile new file mode 100644 index 000000000..ad07875fe --- /dev/null +++ b/linux/Documentation/Docbook/Makefile @@ -0,0 +1,248 @@ +### +# This makefile is used to generate the kernel documentation, +# primarily based on in-line comments in various source files. +# See Documentation/kernel-doc-nano-HOWTO.txt for instruction in how +# to document the SRC - and how to read it. +# To add a new book the only step required is to add the book to the +# list of DOCBOOKS. + +DOCBOOKS := z8530book.xml mcabook.xml device-drivers.xml \ + kernel-hacking.xml kernel-locking.xml deviceiobook.xml \ + procfs-guide.xml writing_usb_driver.xml networking.xml \ + kernel-api.xml filesystems.xml lsm.xml usb.xml kgdb.xml \ + gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \ + genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml \ + mac80211.xml debugobjects.xml sh.xml regulator.xml \ + alsa-driver-api.xml writing-an-alsa-driver.xml \ + tracepoint.xml media.xml + +### +# The build process is as follows (targets): +# (xmldocs) [by docproc] +# file.tmpl --> file.xml +--> file.ps (psdocs) [by db2ps or xmlto] +# +--> file.pdf (pdfdocs) [by db2pdf or xmlto] +# +--> DIR=file (htmldocs) [by xmlto] +# +--> man/ (mandocs) [by xmlto] + + +# for PDF and PS output you can choose between xmlto and docbook-utils tools +PDF_METHOD = $(prefer-db2x) +PS_METHOD = $(prefer-db2x) + + +### +# The targets that may be used. +PHONY += xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs cleandocs + +BOOKS := $(addprefix $(obj)/,$(DOCBOOKS)) +xmldocs: $(BOOKS) +sgmldocs: xmldocs + +PS := $(patsubst %.xml, %.ps, $(BOOKS)) +psdocs: $(PS) + +PDF := $(patsubst %.xml, %.pdf, $(BOOKS)) +pdfdocs: $(PDF) + +HTML := $(sort $(patsubst %.xml, %.html, $(BOOKS))) +htmldocs: $(HTML) + $(call build_main_index) + +MAN := $(patsubst %.xml, %.9, $(BOOKS)) +mandocs: $(MAN) + +installmandocs: mandocs + mkdir -p /usr/local/man/man9/ + install Documentation/DocBook/man/*.9.gz /usr/local/man/man9/ + +### +#External programs used +KERNELDOC = $(srctree)/scripts/kernel-doc +DOCPROC = $(objtree)/scripts/basic/docproc + +XMLTOFLAGS = -m $(srctree)/Documentation/DocBook/stylesheet.xsl +#XMLTOFLAGS += --skip-validation + +### +# DOCPROC is used for two purposes: +# 1) To generate a dependency list for a .tmpl file +# 2) To preprocess a .tmpl file and call kernel-doc with +# appropriate parameters. +# The following rules are used to generate the .xml documentation +# required to generate the final targets. (ps, pdf, html). +quiet_cmd_docproc = DOCPROC $@ + cmd_docproc = SRCTREE=$(srctree)/ $(DOCPROC) doc $< >$@ +define rule_docproc + set -e; \ + $(if $($(quiet)cmd_$(1)),echo ' $($(quiet)cmd_$(1))';) \ + $(cmd_$(1)); \ + ( \ + echo 'cmd_$@ := $(cmd_$(1))'; \ + echo $@: `SRCTREE=$(srctree) $(DOCPROC) depend $<`; \ + ) > $(dir $@).$(notdir $@).cmd +endef + +%.xml: %.tmpl FORCE + $(call if_changed_rule,docproc) + +### +#Read in all saved dependency files +cmd_files := $(wildcard $(foreach f,$(BOOKS),$(dir $(f)).$(notdir $(f)).cmd)) + +ifneq ($(cmd_files),) + include $(cmd_files) +endif + +### +# Changes in kernel-doc force a rebuild of all documentation +$(BOOKS): $(KERNELDOC) + +### +# procfs guide uses a .c file as example code. +# This requires an explicit dependency +C-procfs-example = procfs_example.xml +C-procfs-example2 = $(addprefix $(obj)/,$(C-procfs-example)) +$(obj)/procfs-guide.xml: $(C-procfs-example2) + +# List of programs to build +##oops, this is a kernel module::hostprogs-y := procfs_example +obj-m += procfs_example.o + +# Tell kbuild to always build the programs +always := $(hostprogs-y) + +notfoundtemplate = echo "*** You have to install docbook-utils or xmlto ***"; \ + exit 1 +db2xtemplate = db2TYPE -o $(dir $@) $< +xmltotemplate = xmlto TYPE $(XMLTOFLAGS) -o $(dir $@) $< + +# determine which methods are available +ifeq ($(shell which db2ps >/dev/null 2>&1 && echo found),found) + use-db2x = db2x + prefer-db2x = db2x +else + use-db2x = notfound + prefer-db2x = $(use-xmlto) +endif +ifeq ($(shell which xmlto >/dev/null 2>&1 && echo found),found) + use-xmlto = xmlto + prefer-xmlto = xmlto +else + use-xmlto = notfound + prefer-xmlto = $(use-db2x) +endif + +# the commands, generated from the chosen template +quiet_cmd_db2ps = PS $@ + cmd_db2ps = $(subst TYPE,ps, $($(PS_METHOD)template)) +%.ps : %.xml + $(call cmd,db2ps) + +quiet_cmd_db2pdf = PDF $@ + cmd_db2pdf = $(subst TYPE,pdf, $($(PDF_METHOD)template)) +%.pdf : %.xml + $(call cmd,db2pdf) + + +index = index.html +main_idx = Documentation/DocBook/$(index) +build_main_index = rm -rf $(main_idx) && \ + echo '<h1>Linux Kernel HTML Documentation</h1>' >> $(main_idx) && \ + echo '<h2>Kernel Version: $(KERNELVERSION)</h2>' >> $(main_idx) && \ + cat $(HTML) >> $(main_idx) + +quiet_cmd_db2html = HTML $@ + cmd_db2html = xmlto xhtml $(XMLTOFLAGS) -o $(patsubst %.html,%,$@) $< && \ + echo '<a HREF="$(patsubst %.html,%,$(notdir $@))/index.html"> \ + $(patsubst %.html,%,$(notdir $@))</a><p>' > $@ + +%.html: %.xml + @(which xmlto > /dev/null 2>&1) || \ + (echo "*** You need to install xmlto ***"; \ + exit 1) + @rm -rf $@ $(patsubst %.html,%,$@) + $(call cmd,db2html) + @if [ ! -z "$(PNG-$(basename $(notdir $@)))" ]; then \ + cp $(PNG-$(basename $(notdir $@))) $(patsubst %.html,%,$@); fi + +quiet_cmd_db2man = MAN $@ + cmd_db2man = if grep -q refentry $<; then xmlto man $(XMLTOFLAGS) -o $(obj)/man $< ; gzip -f $(obj)/man/*.9; fi +%.9 : %.xml + @(which xmlto > /dev/null 2>&1) || \ + (echo "*** You need to install xmlto ***"; \ + exit 1) + $(Q)mkdir -p $(obj)/man + $(call cmd,db2man) + @touch $@ + +### +# Rules to generate postscripts and PNG images from .fig format files +quiet_cmd_fig2eps = FIG2EPS $@ + cmd_fig2eps = fig2dev -Leps $< $@ + +%.eps: %.fig + @(which fig2dev > /dev/null 2>&1) || \ + (echo "*** You need to install transfig ***"; \ + exit 1) + $(call cmd,fig2eps) + +quiet_cmd_fig2png = FIG2PNG $@ + cmd_fig2png = fig2dev -Lpng $< $@ + +%.png: %.fig + @(which fig2dev > /dev/null 2>&1) || \ + (echo "*** You need to install transfig ***"; \ + exit 1) + $(call cmd,fig2png) + +### +# Rule to convert a .c file to inline XML documentation + gen_xml = : + quiet_gen_xml = echo ' GEN $@' +silent_gen_xml = : +%.xml: %.c + @$($(quiet)gen_xml) + @( \ + echo "<programlisting>"; \ + expand --tabs=8 < $< | \ + sed -e "s/&/\\&/g" \ + -e "s/</\\</g" \ + -e "s/>/\\>/g"; \ + echo "</programlisting>") > $@ + +### +# Help targets as used by the top-level makefile +dochelp: + @echo ' Linux kernel internal documentation in different formats:' + @echo ' htmldocs - HTML' + @echo ' pdfdocs - PDF' + @echo ' psdocs - Postscript' + @echo ' xmldocs - XML DocBook' + @echo ' mandocs - man pages' + @echo ' installmandocs - install man pages generated by mandocs' + @echo ' cleandocs - clean all generated DocBook files' + +### +# Temporary files left by various tools +clean-files := $(DOCBOOKS) \ + $(patsubst %.xml, %.dvi, $(DOCBOOKS)) \ + $(patsubst %.xml, %.aux, $(DOCBOOKS)) \ + $(patsubst %.xml, %.tex, $(DOCBOOKS)) \ + $(patsubst %.xml, %.log, $(DOCBOOKS)) \ + $(patsubst %.xml, %.out, $(DOCBOOKS)) \ + $(patsubst %.xml, %.ps, $(DOCBOOKS)) \ + $(patsubst %.xml, %.pdf, $(DOCBOOKS)) \ + $(patsubst %.xml, %.html, $(DOCBOOKS)) \ + $(patsubst %.xml, %.9, $(DOCBOOKS)) \ + $(C-procfs-example) $(index) + +clean-dirs := $(patsubst %.xml,%,$(DOCBOOKS)) man + +cleandocs: + $(Q)rm -f $(call objectify, $(clean-files)) + $(Q)rm -rf $(call objectify, $(clean-dirs)) + +# Declare the contents of the .PHONY variable as phony. We keep that +# information in a variable se we can use it in if_changed and friends. + +.PHONY: $(PHONY) diff --git a/linux/Documentation/dvb/get_dvb_firmware b/linux/Documentation/dvb/get_dvb_firmware index 3d1b0ab70..14b7b5a3b 100755 --- a/linux/Documentation/dvb/get_dvb_firmware +++ b/linux/Documentation/dvb/get_dvb_firmware @@ -25,7 +25,8 @@ use IO::Handle; "tda10046lifeview", "av7110", "dec2000t", "dec2540t", "dec3000s", "vp7041", "dibusb", "nxt2002", "nxt2004", "or51211", "or51132_qam", "or51132_vsb", "bluebird", - "opera1", "cx231xx", "cx18", "cx23885", "pvrusb2", "mpc718" ); + "opera1", "cx231xx", "cx18", "cx23885", "pvrusb2", "mpc718", + "af9015"); # Check args syntax() if (scalar(@ARGV) != 1); @@ -514,6 +515,40 @@ sub bluebird { $outfile; } +sub af9015 { + my $sourcefile = "download.ashx?file=57"; + my $url = "http://www.ite.com.tw/EN/Services/$sourcefile"; + my $hash = "ff5b096ed47c080870eacdab2de33ad6"; + my $outfile = "dvb-usb-af9015.fw"; + my $tmpdir = tempdir(DIR => "/tmp", CLEANUP => 1); + my $fwoffset = 0x22708; + my $fwlength = 18225; + my ($chunklength, $buf, $rcount); + + checkstandard(); + + wgetfile($sourcefile, $url); + unzip($sourcefile, $tmpdir); + verify("$tmpdir/Driver/Files/AF15BDA.sys", $hash); + + open INFILE, '<', "$tmpdir/Driver/Files/AF15BDA.sys"; + open OUTFILE, '>', $outfile; + + sysseek(INFILE, $fwoffset, SEEK_SET); + while($fwlength > 0) { + $chunklength = 55; + $chunklength = $fwlength if ($chunklength > $fwlength); + $rcount = sysread(INFILE, $buf, $chunklength); + die "Ran out of data\n" if ($rcount != $chunklength); + syswrite(OUTFILE, $buf); + sysread(INFILE, $buf, 8); + $fwlength -= $rcount + 8; + } + + close OUTFILE; + close INFILE; +} + # --------------------------------------------------------------- # Utilities diff --git a/linux/Documentation/video4linux/CARDLIST.em28xx b/linux/Documentation/video4linux/CARDLIST.em28xx index 66e5f8295..b13fcbd5d 100644 --- a/linux/Documentation/video4linux/CARDLIST.em28xx +++ b/linux/Documentation/video4linux/CARDLIST.em28xx @@ -7,7 +7,7 @@ 6 -> Terratec Cinergy 200 USB (em2800) 7 -> Leadtek Winfast USB II (em2800) [0413:6023] 8 -> Kworld USB2800 (em2800) - 9 -> Pinnacle Dazzle DVC 90/100/101/107 / Kaiser Baas Video to DVD maker (em2820/em2840) [1b80:e302,2304:0207,2304:021a] + 9 -> Pinnacle Dazzle DVC 90/100/101/107 / Kaiser Baas Video to DVD maker (em2820/em2840) [1b80:e302,1b80:e304,2304:0207,2304:021a] 10 -> Hauppauge WinTV HVR 900 (em2880) [2040:6500] 11 -> Terratec Hybrid XS (em2880) [0ccd:0042] 12 -> Kworld PVR TV 2800 RF (em2820/em2840) @@ -67,3 +67,4 @@ 69 -> KWorld ATSC 315U HDTV TV Box (em2882) [eb1a:a313] 70 -> Evga inDtube (em2882) 71 -> Silvercrest Webcam 1.3mpix (em2820/em2840) + 72 -> Gadmei UTV330+ (em2861) diff --git a/linux/Documentation/video4linux/CARDLIST.saa7134 b/linux/Documentation/video4linux/CARDLIST.saa7134 index c913e5614..0ac4d2544 100644 --- a/linux/Documentation/video4linux/CARDLIST.saa7134 +++ b/linux/Documentation/video4linux/CARDLIST.saa7134 @@ -167,3 +167,7 @@ 166 -> Beholder BeholdTV 607 RDS [5ace:6073] 167 -> Beholder BeholdTV 609 RDS [5ace:6092] 168 -> Beholder BeholdTV 609 RDS [5ace:6093] +169 -> Compro VideoMate S350/S300 [185b:c900] +170 -> AverMedia AverTV Studio 505 [1461:a115] +171 -> Beholder BeholdTV X7 [5ace:7595] +172 -> RoverMedia TV Link Pro FM [19d1:0138] diff --git a/linux/Documentation/video4linux/gspca.txt b/linux/Documentation/video4linux/gspca.txt index b43702470..4686e84dd 100644 --- a/linux/Documentation/video4linux/gspca.txt +++ b/linux/Documentation/video4linux/gspca.txt @@ -183,6 +183,7 @@ ov534 06f8:3002 Hercules Blog Webcam ov534 06f8:3003 Hercules Dualpix HD Weblog sonixj 06f8:3004 Hercules Classic Silver sonixj 06f8:3008 Hercules Deluxe Optical Glass +pac7311 06f8:3009 Hercules Classic Link spca508 0733:0110 ViewQuest VQ110 spca508 0130:0130 Clone Digital Webcam 11043 spca501 0733:0401 Intel Create and Share @@ -239,6 +240,7 @@ pac7311 093a:2626 Labtec 2200 pac7311 093a:2629 Genious iSlim 300 pac7311 093a:262a Webcam 300k pac7311 093a:262c Philips SPC 230 NC +jeilinj 0979:0280 Sakar 57379 zc3xx 0ac8:0302 Z-star Vimicro zc0302 vc032x 0ac8:0321 Vimicro generic vc0321 vc032x 0ac8:0323 