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From 212c7c68ec228a1058f39497d18c65e9312d00df Mon Sep 17 00:00:00 2001
From: Michael Grzeschik <m.grzeschik@pengutronix.de>
Date: Thu, 12 Jul 2018 13:48:54 +0200
Subject: [PATCH] sdl-2.0.8: KMSDRM: find available card if called without
index
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
---
src/video/kmsdrm/SDL_kmsdrmvideo.c | 84 ++++++++++++++++++++++++++++--
1 file changed, 80 insertions(+), 4 deletions(-)
diff --git a/src/video/kmsdrm/SDL_kmsdrmvideo.c b/src/video/kmsdrm/SDL_kmsdrmvideo.c
index 7855eeddb..f63c91b0a 100644
--- a/src/video/kmsdrm/SDL_kmsdrmvideo.c
+++ b/src/video/kmsdrm/SDL_kmsdrmvideo.c
@@ -41,15 +41,22 @@
#include "SDL_kmsdrmopengles.h"
#include "SDL_kmsdrmmouse.h"
#include "SDL_kmsdrmdyn.h"
+#include <sys/stat.h>
+#include <dirent.h>
+#include <errno.h>
-#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;
+ char device[512];
+ int drm_fd;
+
+ sprintf(device, "%scard%d", KMSDRM_DRI_PATH, devindex);
- int drm_fd = open(KMSDRM_DRI_CARD_0, O_RDWR | O_CLOEXEC);
+ drm_fd = open(device, O_RDWR | O_CLOEXEC);
if (drm_fd >= 0) {
if (SDL_KMSDRM_LoadSymbols()) {
drmModeRes *resources = KMSDRM_drmModeGetResources(drm_fd);
@@ -65,6 +72,72 @@ 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)
+ return 0;
+
+ while ((res = readdir(folder))) {
+ if (res->d_type == DT_CHR)
+ devcount++;
+ }
+
+ closedir(folder);
+
+ return devcount;
+}
+
+static int
+get_driindex(void)
+{
+ int i = 0;
+ int available = 0;
+ int devcount = get_dricount();
+
+ for (i = 0; i < devcount; i++) {
+ if (check_modestting(i)) {
+ available = 1;
+ break;
+ }
+ }
+
+ if (available)
+ 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 +156,10 @@ 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;
}
--
2.18.0
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