Initial import

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

10 files changed, 1574 insertions, 0 deletions

diff --git a/COPYING.GPL b/COPYING.GPL
new file mode 100644
index 0000000..d511905
--- /dev/null
+++ b/COPYING.GPL
@@ -0,0 +1,339 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
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+means either the Program or any derivative work under copyright law:
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+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
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+
+You may charge a fee for the physical act of transferring a copy, and
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+
+  2. You may modify your copy or copies of the Program or any portion
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+
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+
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+
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+These requirements apply to the modified work as a whole.  If
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+
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+
+  6. Each time you redistribute the Program (or any work based on the
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+
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+
+This section is intended to make thoroughly clear what is believed to
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+
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+countries not thus excluded.  In such case, this License incorporates
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+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
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+address new problems or concerns.
+
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+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
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+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
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+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
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+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
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+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
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+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
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+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..bf4cf55
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,19 @@
+SRCARCH ?= arm
+CROSS_COMPILE ?= arm-none-linux-gnueabi-
+KDIR ?= /usr/src/linux
+
+KINC := -I$(KDIR)/include -I$(KDIR)/arch/$(SRCARCH)/include
+CC   := $(CROSS_COMPILE)gcc
+
+CFLAGS = -O2 -Wall -fpic -I. $(KINC)
+OBJS = media.o main.o options.o subdev.o
+
+all: media-ctl
+
+media-ctl: $(OBJS)
+	$(CC) $(CFLAGS) -o media-ctl $(OBJS)
+	$(CROSS_COMPILE)strip media-ctl
+clean:
+	rm -f $(OBJS) media-ctl
+
+.PHONY: clean all
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..ab76c84
--- /dev/null
+++ b/main.c
@@ -0,0 +1,402 @@
+/*
+ * Media controller test application
+ *
+ * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ */
+
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <linux/types.h>
+#include <linux/media.h>
+#include <linux/v4l2-mediabus.h>
+#include <linux/v4l2-subdev.h>
+#include <linux/videodev2.h>
+
+#include "media.h"
+#include "options.h"
+#include "subdev.h"
