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