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/* wld: drm.c
*
* Copyright (c) 2013, 2014 Michael Forney
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "drm.h"
#include "drm-private.h"
#include <sys/sysmacros.h>
const static struct drm_driver * drivers[] = {
#if WITH_DRM_INTEL
&intel_drm_driver,
#endif
#if WITH_DRM_NOUVEAU
&nouveau_drm_driver,
#endif
&dumb_drm_driver
};
static const struct drm_driver * find_driver(int fd)
{
char path[64], id[32];
uint32_t vendor_id, device_id;
char * path_part;
struct stat st;
FILE * file;
uint32_t index;
int n;
if (fstat(fd, &st) == -1)
return NULL;
if (getenv("WLD_DRM_DUMB"))
goto dumb;
n = snprintf(path, sizeof(path), "/sys/dev/char/%u:%u/device/", major(st.st_rdev), minor(st.st_rdev));
if (n + 6 >= sizeof(path))
return NULL;
path_part = path + n;
strcpy(path_part, "vendor");
file = fopen(path, "r");
if (!file)
goto dumb;
fgets(id, sizeof id, file);
fclose(file);
vendor_id = strtoul(id, NULL, 0);
strcpy(path_part, "device");
file = fopen(path, "r");
if (!file)
goto dumb;
fgets(id, sizeof id, file);
fclose(file);
device_id = strtoul(id, NULL, 0);
for (index = 0; index < ARRAY_LENGTH(drivers); ++index)
{
DEBUG("Trying DRM driver `%s'\n", drivers[index]->name);
if (drivers[index]->device_supported(vendor_id, device_id))
return drivers[index];
}
DEBUG("No DRM driver supports device 0x%x:0x%x\n", vendor_id, device_id);
return NULL;
dumb:
return &dumb_drm_driver;
}
EXPORT
struct wld_context * wld_drm_create_context(int fd)
{
const struct drm_driver * driver;
if (!(driver = find_driver(fd)))
return NULL;
return driver->create_context(fd);
}
EXPORT
bool wld_drm_is_dumb(struct wld_context * context)
{
return context->impl == dumb_context_impl;
}
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