drm: add usb framework
Dave Airlie [Tue, 14 Dec 2010 21:13:55 +0000 (07:13 +1000)]
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>

drivers/gpu/drm/Makefile
drivers/gpu/drm/drm_stub.c
drivers/gpu/drm/drm_usb.c [new file with mode: 0644]
include/drm/drmP.h
include/drm/drm_usb.h [new file with mode: 0644]

index d9cb3e3..89cf05a 100644 (file)
@@ -12,7 +12,7 @@ drm-y       :=        drm_auth.o drm_buffer.o drm_bufs.o drm_cache.o \
                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
 
index 0bf2c77..001273d 100644 (file)
@@ -463,6 +463,7 @@ void drm_put_dev(struct drm_device *dev)
 
        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 (file)
index 0000000..206d230
--- /dev/null
@@ -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
index a99aefb..52a2fd2 100644 (file)
@@ -925,6 +925,7 @@ struct drm_driver {
        union {
                struct pci_driver *pci;
                struct platform_device *platform_device;
+               struct usb_driver *usb;
        } kdriver;
        struct drm_bus *bus;
 
@@ -1130,6 +1131,7 @@ struct drm_device {
 #endif
 
        struct platform_device *platformdev; /**< Platform device struture */
+       struct usb_device *usbdev;
 
        struct drm_sg_mem *sg;  /**< Scatter gather memory */
        int num_crtcs;                  /**< Number of CRTCs on this device */
diff --git a/include/drm/drm_usb.h b/include/drm/drm_usb.h
new file mode 100644 (file)
index 0000000..33506c1
--- /dev/null
@@ -0,0 +1,15 @@
+#ifndef DRM_USB_H
+#define DRM_USB_H
+
+#include <drmP.h>
+
+#include <linux/usb.h>
+
+extern int drm_usb_init(struct drm_driver *driver, struct usb_driver *udriver);
+extern void drm_usb_exit(struct drm_driver *driver, struct usb_driver *udriver);
+
+int drm_get_usb_dev(struct usb_interface *interface,
+                   const struct usb_device_id *id,
+                   struct drm_driver *driver);
+
+#endif