Commit b94d10e7 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for_linus' of git://

* 'for_linus' of git:// (707 commits)
  V4L/DVB (11316): saa7191: tuner ops wasn't set.
  V4L/DVB (11315): cx25840: fix 'unused variable' warning.
  V4L/DVB (11314): au8522: remove unused I2C_DRIVERID
  V4L/DVB (11313): v4l2-subdev: add enum_framesizes and enum_frameintervals.
  V4L/DVB (11312): tuner: remove V4L1 code from this driver.
  V4L/DVB (11311): v4l: replace 'ioctl' references in v4l i2c drivers
  V4L/DVB (11310): cx18: remove intermediate 'ioctl' step
  V4L/DVB (11309): cx25840: cleanup: remove intermediate 'ioctl' step
  V4L/DVB (11308): msp3400: use the V4L2 header since no V4L1 code is there
  V4L/DVB (11305): cx88: prevent probing rtc and ir devices
  V4L/DVB (11304): v4l2: remove v4l2_subdev_command calls where they are no longer needed.
  V4L/DVB (11303): tda7432: remove legacy code for old-style i2c API
  V4L/DVB (11302): tda9875: remove legacy code for old-style i2c API
  V4L/DVB (11301): wm8775: remove legacy code for old-style i2c API
  V4L/DVB (11300): cx88: convert to v4l2_subdev.
  V4L/DVB (11298): cx25840: remove legacy code for old-style i2c API
  V4L/DVB (11297): cx23885: convert to v4l2_subdev.
  V4L/DVB (11296): cx23885: bugfix error message if firmware is not found
  V4L/DVB (11295): cx23885: convert to v4l2_device.
  V4L/DVB (11293): uvcvideo: Add zero fill for VIDIOC_ENUM_FMT
parents b80e0d27 fd3a0195
......@@ -25,7 +25,7 @@ use IO::Handle;
"tda10046lifeview", "av7110", "dec2000t", "dec2540t",
"dec3000s", "vp7041", "dibusb", "nxt2002", "nxt2004",
"or51211", "or51132_qam", "or51132_vsb", "bluebird",
"opera1", "cx231xx", "cx18", "cx23885", "pvrusb2" );
# Check args
syntax() if (scalar(@ARGV) != 1);
......@@ -37,8 +37,8 @@ for ($i=0; $i < scalar(@components); $i++) {
$outfile = eval($cid);
die $@ if $@;
print STDERR <<EOF;
Firmware $outfile extracted successfully.
Now copy it to either /usr/lib/hotplug/firmware or /lib/firmware
Firmware(s) $outfile extracted successfully.
Now copy it(they) to either /usr/lib/hotplug/firmware or /lib/firmware
(depending on configuration of firmware hotplug).
......@@ -345,6 +345,85 @@ sub or51211 {
sub cx231xx {
my $fwfile = "v4l-cx231xx-avcore-01.fw";
my $url = "$fwfile";
my $hash = "7d3bb956dc9df0eafded2b56ba57cc42";
wgetfile($fwfile, $url);
verify($fwfile, $hash);
sub cx18 {
my $url = "";
my %files = (
'v4l-cx23418-apu.fw' => '588f081b562f5c653a3db1ad8f65939a',
'v4l-cx23418-cpu.fw' => 'b6c7ed64bc44b1a6e0840adaeac39d79',
'v4l-cx23418-dig.fw' => '95bc688d3e7599fd5800161e9971cc55',
my $allfiles;
foreach my $fwfile (keys %files) {
wgetfile($fwfile, "$url/$fwfile");
verify($fwfile, $files{$fwfile});
$allfiles .= " $fwfile";
$allfiles =~ s/^\s//;
sub cx23885 {
my $url = "";
my %files = (
'v4l-cx23885-avcore-01.fw' => 'a9f8f5d901a7fb42f552e1ee6384f3bb',
'v4l-cx23885-enc.fw' => 'a9f8f5d901a7fb42f552e1ee6384f3bb',
my $allfiles;
foreach my $fwfile (keys %files) {
wgetfile($fwfile, "$url/$fwfile");
verify($fwfile, $files{$fwfile});
$allfiles .= " $fwfile";
$allfiles =~ s/^\s//;
sub pvrusb2 {
my $url = "";
my %files = (
'v4l-cx25840.fw' => 'dadb79e9904fc8af96e8111d9cb59320',
my $allfiles;
foreach my $fwfile (keys %files) {
wgetfile($fwfile, "$url/$fwfile");
verify($fwfile, $files{$fwfile});
$allfiles .= " $fwfile";
$allfiles =~ s/^\s//;
sub or51132_qam {
my $fwfile = "dvb-fe-or51132-qam.fw";
my $url = "$fwfile";
......@@ -64,10 +64,10 @@ Who: Pavel Machek <>
What: Video4Linux API 1 ioctls and video_decoder.h from Video devices.
