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
42int 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 = kzalloc(sizeof(*dev), GFP_KERNEL);
51 if (!dev)
52 return -ENOMEM;
53
54 dev->platformdev = platdev;
55 dev->dev = &platdev->dev;
56
57 mutex_lock(&drm_global_mutex);
58
59 ret = drm_fill_in_dev(dev, NULL, driver);
60
61 if (ret) {
62 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
63 goto err_g1;
64 }
65
66 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
67 ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
68 if (ret)
69 goto err_g1;
70 }
71
72 ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
73 if (ret)
74 goto err_g2;
75
76 if (dev->driver->load) {
77 ret = dev->driver->load(dev, 0);
78 if (ret)
79 goto err_g3;
80 }
81
82 /* setup the grouping for the legacy output */
83 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
84 ret = drm_mode_group_init_legacy_group(dev,
85 &dev->primary->mode_group);
86 if (ret)
87 goto err_g3;
88 }
89
90 list_add_tail(&dev->driver_item, &driver->device_list);
91
92 mutex_unlock(&drm_global_mutex);
93
94 DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
95 driver->name, driver->major, driver->minor, driver->patchlevel,
96 driver->date, dev->primary->index);
97
98 return 0;
99
100err_g3:
101 drm_put_minor(&dev->primary);
102err_g2:
103 if (drm_core_check_feature(dev, DRIVER_MODESET))
104 drm_put_minor(&dev->control);
105err_g1:
106 kfree(dev);
107 mutex_unlock(&drm_global_mutex);
108 return ret;
109}
110EXPORT_SYMBOL(drm_get_platform_dev);
111
112static int drm_platform_get_irq(struct drm_device *dev)
113{
114 return platform_get_irq(dev->platformdev, 0);
115}
116
117static const char *drm_platform_get_name(struct drm_device *dev)
118{
119 return dev->platformdev->name;
120}
121
122static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
123{
124 int len, ret, id;
125
126 master->unique_len = 13 + strlen(dev->platformdev->name);
127 master->unique_size = master->unique_len;
128 master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
129
130 if (master->unique == NULL)
131 return -ENOMEM;
132
133 id = dev->platformdev->id;
134
135 /* if only a single instance of the platform device, id will be
136 * set to -1.. use 0 instead to avoid a funny looking bus-id:
137 */
138 if (id == -1)
139 id = 0;
140
141 len = snprintf(master->unique, master->unique_len,
142 "platform:%s:%02d", dev->platformdev->name, id);
143
144 if (len > master->unique_len) {
145 DRM_ERROR("Unique buffer overflowed\n");
146 ret = -EINVAL;
147 goto err;
148 }
149
150 dev->devname =
151 kmalloc(strlen(dev->platformdev->name) +
152 master->unique_len + 2, GFP_KERNEL);
153
154 if (dev->devname == NULL) {
155 ret = -ENOMEM;
156 goto err;
157 }
158
159 sprintf(dev->devname, "%s@%s", dev->platformdev->name,
160 master->unique);
161 return 0;
162err:
163 return ret;
164}
165
166static struct drm_bus drm_platform_bus = {
167 .bus_type = DRIVER_BUS_PLATFORM,
168 .get_irq = drm_platform_get_irq,
169 .get_name = drm_platform_get_name,
170 .set_busid = drm_platform_set_busid,
171};
172
173/**
174 * Platform device initialization. Called direct from modules.
175 *
176 * \return zero on success or a negative number on failure.
177 *
178 * Initializes a drm_device structures,registering the
179 * stubs
180 *
181 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
182 * after the initialization for driver customization.
183 */
184
185int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
186{
187 DRM_DEBUG("\n");
188
189 driver->kdriver.platform_device = platform_device;
190 driver->bus = &drm_platform_bus;
191 INIT_LIST_HEAD(&driver->device_list);
192 return drm_get_platform_dev(platform_device, driver);
193}
194EXPORT_SYMBOL(drm_platform_init);
195
196void drm_platform_exit(struct drm_driver *driver, struct platform_device *platform_device)
197{
198 struct drm_device *dev, *tmp;
199 DRM_DEBUG("\n");
200
201 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
202 drm_put_dev(dev);
203 DRM_INFO("Module unloaded\n");
204}
205EXPORT_SYMBOL(drm_platform_exit);