From: Dave Airlie <airl...@redhat.com>
This adds an implementation for the busid callback so userspace can distinguish
usb devices better.
Signed-off-by: Dave Airlie <airl...@redhat.com>
---
drivers/gpu/drm/drm_usb.c | 32 ++++++++++++++++++++++++++++++++
1 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_usb.c b/drivers/gpu/drm/drm_usb.c
index 445003f..ca77aa6 100644
--- a/drivers/gpu/drm/drm_usb.c
+++ b/drivers/gpu/drm/drm_usb.c
@@ -85,7 +85,39 @@ static const char *drm_usb_get_name(struct drm_device *dev)
static int drm_usb_set_busid(struct drm_device *dev,
struct drm_master *master)
{
+ struct usb_driver *udriver = dev->driver->kdriver.usb;
+ int len, ret;
+
+ master->unique_len = 40;
+ master->unique_size = master->unique_len;
+ master->unique = kmalloc(master->unique_size, GFP_KERNEL);
+ if (master->unique == NULL)
+ return -ENOMEM;
+
+ len = snprintf(master->unique, master->unique_len,
+ "usb:%s", dev_name(&dev->usbdev->dev));
+
+ if (len >= master->unique_len) {
+ DRM_ERROR("buffer overflow");
+ ret = -EINVAL;
+ goto err;
+ } else
+ master->unique_len = len;
+
+ dev->devname = kmalloc(strlen(udriver->name) +
+ master->unique_len + 2, GFP_KERNEL);
+
+ if (dev->devname == NULL) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ sprintf(dev->devname, "%s@%s", udriver->name,
+ master->unique);
+
return 0;
+err:
+ return ret;
}
static struct drm_bus drm_usb_bus = {
--
1.7.6
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel
