/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*!
* \file exynos_mc.c
* \brief source file for libexynosv4l2
* \author Jinsung Yang (jsgood.yang@samsung.com)
* \author Sangwoo Park (sw5771.park@samsung.com)
* \date 2012/01/17
*
* <b>Revision History: </b>
* - 2012/01/17: Jinsung Yang (jsgood.yang@samsung.com) \n
* Initial version
*
*/
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <media.h>
#include <linux/kdev_t.h>
#include <linux/types.h>
#include "exynos_v4l2.h"
//#define LOG_NDEBUG 0
#define LOG_TAG "libexynosv4l2-mc"
#include <utils/Log.h>
static inline unsigned int __media_entity_type(struct media_entity *entity)
{
return entity->info.type & MEDIA_ENT_TYPE_MASK;
}
static void __media_debug_default(void *ptr, ...)
{
va_list argptr;
va_start(argptr, ptr);
vprintf((const char*)ptr, argptr);
va_end(argptr);
}
static void __media_debug_set_handler(
struct media_device *media,
void (*debug_handler)(void *, ...),
void *debug_priv)
{
if (debug_handler) {
media->debug_handler = debug_handler;
media->debug_priv = debug_priv;
} else {
media->debug_handler = __media_debug_default;
media->debug_priv = NULL;
}
}
static struct media_link *__media_entity_add_link(struct media_entity *entity)
{
if (entity->num_links >= entity->max_links) {
struct media_link *links = entity->links;
unsigned int max_links = entity->max_links * 2;
unsigned int i;
links = (struct media_link*)realloc(links, max_links * sizeof *links);
if (links == NULL)
return NULL;
for (i = 0; i < entity->num_links; ++i)
links[i].twin->twin = &links[i];
entity->max_links = max_links;
entity->links = links;
}
return &entity->links[entity->num_links++];
}
static int __media_enum_links(struct media_device *media)
{
ALOGD("%s: start", __func__);
__u32 id;
int ret = 0;
for (id = 1; id <= media->entities_count; id++) {
struct media_entity *entity = &media->entities[id - 1];
struct media_links_enum links;
unsigned int i;
links.entity = entity->info.id;
links.pads = (struct media_pad_desc*)malloc(entity->info.pads * sizeof(struct media_pad_desc));
links.links = (struct media_link_desc*)malloc(entity->info.links * sizeof(struct media_link_desc));
if (ioctl(media->fd, MEDIA_IOC_ENUM_LINKS, &links) < 0) {
ALOGE("Unable to enumerate pads and links (%s)", 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].index = links.pads[i].index;
entity->pads[i].flags = links.pads[i].flags;
}
for (i = 0; i < entity->info.links; ++i) {
struct media_link_desc *link = &links.links[i];
struct media_link *fwdlink;
struct media_link *backlink;
struct media_entity *source;
struct media_entity *sink;
source = exynos_media_get_entity_by_id(media, link->source.entity);
sink = exynos_media_get_entity_by_id(media, link->sink.entity);
if (source == NULL || sink == NULL) {
ALOGE("WARNING entity %u link %u from %u/%u to %u/%u is invalid!",
id, i, link->source.entity,
link->source.index,
link->sink.entity,
link->sink.index);
ret = -EINVAL;
} else {
fwdlink = __media_entity_add_link(source);
fwdlink->source = &source->pads[link->source.index];
fwdlink->sink = &sink->pads[link->sink.index];
fwdlink->flags = link->flags;
backlink = __media_entity_add_link(sink);
backlink->source = &source->pads[link->source.index];
backlink->sink = &sink->pads[link->sink.index];
backlink->flags = link->flags;
fwdlink->twin = backlink;
backlink->twin = fwdlink;
}
}
free(links.pads);
free(links.links);
}
return ret;
}
static int __media_get_devname_sysfs(struct media_entity *entity)
{
//struct stat devstat;
char devname[32];
char sysname[32];
char target[1024];
char *p;
int ret;
sprintf(sysname, "/sys/dev/char/%u:%u", entity->info.v4l.major,
entity->info.v4l.minor);
ret = readlink(sysname, target, sizeof(target));
if (ret < 0)
return -errno;
target[ret] = '\0';
p = strrchr(target, '/');
if (p == NULL)
return -EINVAL;
sprintf(devname, "/tmp/%s", p + 1);
ret = mknod(devname, 0666 | S_IFCHR, MKDEV(81, entity->info.v4l.minor));
strcpy(entity->devname, devname);
return 0;
}
static int __media_get_media_fd(const char *filename, struct media_device *media)
{
ssize_t num;
int media_node;
