nubus: Add support for the driver model

This patch brings basic support for the Linux Driver Model to the
NuBus subsystem.

For flexibility, the matching of boards with drivers is left up to the
drivers. This is also the approach taken by NetBSD. A board may have
many functions, and drivers may have to consider many functional
resources and board resources in order to match a device.

This implementation does not bind drivers to resources (nor does it bind
many drivers to the same board). Apple's NuBus declaration ROM design
is flexible enough to allow that, but I don't see a need to support it
as we don't use the "slot zero" resources (in the main logic board ROM).

Eliminate the global nubus_boards linked list by rewriting the procfs
board iterator around bus_for_each_dev(). Hence the nubus device refcount
can be used to determine the lifespan of board objects.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

1 files changed, 2 insertions, 53 deletions

diff --git a/drivers/nubus/proc.c b/drivers/nubus/proc.c
index 60c0f40b4d5e..c2e5a7e6bd3e 100644
--- a/drivers/nubus/proc.c
+++ b/drivers/nubus/proc.c
@@ -198,68 +198,17 @@ void nubus_proc_add_rsrc(struct proc_dir_entry *procdir,
 /*
  * /proc/nubus stuff
  */
-static int nubus_proc_show(struct seq_file *m, void *v)
-{
-	const struct nubus_board *board = v;
-
-	/* Display header on line 1 */
-	if (v == SEQ_START_TOKEN)
-		seq_puts(m, "Nubus devices found:\n");
-	else
-		seq_printf(m, "Slot %X: %s\n", board->slot, board->name);
-	return 0;
-}
-
-static void *nubus_proc_start(struct seq_file *m, loff_t *_pos)
-{
-	struct nubus_board *board;
-	unsigned pos;
-
-	if (*_pos > LONG_MAX)
-		return NULL;
-	pos = *_pos;
-	if (pos == 0)
-		return SEQ_START_TOKEN;
-	for (board = nubus_boards; board; board = board->next)
-		if (--pos == 0)
-			break;
-	return board;
-}
-
-static void *nubus_proc_next(struct seq_file *p, void *v, loff_t *_pos)
-{
-	/* Walk the list of NuBus boards */
-	struct nubus_board *board = v;
-
-	++*_pos;
-	if (v == SEQ_START_TOKEN)
-		board = nubus_boards;
-	else if (board)
-		board = board->next;
-	return board;
-}
-
-static void nubus_proc_stop(struct seq_file *p, void *v)
-{
-}
-
-static const struct seq_operations nubus_proc_seqops = {
-	.start	= nubus_proc_start,
-	.next	= nubus_proc_next,
-	.stop	= nubus_proc_stop,
-	.show	= nubus_proc_show,
-};
 
 static int nubus_proc_open(struct inode *inode, struct file *file)
 {
-	return seq_open(file, &nubus_proc_seqops);
+	return single_open(file, nubus_proc_show, NULL);
 }
 
 static const struct file_operations nubus_proc_fops = {
 	.open		= nubus_proc_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
-	.release	= seq_release,
+	.release	= single_release,
 };
 
 void __init nubus_proc_init(void)