ASoC: ac97: Support multi-platform AC'97

Currently we can only have a single platform built in with AC'97 support
due to the use of a global variable to provide the bus operations. Fix
this by making that variable a pointer and having the bus drivers set the
operations prior to registering.

This is not a particularly good or nice approach but it avoids blocking
multiplatform and a real fix involves fixing the fairly deep problems
with AC'97 support - we should be converting it to a real bus.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/sound/soc/txx9/txx9aclc-ac97.c b/sound/soc/txx9/txx9aclc-ac97.c
index 8ee8d4220014..4bcce8a3cded 100644
--- a/sound/soc/txx9/txx9aclc-ac97.c
+++ b/sound/soc/txx9/txx9aclc-ac97.c
@@ -119,12 +119,11 @@ static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97)
 }
 
 /* AC97 controller operations */
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops txx9aclc_ac97_ops = {
         .read           = txx9aclc_ac97_read,
         .write          = txx9aclc_ac97_write,
         .reset          = txx9aclc_ac97_cold_reset,
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
 
 static irqreturn_t txx9aclc_ac97_irq(int irq, void *dev_id)
 {
@@ -206,6 +205,10 @@ static int txx9aclc_ac97_dev_probe(struct platform_device *pdev)
         if (err < 0)
                 return err;
 
+        err = snd_soc_set_ac97_ops(&txx9aclc_ac97_ops);
+        if (err < 0)
+                return err;
+
         return snd_soc_register_component(&pdev->dev, &txx9aclc_ac97_component,
                                           &txx9aclc_ac97_dai, 1);
 }
@@ -213,6 +216,7 @@ static int txx9aclc_ac97_dev_probe(struct platform_device *pdev)
 static int txx9aclc_ac97_dev_remove(struct platform_device *pdev)
 {
         snd_soc_unregister_component(&pdev->dev);
+        snd_soc_set_ac97_ops(NULL);
         return 0;
 }