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backend/drm: add support for the subconnector property

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The subconnector property indicates the connector sub-type. This is
useful because that usually indicates what kind of connector the user
has plugged in to their monitor, e.g. a DisplayPort-to-DVI cable will
indicate a DVI subconnector. Also some laptops have non-DP connectors
that are internally linked to a DP port on the GPU.

Set the output description accordingly.

See https://drmdb.emersion.fr/properties/3233857728/subconnector
This commit is contained in:
Simon Ser 2021-01-13 00:33:19 +01:00
parent 6af748171a
commit cb6f584496
3 changed files with 43 additions and 2 deletions
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26
backend/drm/properties.c
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@ -1,3 +1,4 @@
#define _POSIX_C_SOURCE 200809L
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
@ -24,6 +25,7 @@ static const struct prop_info connector_info[] = {
{ "EDID", INDEX(edid) },
{ "PATH", INDEX(path) },
{ "link-status", INDEX(link_status) },
{ "subconnector", INDEX(subconnector) },
{ "vrr_capable", INDEX(vrr_capable) },
#undef INDEX
};
@ -151,3 +153,27 @@ void *get_drm_prop_blob(int fd, uint32_t obj, uint32_t prop, size_t *ret_len) {
drmModeFreePropertyBlob(blob);
return ptr;
}
char *get_drm_prop_enum(int fd, uint32_t obj, uint32_t prop_id) {
uint64_t value;
if (!get_drm_prop(fd, obj, prop_id, &value)) {
return NULL;
}
drmModePropertyRes *prop = drmModeGetProperty(fd, prop_id);
if (!prop) {
return NULL;
}
char *str = NULL;
for (int i = 0; i < prop->count_enums; i++) {
if (prop->enums[i].value == value) {
str = strdup(prop->enums[i].name);
break;
}
}
drmModeFreeProperty(prop);
return str;
}