From a93ac6aec7f059b41c67513604ac0a6aabf9f008 Mon Sep 17 00:00:00 2001
From: Vito Caputo <vcaputo@gnugeneration.com>
Date: Tue, 13 Dec 2016 07:27:36 -0800
Subject: drmsetup: introduce drm_setup()

quick and dirty stdio-based drm card and connector selection
---
 drmsetup.c | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 drmsetup.h |  10 +++++
 2 files changed, 157 insertions(+)
 create mode 100644 drmsetup.c
 create mode 100644 drmsetup.h

diff --git a/drmsetup.c b/drmsetup.c
new file mode 100644
index 0000000..3ed435a
--- /dev/null
+++ b/drmsetup.c
@@ -0,0 +1,147 @@
+/*
+ * Rudimentary drm setup dialog... this is currently a very basic stdio thingy.
+ */
+
+#include <assert.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+#include "util.h"
+
+static const char * encoder_type_name(uint32_t type) {
+	static const char *encoder_types[] = {
+		"None",
+		"DAC",
+		"TMDS",
+		"LVDAC",
+		"VIRTUAL",
+		"DSI"
+	};
+
+	assert(type < nelems(encoder_types));
+
+	return encoder_types[type];
+}
+
+
+static const char * connector_type_name(uint32_t type) {
+	static const char *connector_types[] = {
+		"Unknown",
+		"VGA",
+		"DVII",
+		"DVID",
+		"DVIA",
+		"Composite",
+		"SVIDEO",
+		"LVDS",
+		"Component",
+		"SPinDIN",
+		"DisplayPort",
+		"HDMIA",
+		"HDMIB",
+		"TV",
+		"eDP",
+		"VIRTUAL",
+		"DSI"
+	};
+
+	assert(type < nelems(connector_types));
+
+	return connector_types[type];
+}
+
+
+static const char * connection_type_name(int type) {
+	static const char *connection_types[] = {
+		[1] = "Connected",
+		"Disconnected",
+		"Unknown"
+	};
+
+	assert(type < nelems(connection_types));
+
+	return connection_types[type];
+}
+
+
+/* interactively setup the drm device, store the selections */
+void drm_setup(int *res_drm_fd, uint32_t *res_crtc_id, uint32_t *res_connector_id, drmModeModeInfoPtr *res_mode)
+{
+	int			drm_fd, i;
+	drmVersionPtr		drm_ver;
+	drmModeResPtr		drm_res;
+	drmModeConnectorPtr	drm_con;
+	drmModeEncoderPtr	drm_enc;
+	drmModeCrtcPtr		drm_crtc;
+	char			dev[256];
+	int			connector_num;
+
+	pexit_if(!drmAvailable(),
+		"drm unavailable");
+
+	ask_string(dev, sizeof(dev), "DRM device", "/dev/dri/card0");
+
+	pexit_if((drm_fd = open(dev, O_RDWR)) < 0,
+		"unable to open drm device \"%s\"", dev);
+
+	pexit_if(!(drm_ver = drmGetVersion(drm_fd)),
+		"unable to get drm version");
+
+	printf("\nVersion: %i.%i.%i\nName: \"%.*s\"\nDate: \"%.*s\"\nDescription: \"%.*s\"\n\n",
+		drm_ver->version_major,
+		drm_ver->version_minor,
+		drm_ver->version_patchlevel,
+		drm_ver->name_len,
+		drm_ver->name,
+		drm_ver->date_len,
+		drm_ver->date,
+		drm_ver->desc_len,
+		drm_ver->desc);
+
+	exit_if(!(drm_res = drmModeGetResources(drm_fd)),
+		"unable to get drm resources");
+
+	for (i = 0; i < drm_res->count_connectors; i++) {
+
+		exit_if(!(drm_con = drmModeGetConnector(drm_fd, drm_res->connectors[i])),
+			"unable to get connector %x", (int)drm_res->connectors[i]);
+
+		if (!drm_con->encoder_id) {
+			continue;
+		}
+
+		exit_if(!(drm_enc = drmModeGetEncoder(drm_fd, drm_con->encoder_id)),
+			"unable to get encoder %x", (int)drm_con->encoder_id);
+
+		printf("%i: Connector [%x]: %s [%s%s%s]\n",
+			i, (int)drm_res->connectors[i],
+			connector_type_name(drm_con->connector_type),
+			connection_type_name(drm_con->connection),
+			drm_con->encoder_id ? " via " : "",
+			drm_con->encoder_id ? encoder_type_name(drm_enc->encoder_type) : "");
+			/* TODO show mmWidth/mmHeight? */
+	}
+	ask_num(&connector_num, drm_res->count_connectors, "Connector", 0); // TODO default? 
+
+	exit_if(!(drm_con = drmModeGetConnector(drm_fd, drm_res->connectors[connector_num])),
+		"unable to get connector %x", (int)drm_res->connectors[connector_num]);
+	exit_if(!(drm_enc = drmModeGetEncoder(drm_fd, drm_con->encoder_id)),
+		"unable to get encoder %x", (int)drm_con->encoder_id);
+
+	exit_if(!(drm_crtc = drmModeGetCrtc(drm_fd, drm_enc->crtc_id)),
+		"unable to get crtc %x", (int)drm_enc->crtc_id);
+
+	*res_drm_fd = drm_fd;
+	*res_crtc_id = drm_crtc->crtc_id;
+	*res_connector_id = drm_con->connector_id;
+	*res_mode = &drm_crtc->mode;
+}
diff --git a/drmsetup.h b/drmsetup.h
new file mode 100644
index 0000000..61af2d5
--- /dev/null
+++ b/drmsetup.h
@@ -0,0 +1,10 @@
+#ifndef _DRM_SETUP_H
+#define _DRM_SETUP_H
+
+#include <stddef.h>	/* xf86drmMode.h uses size_t without including stddef.h, sigh */
+#include <stdint.h>
+#include <xf86drmMode.h>
+
+void drm_setup(int *res_drm_fd, uint32_t *res_crtc_id, uint32_t *res_connector_id, drmModeModeInfoPtr *res_mode);
+
+#endif
-- 
cgit v1.2.1