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 "drmP.h"
29
30/**
31 * Register.
32 *
33 * \param platdev - Platform device struture
34 * \return zero on success or a negative number on failure.
35 *
36 * Attempt to gets inter module "drm" information. If we are first
37 * then register the character device and inter module information.
38 * Try and register, if we fail to register, backout previous work.
39 */
40
41int drm_get_platform_dev(struct platform_device *platdev,
42 struct drm_driver *driver)
43{
44 struct drm_device *dev;
45 int ret;
46
47 DRM_DEBUG("\n");
48
49 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
50 if (!dev)
51 return -ENOMEM;
52
53 dev->platformdev = platdev;
54 dev->dev = &platdev->dev;
55
56 mutex_lock(&drm_global_mutex);
57
58 ret = drm_fill_in_dev(dev, NULL, driver);
59
60 if (ret) {
61 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
62 goto err_g1;
63 }
64
65 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
66 dev_set_drvdata(&platdev->dev, dev);
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;
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 len = snprintf(master->unique, master->unique_len,
134 "platform:%s:%02d", dev->platformdev->name, dev->platformdev->id);
135
136 if (len > master->unique_len) {
137 DRM_ERROR("Unique buffer overflowed\n");
138 ret = -EINVAL;
139 goto err;
140 }
141
142 dev->devname =
143 kmalloc(strlen(dev->platformdev->name) +
144 master->unique_len + 2, GFP_KERNEL);
145
146 if (dev->devname == NULL) {
147 ret = -ENOMEM;
148 goto err;
149 }
150
151 sprintf(dev->devname, "%s@%s", dev->platformdev->name,
152 master->unique);
153 return 0;
154err:
155 return ret;
156}
157
158static struct drm_bus drm_platform_bus = {
159 .bus_type = DRIVER_BUS_PLATFORM,
160 .get_irq = drm_platform_get_irq,
161 .get_name = drm_platform_get_name,
162 .set_busid = drm_platform_set_busid,
163};
164
165/**
166 * Platform device initialization. Called direct from modules.
167 *
168 * \return zero on success or a negative number on failure.
169 *
170 * Initializes a drm_device structures,registering the
171 * stubs
172 *
173 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
174 * after the initialization for driver customization.
175 */
176
177int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
178{
179 DRM_DEBUG("\n");
180
181 driver->kdriver.platform_device = platform_device;
182 driver->bus = &drm_platform_bus;
183 INIT_LIST_HEAD(&driver->device_list);
184 return drm_get_platform_dev(platform_device, driver);
185}
186EXPORT_SYMBOL(drm_platform_init);
187
188void drm_platform_exit(struct drm_driver *driver, struct platform_device *platform_device)
189{
190 struct drm_device *dev, *tmp;
191 DRM_DEBUG("\n");
192
193 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
194 drm_put_dev(dev);
195 DRM_INFO("Module unloaded\n");
196}
197EXPORT_SYMBOL(drm_platform_exit);