drm: add usb framework
This adds an initial framework to plug USB graphics devices
into the drm/kms subsystem.
I've started writing a displaylink driver using this interface.
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index d9cb3e3..89cf05a 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -12,7 +12,7 @@
drm_platform.o drm_sysfs.o drm_hashtab.o drm_sman.o drm_mm.o \
drm_crtc.o drm_modes.o drm_edid.o \
drm_info.o drm_debugfs.o drm_encoder_slave.o \
- drm_trace_points.o drm_global.o
+ drm_trace_points.o drm_global.o drm_usb.o
drm-$(CONFIG_COMPAT) += drm_ioc32.o
diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
index 0bf2c77..001273d 100644
--- a/drivers/gpu/drm/drm_stub.c
+++ b/drivers/gpu/drm/drm_stub.c
@@ -463,6 +463,7 @@
drm_put_minor(&dev->primary);
+ list_del(&dev->driver_item);
if (dev->devname) {
kfree(dev->devname);
dev->devname = NULL;
diff --git a/drivers/gpu/drm/drm_usb.c b/drivers/gpu/drm/drm_usb.c
new file mode 100644
index 0000000..206d230
--- /dev/null
+++ b/drivers/gpu/drm/drm_usb.c
@@ -0,0 +1,117 @@
+#include "drmP.h"
+#include <linux/usb.h>
+
+#ifdef CONFIG_USB
+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);
+#endif