1 /**************************************************************************
3 * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
28 * Thanks to krh and jcristau for the tips on
29 * going from fd to pci id via fstat and udev.
50 linux_name_from_sysfs(int fd, char **out)
52 char path[PATH_SIZE+1] = ""; /* initialize to please valgrind */
53 char link[PATH_SIZE+1] = "";
60 * Inside the sysfs directory for the device there is a symlink
61 * to the directory representing the driver module, that path
62 * happens to hold the name of the driver.
64 * So lets get the symlink for the drm device. Then read the link
65 * and filter out the last directory which happens to be the name
66 * of the driver, which we can use to load the correct interface.
68 * Thanks to Ray Strode of Plymouth for the code.
71 ret = fstat(fd, &buffer);
75 if (!S_ISCHR(buffer.st_mode))
78 maj = major(buffer.st_rdev);
79 min = minor(buffer.st_rdev);
81 snprintf(path, PATH_SIZE, "/sys/dev/char/%d:%d/device/driver", maj, min);
83 if (readlink(path, link, PATH_SIZE) < 0)
86 /* link looks something like this: ../../../bus/pci/drivers/intel */
87 slash_name = strrchr(link, '/');
91 /* copy name and at the same time remove the slash */
92 *out = strdup(slash_name + 1);
97 linux_from_sysfs(int fd, struct kms_driver **out)
102 ret = linux_name_from_sysfs(fd, &name);
106 if (!strcmp(name, "intel"))
107 ret = intel_create(fd, out);
109 else if (!strcmp(name, "vmwgfx"))
110 ret = vmwgfx_create(fd, out);
113 else if (!strcmp(name, "nouveau"))
114 ret = nouveau_create(fd, out);
117 else if (!strcmp(name, "radeon"))
118 ret = radeon_create(fd, out);
121 else if (!strcmp(name, "exynos"))
122 ret = exynos_create(fd, out);
132 #define LIBUDEV_I_KNOW_THE_API_IS_SUBJECT_TO_CHANGE
139 int (*func)(int fd, struct kms_driver **out);
142 static struct create_record table[] = {
143 { 0x8086, 0x2a42, intel_create }, /* i965 */
145 { 0x15ad, 0x0405, vmwgfx_create }, /* VMware vGPU */
151 linux_get_pciid_from_fd(int fd, unsigned *vendor_id, unsigned *chip_id)
154 struct udev_device *device;
155 struct udev_device *parent;
160 ret = fstat(fd, &buffer);
164 if (!S_ISCHR(buffer.st_mode))
171 device = udev_device_new_from_devnum(udev, 'c', buffer.st_rdev);
175 parent = udev_device_get_parent(device);
177 goto err_free_device;
179 pci_id = udev_device_get_property_value(parent, "PCI_ID");
181 goto err_free_device;
183 if (sscanf(pci_id, "%x:%x", vendor_id, chip_id) != 2)
184 goto err_free_device;
186 udev_device_unref(device);
192 udev_device_unref(device);
199 linux_from_udev(int fd, struct kms_driver **out)
201 unsigned vendor_id, chip_id;
204 ret = linux_get_pciid_from_fd(fd, &vendor_id, &chip_id);
208 for (i = 0; table[i].func; i++)
209 if (table[i].vendor == vendor_id && table[i].chip == chip_id)
210 return table[i].func(fd, out);
216 linux_from_udev(int fd, struct kms_driver **out)
223 linux_create(int fd, struct kms_driver **out)
225 if (!dumb_create(fd, out))
228 if (!linux_from_udev(fd, out))
231 return linux_from_sysfs(fd, out);