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>

19 files changed, 151 insertions, 71 deletions

diff --git a/sound/soc/au1x/ac97c.c b/sound/soc/au1x/ac97c.c
index a51dabe20cbb..d6f7694fcad4 100644
--- a/sound/soc/au1x/ac97c.c
+++ b/sound/soc/au1x/ac97c.c
@@ -179,13 +179,12 @@ static void au1xac97c_ac97_cold_reset(struct snd_ac97 *ac97)
 }
 
 /* AC97 controller operations */
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops ac97c_bus_ops = {
         .read           = au1xac97c_ac97_read,
         .write          = au1xac97c_ac97_write,
         .reset          = au1xac97c_ac97_cold_reset,
         .warm_reset     = au1xac97c_ac97_warm_reset,
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);        /* globals be gone! */
 
 static int alchemy_ac97c_startup(struct snd_pcm_substream *substream,
                                  struct snd_soc_dai *dai)
@@ -272,6 +271,10 @@ static int au1xac97c_drvprobe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, ctx);
 
+        ret = snd_soc_set_ac97_ops(&ac97c_bus_ops);
+        if (ret)
+                return ret;
+
         ret = snd_soc_register_component(&pdev->dev, &au1xac97c_component,
                                          &au1xac97c_dai_driver, 1);
         if (ret)
diff --git a/sound/soc/au1x/psc-ac97.c b/sound/soc/au1x/psc-ac97.c
index a97ba1367b69..a822ab822bb7 100644
--- a/sound/soc/au1x/psc-ac97.c
+++ b/sound/soc/au1x/psc-ac97.c
@@ -201,13 +201,12 @@ static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97)
 }
 
 /* AC97 controller operations */
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops psc_ac97_ops = {
         .read           = au1xpsc_ac97_read,
         .write          = au1xpsc_ac97_write,
         .reset          = au1xpsc_ac97_cold_reset,
         .warm_reset     = au1xpsc_ac97_warm_reset,
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
 
 static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
                                   struct snd_pcm_hw_params *params,
@@ -417,6 +416,10 @@ static int au1xpsc_ac97_drvprobe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, wd);
 
+        ret = snd_soc_set_ac97_ops(&psc_ac97_ops);
+        if (ret)
+                return ret;
+
         ret = snd_soc_register_component(&pdev->dev, &au1xpsc_ac97_component,
                                          &wd->dai_drv, 1);
         if (ret)
diff --git a/sound/soc/blackfin/bf5xx-ac97.c b/sound/soc/blackfin/bf5xx-ac97.c
index 024e2dbe6c7f..c5af677ba49c 100644
--- a/sound/soc/blackfin/bf5xx-ac97.c
+++ b/sound/soc/blackfin/bf5xx-ac97.c
@@ -198,13 +198,12 @@ static void bf5xx_ac97_cold_reset(struct snd_ac97 *ac97)
 #endif
 }
 
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops bf5xx_ac97_ops = {
         .read   = bf5xx_ac97_read,
         .write  = bf5xx_ac97_write,
         .warm_reset     = bf5xx_ac97_warm_reset,
         .reset  = bf5xx_ac97_cold_reset,
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
 
 #ifdef CONFIG_PM
 static int bf5xx_ac97_suspend(struct snd_soc_dai *dai)
@@ -336,6 +335,12 @@ static int asoc_bfin_ac97_probe(struct platform_device *pdev)
                 goto sport_config_err;
         }
 
+        ret = snd_soc_set_ac97_ops(&bf5xx_ac97_ops);
+        if (ret != 0) {
+                dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret);
+                goto sport_config_err;
+        }
+
         ret = snd_soc_register_component(&pdev->dev, &bfin_ac97_component,
                                          &bfin_ac97_dai, 1);
         if (ret) {
@@ -350,6 +355,7 @@ static int asoc_bfin_ac97_probe(struct platform_device *pdev)
 sport_config_err:
         sport_done(sport_handle);
 sport_err:
+        snd_soc_set_ac97_ops(NULL);
 
         return ret;
 }
@@ -360,6 +366,7 @@ static int asoc_bfin_ac97_remove(struct platform_device *pdev)
 
         snd_soc_unregister_component(&pdev->dev);
         sport_done(sport_handle);
+        snd_soc_set_ac97_ops(NULL);
 
         return 0;
 }
diff --git a/sound/soc/cirrus/ep93xx-ac97.c b/sound/soc/cirrus/ep93xx-ac97.c
index d49e0556e381..4bc9490e2c84 100644
--- a/sound/soc/cirrus/ep93xx-ac97.c
+++ b/sound/soc/cirrus/ep93xx-ac97.c
@@ -237,13 +237,12 @@ static irqreturn_t ep93xx_ac97_interrupt(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops ep93xx_ac97_ops = {
         .read           = ep93xx_ac97_read,
         .write          = ep93xx_ac97_write,
         .reset          = ep93xx_ac97_cold_reset,
         .warm_reset     = ep93xx_ac97_warm_reset,
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
 
 static int ep93xx_ac97_trigger(struct snd_pcm_substream *substream,
                                int cmd, struct snd_soc_dai *dai)
@@ -395,6 +394,10 @@ static int ep93xx_ac97_probe(struct platform_device *pdev)
         ep93xx_ac97_info = info;
         platform_set_drvdata(pdev, info);
 