When: December 2008
Files: include/linux/video_decoder.h include/linux/videodev.h
Check: include/linux/video_decoder.h include/linux/videodev.h
What: Video4Linux API 1 ioctls and from Video devices.
When: July 2009
Files: include/linux/videodev.h
Check: include/linux/videodev.h
Why: V4L1 AP1 was replaced by V4L2 API during migration from 2.4 to 2.6
series. The old API have lots of drawbacks and don't provide enough
means to work with all video and audio standards. The newer API is
......@@ -122,10 +122,8 @@ Code Seq# Include File Comments
'c' 00-7F linux/coda.h conflict!
'c' 80-9F arch/s390/include/asm/chsc.h
'd' 00-FF linux/char/drm/drm/h conflict!
'd' 00-DF linux/video_decoder.h conflict!
'd' F0-FF linux/digi1.h
'e' all linux/digi1.h conflict!
'e' 00-1F linux/video_encoder.h conflict!
'e' 00-1F net/irda/irtty.h conflict!
'f' 00-1F linux/ext2_fs.h
'h' 00-7F Charon filesystem
......@@ -135,7 +135,7 @@
134 -> Adlink RTV24
135 -> DViCO FusionHDTV 5 Lite [18ac:d500]
136 -> Acorp Y878F [9511:1540]
137 -> Conceptronic CTVFMi v2
137 -> Conceptronic CTVFMi v2 [036e:109e]
138 -> Prolink Pixelview PV-BT878P+ (Rev.2E)
139 -> Prolink PixelView PlayTV MPEG2 PV-M4900
140 -> Osprey 440 [0070:ff07]
......@@ -154,3 +154,7 @@
153 -> PHYTEC VD-012 (bt878)
154 -> PHYTEC VD-012-X1 (bt878)
155 -> PHYTEC VD-012-X2 (bt878)
156 -> IVCE-8784 [0000:f050,0001:f050,0002:f050,0003:f050]
157 -> Geovision GV-800(S) (master) [800a:763d]
158 -> Geovision GV-800(S) (slave) [800b:763d,800c:763d,800d:763d]
159 -> ProVideo PV183 [1830:1540,1831:1540,1832:1540,1833:1540,1834:1540,1835:1540,1836:1540,1837:1540]
......@@ -12,3 +12,7 @@
11 -> DViCO FusionHDTV DVB-T Dual Express [18ac:db78]
12 -> Leadtek Winfast PxDVR3200 H [107d:6681]
13 -> Compro VideoMate E650F [185b:e800]
14 -> TurboSight TBS 6920 [6920:8888]
15 -> TeVii S470 [d470:9022]
16 -> DVBWorld DVB-S2 2005 [0001:2005]
17 -> NetUP Dual DVB-S2 CI [1b55:2a2c]
......@@ -77,3 +77,4 @@
76 -> SATTRADE ST4200 DVB-S/S2 [b200:4200]
77 -> TBS 8910 DVB-S [8910:8888]
78 -> Prof 6200 DVB-S [b022:3022]
79 -> Terratec Cinergy HT PCI MKII [153b:1177]
......@@ -7,12 +7,12 @@
6 -> Terratec Cinergy 200 USB (em2800)
7 -> Leadtek Winfast USB II (em2800) [0413:6023]
8 -> Kworld USB2800 (em2800)
9 -> Pinnacle Dazzle DVC 90/DVC 100 (em2820/em2840) [2304:0207,2304:021a]
9 -> Pinnacle Dazzle DVC 90/100/101/107 / Kaiser Baas Video to DVD maker (em2820/em2840) [1b80:e302,2304:0207,2304:021a]
10 -> Hauppauge WinTV HVR 900 (em2880) [2040:6500]
11 -> Terratec Hybrid XS (em2880) [0ccd:0042]
12 -> Kworld PVR TV 2800 RF (em2820/em2840)
13 -> Terratec Prodigy XS (em2880) [0ccd:0047]
14 -> Pixelview Prolink PlayTV USB 2.0 (em2820/em2840)
14 -> SIIG AVTuner-PVR / Pixelview Prolink PlayTV USB 2.0 (em2820/em2840)
15 -> V-Gear PocketTV (em2800)
