/* * Derived from drm_pci.c * * Copyright 2003 José Fonseca. * Copyright 2003 Leif Delgass. * Copyright (c) 2009, Code Aurora Forum. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include <linux/export.h>#include <drm/drmP.h> /* * Register. * * \param platdev - Platform device struture * \return zero on success or a negative number on failure. * * Attempt to gets inter module "drm" information. If we are first * then register the character device and inter module information. * Try and register, if we fail to register, backout previous work. */ static int drm_get_platform_dev(struct platform_device *platdev,				struct drm_driver *driver){	struct drm_device *dev;	int ret; 	DRM_DEBUG("\n"); 	dev = drm_dev_alloc(driver, &platdev->dev);	if (!dev)		return -ENOMEM; 	dev->platformdev = platdev; 	ret = drm_dev_register(dev, 0);	if (ret)		goto err_free; 	DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",		 driver->name, driver->major, driver->minor, driver->patchlevel,		 driver->date, dev->primary->index); 	return 0; err_free:	drm_dev_unref(dev);	return ret;} static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master){	int len, ret, id; 	master->unique_len = 13 + strlen(dev->platformdev->name);	master->unique_size = master->unique_len;	master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL); 	if (master->unique == NULL)		return -ENOMEM; 	id = dev->platformdev->id; 	/* if only a single instance of the platform device, id will be	 * set to -1.. use 0 instead to avoid a funny looking bus-id:	 */	if (id == -1)		id = 0; 	len = snprintf(master->unique, master->unique_len,			"platform:%s:%02d", dev->platformdev->name, id); 	if (len > master->unique_len) {		DRM_ERROR("Unique buffer overflowed\n");		ret = -EINVAL;		goto err;	} 	return 0;err:	return ret;} static struct drm_bus drm_platform_bus = {	.set_busid = drm_platform_set_busid,}; /** * drm_platform_init - Register a platform device with the DRM subsystem * @driver: DRM device driver * @platform_device: platform device to register * * Registers the specified DRM device driver and platform device with the DRM * subsystem, initializing a drm_device structure and calling the driver's * .load() function. * * Return: 0 on success or a negative error code on failure. */int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device){	DRM_DEBUG("\n"); 	driver->bus = &drm_platform_bus;	return drm_get_platform_dev(platform_device, driver);}EXPORT_SYMBOL(drm_platform_init);