Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
42static 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
66err_free:
67 drm_dev_free(dev);
68 return ret;
69}
70
71static int drm_platform_get_irq(struct drm_device *dev)
72{
73 return platform_get_irq(dev->platformdev, 0);
74}
75
76static const char *drm_platform_get_name(struct drm_device *dev)
77{
78 return dev->platformdev->name;
79}
80
81static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
82{
83 int len, ret, id;
84
85 master->unique_len = 13 + strlen(dev->platformdev->name);
86 master->unique_size = master->unique_len;
87 master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
88
89 if (master->unique == NULL)
90 return -ENOMEM;
91
92 id = dev->platformdev->id;
93
94 /* if only a single instance of the platform device, id will be
95 * set to -1.. use 0 instead to avoid a funny looking bus-id:
96 */
97 if (id == -1)
98 id = 0;
99
100 len = snprintf(master->unique, master->unique_len,
101 "platform:%s:%02d", dev->platformdev->name, id);
102
103 if (len > master->unique_len) {
104 DRM_ERROR("Unique buffer overflowed\n");
105 ret = -EINVAL;
106 goto err;
107 }
108
109 dev->devname =
110 kmalloc(strlen(dev->platformdev->name) +
111 master->unique_len + 2, GFP_KERNEL);
112
113 if (dev->devname == NULL) {
114 ret = -ENOMEM;
115 goto err;
116 }
117
118 sprintf(dev->devname, "%s@%s", dev->platformdev->name,
119 master->unique);
120 return 0;
121err:
122 return ret;
123}
124
125static struct drm_bus drm_platform_bus = {
126 .bus_type = DRIVER_BUS_PLATFORM,
127 .get_irq = drm_platform_get_irq,
128 .get_name = drm_platform_get_name,
129 .set_busid = drm_platform_set_busid,
130};
131
132/**
133 * Platform device initialization. Called direct from modules.
134 *
135 * \return zero on success or a negative number on failure.
136 *
137 * Initializes a drm_device structures,registering the
138 * stubs
139 *
140 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
141 * after the initialization for driver customization.
142 */
143
144int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
145{
146 DRM_DEBUG("\n");
147
148 driver->kdriver.platform_device = platform_device;
149 driver->bus = &drm_platform_bus;
150 INIT_LIST_HEAD(&driver->device_list);
151 return drm_get_platform_dev(platform_device, driver);
152}
153EXPORT_SYMBOL(drm_platform_init);
154
155void drm_platform_exit(struct drm_driver *driver, struct platform_device *platform_device)
156{
157 struct drm_device *dev, *tmp;
158 DRM_DEBUG("\n");
159
160 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
161 drm_put_dev(dev);
162 DRM_INFO("Module unloaded\n");
163}
164EXPORT_SYMBOL(drm_platform_exit);