16 -> Hauppauge WinTV HVR 950 (em2883) [2040:6513,2040:6517,2040:651b]
17 -> Pinnacle PCTV HD Pro Stick (em2880) [2304:0227]
......@@ -30,7 +30,6 @@
30 -> Videology 20K14XUSB USB2.0 (em2820/em2840)
31 -> Usbgear VD204v9 (em2821)
32 -> Supercomp USB 2.0 TV (em2821)
33 -> SIIG AVTuner-PVR/Prolink PlayTV USB 2.0 (em2821)
34 -> Terratec Cinergy A Hybrid XS (em2860) [0ccd:004f]
35 -> Typhoon DVD Maker (em2860)
36 -> NetGMBH Cam (em2860)
......@@ -58,3 +57,7 @@
58 -> Compro VideoMate ForYou/Stereo (em2820/em2840) [185b:2041]
60 -> Hauppauge WinTV HVR 850 (em2883) [2040:651f]
61 -> Pixelview PlayTV Box 4 USB 2.0 (em2820/em2840)
62 -> Gadmei TVR200 (em2820/em2840)
63 -> Kaiomy TVnPC U2 (em2860) [eb1a:e303]
64 -> Easy Cap Capture DC-60 (em2860)
65 -> IO-DATA GV-MVP/SZ (em2820/em2840) [04bb:0515]
......@@ -153,3 +153,5 @@
152 -> Asus Tiger Rev:1.00 [1043:4857]
153 -> Kworld Plus TV Analog Lite PCI [17de:7128]
154 -> Avermedia AVerTV GO 007 FM Plus [1461:f31d]
155 -> Hauppauge WinTV-HVR1120 ATSC/QAM-Hybrid [0070:6706,0070:6708]
156 -> Hauppauge WinTV-HVR1110r3 [0070:6707,0070:6709,0070:670a]
......@@ -401,8 +401,7 @@ Additional notes for software developers:
first set the correct norm. Well, it seems logically correct: TV
standard is "more constant" for current country than geometry
settings of a variety of TV capture cards which may work in ITU or
square pixel format. Remember that users now can lock the norm to
avoid any ambiguity.
square pixel format.
Please note that lavplay/lavrec are also included in the MJPEG-tools
......@@ -81,16 +81,6 @@ tuner.o
pal=[bdgil] select PAL variant (used for some tuners
only, important for the audio carrier).
registers a mixer device for the TV card's volume/bass/treble
controls (requires a i2c audio control chip like the msp3400).
insmod args:
debug=1 print some debug info to the syslog.
devnr=n allocate device #n (0 == /dev/mixer,
1 = /dev/mixer1, ...), default is to
use the first free one.
new, experimental module which is supported to provide a single
driver for all simple i2c audio control chips (tda/tea*).
......@@ -63,8 +63,8 @@ If you have some knowledge and spare time, please try to fix this
yourself (patches very welcome of course...) You know: The linux
slogan is "Do it yourself".
There is a mailing list:
There is a mailing list:
If you have trouble with some specific TV card, try to ask there
instead of mailing me directly. The chance that someone with the
......@@ -32,6 +32,10 @@ Y, U and V planes. This code assumes frames of 720x576 (PAL) pixels.
The width of a frame is always 720 pixels, regardless of the actual specified
If the height is not a multiple of 32 lines, then the captured video is
missing macroblocks at the end and is unusable. So the height must be a
multiple of 32.