+#include "tools.h"
+
+/* -----------------------------------------------------------------------------
+ * Links setup
+ */
+
+static struct media_entity_pad *parse_pad(struct media_device *media, const char *p, char **endp)
+{
+	unsigned int entity_id, pad;
+	struct media_entity *entity;
+	char *end;
+
+	for (; isspace(*p); ++p);
+
+	if (*p == '"') {
+		for (end = (char *)p + 1; *end && *end != '"'; ++end);
+		if (*end != '"')
+			return NULL;
+
+		entity = media_get_entity_by_name(media, p + 1, end - p - 1);
+		if (entity == NULL)
+			return NULL;
+
+		for (++end; isspace(*end); ++end);
+	} else {
+		entity_id = strtoul(p, &end, 10) - 1;
+		if (entity_id >= media->entities_count)
+			return NULL;
+
+		entity = &media->entities[entity_id];
+	}
+
+	if (*end != ':')
+		return NULL;
+	for (p = end + 1; isspace(*p); ++p);
+
+	pad = strtoul(p, &end, 10);
+	for (p = end; isspace(*p); ++p);
+
+	if (pad >= entity->info.pads)
+		return NULL;
+
+	for (p = end; isspace(*p); ++p);
+	*endp = (char *)p;
+
+	return &entity->pads[pad];
+}
+
+static struct media_entity_link *parse_link(struct media_device *media, const char *p, char **endp)
+{
+	struct media_entity_link *link;
+	struct media_entity_pad *source;
+	struct media_entity_pad *sink;
+	unsigned int i;
+	char *end;
+
+	source = parse_pad(media, p, &end);
+	if (source == NULL)
+		return NULL;
+
+	if (end[0] != '-' || end[1] != '>')
+		return NULL;
+	p = end + 2;
+
+	sink = parse_pad(media, p, &end);
+	if (sink == NULL)
+		return NULL;
+
+	*endp = end;
+
+	for (i = 0; i < source->entity->info.links; i++) {
+		link = &source->entity->links[i];
+
+		if (link->source == source && link->sink == sink)
+			return link;
+	}
+
+	return NULL;
+}
+
+static int setup_link(struct media_device *media, const char *p, char **endp)
+{
+	struct media_entity_link *link;
+	__u32 flags;
+	char *end;
+
+	link = parse_link(media, p, &end);
+	if (link == NULL) {
+		printf("Unable to parse link\n");
+		return -EINVAL;
+	}
+
+	p = end;
+	if (*p++ != '[') {
+		printf("Unable to parse link flags\n");
+		return -EINVAL;
+	}
+
+	flags = strtoul(p, &end, 10);
+	for (p = end; isspace(*p); p++);
+	if (*p++ != ']') {
+		printf("Unable to parse link flags\n");
+		return -EINVAL;
+	}
+
+	for (; isspace(*p); p++);
+	*endp = (char *)p;
+
+	printf("Setting up link %u:%u -> %u:%u [%u]\n",
+		link->source->entity->info.id, link->source->index,
+		link->sink->entity->info.id, link->sink->index,
+		flags);
+
+	return media_setup_link(media, link->source, link->sink, flags);
+}
+
+static int setup_links(struct media_device *media, const char *p)
+{
+	char *end;
+	int ret;
+
+	do {
+		ret = setup_link(media, p, &end);
+		if (ret < 0)
+			return ret;
+
+		p = end + 1;
+	} while (*end == ',');
+
+	return *end ? -EINVAL : 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Formats setup
+ */
+
+static struct {
+	const char *name;
+	enum v4l2_mbus_pixelcode code;
+} mbus_formats[] = {
+	{ "YUYV", V4L2_MBUS_FMT_YUYV16_1X16 },
+	{ "UYVY", V4L2_MBUS_FMT_UYVY16_1X16 },
+	{ "SGRBG10", V4L2_MBUS_FMT_SGRBG10_1X10 },
+	{ "SGRBG10_DPCM8", V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8 },
+};
+
+static const char *pixelcode_to_string(enum v4l2_mbus_pixelcode code)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(mbus_formats); ++i) {
+		if (mbus_formats[i].code == code)
+			return mbus_formats[i].name;
+	}
+
+	return "unknown";
+}
+
+static int parse_format(struct v4l2_mbus_framefmt *format, const char *p, char **endp)
+{
+	unsigned int width, height;
