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_unref(dev);
 68	return ret;
 69}
 70
 71int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
 72{
 73	int id;
 74
 75	id = dev->platformdev->id;
 76	if (id < 0)
 77		id = 0;
 78
 79	master->unique = kasprintf(GFP_KERNEL, "platform:%s:%02d",
 80						dev->platformdev->name, id);
 81	if (!master->unique)
 82		return -ENOMEM;
 83
 84	master->unique_len = strlen(master->unique);
 85	return 0;
 86}
 87EXPORT_SYMBOL(drm_platform_set_busid);
 88
 89/**
 90 * drm_platform_init - Register a platform device with the DRM subsystem
 91 * @driver: DRM device driver
 92 * @platform_device: platform device to register
 93 *
 94 * Registers the specified DRM device driver and platform device with the DRM
 95 * subsystem, initializing a drm_device structure and calling the driver's
 96 * .load() function.
 97 *
 98 * NOTE: This function is deprecated, please use drm_dev_alloc() and
 99 * drm_dev_register() instead and remove your ->load() callback.
100 *
101 * Return: 0 on success or a negative error code on failure.
102 */
103int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
104{
105	DRM_DEBUG("\n");
106
107	return drm_get_platform_dev(platform_device, driver);
108}
109EXPORT_SYMBOL(drm_platform_init);