#include <stdio.h>
......@@ -32,6 +32,7 @@ spca561 041e:403b Creative Webcam Vista (VF0010)
zc3xx 041e:4051 Creative Live!Cam Notebook Pro (VF0250)
ov519 041e:4052 Creative Live! VISTA IM
zc3xx 041e:4053 Creative Live!Cam Video IM
vc032x 041e:405b Creative Live! Cam Notebook Ultra (VC0130)
ov519 041e:405f Creative Live! VISTA VF0330
ov519 041e:4060 Creative Live! VISTA VF0350
ov519 041e:4061 Creative Live! VISTA VF0400
......@@ -193,6 +194,7 @@ spca500 084d:0003 D-Link DSC-350
spca500 08ca:0103 Aiptek PocketDV
sunplus 08ca:0104 Aiptek PocketDVII 1.3
sunplus 08ca:0106 Aiptek Pocket DV3100+
mr97310a 08ca:0111 Aiptek PenCam VGA+
sunplus 08ca:2008 Aiptek Mini PenCam 2 M
sunplus 08ca:2010 Aiptek PocketCam 3M
sunplus 08ca:2016 Aiptek PocketCam 2 Mega
......@@ -215,6 +217,7 @@ pac207 093a:2468 PAC207
pac207 093a:2470 Genius GF112
pac207 093a:2471 Genius VideoCam ge111
pac207 093a:2472 Genius VideoCam ge110
pac207 093a:2474 Genius iLook 111
pac207 093a:2476 Genius e-Messenger 112
pac7311 093a:2600 PAC7311 Typhoon
pac7311 093a:2601 Philips SPC 610 NC
......@@ -279,6 +282,7 @@ spca561 10fd:7e50 FlyCam Usb 100
zc3xx 10fd:8050 Typhoon Webshot II USB 300k
ov534 1415:2000 Sony HD Eye for PS3 (SLEH 00201)
pac207 145f:013a Trust WB-1300N
vc032x 15b8:6001 HP 2.0 Megapixel
vc032x 15b8:6002 HP 2.0 Megapixel rz406aa
spca501 1776:501c Arowana 300K CMOS Camera
t613 17a1:0128 TASCORP JPEG Webcam, NGS Cyclops
Driver for USB radios for the Silicon Labs Si470x FM Radio Receivers
Copyright (c) 2008 Tobias Lorenz <>
Copyright (c) 2009 Tobias Lorenz <>
Information from Silicon Labs
......@@ -41,7 +41,7 @@ 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: DealExtreme USB Radio
- 10c5:819a: Sanei Electric, Inc. FM USB Radio (sold as PCear)
......@@ -52,6 +52,7 @@ Testing is usually done with most application under Debian/testing:
- gradio - GTK FM radio tuner
- kradio - Comfortable Radio Application for KDE
- radio - ncurses-based radio application
- mplayer - The Ultimate Movie Player For Linux
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
......@@ -69,7 +70,7 @@ 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
......@@ -80,6 +81,10 @@ 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 -
If you use mplayer try:
mplayer -radio adevice=hw=1.0:arate=96000 \
-rawaudio rate=96000 \
Module Parameters
......@@ -47,7 +47,9 @@ All drivers have the following structure:
3) Creating V4L2 device nodes (/dev/videoX, /dev/vbiX, /dev/radioX and
/dev/vtxX) and keeping track of device-node specific data.
4) Filehandle-specific structs containing per-filehandle data.
4) Filehandle-specific structs containing per-filehandle data;
5) video buffer handling.
This is a rough schematic of how it all relates:
......@@ -82,12 +84,20 @@ You must register the device instance:
v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev);
Registration will initialize the v4l2_device struct and link dev->driver_data
to v4l2_dev. Registration will also set v4l2_dev->name to a value derived from
dev (driver name followed by the bus_id, to be precise). You may change the
name after registration if you want.
to v4l2_dev. If v4l2_dev->name is empty then it will be set to a value derived
from dev (driver name followed by the bus_id, to be precise). If you set it
up before calling v4l2_device_register then it will be untouched. If dev is
NULL, then you *must* setup v4l2_dev->name before calling v4l2_device_register.
The first 'dev' argument is normally the struct device pointer of a pci_dev,
usb_device or platform_device.
usb_device or platform_device. It is rare for dev to be NULL, but it happens
with ISA devices or when one device creates multiple PCI devices, thus making
it impossible to associate v4l2_dev with a particular parent.
You can also supply a notify() callback that can be called by sub-devices to
notify you of events. Whether you need to set this depends on the sub-device.
Any notifications a sub-device supports must be defined in a header in
You unregister with:
......@@ -95,6 +105,17 @@ You unregister with:
Unregistering will also automatically unregister all subdevs from the device.
If you have a hotpluggable device (e.g. a USB device), then when a disconnect
happens the parent device becomes invalid. Since v4l2_device has a pointer to
that parent device it has to be cleared as well to mark that the parent is
gone. To do this call:
v4l2_device_disconnect(struct v4l2_device *v4l2_dev);
This does *not* unregister the subdevs, so you still need to call the
v4l2_device_unregister() function for that. If your driver is not hotpluggable,
then there is no need to call v4l2_device_disconnect().
Sometimes you need to iterate over all devices registered by a specific
driver. This is usually the case if multiple device drivers use the same
hardware. E.g. the ivtvfb driver is a framebuffer driver that uses the ivtv
......@@ -134,7 +155,7 @@ The recommended approach is as follows:
static atomic_t drv_instance = ATOMIC_INIT(0);
static int __devinit drv_probe(struct pci_dev *dev,
static int __devinit drv_probe(struct pci_dev *pdev,
const struct pci_device_id *pci_id)
......@@ -218,7 +239,7 @@ to add new ops and categories.