+	unsigned int i;
+	char *end;
+
+	for (; isspace(*p); ++p);
+	for (end = (char *)p; !isspace(*end) && *end != '\0'; ++end);
+
+	for (i = 0; i < ARRAY_SIZE(mbus_formats); ++i) {
+		if (strncmp(mbus_formats[i].name, p, end - p) == 0)
+			break;
+	}
+
+	if (i == ARRAY_SIZE(mbus_formats))
+		return -EINVAL;
+
+	for (p = end; isspace(*p); ++p);
+	width = strtoul(p, &end, 10);
+	if (*end != 'x')
+		return -EINVAL;
+
+	p = end + 1;
+	height = strtoul(p, &end, 10);
+	*endp = end;
+
+	format->width = width;
+	format->height = height;
+	format->code = mbus_formats[i].code;
+
+	return 0;
+}
+
+static struct media_entity_pad *parse_pad_format(struct media_device *media,
+	struct v4l2_mbus_framefmt *format, const char *p, char **endp)
+{
+	struct media_entity_pad *pad;
+	char *end;
+	int ret;
+
+	for (; isspace(*p); ++p);
+
+	pad = parse_pad(media, p, &end);
+	if (pad == NULL)
+		return NULL;
+
+	for (p = end; isspace(*p); ++p);
+	if (*p++ != '[')
+		return NULL;
+
+	ret = parse_format(format, p, &end);
+	if (ret < 0)
+		return NULL;
+
+	for (p = end; isspace(*p); p++);
+	if (*p++ != ']')
+		return NULL;
+
+	*endp = (char *)p;
+	return pad;
+}
+
+static int set_format(struct media_entity_pad *pad, struct v4l2_mbus_framefmt *format)
+{
+	int ret;
+
+	printf("Setting up format %s %ux%u on pad %s/%u\n",
+		pixelcode_to_string(format->code), format->width, format->height,
+		pad->entity->info.name, pad->index);
+
+	ret = v4l2_subdev_set_format(pad->entity, format, pad->index,
+				     V4L2_SUBDEV_FORMAT_ACTIVE);
+	if (ret < 0) {
+		printf("Unable to set format: %s(%u)", strerror(ret), ret);
+		return ret;
+	}
+
+	printf("Format set: %s %ux%u\n",
+		pixelcode_to_string(format->code), format->width, format->height);
+
+	return 0;
+}
+
+static int setup_format(struct media_device *media, const char *p, char **endp)
+{
+	struct v4l2_mbus_framefmt format;
+	struct media_entity_pad *pad;
+	unsigned int i;
+	char *end;
+	int ret;
+
+	pad = parse_pad_format(media, &format, p, &end);
+	if (pad == NULL) {
+		printf("Unable to parse format\n");
+		return -EINVAL;
+	}
+
+	ret = set_format(pad, &format);
+	if (ret < 0)
+		return ret;
+
+	/* If the pad is an output pad, automatically set the same format on
+	 * the remote inputs, if any.
+	 */
+	if (pad->type == MEDIA_PAD_TYPE_OUTPUT) {
+		for (i = 0; i < pad->entity->info.links; ++i) {
+			struct media_entity_link *link = &pad->entity->links[i];
+			struct v4l2_mbus_framefmt remote_format;
+
+			if (!(link->flags & MEDIA_LINK_FLAG_ACTIVE))
+				continue;
+
+			if (link->source == pad) {
+				remote_format = format;
+				set_format(link->sink, &remote_format);
+			}
+		}
+	}
+
+	*endp = end;
+	return 0;
+}
+
+static int setup_formats(struct media_device *media, const char *p)
+{
+	char *end;
+	int ret;
+
+	do {
+		ret = setup_format(media, p, &end);
+		if (ret < 0) {
+			printf("Unable to parse format\n");
+			return ret;
+		}
+
+		p = end + 1;
+	} while (*end == ',');
+
+	return *end ? -EINVAL : 0;
+}
+
+int main(int argc, char **argv)
+{
+	struct media_device *media;
+
+	if (parse_cmdline(argc, argv))
+		return EXIT_FAILURE;
+
+	/* Open the media device and enumerate entities, pads and links. */
+	media = media_open(media_opts.devname, media_opts.verbose);
+	if (media == NULL)
+		goto out;
+
+	if (media_opts.entity) {
+		struct media_entity *entity;
+
+		entity = media_get_entity_by_name(media, media_opts.entity,
+						  strlen(media_opts.entity));
+		if (entity != NULL)
+			printf("%s\n", entity->devname);
+		else
