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c6a1af8a16
Describe how devices are registered using the drm_*_init() functions.
Adding this to docbook requires a largish set of changes to the comments
in drm_{pci,usb,platform}.c since they are doxygen-style rather than
proper kernel-doc and therefore mess with the docbook generation.
While at it, mark usage of drm_put_dev() as discouraged in favour of
calling drm_dev_unregister() and drm_dev_unref() directly.
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/*
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* Derived from drm_pci.c
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*
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* Copyright 2003 José Fonseca.
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* Copyright 2003 Leif Delgass.
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* Copyright (c) 2009, Code Aurora Forum.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/export.h>
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#include <drm/drmP.h>
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/*
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* Register.
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*
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* \param platdev - Platform device struture
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* \return zero on success or a negative number on failure.
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*
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* Attempt to gets inter module "drm" information. If we are first
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* then register the character device and inter module information.
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* Try and register, if we fail to register, backout previous work.
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*/
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static int drm_get_platform_dev(struct platform_device *platdev,
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struct drm_driver *driver)
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{
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struct drm_device *dev;
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int ret;
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DRM_DEBUG("\n");
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dev = drm_dev_alloc(driver, &platdev->dev);
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if (!dev)
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return -ENOMEM;
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dev->platformdev = platdev;
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ret = drm_dev_register(dev, 0);
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if (ret)
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goto err_free;
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DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
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driver->name, driver->major, driver->minor, driver->patchlevel,
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driver->date, dev->primary->index);
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return 0;
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err_free:
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drm_dev_unref(dev);
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return ret;
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}
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static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
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{
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int len, ret, id;
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master->unique_len = 13 + strlen(dev->platformdev->name);
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master->unique_size = master->unique_len;
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master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
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if (master->unique == NULL)
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return -ENOMEM;
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id = dev->platformdev->id;
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/* if only a single instance of the platform device, id will be
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* set to -1.. use 0 instead to avoid a funny looking bus-id:
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*/
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if (id == -1)
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id = 0;
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len = snprintf(master->unique, master->unique_len,
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"platform:%s:%02d", dev->platformdev->name, id);
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if (len > master->unique_len) {
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DRM_ERROR("Unique buffer overflowed\n");
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ret = -EINVAL;
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goto err;
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}
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return 0;
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err:
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return ret;
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}
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static struct drm_bus drm_platform_bus = {
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.set_busid = drm_platform_set_busid,
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};
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/**
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* drm_platform_init - Register a platform device with the DRM subsystem
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* @driver: DRM device driver
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* @platform_device: platform device to register
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*
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* Registers the specified DRM device driver and platform device with the DRM
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* subsystem, initializing a drm_device structure and calling the driver's
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* .load() function.
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
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{
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DRM_DEBUG("\n");
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driver->bus = &drm_platform_bus;
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return drm_get_platform_dev(platform_device, driver);
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}
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EXPORT_SYMBOL(drm_platform_init);
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