parport->dev driver model support

Currently a parport_driver can't get a handle on the device node for the
underlying parport (PNPACPI, PCI, etc).  That prevents correct placement of
sysfs child nodes, which can affect things like power management.

This patch adds a field to "struct parport" pointing to that device node, and
updates non-legacy port drivers to initialize that device pointer.  That field
replaces the analagous PCI-only support in parport_pc.

[akpm@linux-foundation.org: fix powerpc build]
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/include/linux/parport.h b/include/linux/parport.h
index 80682aaa8f18..9cdd6943e01b 100644
--- a/include/linux/parport.h
+++ b/include/linux/parport.h
@@ -279,6 +279,10 @@ struct parport {
         int dma;
         int muxport;            /* which muxport (if any) this is */
         int portnum;            /* which physical parallel port (not mux) */
+        struct device *dev;     /* Physical device associated with IO/DMA.
+                                 * This may unfortulately be null if the
+                                 * port has a legacy driver.
+                                 */
 
         struct parport *physport;
                                 /* If this is a non-default mux
@@ -289,7 +293,7 @@ struct parport {
                                    following structure members are
                                    meaningless: devices, cad, muxsel,
                                    waithead, waittail, flags, pdir,
-                                   ieee1284, *_lock.
+                                   dev, ieee1284, *_lock.
 
                                    It this is a default mux parport, or
                                    there is no mux involved, this points to
@@ -302,7 +306,7 @@ struct parport {
 
         struct pardevice *waithead;
         struct pardevice *waittail;
-        
+
         struct list_head list;
         unsigned int flags;