+			printf("Entity '%s' not found\n", media_opts.entity);
+	}
+
+	if (media_opts.print) {
+		media_print_topology(media);
+		printf("\n");
+	}
+
+	if (media_opts.reset) {
+		printf("Resetting all links to inactive\n");
+		media_reset_links(media);
+	}
+
+	if (media_opts.links)
+		setup_links(media, media_opts.links);
+
+	if (media_opts.formats)
+		setup_formats(media, media_opts.formats);
+
+	if (media_opts.interactive) {
+		while (1) {
+			char buffer[32];
+			char *end;
+
+			printf("Enter a link to modify or enter to stop\n");
+			if (fgets(buffer, sizeof buffer, stdin) == NULL)
+				break;
+
+			if (buffer[0] == '\n')
+				break;
+
+			setup_link(media, buffer, &end);
+		}
+	}
+
+out:
+	if (media)
+		media_close(media);
+
+	exit(EXIT_SUCCESS);
+}
+
diff --git a/media.c b/media.c
new file mode 100644
index 0000000..81c730c
--- /dev/null
+++ b/media.c
@@ -0,0 +1,433 @@
+/*
+ * Media controller test application
+ *
+ * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ */
+
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <linux/videodev2.h>
+#include <linux/media.h>
+
+#include "media.h"
+#include "tools.h"
+
+static const char *media_entity_type_to_string(unsigned type)
+{
+	static const struct {
+		__u32 type;
+		const char *name;
+	} types[] = {
+		{ MEDIA_ENTITY_TYPE_NODE, "Node" },
+		{ MEDIA_ENTITY_TYPE_SUBDEV, "V4L2 subdev" },
+	};
+
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(types); i++) {
+		if (types[i].type == type)
+			return types[i].name;
+	}
+
+	return "Unknown";
+}
+
+static const char *media_entity_subtype_to_string(unsigned type, unsigned subtype)
+{
+	static const char *node_types[] = {
+		"Unknown",
+		"V4L",
+		"FB",
+		"ALSA",
+		"DVB",
+	};
+	static const char *subdev_types[] = {
+		"Unknown",
+		"Video Decoder",
+		"Video Encoder",
+		"Miscellaneous",
+	};
+
+	switch (type) {
+	case MEDIA_ENTITY_TYPE_NODE:
+		if (subtype > 4)
+			subtype = 0;
+		return node_types[subtype];
+
+	case MEDIA_ENTITY_TYPE_SUBDEV:
+		if (subtype > 3)
+			subtype = 0;
+		return subdev_types[subtype];
+	default:
+		return node_types[0];
+	}
+}
+
+/*
+ * media_entity_remote_pad -
+ */
+struct media_entity_pad *media_entity_remote_pad(struct media_entity_pad *pad)
+{
+	unsigned int i;
+
+	for (i = 0; i < pad->entity->info.links; ++i) {
+		struct media_entity_link *link = &pad->entity->links[i];
+
+		if (!(link->flags & MEDIA_LINK_FLAG_ACTIVE))
+			continue;
+
+		if (link->source == pad)
+			return link->sink;
+
+		if (link->sink == pad)
+			return link->source;
+	}
+
+	return NULL;
+}
+
+/*
+ * media_entity_by_name -
+ */
+struct media_entity *media_get_entity_by_name(struct media_device *media,
+					      const char *name, size_t length)
+{
+	unsigned int i;
+
+	for (i = 0; i < media->entities_count; ++i) {
+		struct media_entity *entity = &media->entities[i];
+
+		if (strncmp(entity->info.name, name, length) == 0)
+			return entity;
+	}
+
+	return NULL;
+}
+
+/*
+ * media_setup_link -
+ */
+int media_setup_link(struct media_device *media,
+		     struct media_entity_pad *source,
+		     struct media_entity_pad *sink,
+		     __u32 flags)
+{
+	struct media_entity_link *link;
+	struct media_user_link ulink;
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < source->entity->info.links; i++) {
+		link = &source->entity->links[i];
+
+		if (link->source->entity == source->entity &&
+		    link->source->index == source->index &&
+		    link->sink->entity == sink->entity &&
+		    link->sink->index == sink->index)
+			break;
+	}
+
+	if (i == source->entity->info.links) {