char *ptr;
char media_buf[6];
ALOGD("%s: %s", __func__, filename);
media->fd = open(filename, O_RDWR, 0);
if (media->fd < 0) {
ALOGE("Open sysfs media device failed, media->fd: %d", media->fd);
return -1;
}
ALOGD("%s: media->fd: %d", __func__, media->fd);
return media->fd;
}
static int __media_enum_entities(struct media_device *media)
{
struct media_entity *entity, *temp_entity;
unsigned int size;
__u32 id;
int ret;
temp_entity = entity = (struct media_entity*)calloc(1, sizeof(struct media_entity));
for (id = 0, ret = 0; ; id = entity->info.id) {
size = (media->entities_count + 1) * sizeof(*media->entities);
media->entities = (struct media_entity*)realloc(media->entities, size);
entity = &media->entities[media->entities_count];
memset(entity, 0, sizeof(*entity));
entity->fd = -1;
entity->info.id = id | MEDIA_ENT_ID_FLAG_NEXT;
entity->media = media;
ret = ioctl(media->fd, MEDIA_IOC_ENUM_ENTITIES, &entity->info);
if (ret < 0) {
ret = errno != EINVAL ? -errno : 0;
break;
}
/* Number of links (for outbound links) plus number of pads (for
* inbound links) is a good safe initial estimate of the total
* number of links.
*/
entity->max_links = entity->info.pads + entity->info.links;
entity->pads = (struct media_pad*)malloc(entity->info.pads * sizeof(*entity->pads));
entity->links = (struct media_link*)malloc(entity->max_links * sizeof(*entity->links));
if (entity->pads == NULL || entity->links == NULL) {
ret = -ENOMEM;
break;
}
media->entities_count++;
/* Find the corresponding device name. */
if (__media_entity_type(entity) != MEDIA_ENT_T_DEVNODE &&
__media_entity_type(entity) != MEDIA_ENT_T_V4L2_SUBDEV)
continue;
/* Fall back to get the device name via sysfs */
__media_get_devname_sysfs(entity);
if (ret < 0)
ALOGE("media_get_devname failed");
}
free(temp_entity);
return ret;
}
static struct media_device *__media_open_debug(
const char *filename,
void (*debug_handler)(void *, ...),
void *debug_priv)
{
struct media_device *media;
int ret;
media = (struct media_device *)calloc(1, sizeof(struct media_device));
if (media == NULL) {
ALOGE("media: %p", media);
return NULL;
}
__media_debug_set_handler(media, debug_handler, debug_priv);
ALOGD("%s: Opening media device %s", __func__, filename);
ALOGD("%s: media: %p", __func__, media);
media->fd = __media_get_media_fd(filename, media);
if (media->fd < 0) {
exynos_media_close(media);
ALOGE("failed __media_get_media_fd %s", filename);
return NULL;
}
ALOGD("%s: media->fd: %d", __func__, media->fd);
ret = __media_enum_entities(media);
if (ret < 0) {
ALOGE("Unable to enumerate entities for device %s (%s)", filename, strerror(-ret));
exynos_media_close(media);
return NULL;
}
ALOGD("%s: Found %u entities", __func__, media->entities_count);
ALOGD("%s: Enumerating pads and links", __func__);
ret = __media_enum_links(media);
if (ret < 0) {
ALOGE("Unable to enumerate pads and links for device %s", filename);
exynos_media_close(media);
return NULL;
}
return media;
}
/**
* @brief Open a media device.
* @param filename - name (including path) of the device node.
*
* Open the media device referenced by @a filename and enumerate entities, pads and
* links.
*
* @return A pointer to a newly allocated media_device structure instance on
* success and NULL on failure. The returned pointer must be freed with
* exynos_media_close when the device isn't needed anymore.
*/
struct media_device *exynos_media_open(const char *filename)
{
return __media_open_debug(filename, (void (*)(void *, ...))fprintf, stdout);
}
/**
* @brief Close a media device.
* @param media - device instance.
*
* Close the @a media device instance and free allocated resources. Access to the
* device instance is forbidden after this function returns.
*/
void exynos_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);
}
/**
* @brief Locate the pad at the other end of a link.
* @param pad - sink pad at one end of the link.
*
* Locate the source pad connected to @a pad through an enabled link. As only one
* link connected to a sink pad can be enabled at a time, the connected source
* pad is guaranteed to be unique.
