148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/**************************************************************************
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*
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* Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Thanks to krh and jcristau for the tips on
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* going from fd to pci id via fstat and udev.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <xf86drm.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#ifdef MAJOR_IN_MKDEV
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#include <sys/mkdev.h>
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#endif
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#ifdef MAJOR_IN_SYSMACROS
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#include <sys/sysmacros.h>
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#endif
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#include "libdrm_macros.h"
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#include "internal.h"
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#define PATH_SIZE 512
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static int
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linux_name_from_sysfs(int fd, char **out)
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{
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char path[PATH_SIZE+1] = ""; /* initialize to please valgrind */
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char link[PATH_SIZE+1] = "";
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struct stat buffer;
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unsigned maj, min;
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char* slash_name;
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int ret;
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/*
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* Inside the sysfs directory for the device there is a symlink
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* to the directory representing the driver module, that path
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* happens to hold the name of the driver.
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*
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* So lets get the symlink for the drm device. Then read the link
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* and filter out the last directory which happens to be the name
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* of the driver, which we can use to load the correct interface.
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*
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* Thanks to Ray Strode of Plymouth for the code.
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*/
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ret = fstat(fd, &buffer);
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if (ret)
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return -EINVAL;
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if (!S_ISCHR(buffer.st_mode))
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return -EINVAL;
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maj = major(buffer.st_rdev);
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min = minor(buffer.st_rdev);
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snprintf(path, PATH_SIZE, "/sys/dev/char/%d:%d/device/driver", maj, min);
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if (readlink(path, link, PATH_SIZE) < 0)
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return -EINVAL;
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/* link looks something like this: ../../../bus/pci/drivers/intel */
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slash_name = strrchr(link, '/');
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if (!slash_name)
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return -EINVAL;
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/* copy name and at the same time remove the slash */
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*out = strdup(slash_name + 1);
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return 0;
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}
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static int
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linux_from_sysfs(int fd, struct kms_driver **out)
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{
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char *name;
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int ret;
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ret = linux_name_from_sysfs(fd, &name);
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if (ret)
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return ret;
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#if HAVE_INTEL
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if (!strcmp(name, "intel"))
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ret = intel_create(fd, out);
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else
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#endif
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#if HAVE_VMWGFX
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if (!strcmp(name, "vmwgfx"))
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ret = vmwgfx_create(fd, out);
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else
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#endif
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#if HAVE_NOUVEAU
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if (!strcmp(name, "nouveau"))
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ret = nouveau_create(fd, out);
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else
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#endif
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#if HAVE_RADEON
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if (!strcmp(name, "radeon"))
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ret = radeon_create(fd, out);
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else
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#endif
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#if HAVE_EXYNOS
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if (!strcmp(name, "exynos"))
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ret = exynos_create(fd, out);
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else
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#endif
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ret = -ENOSYS;
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free(name);
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return ret;
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}
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drm_private int
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linux_create(int fd, struct kms_driver **out)
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{
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if (!dumb_create(fd, out))
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return 0;
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return linux_from_sysfs(fd, out);
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}
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