/*
 * Copyright © 2007 Intel Corporation
 *
 * 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 (including the next
 * paragraph) 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.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *
 */

#include <fcntl.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include "drmtest.h"
#include "i915_drm.h"
#include "intel_chipset.h"

static int
is_intel(int fd)
{
	struct drm_i915_getparam gp;
	int devid;

	gp.param = I915_PARAM_CHIPSET_ID;
	gp.value = &devid;

	if (ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp, sizeof(gp)))
		return 0;

	return IS_INTEL(devid);
}

/** Open the first DRM device we can find, searching up to 16 device nodes */
int drm_open_any(void)
{
	char name[20];
	int i, fd;

	for (i = 0; i < 16; i++) {
		sprintf(name, "/dev/dri/card%d", i);
		fd = open(name, O_RDWR);
		if (fd == -1)
			continue;

		if (is_intel(fd))
			return fd;

		close(fd);
	}
	fprintf(stderr, "failed to open any drm device. retry as root?\n");
	abort();
}


/**
 * Open the first DRM device we can find where we end up being the master.
 */
int drm_open_any_master(void)
{
	char name[20];
	int i, fd;

	for (i = 0; i < 16; i++) {
		drm_client_t client;
		int ret;

		sprintf(name, "/dev/dri/card%d", i);
		fd = open(name, O_RDWR);
		if (fd == -1)
			continue;

		if (!is_intel(fd)) {
			close(fd);
			continue;
		}

		/* Check that we're the only opener and authed. */
		client.idx = 0;
		ret = ioctl(fd, DRM_IOCTL_GET_CLIENT, &client);
		assert (ret == 0);
		if (!client.auth) {
			close(fd);
			continue;
		}
		client.idx = 1;
		ret = ioctl(fd, DRM_IOCTL_GET_CLIENT, &client);
		if (ret != -1 || errno != EINVAL) {
			close(fd);
			continue;
		}
		return fd;
	}
	fprintf(stderr, "Couldn't find an un-controlled DRM device\n");
	abort();
}