1 /*
2 * Derived from drm_pci.c
3 *
4 * Copyright 2003 José Fonseca.
5 * Copyright 2003 Leif Delgass.
6 * Copyright (c) 2009, Code Aurora Forum.
7 * All Rights Reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the next
17 * paragraph) shall be included in all copies or substantial portions of the
18 * Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
24 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28 #include <linux/export.h>
29 #include <drm/drmP.h>
30
31 /*
32 * Register.
33 *
34 * \param platdev - Platform device struture
35 * \return zero on success or a negative number on failure.
36 *
37 * Attempt to gets inter module "drm" information. If we are first
38 * then register the character device and inter module information.
39 * Try and register, if we fail to register, backout previous work.
40 */
41
drm_get_platform_dev(struct platform_device * platdev,struct drm_driver * driver)42 static int drm_get_platform_dev(struct platform_device *platdev,
43 struct drm_driver *driver)
44 {
45 struct drm_device *dev;
46 int ret;
47
48 DRM_DEBUG("\n");
49
50 dev = drm_dev_alloc(driver, &platdev->dev);
51 if (!dev)
52 return -ENOMEM;
53
54 dev->platformdev = platdev;
55
56 ret = drm_dev_register(dev, 0);
57 if (ret)
58 goto err_free;
59
60 DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
61 driver->name, driver->major, driver->minor, driver->patchlevel,
62 driver->date, dev->primary->index);
63
64 return 0;
65
66 err_free:
67 drm_dev_unref(dev);
68 return ret;
69 }
70
drm_platform_set_busid(struct drm_device * dev,struct drm_master * master)71 int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
72 {
73 int id;
74
75 id = dev->platformdev->id;
76 if (id < 0)
77 id = 0;
78
79 master->unique = kasprintf(GFP_KERNEL, "platform:%s:%02d",
80 dev->platformdev->name, id);
81 if (!master->unique)
82 return -ENOMEM;
83
84 master->unique_len = strlen(master->unique);
85 return 0;
86 }
87 EXPORT_SYMBOL(drm_platform_set_busid);
88
89 /**
90 * drm_platform_init - Register a platform device with the DRM subsystem
91 * @driver: DRM device driver
92 * @platform_device: platform device to register
93 *
94 * Registers the specified DRM device driver and platform device with the DRM
95 * subsystem, initializing a drm_device structure and calling the driver's
96 * .load() function.
97 *
98 * Return: 0 on success or a negative error code on failure.
99 */
drm_platform_init(struct drm_driver * driver,struct platform_device * platform_device)100 int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
101 {
102 DRM_DEBUG("\n");
103
104 return drm_get_platform_dev(platform_device, driver);
105 }
106 EXPORT_SYMBOL(drm_platform_init);
107