Vimicro Vc0323 diff --git a/linux/Documentation/video4linux/si4713.txt b/linux/Documentation/video4linux/si4713.txt new file mode 100644 index 000000000..25abdb782 --- /dev/null +++ b/linux/Documentation/video4linux/si4713.txt @@ -0,0 +1,176 @@ +Driver for I2C radios for the Silicon Labs Si4713 FM Radio Transmitters + +Copyright (c) 2009 Nokia Corporation +Contact: Eduardo Valentin <eduardo.valentin@nokia.com> + + +Information about the Device +============================ +This chip is a Silicon Labs product. It is a I2C device, currently on 0x63 address. +Basically, it has transmission and signal noise level measurement features. + +The Si4713 integrates transmit functions for FM broadcast stereo transmission. +The chip also allows integrated receive power scanning to identify low signal +power FM channels. + +The chip is programmed using commands and responses. There are also several +properties which can change the behavior of this chip. + +Users must comply with local regulations on radio frequency (RF) transmission. + +Device driver description +========================= +There are two modules to handle this device. One is a I2C device driver +and the other is a platform driver. + +The I2C device driver exports a v4l2-subdev interface to the kernel. +All properties can also be accessed by v4l2 extended controls interface, by +using the v4l2-subdev calls (g_ext_ctrls, s_ext_ctrls). + +The platform device driver exports a v4l2 radio device interface to user land. +So, it uses the I2C device driver as a sub device in order to send the user +commands to the actual device. Basically it is a wrapper to the I2C device driver. + +Applications can use v4l2 radio API to specify frequency of operation, mute state, +etc. But mostly of its properties will be present in the extended controls. + +When the v4l2 mute property is set to 1 (true), the driver will turn the chip off. + +Properties description +====================== + +The properties can be accessed using v4l2 extended controls. +Here is an output from v4l2-ctl util: +/ # v4l2-ctl -d /dev/radio0 --all -L +Driver Info: + Driver name : radio-si4713 + Card type : Silicon Labs Si4713 Modulator + Bus info : + Driver version: 0 + Capabilities : 0x00080800 + RDS Output + Modulator +Audio output: 0 (FM Modulator Audio Out) +Frequency: 1408000 (88.000000 MHz) +Video Standard = 0x00000000 +Modulator: + Name : FM Modulator + Capabilities : 62.5 Hz stereo rds + Frequency range : 76.0 MHz - 108.0 MHz + Subchannel modulation: stereo+rds + +User Controls + + mute (bool) : default=1 value=0 + +FM Radio Modulator Controls + + rds_signal_deviation (int) : min=0 max=90000 step=10 default=200 value=200 flags=slider + rds_program_id (int) : min=0 max=65535 step=1 default=0 value=0 + rds_program_type (int) : min=0 max=31 step=1 default=0 value=0 + rds_ps_name (str) : min=0 max=96 step=8 value='si4713 ' + rds_radio_text (str) : min=0 max=384 step=32 value='' + audio_limiter_feature_enabled (bool) : default=1 value=1 + audio_limiter_release_time (int) : min=250 max=102390 step=50 default=5010 value=5010 flags=slider + audio_limiter_deviation (int) : min=0 max=90000 step=10 default=66250 value=66250 flags=slider +audio_compression_feature_enabl (bool) : default=1 value=1 + audio_compression_gain (int) : min=0 max=20 step=1 default=15 value=15 flags=slider + audio_compression_threshold (int) : min=-40 max=0 step=1 default=-40 value=-40 flags=slider + audio_compression_attack_time (int) : min=0 max=5000 step=500 default=0 value=0 flags=slider + audio_compression_release_time (int) : min=100000 max=1000000 step=100000 default=1000000 value=1000000 flags=slider + pilot_tone_feature_enabled (bool) : default=1 value=1 + pilot_tone_deviation (int) : min=0 max=90000 step=10 default=6750 value=6750 flags=slider + pilot_tone_frequency (int) : min=0 max=19000 step=1 default=19000 value=19000 flags=slider + pre_emphasis_settings (menu) : min=0 max=2 default=1 value=1 + tune_power_level (int) : min=0 max=120 step=1 default=88 value=88 flags=slider + tune_antenna_capacitor (int) : min=0 max=191 step=1 default=0 value=110 flags=slider +/ # + +Here is a summary of them: + +* Pilot is an audible tone sent by the device. + +pilot_frequency - Configures the frequency of the stereo pilot tone. +pilot_deviation - Configures pilot tone frequency deviation level. +pilot_enabled - Enables or disables the pilot tone feature. + +* The si4713 device is capable of applying audio compression to the transmitted signal. + +acomp_enabled - Enables or disables the audio dynamic range control feature. +acomp_gain - Sets the gain for audio dynamic range control. +acomp_threshold - Sets the threshold level for audio dynamic range control. +acomp_attack_time - Sets the attack time for audio dynamic range control. +acomp_release_time - Sets the release time for audio dynamic range control. + +* Limiter setups audio deviation limiter feature. Once a over deviation occurs, +it is possible to adjust the front-end gain of the audio input and always +prevent over deviation. + +limiter_enabled - Enables or disables the limiter feature. +limiter_deviation - Configures audio frequency deviation level. +limiter_release_time - Sets the limiter release time. + +* Tuning power + +power_level - Sets the output power level for signal transmission. +antenna_capacitor - This selects the value of antenna tuning capacitor manually +or automatically if set to zero. + +* RDS related + +rds_ps_name - Sets the RDS ps name field for transmission. +rds_radio_text - Sets the RDS radio text for transmission. +rds_pi - Sets the RDS PI field for transmission. +rds_pty - Sets the RDS PTY field for transmission. + +* Region related + +preemphasis - sets the preemphasis to be applied for transmission. + +RNL +=== + +This device also has an interface to measure received noise level. To do that, you should +ioctl the device node. Here is an code of example: + +int main (int argc, char *argv[]) +{ + struct si4713_rnl rnl; + int fd = open("/dev/radio0", O_RDWR); + int rval; + + if (argc < 2) + return -EINVAL; + + if (fd < 0) + return fd; + + sscanf(argv[1], "%d", &rnl.frequency); + + rval = ioctl(fd, SI4713_IOC_MEASURE_RNL, &rnl); + if (rval < 0) + return rval; + + printf("received noise level: %d\n", rnl.rnl); + + close(fd); +} + +The struct si4713_rnl and SI4713_IOC_MEASURE_RNL are defined under +include/media/si4713.h. + +Stereo/Mono and RDS subchannels +=============================== + +The device can also be configured using the available sub channels for +transmission. To do that use S/G_MODULATOR ioctl and configure txsubchans properly. +Refer to v4l2-spec for proper use of this ioctl. + +Testing +======= +Testing is usually done with v4l2-ctl utility for managing FM tuner cards. +The tool can be found in v4l-dvb repository under v4l2-apps/util directory. + +Example for setting rds ps name: +# v4l2-ctl -d /dev/radio0 --set-ctrl=rds_ps_name="Dummy" + diff --git a/linux/Documentation/video4linux/soc-camera.txt b/linux/Documentation/video4linux/soc-camera.txt index 178ef3c5e..3f87c7da4 100644 --- a/linux/Documentation/video4linux/soc-camera.txt +++ b/linux/Documentation/video4linux/soc-camera.txt @@ -116,5 +116,45 @@ functionality. struct soc_camera_device also links to an array of struct soc_camera_data_format, listing pixel formats, supported by the camera. +VIDIOC_S_CROP and VIDIOC_S_FMT behaviour +---------------------------------------- + +Above user ioctls modify image geometry as follows: + +VIDIOC_S_CROP: sets location and sizes of the sensor window. Unit is one sensor +pixel. Changing sensor window sizes preserves any scaling factors, therefore +user window sizes change as well. + +VIDIOC_S_FMT: sets user window. Should preserve previously set sensor window as +much as possible by modifying