A sub-device driver initializes the v4l2_subdev struct using:
v4l2_subdev_init(subdev, &ops);
v4l2_subdev_init(sd, &ops);
Afterwards you need to initialize subdev->name with a unique name and set the
module owner. This is done for you if you use the i2c helper functions.
......@@ -226,7 +247,7 @@ module owner. This is done for you if you use the i2c helper functions.
A device (bridge) driver needs to register the v4l2_subdev with the
int err = v4l2_device_register_subdev(device, subdev);
int err = v4l2_device_register_subdev(v4l2_dev, sd);
This can fail if the subdev module disappeared before it could be registered.
After this function was called successfully the subdev->dev field points to
......@@ -234,17 +255,17 @@ the v4l2_device.
You can unregister a sub-device using:
Afterwards the subdev module can be unloaded and subdev->dev == NULL.
Afterwards the subdev module can be unloaded and sd->dev == NULL.
You can call an ops function either directly:
err = subdev->ops->core->g_chip_ident(subdev, &chip);
err = sd->ops->core->g_chip_ident(sd, &chip);
but it is better and easier to use this macro:
err = v4l2_subdev_call(subdev, core, g_chip_ident, &chip);
err = v4l2_subdev_call(sd, core, g_chip_ident, &chip);
The macro will to the right NULL pointer checks and returns -ENODEV if subdev
is NULL, -ENOIOCTLCMD if either subdev->core or subdev->core->g_chip_ident is
......@@ -252,19 +273,19 @@ NULL, or the actual result of the subdev->ops->core->g_chip_ident ops.
It is also possible to call all or a subset of the sub-devices:
v4l2_device_call_all(dev, 0, core, g_chip_ident, &chip);
v4l2_device_call_all(v4l2_dev, 0, core, g_chip_ident, &chip);
Any subdev that does not support this ops is skipped and error results are
ignored. If you want to check for errors use this:
err = v4l2_device_call_until_err(dev, 0, core, g_chip_ident, &chip);
err = v4l2_device_call_until_err(v4l2_dev, 0, core, g_chip_ident, &chip);
Any error except -ENOIOCTLCMD will exit the loop with that error. If no
errors (except -ENOIOCTLCMD) occured, then 0 is returned.
The second argument to both calls is a group ID. If 0, then all subdevs are
called. If non-zero, then only those whose group ID match that value will
be called. Before a bridge driver registers a subdev it can set subdev->grp_id
be called. Before a bridge driver registers a subdev it can set sd->grp_id
to whatever value it wants (it's 0 by default). This value is owned by the
bridge driver and the sub-device driver will never modify or use it.
......@@ -276,6 +297,11 @@ e.g. AUDIO_CONTROLLER and specify that as the group ID value when calling
v4l2_device_call_all(). That ensures that it will only go to the subdev
that needs it.
If the sub-device needs to notify its v4l2_device parent of an event, then
it can call v4l2_subdev_notify(sd, notification, arg). This macro checks
whether there is a notify() callback defined and returns -ENODEV if not.
Otherwise the result of the notify() call is returned.
The advantage of using v4l2_subdev is that it is a generic struct and does
not contain any knowledge about the underlying hardware. So a driver might
contain several subdevs that use an I2C bus, but also a subdev that is
......@@ -340,6 +366,12 @@ Make sure to call v4l2_device_unregister_subdev(sd) when the remove() callback
is called. This will unregister the sub-device from the bridge driver. It is
safe to call this even if the sub-device was never registered.
You need to do this because when the bridge driver destroys the i2c adapter
the remove() callbacks are called of the i2c devices on that adapter.
After that the corresponding v4l2_subdev structures are invalid, so they
have to be unregistered first. Calling v4l2_device_unregister_subdev(sd)
from the remove() callback ensures that this is always done correctly.
The bridge driver also has some helper functions it can use:
......@@ -349,8 +381,8 @@ 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. It gets
the v4l2_device by calling i2c_get_adapdata(adapter), so you should make sure
that adapdata is set to v4l2_device when you setup the i2c_adapter in your
to call i2c_set_adapdata(adapter, v4l2_device) when you setup the i2c_adapter
in your driver.
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
......@@ -358,6 +390,14 @@ that it should probe. Internally it calls i2c_new_probed_device().
