ALSA: snd-aoa: handle older machines

This patch changes snd-aoa to handle some older machines that are
currently handled by snd-powermac. snd-aoa has a number of advantages
though, notably it can autoload better and is generally a more modern
driver.

By hardcoding the accepted device-ids (last hunk of the patch) I'm
trying to avoid regressions because this driver will otherwise load
automatically and not let snd-powermac load. People who are unhappy
with snd-powermac and have a device-id property in the device tree
are encouraged to read this patch and make a patch to amend this as
appropriate.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 17 insertions, 5 deletions

diff --git a/sound/aoa/soundbus/i2sbus/core.c b/sound/aoa/soundbus/i2sbus/core.c
index be468edf3ec..418c84c99d6 100644
--- a/sound/aoa/soundbus/i2sbus/core.c
+++ b/sound/aoa/soundbus/i2sbus/core.c
@@ -1,7 +1,7 @@
 /*
  * i2sbus driver
  *
- * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net>
  *
  * GPL v2, can be found in COPYING.
  */
@@ -186,13 +186,25 @@ static int i2sbus_add_dev(struct macio_dev *macio,
                 }
         }
         if (i == 1) {
-                const u32 *layout_id =
-                        of_get_property(sound, "layout-id", NULL);
-                if (layout_id) {
-                        layout = *layout_id;
+                const u32 *id = of_get_property(sound, "layout-id", NULL);
+
+                if (id) {
+                        layout = *id;
                         snprintf(dev->sound.modalias, 32,
                                  "sound-layout-%d", layout);
                         ok = 1;
+                } else {
+                        id = of_get_property(sound, "device-id", NULL);
+                        /*
+                         * We probably cannot handle all device-id machines,
+                         * so restrict to those we do handle for now.
+                         */
+                        if (id && (*id == 22 || *id == 14 || *id == 35)) {
+                                snprintf(dev->sound.modalias, 32,
+                                         "aoa-device-id-%d", *id);
+                                ok = 1;
+                                layout = -1;
+                        }
                 }
         }
         /* for the time being, until we can handle non-layout-id