scaling factors. If the sensor window cannot be +preserved precisely, it may be changed too. + +In soc-camera there are two locations, where scaling and cropping can taks +place: in the camera driver and in the host driver. User ioctls are first passed +to the host driver, which then generally passes them down to the camera driver. +It is more efficient to perform scaling and cropping in the camera driver to +save camera bus bandwidth and maximise the framerate. However, if the camera +driver failed to set the required parameters with sufficient precision, the host +driver may decide to also use its own scaling and cropping to fulfill the user's +request. + +Camera drivers are interfaced to the soc-camera core and to host drivers over +the v4l2-subdev API, which is completely functional, it doesn't pass any data. +Therefore all camera drivers shall reply to .g_fmt() requests with their current +output geometry. This is necessary to correctly configure the camera bus. +.s_fmt() and .try_fmt() have to be implemented too. Sensor window and scaling +factors have to be maintained by camera drivers internally. According to the +V4L2 API all capture drivers must support the VIDIOC_CROPCAP ioctl, hence we +rely on camera drivers implementing .cropcap(). If the camera driver does not +support cropping, it may choose to not implement .s_crop(), but to enable +cropping support by the camera host driver at least the .g_crop method must be +implemented. + +User window geometry is kept in .user_width and .user_height fields in struct +soc_camera_device and used by the soc-camera core and host drivers. The core +updates these fields upon successful completion of a .s_fmt() call, but if these +fields change elsewhere, e.g., during .s_crop() processing, the host driver is +responsible for updating them. + -- Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de> diff --git a/linux/Documentation/video4linux/v4l2-framework.txt b/linux/Documentation/video4linux/v4l2-framework.txt index ba4706afc..b806edaf3 100644 --- a/linux/Documentation/video4linux/v4l2-framework.txt +++ b/linux/Documentation/video4linux/v4l2-framework.txt @@ -370,19 +370,20 @@ from the remove() callback ensures that this is always done correctly. The bridge driver also has some helper functions it can use: struct v4l2_subdev *sd = v4l2_i2c_new_subdev(v4l2_dev, adapter, - "module_foo", "chipid", 0x36); + "module_foo", "chipid", 0x36, NULL); This loads the given module (can be NULL if no module needs to be loaded) and calls i2c_new_device() with the given i2c_adapter and chip/address arguments. If all goes well, then it registers the subdev with the v4l2_device. -You can also use v4l2_i2c_new_probed_subdev() which is very similar to -v4l2_i2c_new_subdev(), except that it has an array of possible I2C addresses -that it should probe. Internally it calls i2c_new_probed_device(). +You can also use the last argument of v4l2_i2c_new_subdev() to pass an array +of possible I2C addresses that it should probe. These probe addresses are +only used if the previous argument is 0. A non-zero argument means that you +know the exact i2c address so in that case no probing will take place. Both functions return NULL if something went wrong. -Note that the chipid you pass to v4l2_i2c_new_(probed_)subdev() is usually +Note that the chipid you pass to v4l2_i2c_new_subdev() is usually the same as the module name. It allows you to specify a chip variant, e.g. "saa7114" or "saa7115". In general though the i2c driver autodetects this. The use of chipid is something that needs to be looked at more closely at a @@ -410,11 +411,6 @@ the irq and platform_data arguments after the subdev was setup. The older v4l2_i2c_new_(probed_)subdev functions will call s_config as well, but with irq set to 0 and platform_data set to NULL. -Note that in the next kernel release the functions v4l2_i2c_new_subdev, -v4l2_i2c_new_probed_subdev