Both functions return NULL if something went wrong.
Note that the chipid you pass to v4l2_i2c_new_(probed_)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
later date. It differs between i2c drivers and as such can be confusing.
To see which chip variants are supported you can look in the i2c driver code
for the i2c_device_id table. This lists all the possibilities.
struct video_device
......@@ -396,6 +436,15 @@ You should also set these fields:
- ioctl_ops: if you use the v4l2_ioctl_ops to simplify ioctl maintenance
(highly recommended to use this and it might become compulsory in the
future!), then set this to your v4l2_ioctl_ops struct.
- parent: you only set this if v4l2_device was registered with NULL as
the parent device struct. This only happens in cases where one hardware
device has multiple PCI devices that all share the same v4l2_device core.
The cx88 driver is an example of this: one core v4l2_device struct, but
it is used by both an raw video PCI device (cx8800) and a MPEG PCI device
(cx8802). Since the v4l2_device cannot be associated with a particular
PCI device it is setup without a parent device. But when the struct
video_device is setup you do know which parent PCI device to use.
If you use v4l2_ioctl_ops, then you should set either .unlocked_ioctl or
.ioctl to video_ioctl2 in your v4l2_file_operations struct.
......@@ -499,8 +548,8 @@ There are a few useful helper functions:
You can set/get driver private data in the video_device struct using:
void *video_get_drvdata(struct video_device *dev);
void video_set_drvdata(struct video_device *dev, void *data);
void *video_get_drvdata(struct video_device *vdev);
void video_set_drvdata(struct video_device *vdev, void *data);
Note that you can safely call video_set_drvdata() before calling
......@@ -519,3 +568,103 @@ void *video_drvdata(struct file *file);
You can go from a video_device struct to the v4l2_device struct using:
struct v4l2_device *v4l2_dev = vdev->v4l2_dev;
video buffer helper functions
The v4l2 core API provides a standard method for dealing with video
buffers. Those methods allow a driver to implement read(), mmap() and
overlay() on a consistent way.
There are currently methods for using video buffers on devices that
supports DMA with scatter/gather method (videobuf-dma-sg), DMA with
linear access (videobuf-dma-contig), and vmalloced buffers, mostly
used on USB drivers (videobuf-vmalloc).
Any driver using videobuf should provide operations (callbacks) for
four handlers:
ops->buf_setup - calculates the size of the video buffers and avoid they
to waste more than some maximum limit of RAM;
ops->buf_prepare - fills the video buffer structs and calls
videobuf_iolock() to alloc and prepare mmaped memory;
ops->buf_queue - advices the driver that another buffer were
requested (by read() or by QBUF);
ops->buf_release - frees any buffer that were allocated.
In order to use it, the driver need to have a code (generally called at
interrupt context) that will properly handle the buffer request lists,
announcing that a new buffer were filled.
The irq handling code should handle the videobuf task lists, in order
to advice videobuf that a new frame were filled, in order to honor to a
request. The code is generally like this one:
if (list_empty(&dma_q->active))
buf = list_entry(dma_q->, struct vbuffer, vb.queue);
if (!waitqueue_active(&buf->vb.done))
/* Some logic to handle the buf may be needed here */
Those are the videobuffer functions used on drivers, implemented on
- Videobuf init functions
Initializes the videobuf infrastructure. This function should be
called before any other videobuf function on drivers that uses DMA
Scatter/Gather buffers.
Initializes the videobuf infrastructure. This function should be
called before any other videobuf function on drivers that need DMA
contiguous buffers.
Initializes the videobuf infrastructure. This function should be
called before any other videobuf function on USB (and other drivers)
that need a vmalloced type of videobuf.
- videobuf_iolock()
Prepares the videobuf memory for the proper method (read, mmap, overlay).
- videobuf_queue_is_busy()
Checks if a videobuf is streaming.
- videobuf_queue_cancel()
Stops video handling.
- videobuf_mmap_free()
frees mmap buffers.
- videobuf_stop()
Stops video handling, ends mmap and frees mmap and other buffers.
- V4L2 api functions. Those functions correspond to VIDIOC_foo ioctls:
videobuf_reqbufs(), videobuf_querybuf(), videobuf_qbuf(),
videobuf_dqbuf(), videobuf_streamon(), videobuf_streamoff().
- V4L1 api function (corresponds to VIDIOCMBUF ioctl):
This function is used to provide backward compatibility with V4L1
- Some help functions for read()/poll() operations:
For continuous stream read()
For snapshot read()