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-rw-r--r--src/lib/gamma-linux-drm.c65
1 files changed, 50 insertions, 15 deletions
diff --git a/src/lib/gamma-linux-drm.c b/src/lib/gamma-linux-drm.c
index dba98b1..f6a4776 100644
--- a/src/lib/gamma-linux-drm.c
+++ b/src/lib/gamma-linux-drm.c
@@ -378,7 +378,6 @@ int libgamma_linux_drm_crtc_initialise(libgamma_crtc_state_t* restrict this,
libgamma_partition_state_t* restrict partition, size_t crtc)
{
libgamma_drm_card_data_t* restrict card = partition->data;
- uint32_t crtc_id;
if (crtc >= partition->crtcs_available)
return LIBGAMMA_NO_SUCH_CRTC;
@@ -469,13 +468,18 @@ static int get_gamma_ramp_size(libgamma_crtc_information_t* restrict out, const
libgamma_drm_card_data_t* restrict card = crtc->partition->data;
uint32_t crtc_id = card->res->crtcs[crtc->crtc];
drmModeCrtc* restrict crtc_info;
+ /* Get CRTC information. */
errno = 0;
crtc_info = drmModeGetCrtc(card->fd, crtc_id);
out->gamma_size_error = crtc_info == NULL ? errno : 0;
+ /* Get gamma ramp size. */
if (out->gamma_size_error == 0)
{
+ /* Store gamma ramp size. */
out->red_gamma_size = out->green_gamma_size = out->blue_gamma_size = (size_t)(crtc_info->gamma_size);
+ /* Sanity check gamma ramp size. */
out->gamma_size_error = crtc_info->gamma_size < 2 ? LIBGAMMA_SINGLETON_GAMMA_RAMP : 0;
+ /* Release CRTC information. */
drmModeFreeCrtc(crtc_info);
}
return out->gamma_size_error;
@@ -530,14 +534,20 @@ static void get_connector_type(libgamma_crtc_information_t* restrict out,
*connector_name_base = name; \
break
- switch (connector->connector_type)
- {
+ /* These may not have been included by <xf86drmMode.h>,
+ but they should be available. Becuase we define them
+ outself, it is best to test them last. */
#ifndef DRM_MODE_CONNECTOR_VIRTUAL
# define DRM_MODE_CONNECTOR_VIRTUAL 15
#endif
#ifndef DRM_MODE_CONNECTOR_DSI
# define DRM_MODE_CONNECTOR_DSI 16
#endif
+
+ /* Translate connector type from DRM to libgamma
+ and store connector basename. */
+ switch (connector->connector_type)
+ {
__select (Unknown, "Unknown" );
__select (VGA, "VGA" );
__select (DVII, "DVI-I" );
@@ -612,13 +622,17 @@ static int read_connector_data(libgamma_crtc_state_t* restrict crtc, libgamma_cr
uint32_t type = connector->connector_type;
size_t i, n = (size_t)(card->res->count_connectors), c = 0;
+ /* Allocate memory for the name of the connector. */
out->connector_name = malloc((strlen(connector_name_base) + 12) * sizeof(char));
if (out->connector_name == NULL)
- return (out->connector_name_error = errno);
+ return out->connector_name_error = errno;
+ /* Get the number of connectors with the same type on the same graphics card. */
for (i = 0; (i < n) && (card->connectors[i] != connector); i++)
if (card->connectors[i]->connector_type == type)
c++;
+
+ /* Construct and store connect name that is unique to the graphics card. */
sprintf(out->connector_name, "%s-" PRIu32, connector_name_base, (uint32_t)(c + 1));
}
@@ -644,34 +658,41 @@ static int get_edid(libgamma_crtc_state_t* restrict crtc,
drmModePropertyRes* restrict prop;
drmModePropertyBlobRes* restrict blob;
+ /* Test all properies on the connector. */
for (prop_i = 0; prop_i < prop_n; prop_i++)
{
- prop = drmModeGetProperty(card->fd, connector->props[prop_i]);
- if (prop == NULL)
+ /* Get output property, */
+ if ((prop = drmModeGetProperty(card->fd, connector->props[prop_i])) == NULL)
continue;
- if (!strcmp("EDID", prop->name))
+ /* Is this property the EDID? */
+ if (!strcmp(prop->name, "EDID"))
