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>
88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
#include <drm/drmP.h>
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#include <drm/drm_usb.h>
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#include <linux/usb.h>
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#include <linux/module.h>
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int drm_get_usb_dev(struct usb_interface *interface,
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const struct usb_device_id *id,
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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, &interface->dev);
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if (!dev)
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return -ENOMEM;
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dev->usbdev = interface_to_usbdev(interface);
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usb_set_intfdata(interface, dev);
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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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EXPORT_SYMBOL(drm_get_usb_dev);
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static int drm_usb_set_busid(struct drm_device *dev,
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struct drm_master *master)
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{
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return 0;
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}
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static struct drm_bus drm_usb_bus = {
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.set_busid = drm_usb_set_busid,
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};
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/**
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* drm_usb_init - Register matching USB devices with the DRM subsystem
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* @driver: DRM device driver
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* @udriver: USB device driver
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*
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* Registers one or more devices matched by a USB driver with the DRM
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* subsystem.
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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_usb_init(struct drm_driver *driver, struct usb_driver *udriver)
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{
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int res;
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DRM_DEBUG("\n");
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driver->bus = &drm_usb_bus;
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res = usb_register(udriver);
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return res;
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}
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EXPORT_SYMBOL(drm_usb_init);
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/**
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* drm_usb_exit - Unregister matching USB devices from the DRM subsystem
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* @driver: DRM device driver
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* @udriver: USB device driver
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*
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* Unregisters one or more devices matched by a USB driver from the DRM
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* subsystem.
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*/
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void drm_usb_exit(struct drm_driver *driver,
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struct usb_driver *udriver)
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{
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usb_deregister(udriver);
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}
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EXPORT_SYMBOL(drm_usb_exit);
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MODULE_AUTHOR("David Airlie");
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MODULE_DESCRIPTION("USB DRM support");
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MODULE_LICENSE("GPL and additional rights");
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