Used to access device controls
Signed-off-by: Andrey Grodzovsky andrey.grodzovsky@amd.com --- xf86drm.c | 23 +++++++++++++++++++++++ xf86drm.h | 1 + 2 files changed, 24 insertions(+)
diff --git a/xf86drm.c b/xf86drm.c index edfeb347..a5ecd323 100644 --- a/xf86drm.c +++ b/xf86drm.c @@ -4361,6 +4361,29 @@ drm_public char *drmGetDeviceNameFromFd2(int fd) #endif }
+drm_public char *drmGetCharDeviceFromFd(int fd) +{ +#ifdef __linux__ + struct stat sbuf; + char path[PATH_MAX + 1]; + unsigned int maj, min; + + if (fstat(fd, &sbuf)) + return NULL; + + maj = major(sbuf.st_rdev); + min = minor(sbuf.st_rdev); + + if (!drmNodeIsDRM(maj, min) || !S_ISCHR(sbuf.st_mode)) + return NULL; + + snprintf(path, sizeof(path), "/sys/dev/char/%d:%d", maj, min); + return strdup(path); +#else + return NULL; +#endif +} + drm_public int drmSyncobjCreate(int fd, uint32_t flags, uint32_t *handle) { struct drm_syncobj_create args; diff --git a/xf86drm.h b/xf86drm.h index 9fc06ab8..c172dbc1 100644 --- a/xf86drm.h +++ b/xf86drm.h @@ -812,6 +812,7 @@ extern char *drmGetDeviceNameFromFd(int fd); */ extern char *drmGetDeviceNameFromFd2(int fd); extern int drmGetNodeTypeFromFd(int fd); +extern char *drmGetCharDeviceFromFd(int fd);
/* Convert between GEM handles and DMA-BUF file descriptors. *