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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <gbm.h>
/* ------------------------------------------------------------------ */
int drm_init_dev(const char *devname)
{
uint64_t prime, dumb;
int fd, rc;
/* open device */
fd = open(devname, O_RDWR);
if (fd < 0) {
fprintf(stderr, "open %s: %s\n", devname, strerror(errno));
exit(1);
}
rc = drmGetCap(fd, DRM_CAP_DUMB_BUFFER, &dumb);
if (rc < 0) {
fprintf(stderr, "drmGetCap(DRM_CAP_DUMB_BUFFER): %s\n", strerror(errno));
exit(1);
}
rc = drmGetCap(fd, DRM_CAP_PRIME, &prime);
if (rc < 0) {
fprintf(stderr, "drmGetCap(DRM_CAP_PRIME): %s\n", strerror(errno));
exit(1);
}
fprintf(stderr, "%s:\n", devname);
fprintf(stderr, " dumb buffers: %s\n",
dumb ? "yes" : "no");
fprintf(stderr, " prime import: %s\n",
prime & DRM_PRIME_CAP_IMPORT ? "yes" : "no");
fprintf(stderr, " prime export: %s\n",
prime & DRM_PRIME_CAP_EXPORT ? "yes" : "no");
return fd;
}
/* ------------------------------------------------------------------ */
static void usage(FILE *fp)
{
fprintf(fp,
"\n"
"usage: prime [ options ]\n"
"\n"
"options:\n"
" -h print this\n"
"\n");
}
int main(int argc, char **argv)
{
char devname[64];
int card, c, i;
for (;;) {
c = getopt(argc, argv, "h");
if (c == -1)
break;
switch (c) {
case 'h':
usage(stdout);
exit(0);
default:
usage(stderr);
exit(1);
}
}
for (i = 0;; i++) {
snprintf(devname, sizeof(devname), DRM_DEV_NAME, DRM_DIR_NAME, i);
if (access(devname, R_OK | W_OK) != 0)
break;
card = drm_init_dev(devname);
close(card);
}
return 0;
}
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