drm_usb.c

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#include <drm/drmP.h>
#include <linux/usb.h>
#include <linux/module.h>

int drm_get_usb_dev(struct usb_interface *interface,
            const struct usb_device_id *id,
            struct drm_driver *driver)
{
    struct drm_device *dev;
    struct usb_device *usbdev;
    int ret;

    DRM_DEBUG("\n");

    dev = kzalloc(sizeof(*dev), GFP_KERNEL);
    if (!dev)
        return -ENOMEM;

    usbdev = interface_to_usbdev(interface);
    dev->usbdev = usbdev;
    dev->dev = &usbdev->dev;

    mutex_lock(&drm_global_mutex);

    ret = drm_fill_in_dev(dev, NULL, driver);
    if (ret) {
        printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
        goto err_g1;
    }

    usb_set_intfdata(interface, dev);
    ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
    if (ret)
        goto err_g1;

    ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
    if (ret)
        goto err_g2;

    if (dev->driver->load) {
        ret = dev->driver->load(dev, 0);
        if (ret)
            goto err_g3;
    }

    /* setup the grouping for the legacy output */
    ret = drm_mode_group_init_legacy_group(dev,
                           &dev->primary->mode_group);
    if (ret)
        goto err_g3;

    list_add_tail(&dev->driver_item, &driver->device_list);

    mutex_unlock(&drm_global_mutex);

    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_g3:
    drm_put_minor(&dev->primary);
err_g2:
    drm_put_minor(&dev->control);
err_g1:
    kfree(dev);
    mutex_unlock(&drm_global_mutex);
    return ret;

}
EXPORT_SYMBOL(drm_get_usb_dev);

static int drm_usb_get_irq(struct drm_device *dev)
{
    return 0;
}

static const char *drm_usb_get_name(struct drm_device *dev)
{
    return "USB";
}

static int drm_usb_set_busid(struct drm_device *dev,
                   struct drm_master *master)
{
    return 0;
}

static struct drm_bus drm_usb_bus = {
    .bus_type = DRIVER_BUS_USB,
    .get_irq = drm_usb_get_irq,
    .get_name = drm_usb_get_name,
    .set_busid = drm_usb_set_busid,
};
    
int drm_usb_init(struct drm_driver *driver, struct usb_driver *udriver)
{
    int res;
    DRM_DEBUG("\n");

    INIT_LIST_HEAD(&driver->device_list);
    driver->kdriver.usb = udriver;
    driver->bus = &drm_usb_bus;

    res = usb_register(udriver);
    return res;
}
EXPORT_SYMBOL(drm_usb_init);

void drm_usb_exit(struct drm_driver *driver,
          struct usb_driver *udriver)
{
    usb_deregister(udriver);
}
EXPORT_SYMBOL(drm_usb_exit);

MODULE_AUTHOR("David Airlie");
MODULE_DESCRIPTION("USB DRM support");
MODULE_LICENSE("GPL and additional rights");