From 303669359ff09004d491136d94b4e525c4792a18 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@operamail.com>
Date: Wed, 6 Aug 2014 22:41:04 +0200
Subject: work on drm utilisation
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Signed-off-by: Mattias Andrée <maandree@operamail.com>
---
src/drmgamma.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
src/drmgamma.h | 69 ++++++++++++++++++++++++++++++
2 files changed, 198 insertions(+), 2 deletions(-)
(limited to 'src')
diff --git a/src/drmgamma.c b/src/drmgamma.c
index 0a8f72f..16a3006 100644
--- a/src/drmgamma.c
+++ b/src/drmgamma.c
@@ -21,6 +21,8 @@
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
@@ -56,7 +58,6 @@ size_t drm_card_count(void)
if (access(buf, F_OK) < 0)
return count;
}
-
}
/**
@@ -70,9 +71,13 @@ int drm_card_open(size_t index, drm_card_t* restrict card)
{
char buf[DRM_DEV_NAME_MAX_LEN];
int old_errno;
+ size_t i, n;
card->fd = -1;
card->res = NULL;
+ card->connectors = NULL;
+ card->encoders = NULL;
+ card->connector_count = 0;
sprintf(buf, DRM_DEV_NAME, DRM_DIR_NAME, (int)index);
card->fd = open(buf, O_RDWR | O_CLOEXEC);
@@ -83,7 +88,30 @@ int drm_card_open(size_t index, drm_card_t* restrict card)
if (card->res == NULL)
goto fail;
- card->crtc_count = (size_t)(card->res->count_crtcs);
+ card->crtc_count = (size_t)(card->res->count_crtcs);
+ card->connector_count = (size_t)(card->res->count_connectors);
+ n = card->connector_count;
+
+ card->connectors = calloc(n, sizeof(drmModeConnector*));
+ if (card->connectors == NULL)
+ goto fail;
+ card->encoders = calloc(n, sizeof(drmModeEncoder*));
+ if (card->encoders == NULL)
+ goto fail;
+
+ for (i = 0; i < n; i++)
+ {
+ card->connectors[i] = drmModeGetConnector(card->fd, card->res->connectors[i]);
+ if (card->connectors[i] == NULL)
+ goto fail;
+
+ if (card->connectors[i]->encoder_id != 0)
+ {
+ card->encoders[i] = drmModeGetEncoder(card->fd, card->connectors[i]->encoder_id);
+ if (card->encoders[i] == NULL)
+ goto fail;
+ }
+ }
return 0;
fail:
@@ -101,8 +129,107 @@ int drm_card_open(size_t index, drm_card_t* restrict card)
*/
void drm_card_close(drm_card_t* restrict card)
{
+ size_t i, n = card->connector_count;
+
+ if (card->encoders != NULL)
+ for (i = 0; i < n; i++)
+ if (card->encoders[i] != NULL)
+ drmModeFreeEncoder(card->encoders[i]);
+ free(card->encoders), card->encoders = NULL;
+
+ if (card->connectors != NULL)
+ for (i = 0; i < n; i++)
+ if (card->connectors[i] != NULL)
+ drmModeFreeConnector(card->connectors[i]);
+ free(card->connectors), card->connectors = NULL;
+
if (card->res != NULL)
drmModeFreeResources(card->res), card->res = NULL;
if (card->fd != -1)
close(card->fd), card->fd = -1;
}
+
+
+/**
+ * Acquire access to a CRT controller
+ *
+ * @param index The index of the CRT controller
+ * @param card The graphics card information
+ * @param crtc CRT controller information to fill in
+ * @return Zero on success, -1 on error
+ */
+int drm_crtc_open(size_t index, drm_card_t* restrict card, drm_crtc_t* restrict crtc)
+{
+ drmModePropertyRes* restrict prop;
+ drmModePropertyBlobRes* restrict blob;
+ size_t i;
+
+ crtc->edid = NULL;
+
+ crtc->id = card->res->crtcs[index];
+ crtc->card = card;
