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Commit 4188814c authored by Sachin Shah's avatar Sachin Shah Committed by Giulio Cervera
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init: uevent: Add msm video symbolic link handling 

Create meaningful symbolic links for video encode/decode
devices based on link_name sysfs node so that video client
doesn't have to rely on dynamic dev node names like device32,
device33 etc.

Change-Id: I70386351d83b8a7a7a690378870eee87f4c96983
parent 16738f9e

init/devices.c

+37 −0
Original line number Diff line number Diff line
@@ -358,6 +358,41 @@ static void parse_event(const char *msg, struct uevent *uevent) 
                    uevent->firmware, uevent->major, uevent->minor);

}



static char **get_v4l_device_symlinks(struct uevent *uevent)

{

    char **links;

    int fd = -1;

    int nr;

    char link_name_path[256];

    char link_name[64];



    if (strncmp(uevent->path, "/devices/virtual/video4linux/video", 34))

        return NULL;



    links = malloc(sizeof(char *) * 2);

    if (!links)

        return NULL;

    memset(links, 0, sizeof(char *) * 2);



    snprintf(link_name_path, sizeof(link_name_path), "%s%s%s",

            SYSFS_PREFIX, uevent->path, "/link_name");

    fd = open(link_name_path, O_RDONLY);

    if (fd < 0)

        goto err;

    nr = read(fd, link_name, sizeof(link_name) - 1);

    close(fd);

    if (nr <= 0)

        goto err;

    link_name[nr] = '\0';

    if (asprintf(&links[0], "/dev/video/%s", link_name) <= 0)

        links[0] = NULL;



    return links;

err:

    free(links);

    return NULL;

}



static char **get_character_device_symlinks(struct uevent *uevent)

{

    const char *parent;
@@ -628,6 +663,8 @@ static void handle_generic_device_event(struct uevent *uevent) 
     } else

         base = "/dev/";

     links = get_character_device_symlinks(uevent);

     if (!links)

         links = get_v4l_device_symlinks(uevent);



     if (!devpath[0])

         snprintf(devpath, sizeof(devpath), "%s%s", base, name);