Root/drivers/gpu/drm/drm_usb.c

1#include "drmP.h"
2#include <linux/usb.h>
3#include <linux/module.h>
4
5int drm_get_usb_dev(struct usb_interface *interface,
6            const struct usb_device_id *id,
7            struct drm_driver *driver)
8{
9    struct drm_device *dev;
10    struct usb_device *usbdev;
11    int ret;
12
13    DRM_DEBUG("\n");
14
15    dev = kzalloc(sizeof(*dev), GFP_KERNEL);
16    if (!dev)
17        return -ENOMEM;
18
19    usbdev = interface_to_usbdev(interface);
20    dev->usbdev = usbdev;
21    dev->dev = &usbdev->dev;
22
23    mutex_lock(&drm_global_mutex);
24
25    ret = drm_fill_in_dev(dev, NULL, driver);
26    if (ret) {
27        printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
28        goto err_g1;
29    }
30
31    usb_set_intfdata(interface, dev);
32    ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
33    if (ret)
34        goto err_g1;
35
36    ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
37    if (ret)
38        goto err_g2;
39
40    if (dev->driver->load) {
41        ret = dev->driver->load(dev, 0);
42        if (ret)
43            goto err_g3;
44    }
45
46    /* setup the grouping for the legacy output */
47    ret = drm_mode_group_init_legacy_group(dev,
48                           &dev->primary->mode_group);
49    if (ret)
50        goto err_g3;
51
52    list_add_tail(&dev->driver_item, &driver->device_list);
53
54    mutex_unlock(&drm_global_mutex);
55
56    DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
57         driver->name, driver->major, driver->minor, driver->patchlevel,
58         driver->date, dev->primary->index);
59
60    return 0;
61
62err_g3:
63    drm_put_minor(&dev->primary);
64err_g2:
65    drm_put_minor(&dev->control);
66err_g1:
67    kfree(dev);
68    mutex_unlock(&drm_global_mutex);
69    return ret;
70
71}
72EXPORT_SYMBOL(drm_get_usb_dev);
73
74static int drm_usb_get_irq(struct drm_device *dev)
75{
76    return 0;
77}
78
79static const char *drm_usb_get_name(struct drm_device *dev)
80{
81    return "USB";
82}
83
84static int drm_usb_set_busid(struct drm_device *dev,
85                   struct drm_master *master)
86{
87    return 0;
88}
89
90static struct drm_bus drm_usb_bus = {
91    .bus_type = DRIVER_BUS_USB,
92    .get_irq = drm_usb_get_irq,
93    .get_name = drm_usb_get_name,
94    .set_busid = drm_usb_set_busid,
95};
96    
97int drm_usb_init(struct drm_driver *driver, struct usb_driver *udriver)
98{
99    int res;
100    DRM_DEBUG("\n");
101
102    INIT_LIST_HEAD(&driver->device_list);
103    driver->kdriver.usb = udriver;
104    driver->bus = &drm_usb_bus;
105
106    res = usb_register(udriver);
107    return res;
108}
109EXPORT_SYMBOL(drm_usb_init);
110
111void drm_usb_exit(struct drm_driver *driver,
112          struct usb_driver *udriver)
113{
114    usb_deregister(udriver);
115}
116EXPORT_SYMBOL(drm_usb_exit);
117
118MODULE_AUTHOR("David Airlie");
119MODULE_DESCRIPTION("USB DRM support");
120MODULE_LICENSE("GPL and additional rights");
121

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