+		printf("%s: Link not found\n", __func__);
+		return -EINVAL;
+	}
+
+	/* source pad */
+	ulink.source.entity = source->entity->info.id;
+	ulink.source.index = source->index;
+	ulink.source.type = MEDIA_PAD_TYPE_OUTPUT;
+
+	/* sink pad */
+	ulink.sink.entity = sink->entity->info.id;
+	ulink.sink.index = sink->index;
+	ulink.sink.type = MEDIA_PAD_TYPE_INPUT;
+
+	ulink.flags = flags | (link->flags & MEDIA_LINK_FLAG_IMMUTABLE);
+
+	ret = ioctl(media->fd, MEDIA_IOC_SETUP_LINK, &ulink);
+	if (ret < 0) {
+		printf("%s: Unable to setup link (%s)\n", __func__,
+			strerror(errno));
+		return ret;
+	}
+
+	link->flags = flags;
+	return 0;
+}
+
+int media_reset_links(struct media_device *media)
+{
+	unsigned int i, j;
+	int ret;
+
+	for (i = 0; i < media->entities_count; ++i) {
+		struct media_entity *entity = &media->entities[i];
+
+		for (j = 0; j < entity->info.links; j++) {
+			struct media_entity_link *link = &entity->links[j];
+
+			if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE)
+				continue;
+
+			ret = media_setup_link(media, link->source, link->sink,
+					       link->flags & ~MEDIA_LINK_FLAG_ACTIVE);
+			if (ret < 0)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
+void media_print_topology(struct media_device *media)
+{
+	unsigned int i, j, k;
+	unsigned int padding;
+
+	printf("Device topology\n");
+
+	for (i = 0; i < media->entities_count; ++i) {
+		struct media_entity *entity = &media->entities[i];
+
+		padding = printf("- entity %u: ", entity->info.id);
+		printf("%s (%u pad%s, %u link%s)\n", entity->info.name,
+			entity->info.pads, entity->info.pads > 1 ? "s" : "",
+			entity->info.links, entity->info.links > 1 ? "s" : "");
+		printf("%*ctype %s subtype %s\n", padding, ' ',
+			media_entity_type_to_string(entity->info.type),
+			media_entity_subtype_to_string(entity->info.type, entity->info.subtype));
+		if (entity->devname)
+			printf("%*cdevice node name %s\n", padding, ' ', entity->devname);
+
+		for (j = 0; j < entity->info.pads; j++) {
+			for (k = 0; k < entity->info.links; k++) {
+				struct media_entity_link *link = &entity->links[k];
+
+				if (link->source->entity != entity ||
+				    link->source->index != j)
+					continue;
+
+				printf("\tpad%u -> '%s':pad%u [", link->source->index,
+					link->sink->entity->info.name, link->sink->index);
+
+				if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE)
+					printf("IMMUTABLE,");
+				if (link->flags & MEDIA_LINK_FLAG_ACTIVE)
+					printf("ACTIVE");
+
+				printf("]\n");
+			}
+		}
+		printf("\n");
+	}
+}
+
+static int media_enum_links(struct media_device *media)
+{
+	__u32 id;
+	int ret = 0;
+
+	for (id = 1; id <= media->entities_count; id++) {
+		struct media_entity *entity = &media->entities[id - 1];
+		struct media_user_links links;
+		unsigned int i;
+
+		links.entity = entity->info.id;
+		links.pads = malloc(entity->info.pads * sizeof(struct media_user_pad));
+		links.links = malloc(entity->info.links * sizeof(struct media_user_link));
+
+		if (ioctl(media->fd, MEDIA_IOC_ENUM_LINKS, &links) < 0) {
+			printf("%s: Unable to enumerate pads and links (%s).\n",
+				__func__, strerror(errno));
+			free(links.pads);
+			free(links.links);
+			return -errno;
+		}
+
+		for (i = 0; i < entity->info.pads; ++i) {
+			entity->pads[i].entity = entity;
+			entity->pads[i].type = links.pads[i].type;
+			entity->pads[i].index = links.pads[i].index;
+		}
+
+		for (i = 0; i < entity->info.links; ++i) {
+			struct media_user_link *link = &links.links[i];
+			struct media_entity *source;
