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 <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
  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                 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, 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;
 162 err:
 163         return ret;
 164 }
 165
 166 static 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
 185 int 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 }
 194 EXPORT_SYMBOL(drm_platform_init);
 195
 196 void 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 }
 205 EXPORT_SYMBOL(drm_platform_exit);