diff --git a/xf86drm.c b/xf86drm.c index d85115ca..e117bc63 100644 --- a/xf86drm.c +++ b/xf86drm.c @@ -505,6 +505,23 @@ static int drmGetMinorBase(int type) }; } +static int drmGetMinorType(int minor) +{ + int type = minor >> 6; + + if (minor < 0) + return -1; + + switch (type) { + case DRM_NODE_PRIMARY: + case DRM_NODE_CONTROL: + case DRM_NODE_RENDER: + return type; + default: + return -1; + } +} + /** * Open the device by bus ID. * @@ -2667,6 +2684,28 @@ char *drmGetDeviceNameFromFd(int fd) return strdup(name); } +int drmGetNodeTypeFromFd(int fd) +{ + struct stat sbuf; + int maj, min, type; + + if (fstat(fd, &sbuf)) + return -1; + + maj = major(sbuf.st_rdev); + min = minor(sbuf.st_rdev); + + if (maj != DRM_MAJOR || !S_ISCHR(sbuf.st_mode)) { + errno = EINVAL; + return -1; + } + + type = drmGetMinorType(min); + if (type == -1) + errno = ENODEV; + return type; +} + int drmPrimeHandleToFD(int fd, uint32_t handle, uint32_t flags, int *prime_fd) { struct drm_prime_handle args; diff --git a/xf86drm.h b/xf86drm.h index 77937eb9..afd38a10 100644 --- a/xf86drm.h +++ b/xf86drm.h @@ -744,6 +744,7 @@ typedef struct _drmEventContext { extern int drmHandleEvent(int fd, drmEventContextPtr evctx); extern char *drmGetDeviceNameFromFd(int fd); +extern int drmGetNodeTypeFromFd(int fd); extern int drmPrimeHandleToFD(int fd, uint32_t handle, uint32_t flags, int *prime_fd); extern int drmPrimeFDToHandle(int fd, int prime_fd, uint32_t *handle);