+			struct media_entity *sink;
+
+			if (link->source.entity > media->entities_count ||
+			    link->sink.entity > media->entities_count) {
+				printf("WARNING entity %u link %u from %u/%u to %u/%u is invalid!\n",
+					id, i, link->source.entity, link->source.index,
+					link->sink.entity, link->sink.index);
+				ret = -EINVAL;
+			}
+
+			source = &media->entities[link->source.entity - 1];
+			sink = &media->entities[link->sink.entity - 1];
+			entity->links[i].source = &source->pads[link->source.index];
+			entity->links[i].sink = &sink->pads[link->sink.index];
+			entity->links[i].flags = links.links[i].flags;
+		}
+
+		free(links.pads);
+		free(links.links);
+	}
+
+	return ret;
+}
+
+static int media_enum_entities(struct media_device *media)
+{
+	struct media_entity *entity;
+	struct stat devstat;
+	char devname[32];
+	unsigned int i;
+	__u32 id;
+	int ret;
+
+	for (id = 1; ; id++) {
+		media->entities =
+			realloc(media->entities, id * sizeof(*media->entities));
+		entity = &media->entities[id - 1];
+		memset(entity, 0, sizeof(*entity));
+		entity->fd = -1;
+		entity->info.id = id;
+
+		ret = ioctl(media->fd, MEDIA_IOC_ENUM_ENTITIES, &entity->info);
+		if (ret < 0) {
+			if (errno == EINVAL)
+				break;
+			return -errno;
+		}
+
+		entity->pads = malloc(entity->info.pads * sizeof(*entity->pads));
+		entity->links = malloc(entity->info.links * sizeof(*entity->links));
+		if (entity->pads == NULL || entity->links == NULL)
+			return -ENOMEM;
+
+		media->entities_count++;
+
+		/* Find the corresponding device name. */
+		if ((entity->info.type != MEDIA_ENTITY_TYPE_NODE ||
+		     entity->info.type != MEDIA_NODE_TYPE_V4L) &&
+		    (entity->info.type != MEDIA_ENTITY_TYPE_SUBDEV))
+			continue;
+
+		for (i = 0; i < 256; ++i) {
+			if (entity->info.type == MEDIA_ENTITY_TYPE_NODE)
+				sprintf(devname, "/dev/video%u", i);
+			else
+				sprintf(devname, "/dev/subdev%u", i);
+
+			ret = stat(devname, &devstat);
+			if (ret < 0)
+				continue;
+
+			if (major(devstat.st_rdev) == entity->info.v4l.major &&
+			    minor(devstat.st_rdev) == entity->info.v4l.minor) {
+				strcpy(entity->devname, devname);
+				break;
+			}
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * media_open -
+ */
+struct media_device *media_open(const char *name, int verbose)
+{
+	struct media_device *media;
+	int ret;
+
+	media = malloc(sizeof(*media));
+	if (media == NULL) {
+		printf("%s: unable to allocate memory\n", __func__);
+		return NULL;
+	}
+	memset(media, 0, sizeof(*media));
+
+	if (verbose)
+		printf("Opening media device %s\n", name);
+	media->fd = open(name, O_RDWR);
+	if (media->fd < 0) {
+		media_close(media);
+		printf("%s: Can't open media device %s\n", __func__, name);
+		return NULL;
+	}
+
+	if (verbose)
+		printf("Enumerating entities\n");
+
+	ret = media_enum_entities(media);
+	if (ret < 0) {
+		printf("%s: Unable to enumerate entities for device %s (%s)\n",
+			__func__, name, strerror(ret));
+		media_close(media);
+		return NULL;
+	}
+
+	if (verbose) {
+		printf("Found %u entities\n", media->entities_count);
+		printf("Enumerating pads and links\n");
+	}
+
+	ret = media_enum_links(media);
+	if (ret < 0) {
+		printf("%s: Unable to enumerate pads and linksfor device %s\n",
+			__func__, name);
+		media_close(media);
+		return NULL;
+	}
+
+	return media;
+}
+
+/*
+ * media_close -
+ */
+void media_close(struct media_device *media)
+{
+	unsigned int i;
+
+	if (media->fd != -1)
+		close(media->fd);
+
+	for (i = 0; i < media->entities_count; ++i) {