and v4l2_i2c_new_probed_subdev_addr will all be -replaced by a single v4l2_i2c_new_subdev that is identical to -v4l2_i2c_new_subdev_cfg but without the irq and platform_data arguments. - struct video_device ------------------- @@ -490,31 +486,35 @@ VFL_TYPE_RADIO: radioX for radio tuners VFL_TYPE_VTX: vtxX for teletext devices (deprecated, don't use) The last argument gives you a certain amount of control over the device -kernel number used (i.e. the X in videoX). Normally you will pass -1 to -let the v4l2 framework pick the first free number. But if a driver creates -many devices, then it can be useful to have different video devices in -separate ranges. For example, video capture devices start at 0, video -output devices start at 16. - -So you can use the last argument to specify a minimum kernel number and -the v4l2 framework will try to pick the first free number that is equal +device node number used (i.e. the X in videoX). Normally you will pass -1 +to let the v4l2 framework pick the first free number. But sometimes users +want to select a specific node number. It is common that drivers allow +the user to select a specific device node number through a driver module +option. That number is then passed to this function and video_register_device +will attempt to select that device node number. If that number was already +in use, then the next free device node number will be selected and it +will send a warning to the kernel log. + +Another use-case is if a driver creates many devices. In that case it can +be useful to place different video devices in separate ranges. For example, +video capture devices start at 0, video output devices start at 16. +So you can use the last argument to specify a minimum device node number +and the v4l2 framework will try to pick the first free number that is equal or higher to what you passed. If that fails, then it will just pick the first free number. +Since in this case you do not care about a warning about not being able +to select the specified device node number, you can call the function +video_register_device_no_warn() instead. + Whenever a device node is created some attributes are also created for you. If you look in /sys/class/video4linux you see the devices. Go into e.g. video0 and you will see 'name' and 'index' attributes. The 'name' attribute -is the 'name' field of the video_device struct. The 'index' attribute is -a device node index that can be assigned by the driver, or that is calculated -for you. - -If you call video_register_device(), then the index is just increased by -1 for each device node you register. The first video device node you register -always starts off with 0. +is the 'name' field of the video_device struct. -Alternatively you can call video_register_device_index() which is identical -to video_register_device(), but with an extra index argument. Here you can -pass a specific index value (between 0 and 31) that should be used. +The 'index' attribute is the index of the device node: for each call to +video_register_device() the index is just increased by 1. The first video +device node you register always starts with index 0. Users can setup udev rules that utilize the index attribute to make fancy device names (e.g. 'mpegX' for MPEG video capture device nodes). @@ -523,9 +523,8 @@ After the device was successfully registered, then you can use these fields: - vfl_type: the device type passed to video_register_device. - minor: the assigned device minor number. -- num: the device kernel number (i.e. the X in videoX). -- index: the device index number (calculated or set explicitly using - video_register_device_index). +- num: the device node number (i.e. the X in videoX). +- index: the device index number. If the registration failed, then you need to call video_device_release() to free the allocated video_device struct, or free your own struct if the |