*
* @return A pointer to the connected source pad, or NULL if all links connected
* to @a pad are disabled. Return NULL also if @a pad is not a sink pad.
*/
struct media_pad *exynos_media_entity_remote_source(struct media_pad *pad)
{
unsigned int i;
if (!(pad->flags & MEDIA_PAD_FL_SINK))
return NULL;
for (i = 0; i < pad->entity->num_links; ++i) {
struct media_link *link = &pad->entity->links[i];
if (!(link->flags & MEDIA_LNK_FL_ENABLED))
continue;
if (link->sink == pad)
return link->source;
}
return NULL;
}
/**
* @brief Find an entity by its name.
* @param media - media device.
* @param name - entity name.
* @param length - size of @a name.
*
* Search for an entity with a name equal to @a name.
*
* @return A pointer to the entity if found, or NULL otherwise.
*/
struct media_entity *exynos_media_get_entity_by_name(struct media_device *media,
const char *name, size_t length)
{
unsigned int i;
struct media_entity *entity;
for (i = 0; i < media->entities_count; ++i) {
entity = &media->entities[i];
if (strncmp(entity->info.name, name, length) == 0)
return entity;
}
return NULL;
}
/**
* @brief Find an entity by its ID.
* @param media - media device.
* @param id - entity ID.
*
* Search for an entity with an ID equal to @a id.
*
* @return A pointer to the entity if found, or NULL otherwise.
*/
struct media_entity *exynos_media_get_entity_by_id(struct media_device *media,
__u32 id)
{
unsigned int i;
for (i = 0; i < media->entities_count; ++i) {
struct media_entity *entity = &media->entities[i];
if (entity->info.id == id)
return entity;
}
return NULL;
}
/**
* @brief Configure a link.
* @param media - media device.
* @param source - source pad at the link origin.
* @param sink - sink pad at the link target.
* @param flags - configuration flags.
*
* Locate the link between @a source and @a sink, and configure it by applying
* the new @a flags.
*
* Only the MEDIA_LINK_FLAG_ENABLED flag is writable.
*
* @return 0 on success, -1 on failure:
* -ENOENT: link not found
* - other error codes returned by MEDIA_IOC_SETUP_LINK
*/
int exynos_media_setup_link(struct media_device *media,
struct media_pad *source,
struct media_pad *sink,
__u32 flags)
{
struct media_link *link;
struct media_link_desc ulink;
unsigned int i;
int ret;
for (i = 0; i < source->entity->num_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->num_links) {
ALOGE("Link not found");
return -ENOENT;
}
/* source pad */
ulink.source.entity = source->entity->info.id;
ulink.source.index = source->index;
ulink.source.flags = MEDIA_PAD_FL_SOURCE;
/* sink pad */
ulink.sink.entity = sink->entity->info.id;
ulink.sink.index = sink->index;
ulink.sink.flags = MEDIA_PAD_FL_SINK;
ulink.flags = flags | (link->flags & MEDIA_LNK_FL_IMMUTABLE);
ret = ioctl(media->fd, MEDIA_IOC_SETUP_LINK, &ulink);
if (ret == -1) {
ALOGE("Unable to setup link (%s)", strerror(errno));
return -errno;
}
link->flags = ulink.flags;
link->twin->flags = ulink.flags;
return 0;
}
/**
* @brief Reset all links to the disabled state.
* @param media - media device.
*
* Disable all links in the media device. This function is usually used after
* opening a media device to reset all links to a known state.
*
* @return 0 on success, or a negative error code on failure.