+		struct media_entity *entity = &media->entities[i];
+
+		free(entity->pads);
+		free(entity->links);
+		if (entity->fd != -1)
+			close(entity->fd);
+	}
+
+	free(media->entities);
+	free(media);
+}
+
diff --git a/media.h b/media.h
new file mode 100644
index 0000000..7217403
--- /dev/null
+++ b/media.h
@@ -0,0 +1,66 @@
+/*
+ * Media controller test application
+ *
+ * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ */
+
+#ifndef __MEDIA_H__
+#define __MEDIA_H__
+
+#include <linux/media.h>
+
+struct media_entity_link {
+	struct media_entity_pad *source;
+	struct media_entity_pad *sink;
+	__u32 flags;
+};
+
+struct media_entity_pad {
+	struct media_entity *entity;
+	__u32 type;
+	__u32 index;
+};
+
+struct media_entity {
+	struct media_user_entity info;
+	struct media_entity_pad *pads;
+	struct media_entity_link *links;
+
+	char devname[32];
+	int fd;
+};
+
+struct media_device {
+	int fd;
+	struct media_entity *entities;
+	unsigned int entities_count;
+};
+
+struct media_device *media_open(const char *name, int verbose);
+void media_close(struct media_device *media);
+
+struct media_entity_pad *media_entity_remote_pad(struct media_entity_pad *pad);
+
+struct media_entity *media_get_entity_by_name(struct media_device *media,
+	const char *name, size_t length);
+void media_print_topology(struct media_device *media);
+int media_setup_link(struct media_device *media,
+	struct media_entity_pad *source, struct media_entity_pad *sink,
+	__u32 flags);
+int media_reset_links(struct media_device *media);
+
+#endif
+
diff --git a/options.c b/options.c
new file mode 100644
index 0000000..c607dee
--- /dev/null
+++ b/options.c
@@ -0,0 +1,117 @@
+/*
+ * Media controller test application
+ *
+ * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ */
+
+#include <stdlib.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "options.h"
+
+#define MEDIA_DEVNAME_DEFAULT		"/dev/media0"
+
+struct media_options media_opts = {
+	.devname = MEDIA_DEVNAME_DEFAULT,
+};
+
+static void usage(const char *argv0)
+{
+	printf("%s [options] device\n", argv0);
+	printf("-d, --device dev	Media device name (default: %s)\n", MEDIA_DEVNAME_DEFAULT);
+	printf("-e, --entity name	Print the device name associated with the given entity\n");
+	printf("-f, --formats		Comma-separated list of formats to setup\n");
+	printf("-h, --help		Show this help screen\n");
+	printf("-i, --interactive	Modify links interactively\n");
+	printf("-l, --links		Comma-separated list of links descriptors to setup\n");
+	printf("-p, --print-topology	Print the device topology (implies -v)\n");
+	printf("-r, --reset		Reset all links to inactive\n");
+	printf("-v, --verbose		Be verbose\n");
+}
+
+static struct option opts[] = {
+	{"device", 1, 0, 'd'},
+	{"entity", 1, 0, 'e'},
+	{"formats", 1, 0, 'f'},
+	{"help", 0, 0, 'h'},
+	{"interactive", 0, 0, 'i'},
+	{"links", 1, 0, 'l'},
+	{"print-topology", 0, 0, 'p'},
+	{"reset", 0, 0, 'r'},
+	{"verbose", 0, 0, 'v'},
+};
+
+int parse_cmdline(int argc, char **argv)
+{
+	int opt;
+
+	if (argc == 1) {
+		usage(argv[0]);
+		return 1;
+	}
+
+	/* parse options */
+	while ((opt = getopt_long(argc, argv, "d:e:f:hil:prv", opts, NULL)) != -1) {
+		switch (opt) {
+		case 'd':
+			media_opts.devname = optarg;
+			break;
+
+		case 'e':
+			media_opts.entity = optarg;
+			break;
+
+		case 'f':
+			media_opts.formats = optarg;
+			break;
+
+		case 'h':
+			usage(argv[0]);
+			return 1;
+
+		case 'i':
+			media_opts.interactive = 1;
+			break;
+
+		case 'l':
+			media_opts.links = optarg;
+			break;
+
+		case 'p':