{
- blob = drmModeGetPropertyBlob(card->fd, (uint32_t)(connector->prop_values[prop_i]));
- if (blob == NULL)
- {
- drmModeFreeProperty(prop);
- return out->edid_error = LIBGAMMA_PROPERTY_VALUE_QUERY_FAILED;
- }
+ /* Get the property value. */
+ if ((blob = drmModeGetPropertyBlob(card->fd, (uint32_t)(connector->prop_values[prop_i]))) == NULL)
+ return drmModeFreeProperty(prop), out->edid_error = LIBGAMMA_PROPERTY_VALUE_QUERY_FAILED;
if (blob->data != NULL)
{
+ /* Get and store the length of the EDID. */
out->edid_length = blob->length;
- out->edid = malloc(out->edid_length * sizeof(unsigned char));
- if (out->edid == NULL)
+ /* Allocate memory for a copy of the EDID that is under our memory control. */
+ if ((out->edid = malloc(out->edid_length * sizeof(unsigned char))) == NULL)
out->edid_error = errno;
else
+ /* Copy the EDID so we can free resources that got us here. */
memcpy(out->edid, blob->data, (size_t)(out->edid_length) * sizeof(char));
+ /* Free the propriety value and the propery. */
drmModeFreePropertyBlob(blob);
+ drmModeFreeProperty(prop);
+ /* Were we successful? */
return out->edid == NULL;
}
+ /* Free the propriety value. */
drmModeFreePropertyBlob(blob);
}
+ /* Free the propriety. */
drmModeFreeProperty(prop);
}
+ /* If we get here, we did not find a EDID. */
return out->edid_error = LIBGAMMA_EDID_NOT_FOUND;
}
@@ -704,10 +725,13 @@ int libgamma_linux_drm_get_crtc_information(libgamma_crtc_information_t* restric
/* Figure out whether we require the connector to get all information we want. */
require_connector = fields & (LIBGAMMA_CRTC_INFO_MACRO_ACTIVE | LIBGAMMA_CRTC_INFO_MACRO_CONNECTOR);
+ /* If we are not interested in the connector or monitor, jump. */
if (require_connector == 0)
goto cont;
+ /* Find connector. */
if ((connector = find_connector(crtc, &error)) == NULL)
{
+ /* Store reported error in affected fields. */
e |= this->width_mm_error = this->height_mm_error
= this->connector_type = this->subpixel_order_error
= this->active_error = this->connector_name_error
@@ -715,9 +739,14 @@ int libgamma_linux_drm_get_crtc_information(libgamma_crtc_information_t* restric
= this->width_mm_edid_error = this->height_mm_edid_error = error;
goto cont;
}
+
+ /* Read connector data and monitor data, excluding EDID.. */
e |= read_connector_data(crtc, this, connector, fields);
+
+ /* If we do not want any EDID information, jump. */
if ((fields & LIBGAMMA_CRTC_INFO_MACRO_EDID) == 0)
goto cont;
+ /* If there is not monitor that report error in EDID related fields. */
if (this->active_error || (this->active == 0))
{
e |= this->edid_error = this->gamma_error
@@ -725,17 +754,23 @@ int libgamma_linux_drm_get_crtc_information(libgamma_crtc_information_t* restric
= LIBGAMMA_NOT_CONNECTED;
goto cont;
}
+ /* Get EDID. */
e |= get_edid(crtc, this, connector);
if (this->edid == NULL)
{
this->gamma_error = this->width_mm_edid_error = this->height_mm_edid_error = this->edid_error;
goto cont;
}
+ /* Parse EDID. */
if ((fields & (LIBGAMMA_CRTC_INFO_MACRO_EDID ^ LIBGAMMA_CRTC_INFO_EDID)))
e |= libgamma_parse_edid(this, fields);
+
cont:
+ /* Get gamma ramp size. */
e |= (fields & LIBGAMMA_CRTC_INFO_GAMMA_SIZE) ? get_gamma_ramp_size(this, crtc) : 0;
+ /* Store gamma ramp depth. */
this->gamma_depth = 16;
+ /* X RandR does not support quering gamma ramp support. */
e |= this->gamma_support_error = _E(LIBGAMMA_CRTC_INFO_GAMMA_SUPPORT);
/* Free the EDID after us. */
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-27 10:41:51 +0000