[PATCH v2 3/3] modetest: Add a command line parameter to select the driver

[Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>]

If the -M parameter is specific, modetest will use the requested device
name instead of trying its builtin list of device names.

Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
 tests/modetest/modetest.c | 41 ++++++++++++++++++++++++++++-------------
 1 file changed, 28 insertions(+), 13 deletions(-)

diff --git a/tests/modetest/modetest.c b/tests/modetest/modetest.c
index 34457e2..9a2d1f8 100644
--- a/tests/modetest/modetest.c
+++ b/tests/modetest/modetest.c
@@ -908,6 +908,9 @@ void usage(char *name)
 	fprintf(stderr, "\t-s <connector_id>[@<crtc_id>]:<mode>[@<format>]\tset a mode\n");
 	fprintf(stderr, "\t-v\ttest vsynced page flipping\n");
 
+	fprintf(stderr, "\n Generic options:\n\n");
+	fprintf(stderr, "\t-M module\tuse the given driver\n");
+
 	fprintf(stderr, "\n\tDefault is to dump all info.\n");
 	exit(0);
 }
@@ -935,7 +938,7 @@ static int page_flipping_supported(void)
 #endif
 }
 
-static char optstr[] = "cefmP:ps:v";
+static char optstr[] = "cefM:mP:ps:v";
 
 int main(int argc, char **argv)
 {
@@ -943,6 +946,7 @@ int main(int argc, char **argv)
 	int encoders = 0, connectors = 0, crtcs = 0, planes = 0, framebuffers = 0;
 	int test_vsync = 0;
 	char *modules[] = { "i915", "radeon", "nouveau", "vmwgfx", "omapdrm", "exynos" };
+	char *module = NULL;
 	unsigned int i;
 	int count = 0, plane_count = 0;
 	struct connector con_args[2];
@@ -960,6 +964,9 @@ int main(int argc, char **argv)
 		case 'f':
 			framebuffers = 1;
 			break;
+		case 'M':
+			module = optarg;
+			break;
 		case 'm':
 			modes = 1;
 			break;
@@ -989,14 +996,27 @@ int main(int argc, char **argv)
 	if (argc == 1)
 		encoders = connectors = crtcs = planes = modes = framebuffers = 1;
 
-	for (i = 0; i < ARRAY_SIZE(modules); i++) {
-		printf("trying to load module %s...", modules[i]);
-		fd = drmOpen(modules[i], NULL);
+	if (module) {
+		fd = drmOpen(module, NULL);
 		if (fd < 0) {
-			printf("failed.\n");
-		} else {
-			printf("success.\n");
-			break;
+			fprintf(stderr, "failed to open device '%s'.\n", module);
+			return 1;
+		}
+	} else {
+		for (i = 0; i < ARRAY_SIZE(modules); i++) {
+			printf("trying to open device '%s'...", modules[i]);
+			fd = drmOpen(modules[i], NULL);
+			if (fd < 0) {
+				printf("failed.\n");
+			} else {
+				printf("success.\n");
+				break;
+			}
+		}
+
+		if (fd < 0) {
+			fprintf(stderr, "no device found.\n", module);
+			return 1;
 		}
 	}
 
@@ -1005,11 +1025,6 @@ int main(int argc, char **argv)
 		return -1;
 	}
 
-	if (i == ARRAY_SIZE(modules)) {
-		fprintf(stderr, "failed to load any modules, aborting.\n");
-		return -1;
-	}
-
 	resources = drmModeGetResources(fd);
 	if (!resources) {
 		fprintf(stderr, "drmModeGetResources failed: %s\n",
-- 
1.7.12.4

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