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 "drmP.h"
 29
 30/**
 31 * Register.
 32 *
 33 * \param platdev - Platform device struture
 34 * \return zero on success or a negative number on failure.
 35 *
 36 * Attempt to gets inter module "drm" information. If we are first
 37 * then register the character device and inter module information.
 38 * Try and register, if we fail to register, backout previous work.
 39 */
 40
 41int drm_get_platform_dev(struct platform_device *platdev,
 42			 struct drm_driver *driver)
 43{
 44	struct drm_device *dev;
 45	int ret;
 46
 47	DRM_DEBUG("\n");
 48
 49	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 50	if (!dev)
 51		return -ENOMEM;
 52
 53	dev->platformdev = platdev;
 54	dev->dev = &platdev->dev;
 55
 56	mutex_lock(&drm_global_mutex);
 57
 58	ret = drm_fill_in_dev(dev, NULL, driver);
 59
 60	if (ret) {
 61		printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
 62		goto err_g1;
 63	}
 64
 65	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 66		dev_set_drvdata(&platdev->dev, dev);
 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
100err_g3:
101	drm_put_minor(&dev->primary);
102err_g2:
103	if (drm_core_check_feature(dev, DRIVER_MODESET))
104		drm_put_minor(&dev->control);
105err_g1:
106	kfree(dev);
107	mutex_unlock(&drm_global_mutex);
108	return ret;
109}
110EXPORT_SYMBOL(drm_get_platform_dev);
111
112static int drm_platform_get_irq(struct drm_device *dev)
113{
114	return platform_get_irq(dev->platformdev, 0);
115}
116
117static const char *drm_platform_get_name(struct drm_device *dev)
118{
119	return dev->platformdev->name;
120}
121
122static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
123{
124	int len, ret;
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	len = snprintf(master->unique, master->unique_len,
134			"platform:%s:%02d", dev->platformdev->name, dev->platformdev->id);
135
136	if (len > master->unique_len) {
137		DRM_ERROR("Unique buffer overflowed\n");
138		ret = -EINVAL;
139		goto err;
140	}
141
142	dev->devname =
143		kmalloc(strlen(dev->platformdev->name) +
144			master->unique_len + 2, GFP_KERNEL);
145
146	if (dev->devname == NULL) {
147		ret = -ENOMEM;
148		goto err;
149	}
150
151	sprintf(dev->devname, "%s@%s", dev->platformdev->name,
152		master->unique);
153	return 0;
154err:
155	return ret;
156}
157
158static struct drm_bus drm_platform_bus = {
159	.bus_type = DRIVER_BUS_PLATFORM,
160	.get_irq = drm_platform_get_irq,
161	.get_name = drm_platform_get_name,
162	.set_busid = drm_platform_set_busid,
163};
164
165/**
166 * Platform device initialization. Called direct from modules.
167 *
168 * \return zero on success or a negative number on failure.
169 *
170 * Initializes a drm_device structures,registering the
171 * stubs
172 *
173 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
174 * after the initialization for driver customization.
175 */
176
177int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
178{
179	DRM_DEBUG("\n");
180
181	driver->kdriver.platform_device = platform_device;
182	driver->bus = &drm_platform_bus;
183	INIT_LIST_HEAD(&driver->device_list);
184	return drm_get_platform_dev(platform_device, driver);
185}
186EXPORT_SYMBOL(drm_platform_init);
187
188void drm_platform_exit(struct drm_driver *driver, struct platform_device *platform_device)
189{
190	struct drm_device *dev, *tmp;
191	DRM_DEBUG("\n");
192
193	list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
194		drm_put_dev(dev);
195	DRM_INFO("Module unloaded\n");
196}
197EXPORT_SYMBOL(drm_platform_exit);