+        ret = snd_soc_set_ac97_ops(&ep93xx_ac97_ops);
+        if (ret)
+                goto fail;
+
         ret = snd_soc_register_component(&pdev->dev, &ep93xx_ac97_component,
                                          &ep93xx_ac97_dai, 1);
         if (ret)
@@ -405,6 +408,7 @@ static int ep93xx_ac97_probe(struct platform_device *pdev)
 fail:
         platform_set_drvdata(pdev, NULL);
         ep93xx_ac97_info = NULL;
+        snd_soc_set_ac97_ops(NULL);
         return ret;
 }
 
@@ -420,6 +424,8 @@ static int ep93xx_ac97_remove(struct platform_device *pdev)
         platform_set_drvdata(pdev, NULL);
         ep93xx_ac97_info = NULL;
 
+        snd_soc_set_ac97_ops(NULL);
+
         return 0;
 }
 
diff --git a/sound/soc/codecs/ac97.c b/sound/soc/codecs/ac97.c
index ef2ae32ffc66..ec7351803c24 100644
--- a/sound/soc/codecs/ac97.c
+++ b/sound/soc/codecs/ac97.c
@@ -62,13 +62,13 @@ static struct snd_soc_dai_driver ac97_dai = {
 static unsigned int ac97_read(struct snd_soc_codec *codec,
         unsigned int reg)
 {
-        return soc_ac97_ops.read(codec->ac97, reg);
+        return soc_ac97_ops->read(codec->ac97, reg);
 }
 
 static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
         unsigned int val)
 {
-        soc_ac97_ops.write(codec->ac97, reg, val);
+        soc_ac97_ops->write(codec->ac97, reg, val);
         return 0;
 }
 
@@ -79,7 +79,8 @@ static int ac97_soc_probe(struct snd_soc_codec *codec)
         int ret;
 
         /* add codec as bus device for standard ac97 */
-        ret = snd_ac97_bus(codec->card->snd_card, 0, &soc_ac97_ops, NULL, &ac97_bus);
+        ret = snd_ac97_bus(codec->card->snd_card, 0, soc_ac97_ops, NULL,
+                           &ac97_bus);
         if (ret < 0)
                 return ret;
 
diff --git a/sound/soc/codecs/ad1980.c b/sound/soc/codecs/ad1980.c
index f385342947d3..89fcf7d6e7b8 100644
--- a/sound/soc/codecs/ad1980.c
+++ b/sound/soc/codecs/ad1980.c
@@ -108,7 +108,7 @@ static unsigned int ac97_read(struct snd_soc_codec *codec,
         case AC97_EXTENDED_STATUS:
         case AC97_VENDOR_ID1:
         case AC97_VENDOR_ID2:
-                return soc_ac97_ops.read(codec->ac97, reg);
+                return soc_ac97_ops->read(codec->ac97, reg);
         default:
                 reg = reg >> 1;
 
@@ -124,7 +124,7 @@ static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
 {
         u16 *cache = codec->reg_cache;
 
-        soc_ac97_ops.write(codec->ac97, reg, val);
+        soc_ac97_ops->write(codec->ac97, reg, val);
         reg = reg >> 1;
         if (reg < ARRAY_SIZE(ad1980_reg))
                 cache[reg] = val;
@@ -154,13 +154,13 @@ static int ad1980_reset(struct snd_soc_codec *codec, int try_warm)
         u16 retry_cnt = 0;
 
 retry:
-        if (try_warm && soc_ac97_ops.warm_reset) {
-                soc_ac97_ops.warm_reset(codec->ac97);
+        if (try_warm && soc_ac97_ops->warm_reset) {
+                soc_ac97_ops->warm_reset(codec->ac97);
                 if (ac97_read(codec, AC97_RESET) == 0x0090)
                         return 1;
         }
 
-        soc_ac97_ops.reset(codec->ac97);
+        soc_ac97_ops->reset(codec->ac97);
         /* Set bit 16slot in register 74h, then every slot will has only 16
          * bits. This command is sent out in 20bit mode, in which case the
          * first nibble of data is eaten by the addr. (Tag is always 16 bit)*/
@@ -186,7 +186,7 @@ static int ad1980_soc_probe(struct snd_soc_codec *codec)
 
         printk(KERN_INFO "AD1980 SoC Audio Codec\n");
 
-        ret = snd_soc_new_ac97_codec(codec, &soc_ac97_ops, 0);
+        ret = snd_soc_new_ac97_codec(codec, soc_ac97_ops, 0);
         if (ret < 0) {
                 printk(KERN_ERR "ad1980: failed to register AC97 codec\n");
                 return ret;
diff --git a/sound/soc/codecs/stac9766.c b/sound/soc/codecs/stac9766.c
index cbc7ae322324..a5455c1aea42 100644
--- a/sound/soc/codecs/stac9766.c
+++ b/sound/soc/codecs/stac9766.c
@@ -143,14 +143,14 @@ static int stac9766_ac97_write(struct snd_soc_codec *codec, unsigned int reg,
 
         if (reg > AC97_STAC_PAGE0) {
                 stac9766_ac97_write(codec, AC97_INT_PAGING, 0);
-                soc_ac97_ops.write(codec->ac97, reg, val);
+                soc_ac97_ops->write(codec->ac97, reg, val);
                 stac9766_ac97_write(codec, AC97_INT_PAGING, 1);
                 return 0;
         }
         if (reg / 2 >= ARRAY_SIZE(stac9766_reg))
                 return -EIO;
 