*/
int exynos_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->num_links; j++) {
struct media_link *link = &entity->links[j];
if (link->flags & MEDIA_LNK_FL_IMMUTABLE ||
link->source->entity != entity)
continue;
ret = exynos_media_setup_link(media, link->source, link->sink,
link->flags & ~MEDIA_LNK_FL_ENABLED);
if (ret < 0)
return ret;
}
}
return 0;
}
#ifdef HAVE_LIBUDEV
#include <libudev.h>
static inline int __media_udev_open(struct udev **udev)
{
*udev = udev_new();
if (*udev == NULL)
return -ENOMEM;
return 0;
}
static inline void __media_udev_close(struct udev *udev)
{
if (udev != NULL)
udev_unref(udev);
}
static int __media_get_devname_udev(struct udev *udev,
struct media_entity *entity)
{
struct udev_device *device;
dev_t devnum;
const char *p;
int ret = -ENODEV;
if (udev == NULL)
return -EINVAL;
devnum = makedev(entity->info.v4l.major, entity->info.v4l.minor);
ALOGE("looking up device: %u:%u",
major(devnum), minor(devnum));
device = udev_device_new_from_devnum(udev, 'c', devnum);
if (device) {
p = udev_device_get_devnode(device);
if (p) {
strncpy(entity->devname, p, sizeof(entity->devname));
entity->devname[sizeof(entity->devname) - 1] = '\0';
}
ret = 0;
}
udev_device_unref(device);
return ret;
}
#else /* HAVE_LIBUDEV */
struct udev;
static inline int __media_udev_open(struct udev **udev) { return 0; }
static inline void __media_udev_close(struct udev *udev) { }
static inline int __media_get_devname_udev(struct udev *udev,
struct media_entity *entity)
{
return -ENOTSUP;
}
#endif /* HAVE_LIBUDEV */
/**
* @brief Parse string to a pad on the media device.
* @param media - media device.
* @param p - input string
* @param endp - pointer to string where parsing ended
*
* Parse NULL terminated string describing a pad and return its struct
* media_pad instance.
*
* @return Pointer to struct media_pad on success, NULL on failure.
*/
struct media_pad *exynos_media_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 = exynos_media_get_entity_by_name(media, p + 1, end - p - 1);
if (entity == NULL)
return NULL;
++end;
} else {
entity_id = strtoul(p, &end, 10);
entity = exynos_media_get_entity_by_id(media, entity_id);
if (entity == NULL)
return NULL;
}
for (; isspace(*end); ++end);
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);
if (endp)
*endp = (char *)p;
return &entity->pads[pad];
}
/**
* @brief Parse string to a link on the media device.
* @param media - media device.
* @param p - input string
* @param endp - pointer to p where parsing ended
*
* Parse NULL terminated string p describing a link and return its struct
* media_link instance.
*
* @return Pointer to struct media_link on success, NULL on failure.
*/
struct media_link *exynos_media_parse_link(
struct media_device *media,
const char *p,
char **endp)
{
struct media_link *link;
struct media_pad *source;
struct media_pad *sink;
unsigned int i;
char *end;
source = exynos_media_parse_pad(media, p, &end);
if (source == NULL)
return NULL;
if (end[0] != '-' || end[1] != '>')
return NULL;
p = end + 2;
sink = exynos_media_parse_pad(media, p, &end);
if (sink == NULL)
return NULL;
*endp = end;
for (i = 0; i < source->entity->num_links; i++) {
link = &source->entity->links[i];
if (link->source == source && link->sink == sink)
return link;
}
return NULL;
}
/**
* @brief Parse string to a link on the media device and set it up.
* @param media - media device.
* @param p - input string
*
* Parse NULL terminated string p describing a link and its configuration
* and configure the link.
*
* @return 0 on success, or a negative error code on failure.
*/
int exynos_media_parse_setup_link(
struct media_device *media,
const char *p,
char **endp)
{
struct media_link *link;
__u32 flags;
char *end;
link = exynos_media_parse_link(media, p, &end);
if (link == NULL) {
ALOGE("Unable to parse link");
return -EINVAL;
}
p = end;
if (*p++ != '[') {
ALOGE("Unable to parse link flags");
return -EINVAL;
}
flags = strtoul(p, &end, 10);
for (p = end; isspace(*p); p++);
if (*p++ != ']') {
ALOGE("Unable to parse link flags");
return -EINVAL;
}
for (; isspace(*p); p++);
*endp = (char *)p;
ALOGD("%s: Setting up link %u:%u -> %u:%u [%u]", __func__,
link->source->entity->info.id, link->source->index,
link->sink->entity->info.id, link->sink->index,
flags);
return exynos_media_setup_link(media, link->source, link->sink, flags);
}
/**
* @brief Parse string to link(s) on the media device and set it up.
* @param media - media device.
* @param p - input string
*
* Parse NULL terminated string p describing link(s) separated by
* commas (,) and configure the link(s).
*
* @return 0 on success, or a negative error code on failure.
*/
int exynos_media_parse_setup_links(struct media_device *media, const char *p)
{
char *end;
int ret;
do {
ret = exynos_media_parse_setup_link(media, p, &end);
if (ret < 0)
return ret;
p = end + 1;
} while (*end == ',');
return *end ? -EINVAL : 0;
}