V4L/DVB (5507): Pvrusb2: Gather USB bus address info and report it

The V4L2 API requires a unique bus_info string returned as part of the
v4l2_capability structure.  These changes gather up the USB address
information, from the underlying device, into a string and report that
out through v4l2 and via sysfs (for completeness).

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/media/video/pvrusb2/pvrusb2-hdw.c b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
index 504301ee56fe..acf651e01f94 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-hdw.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
@@ -1008,6 +1008,13 @@ unsigned long pvr2_hdw_get_sn(struct pvr2_hdw *hdw)
         return hdw->serial_number;
 }
 
+
+const char *pvr2_hdw_get_bus_info(struct pvr2_hdw *hdw)
+{
+        return hdw->bus_info;
+}
+
+
 unsigned long pvr2_hdw_get_cur_freq(struct pvr2_hdw *hdw)
 {
         return hdw->freqSelector ? hdw->freqValTelevision : hdw->freqValRadio;
@@ -2105,6 +2112,11 @@ struct pvr2_hdw *pvr2_hdw_create(struct usb_interface *intf,
         hdw->usb_intf = intf;
         hdw->usb_dev = interface_to_usbdev(intf);
 
+        scnprintf(hdw->bus_info,sizeof(hdw->bus_info),
+                  "usb %s address %d",
+                  hdw->usb_dev->dev.bus_id,
+                  hdw->usb_dev->devnum);
+
         ifnum = hdw->usb_intf->cur_altsetting->desc.bInterfaceNumber;
         usb_set_interface(hdw->usb_dev,ifnum,0);