From 82b200e00c2c7dbeae108b21b2bba39305300d4a Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Fri, 11 Jan 2019 12:09:40 +0200
Subject: card: add open_modesetting_card()

Add open_modesetting_card() which iterates the DRM cards and returns the
first one that has crtcs and connectors.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
 kms++/src/card.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'kms++/src')

diff --git a/kms++/src/card.cpp b/kms++/src/card.cpp
index 4632f22..04750af 100644
--- a/kms++/src/card.cpp
+++ b/kms++/src/card.cpp
@@ -7,6 +7,7 @@
 #include <algorithm>
 #include <cerrno>
 #include <algorithm>
+#include <sys/stat.h>
 
 #include <xf86drm.h>
 #include <xf86drmMode.h>
@@ -18,6 +19,25 @@ using namespace std;
 namespace kms
 {
 
+unique_ptr<Card> Card::open_modesetting_card()
+{
+	for (uint32_t i = 0; ; ++i) {
+		string path = "/dev/dri/card" + to_string(i);
+
+		struct stat buffer;
+		if (stat(path.c_str(), &buffer))
+			break;
+
+		unique_ptr<Card> card = unique_ptr<Card>(new Card(path));
+
+		if (card->get_connectors().size() > 0 &&
+		    card->get_crtcs().size() > 0)
+			return card;
+	}
+
+	throw runtime_error("No modesetting DRM card found");
+}
+
 static int open_device_by_path(string path)
 {
 	int fd = open(path.c_str(), O_RDWR | O_CLOEXEC);
-- 
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