drivers/gpu/drm/drm_platform.c

   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
  41 int 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
 100 err_g3:
 101         drm_put_minor(&dev->primary);
 102 err_g2:
 103         if (drm_core_check_feature(dev, DRIVER_MODESET))
 104                 drm_put_minor(&dev->control);
 105 err_g1:
 106         kfree(dev);
 107         mutex_unlock(&drm_global_mutex);
 108         return ret;
 109 }
 110 EXPORT_SYMBOL(drm_get_platform_dev);
 111
 112 static int drm_platform_get_irq(struct drm_device *dev)
 113 {
 114         return platform_get_irq(dev->platformdev, 0);
 115 }
 116
 117 static const char *drm_platform_get_name(struct drm_device *dev)
 118 {
 119         return dev->platformdev->name;
 120 }
 121
 122 static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
 123 {
 124         int len, ret;
 125
 126         master->unique_len = 10 + strlen(dev->platformdev->name);
 127         master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
 128
 129         if (master->unique == NULL)
 130                 return -ENOMEM;
 131
 132         len = snprintf(master->unique, master->unique_len,
 133                        "platform:%s", dev->platformdev->name);
 134
 135         if (len > master->unique_len) {
 136                 DRM_ERROR("Unique buffer overflowed\n");
 137                 ret = -EINVAL;
 138                 goto err;
 139         }
 140
 141         dev->devname =
 142                 kmalloc(strlen(dev->platformdev->name) +
 143                         master->unique_len + 2, GFP_KERNEL);
 144
 145         if (dev->devname == NULL) {
 146                 ret = -ENOMEM;
 147                 goto err;
 148         }
 149
 150         sprintf(dev->devname, "%s@%s", dev->platformdev->name,
 151                 master->unique);
 152         return 0;
 153 err:
 154         return ret;
 155 }
 156
 157 static struct drm_bus drm_platform_bus = {
 158         .bus_type = DRIVER_BUS_PLATFORM,
 159         .get_irq = drm_platform_get_irq,
 160         .get_name = drm_platform_get_name,
 161         .set_busid = drm_platform_set_busid,
 162 };
 163
 164 /**
 165  * Platform device initialization. Called direct from modules.
 166  *
 167  * \return zero on success or a negative number on failure.
 168  *
 169  * Initializes a drm_device structures,registering the
 170  * stubs
 171  *
 172  * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 173  * after the initialization for driver customization.
 174  */
 175
 176 int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
 177 {
 178         DRM_DEBUG("\n");
 179
 180         driver->kdriver.platform_device = platform_device;
 181         driver->bus = &drm_platform_bus;
 182         INIT_LIST_HEAD(&driver->device_list);
 183         return drm_get_platform_dev(platform_device, driver);
 184 }
 185 EXPORT_SYMBOL(drm_platform_init);
 186
 187 void drm_platform_exit(struct drm_driver *driver, struct platform_device *platform_device)
 188 {
 189         struct drm_device *dev, *tmp;
 190         DRM_DEBUG("\n");
 191
 192         list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
 193                 drm_put_dev(dev);
 194         DRM_INFO("Module unloaded\n");
 195 }
 196 EXPORT_SYMBOL(drm_platform_exit);