LXR linux/drivers/gpu/drm/drm

   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
  42static 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 = drm_dev_alloc(driver, &platdev->dev);
  51        if (!dev)
  52                return -ENOMEM;
  53
  54        dev->platformdev = platdev;
  55
  56        ret = drm_dev_register(dev, 0);
  57        if (ret)
  58                goto err_free;
  59
  60        DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
  61                 driver->name, driver->major, driver->minor, driver->patchlevel,
  62                 driver->date, dev->primary->index);
  63
  64        return 0;
  65
  66err_free:
  67        drm_dev_free(dev);
  68        return ret;
  69}
  70
  71static int drm_platform_get_irq(struct drm_device *dev)
  72{
  73        return platform_get_irq(dev->platformdev, 0);
  74}
  75
  76static const char *drm_platform_get_name(struct drm_device *dev)
  77{
  78        return dev->platformdev->name;
  79}
  80
  81static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
  82{
  83        int len, ret, id;
  84
  85        master->unique_len = 13 + strlen(dev->platformdev->name);
  86        master->unique_size = master->unique_len;
  87        master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
  88
  89        if (master->unique == NULL)
  90                return -ENOMEM;
  91
  92        id = dev->platformdev->id;
  93
  94        /* if only a single instance of the platform device, id will be
  95         * set to -1.. use 0 instead to avoid a funny looking bus-id:
  96         */
  97        if (id == -1)
  98                id = 0;
  99
 100        len = snprintf(master->unique, master->unique_len,
 101                        "platform:%s:%02d", dev->platformdev->name, id);
 102
 103        if (len > master->unique_len) {
 104                DRM_ERROR("Unique buffer overflowed\n");
 105                ret = -EINVAL;
 106                goto err;
 107        }
 108
 109        dev->devname =
 110                kmalloc(strlen(dev->platformdev->name) +
 111                        master->unique_len + 2, GFP_KERNEL);
 112
 113        if (dev->devname == NULL) {
 114                ret = -ENOMEM;
 115                goto err;
 116        }
 117
 118        sprintf(dev->devname, "%s@%s", dev->platformdev->name,
 119                master->unique);
 120        return 0;
 121err:
 122        return ret;
 123}
 124
 125static struct drm_bus drm_platform_bus = {
 126        .bus_type = DRIVER_BUS_PLATFORM,
 127        .get_irq = drm_platform_get_irq,
 128        .get_name = drm_platform_get_name,
 129        .set_busid = drm_platform_set_busid,
 130};
 131
 132/**
 133 * Platform device initialization. Called direct from modules.
 134 *
 135 * \return zero on success or a negative number on failure.
 136 *
 137 * Initializes a drm_device structures,registering the
 138 * stubs
 139 *
 140 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 141 * after the initialization for driver customization.
 142 */
 143
 144int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
 145{
 146        DRM_DEBUG("\n");
 147
 148        driver->kdriver.platform_device = platform_device;
 149        driver->bus = &drm_platform_bus;
 150        return drm_get_platform_dev(platform_device, driver);
 151}
 152EXPORT_SYMBOL(drm_platform_init);
 153