+
+ for (i = 0; i < card->connector_count; i++)
+ if (card->encoders[i] != NULL)
+ if (card->encoders[i]->crtc_id == crtc->id)
+ {
+ crtc->connector = card->connectors[i];
+ crtc->encoder = card->encoders[i];
+ }
+
+ crtc->connected = crtc->connector->connection == DRM_MODE_CONNECTED;
+
+ for (i = 0; i < crtc->connector->count_props; i++)
+ {
+ size_t j;
+
+ prop = drmModeGetProperty(card->fd, crtc->connector->props[i]);
+ if (prop == NULL)
+ continue;
+
+ if (strcmp(prop->name, "EDID"))
+ goto free_prop;
+
+
+ blob = drmModeGetPropertyBlob(card->fd, (uint32_t)(crtc->connector->prop_values[i]));
+ i = crtc->connector->count_props;
+ if ((blob == NULL) || (blob->data == NULL))
+ goto free_blob;
+
+ crtc->edid = malloc((blob->length * 2 + 1) * sizeof(char));
+ if (crtc->edid == NULL)
+ {
+ drmModeFreePropertyBlob(blob);
+ drmModeFreeProperty(prop);
+ return -1;
+ }
+ for (j = 0; j < blob->length; j++)
+ {
+ unsigned char c = ((unsigned char*)(blob->data))[j];
+ crtc->edid[j * 2 + 0] = "0123456789ABCDEF"[(c >> 4) & 15];
+ crtc->edid[j * 2 + 1] = "0123456789ABCDEF"[(c >> 0) & 15];
+ }
+ crtc->edid[blob->length * 2] = '\0';
+
+ free_blob:
+ if (blob != NULL)
+ drmModeFreePropertyBlob(blob);
+
+ free_prop:
+ drmModeFreeProperty(prop);
+ }
+
+ return 0;
+}
+
+
+/**
+ * Release access to a CRT controller
+ *
+ * @param crtc The CRT controller information to fill in
+ */
+void drm_crtc_close(drm_crtc_t* restrict crtc)
+{
+ free(crtc->edid), crtc->edid = NULL;
+}
+
diff --git a/src/drmgamma.h b/src/drmgamma.h
index 7044fd7..efc7ec2 100644
--- a/src/drmgamma.h
+++ b/src/drmgamma.h
@@ -44,8 +44,60 @@ typedef struct drm_card
*/
size_t crtc_count;
+ /**
+ * The available connectors
+ */
+ drmModeConnector** restrict connectors;
+
+ /**
+ * The available encoders
+ */
+ drmModeEncoder** restrict encoders;
+
+ /**
+ * The number of connectors and encoders
+ */
+ size_t connector_count;
+
} drm_card_t;
+/**
+ * CRT controller information
+ */
+typedef struct drm_crtc
+{
+ /**
+ * CRT controller identifier
+ */
+ uint32_t id;
+
+ /**
+ * The graphics card
+ */
+ drm_card_t* restrict card;
+
+ /**
+ * The CRT controller's connector
+ */
+ drmModeConnector* restrict connector;
+
+ /**
+ * The CRT controller's encoder
+ */
+ drmModeEncoder* restrict encoder;
+
+ /**
+ * Whether the connector is connected
+ */
+ int connected;
+
+ /**
+ * The CRT's EDID, hexadecimally encoded
+ */
+ char* edid;
+
+} drm_crtc_t;
+
/**
* Figure out how many graphics cards there are on the system
@@ -70,6 +122,23 @@ int drm_card_open(size_t index, drm_card_t* restrict card);
*/
void drm_card_close(drm_card_t* restrict card);
+/**
+ * Acquire access to a CRT controller
+ *
+ * @param index The index of the CRT controller
+ * @param card The graphics card information
+ * @param crtc CRT controller information to fill in
+ * @return Zero on success, -1 on error
+ */
+int drm_crtc_open(size_t index, drm_card_t* restrict card, drm_crtc_t* restrict crtc);
+
+/**
+ * Release access to a CRT controller
+ *
+ * @param crtc The CRT controller information to fill in
+ */
+void drm_crtc_close(drm_crtc_t* restrict crtc);
+
#endif
--
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