Staging: easycap: add easycap driver

This adds the easycap USB video adapter driver to
the staging directory.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/Kconfig

@@ -149,5 +149,7 @@ source "drivers/staging/mrst-touchscreen/Kconfig"
 
 source "drivers/staging/msm/Kconfig"
 
+source "drivers/staging/easycap/Kconfig"
+
 endif # !STAGING_EXCLUDE_BUILD
 endif # STAGING

drivers/staging/Makefile

@@ -55,3 +55,4 @@ obj-$(CONFIG_ADIS16255)		+= adis16255/
 obj-$(CONFIG_FB_XGI)		+= xgifb/
 obj-$(CONFIG_TOUCHSCREEN_MRSTOUCH)	+= mrst-touchscreen/
 obj-$(CONFIG_MSM_STAGING)	+= msm/
+obj-$(CONFIG_EASYCAP)		+= easycap/

drivers/staging/easycap/Kconfig

@@ -0,0 +1,16 @@
+config EASYCAP
+	tristate "EasyCAP USB ID 05e1:0408 support"
+
+	---help---
+	  This is an integrated audio/video driver for EasyCAP cards with
+	  USB ID 05e1:0408.  It supports two hardware variants:
+
+	  *  EasyCAP USB 2.0 Video Adapter with Audio, Model DC60,
+	     having input cables labelled CVBS, S-VIDEO, AUDIO(L), AUDIO(R)
+
+	  *  EasyCAP002 4-Channel USB 2.0 DVR, having input cables labelled
+	     1, 2, 3, 4 and an unlabelled input cable for a microphone.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called easycap
+

drivers/staging/easycap/Makefile

@@ -0,0 +1,13 @@
+
+obj-$(CONFIG_EASYCAP)	+= easycap.o
+
+easycap-objs	:= easycap_main.o easycap_low.o easycap_sound.o
+easycap-objs	+= easycap_ioctl.o easycap_settings.o
+easycap-objs	+= easycap_testcard.o
+
+EXTRA_CFLAGS += -Wall
+# Impose all or none of the following:
+EXTRA_CFLAGS += -DEASYCAP_IS_VIDEODEV_CLIENT
+EXTRA_CFLAGS += -DEASYCAP_NEEDS_V4L2_DEVICE_H
+EXTRA_CFLAGS += -DEASYCAP_NEEDS_V4L2_FOPS
+

drivers/staging/easycap/README

@@ -0,0 +1,130 @@
+
+        ***********************************************************
+        *   EasyCAP USB 2.0 Video Adapter with Audio, Model DC60  *
+        *                            and                          *
+        *             EasyCAP002 4-Channel USB 2.0 DVR            *
+        ***********************************************************
+                     Mike Thomas  <rmthomas@sciolus.org>
+
+
+
+SUPPORTED HARDWARE
+------------------
+
+This driver is intended for use with hardware having USB ID 05e1:0408.
+Two kinds of EasyCAP have this USB ID, namely:
+
+    *  EasyCAP USB 2.0 Video Adapter with Audio, Model DC60,
+       having input cables labelled CVBS, S-VIDEO, AUDIO(L), AUDIO(R)
+
+    *  EasyCAP002 4-Channel USB 2.0 DVR, having input cables labelled
+       1, 2, 3, 4 and an unlabelled input cable for a microphone.
+
+
+BUILD OPTIONS AND DEPENDENCIES
+------------------------------
+
+If the parameter EASYCAP_IS_VIDEODEV_CLIENT is undefined during compilation
+the built module is entirely independent of the videodev module, and when
+the EasyCAP is physically plugged into a USB port the special files
+/dev/easycap0 and /dev/easysnd1 are created as video and sound sources
+respectively.
+
+If the parameter EASYCAP_IS_VIDEODEV_CLIENT is defined during compilation
+the built easycap module is configured to register with the videodev module,
+in which case the special files created when the EasyCAP is plugged in are
+/dev/video0 and /dev/easysnd0.  Use of the easycap module as a client of
+the videodev module has received very little testing as of June 2010.
+
+
+KNOWN BUILD PROBLEMS
+--------------------
+
+(1) Recent gcc versions may generate the message:
+
+     warning: the frame size of .... bytes is larger than 1024 bytes
+
+This warning can be suppressed by specifying in the Makefile:
+
+     EXTRA_CFLAGS += -Wframe-larger-than=8192
+
+but it would be preferable to remove the cause of the warning.
+
+
+KNOWN RUNTIME ISSUES
+--------------------
+
+(1) Randomly (maybe 5 to 10% of occasions) the driver fails to produce any
+output at start-up.  Closing mplayer (or whatever the user program is) and
+restarting it restores normal performance without any other remedial action
+being necessary.  The reason for this is not known.
+
+(2) Intentionally, this driver will not stream material which is unambiguously
+identified by the hardware as copy-protected.  The video output will freeze
+within about a minute when this situation arises.
+
+(3) The controls for luminance, contrast, saturation, hue and volume may not
+always work properly.
+
+(4) Reduced-resolution S-Video seems to suffer from moire artefacts.  No
+attempt has yet been made to rememdy this.
+
+
+SUPPORTED TV STANDARDS AND RESOLUTIONS
+--------------------------------------
+
+The following TV standards are natively supported by the hardware and are
+usable as (for example) the "norm=" parameter in the mplayer command:
+
+    PAL_BGHIN,    NTSC_N_443,
+    PAL_Nc,       NTSC_N,
+    SECAM,        NTSC_M,        NTSC_M_JP,
+    PAL_60,       NTSC_443,
+    PAL_M.
+
+The available picture sizes are:
+
+     at 25 frames per second:   720x576, 704x576, 640x480, 360x288, 320x240;
+     at 30 frames per second:   720x480, 640x480, 360x240, 320x240;
+
+
+WHAT'S TESTED AND WHAT'S NOT
+----------------------------
+
+This driver is known to work with mplayer, mencoder, tvtime and sufficiently
+recent versions of vlc.  An interface to ffmpeg is implemented, but serious
+audio-video synchronization problems remain.
+
+The driver is designed to support all the TV standards accepted by the
+hardware, but as yet it has actually been tested on only a few of these.
+
+I have been unable to test and calibrate the S-video input myself because I
+do not possess any equipment with S-video output.
+
+This driver does not understand the V4L1 IOCTL commands, so programs such
+as camorama are not compatible.  There are reports that the driver does
+work with sufficiently recent (V4L2) versions of zoneminder, but I have not
+attempted to confirm this myself.
+
+
+UDEV RULES
+----------
+
+In order that the special files /dev/easycap0 and /dev/easysnd1 are created
+with conveniently relaxed permissions when the EasyCAP is plugged in, a file
+is preferably to be provided in directory /etc/udev/rules.d with content:
+
+ACTION!="add|change", GOTO="easycap_rules_end"
+ATTRS{idVendor}=="05e1", ATTRS{idProduct}=="0408", \
+	MODE="0666", OWNER="root", GROUP="root"
+LABEL="easycap_rules_end"
+
+
+ACKNOWLEGEMENTS AND REFERENCES
+------------------------------
+This driver makes use of information contained in the Syntek Semicon DC-1125
+Driver, presently maintained at http://sourceforge.net/projects/syntekdriver/
+by Nicolas Vivien.  Particularly useful has been a patch to the latter driver
+provided by Ivor Hewitt in January 2009.  The NTSC implementation is taken
+from the work of Ben Trask.
+