diff --git a/src/video/kmsdrm/SDL_kmsdrmvideo.c b/src/video/kmsdrm/SDL_kmsdrmvideo.c index 973a72602..bacbe0c1e 100644 --- a/src/video/kmsdrm/SDL_kmsdrmvideo.c +++ b/src/video/kmsdrm/SDL_kmsdrmvideo.c @@ -41,20 +41,27 @@ #include "SDL_kmsdrmopengles.h" #include "SDL_kmsdrmmouse.h" #include "SDL_kmsdrmdyn.h" +#include +#include +#include -#define KMSDRM_DRI_CARD_0 "/dev/dri/card0" +#define KMSDRM_DRI_PATH "/dev/dri/" static int -KMSDRM_Available(void) +check_modestting(int devindex) { - int available = 0; + SDL_bool available = SDL_FALSE; + char device[512]; + int drm_fd; - int drm_fd = open(KMSDRM_DRI_CARD_0, O_RDWR | O_CLOEXEC); + SDL_snprintf(device, sizeof (device), "%scard%d", KMSDRM_DRI_PATH, devindex); + + drm_fd = open(device, O_RDWR | O_CLOEXEC); if (drm_fd >= 0) { if (SDL_KMSDRM_LoadSymbols()) { drmModeRes *resources = KMSDRM_drmModeGetResources(drm_fd); if (resources != NULL) { - available = 1; + available = SDL_TRUE; KMSDRM_drmModeFreeResources(resources); } SDL_KMSDRM_UnloadSymbols(); @@ -65,6 +72,66 @@ KMSDRM_Available(void) return available; } +static int get_dricount(void) +{ + int devcount = 0; + struct dirent *res; + struct stat sb; + DIR *folder; + + if (!(stat(KMSDRM_DRI_PATH, &sb) == 0 + && S_ISDIR(sb.st_mode))) { + printf("The path %s cannot be opened or is not available\n", + KMSDRM_DRI_PATH); + return 0; + } + + if (access(KMSDRM_DRI_PATH, F_OK) == -1) { + printf("The path %s cannot be opened\n", + KMSDRM_DRI_PATH); + return 0; + } + + folder = opendir(KMSDRM_DRI_PATH); + if (folder) { + while ((res = readdir(folder))) { + if (res->d_type == DT_CHR) { + devcount++; + } + } + closedir(folder); + } + + return devcount; +} + +static int +get_driindex(void) +{ + const int devcount = get_dricount(); + int i; + + for (i = 0; i < devcount; i++) { + if (check_modestting(i)) { + return i; + } + } + + return -ENOENT; +} + +static int +KMSDRM_Available(void) +{ + int ret = -ENOENT; + + ret = get_driindex(); + if (ret >= 0) + return 1; + + return ret; +} + static void KMSDRM_Destroy(SDL_VideoDevice * device) { @@ -83,7 +150,11 @@ KMSDRM_Create(int devindex) SDL_VideoDevice *device; SDL_VideoData *vdata; - if (devindex < 0 || devindex > 99) { + if (!devindex || (devindex > 99)) { + devindex = get_driindex(); + } + + if (devindex < 0) { SDL_SetError("devindex (%d) must be between 0 and 99.\n", devindex); return NULL; }