+			media_opts.print = 1;
+			media_opts.verbose = 1;
+			break;
+
+		case 'r':
+			media_opts.reset = 1;
+			break;
+
+		case 'v':
+			media_opts.verbose = 1;
+			break;
+
+		default:
+			printf("Invalid option -%c\n", opt);
+			printf("Run %s -h for help.\n", argv[0]);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
diff --git a/options.h b/options.h
new file mode 100644
index 0000000..a490a65
--- /dev/null
+++ b/options.h
@@ -0,0 +1,40 @@
+/*
+ * Media controller test application
+ *
+ * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ */
+
+#ifndef __OPTIONS_H
+#define __OPTIONS_H
+
+struct media_options
+{
+	const char *devname;
+	unsigned int interactive:1,
+		     print:1,
+		     reset:1,
+		     verbose:1;
+	const char *entity;
+	const char *formats;
+	const char *links;
+};
+
+extern struct media_options media_opts;
+
+extern int parse_cmdline(int argc, char **argv);
+
+#endif /* __OPTIONS_H */
+
diff --git a/subdev.c b/subdev.c
new file mode 100644
index 0000000..224b066
--- /dev/null
+++ b/subdev.c
@@ -0,0 +1,96 @@
+/*
+ * Media controller test application
+ *
+ * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ */
+
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <linux/v4l2-subdev.h>
+
+#include "media.h"
+#include "subdev.h"
+
+static int v4l2_subdev_open(struct media_entity *entity)
+{
+	if (entity->fd != -1)
+		return 0;
+
+	entity->fd = open(entity->devname, O_RDWR);
+	if (entity->fd == -1) {
+		printf("%s: Failed to open subdev device node %s\n", __func__,
+			entity->devname);
+		return errno;
+	}
+
+	return 0;
+}
+
+int v4l2_subdev_get_format(struct media_entity *entity,
+	struct v4l2_mbus_framefmt *format, unsigned int pad,
+	enum v4l2_subdev_format which)
+{
+	struct v4l2_subdev_pad_format fmt;
+	int ret;
+
+	ret = v4l2_subdev_open(entity);
+	if (ret < 0)
+		return ret;
+
+	memset(&fmt, 0, sizeof(fmt));
+	fmt.pad = pad;
+	fmt.which = which;
+
+	ret = ioctl(entity->fd, VIDIOC_SUBDEV_G_FMT, &fmt);
+	if (ret < 0)
+		return errno;
+
+	*format = fmt.format;
+	return 0;
+}
+
+int v4l2_subdev_set_format(struct media_entity *entity,
+	struct v4l2_mbus_framefmt *format, unsigned int pad,
+	enum v4l2_subdev_format which)
+{
+	struct v4l2_subdev_pad_format fmt;
+	int ret;
+
+	ret = v4l2_subdev_open(entity);
+	if (ret < 0)
+		return ret;
+
+	memset(&fmt, 0, sizeof(fmt));
+	fmt.pad = pad;
+	fmt.which = which;
+	fmt.format = *format;
+
+	ret = ioctl(entity->fd, VIDIOC_SUBDEV_S_FMT, &fmt);
+	if (ret < 0)
+		return errno;
+
+	*format = fmt.format;
+	return 0;
+}
+
diff --git a/subdev.h b/subdev.h
new file mode 100644
index 0000000..aeb92d3
--- /dev/null
+++ b/subdev.h
@@ -0,0 +1,35 @@
+/*
+ * Media controller test application
+ *
+ * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ */
+
+#ifndef __SUBDEV_H__
+#define __SUBDEV_H__
+
+#include <linux/v4l2-subdev.h>
+
+struct media_entity;
+
+int v4l2_subdev_get_format(struct media_entity *entity,
+	struct v4l2_mbus_framefmt *format, unsigned int pad,
+	enum v4l2_subdev_format which);
+int v4l2_subdev_set_format(struct media_entity *entity,
+	struct v4l2_mbus_framefmt *format, unsigned int pad,
+	enum v4l2_subdev_format which);
+
+#endif
+
diff --git a/tools.h b/tools.h
new file mode 100644
index 0000000..0a0a948
--- /dev/null
+++ b/tools.h
@@ -0,0 +1,27 @@
+/*
+ * Media controller test application
+ *
+ * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef __TOOLS_H__
+#define __TOOLS_H__
+
+#define ARRAY_SIZE(array)	(sizeof(array) / sizeof((array)[0]))
+
+#endif /* __TOOLS_H__ */
+