-        soc_ac97_ops.write(codec->ac97, reg, val);
+        soc_ac97_ops->write(codec->ac97, reg, val);
         cache[reg / 2] = val;
         return 0;
 }
@@ -162,7 +162,7 @@ static unsigned int stac9766_ac97_read(struct snd_soc_codec *codec,
 
         if (reg > AC97_STAC_PAGE0) {
                 stac9766_ac97_write(codec, AC97_INT_PAGING, 0);
-                val = soc_ac97_ops.read(codec->ac97, reg - AC97_STAC_PAGE0);
+                val = soc_ac97_ops->read(codec->ac97, reg - AC97_STAC_PAGE0);
                 stac9766_ac97_write(codec, AC97_INT_PAGING, 1);
                 return val;
         }
@@ -173,7 +173,7 @@ static unsigned int stac9766_ac97_read(struct snd_soc_codec *codec,
                 reg == AC97_INT_PAGING || reg == AC97_VENDOR_ID1 ||
                 reg == AC97_VENDOR_ID2) {
 
-                val = soc_ac97_ops.read(codec->ac97, reg);
+                val = soc_ac97_ops->read(codec->ac97, reg);
                 return val;
         }
         return cache[reg / 2];
@@ -240,15 +240,15 @@ static int stac9766_set_bias_level(struct snd_soc_codec *codec,
 
 static int stac9766_reset(struct snd_soc_codec *codec, int try_warm)
 {
-        if (try_warm && soc_ac97_ops.warm_reset) {
-                soc_ac97_ops.warm_reset(codec->ac97);
+        if (try_warm && soc_ac97_ops->warm_reset) {
+                soc_ac97_ops->warm_reset(codec->ac97);
                 if (stac9766_ac97_read(codec, 0) == stac9766_reg[0])
                         return 1;
         }
 
-        soc_ac97_ops.reset(codec->ac97);
-        if (soc_ac97_ops.warm_reset)
-                soc_ac97_ops.warm_reset(codec->ac97);
+        soc_ac97_ops->reset(codec->ac97);
+        if (soc_ac97_ops->warm_reset)
+                soc_ac97_ops->warm_reset(codec->ac97);
         if (stac9766_ac97_read(codec, 0) != stac9766_reg[0])
                 return -EIO;
         return 0;
@@ -272,7 +272,7 @@ reset:
                 return -EIO;
         }
         codec->ac97->bus->ops->warm_reset(codec->ac97);
-        id = soc_ac97_ops.read(codec->ac97, AC97_VENDOR_ID2);
+        id = soc_ac97_ops->read(codec->ac97, AC97_VENDOR_ID2);
         if (id != 0x4c13) {
                 stac9766_reset(codec, 0);
                 reset++;
@@ -336,7 +336,7 @@ static int stac9766_codec_probe(struct snd_soc_codec *codec)
 {
         int ret = 0;
 
-        ret = snd_soc_new_ac97_codec(codec, &soc_ac97_ops, 0);
+        ret = snd_soc_new_ac97_codec(codec, soc_ac97_ops, 0);
         if (ret < 0)
                 goto codec_err;
 
diff --git a/sound/soc/codecs/wm9705.c b/sound/soc/codecs/wm9705.c
index a5fc61dbcd47..70ce6793c5bd 100644
--- a/sound/soc/codecs/wm9705.c
+++ b/sound/soc/codecs/wm9705.c
@@ -209,7 +209,7 @@ static unsigned int ac97_read(struct snd_soc_codec *codec, unsigned int reg)
         case AC97_RESET:
         case AC97_VENDOR_ID1:
         case AC97_VENDOR_ID2:
-                return soc_ac97_ops.read(codec->ac97, reg);
+                return soc_ac97_ops->read(codec->ac97, reg);
         default:
                 reg = reg >> 1;
 
@@ -225,7 +225,7 @@ static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
 {
         u16 *cache = codec->reg_cache;
 
-        soc_ac97_ops.write(codec->ac97, reg, val);
+        soc_ac97_ops->write(codec->ac97, reg, val);
         reg = reg >> 1;
         if (reg < (ARRAY_SIZE(wm9705_reg)))
                 cache[reg] = val;
@@ -294,8 +294,8 @@ static struct snd_soc_dai_driver wm9705_dai[] = {
 
 static int wm9705_reset(struct snd_soc_codec *codec)
 {
-        if (soc_ac97_ops.reset) {
-                soc_ac97_ops.reset(codec->ac97);
+        if (soc_ac97_ops->reset) {
+                soc_ac97_ops->reset(codec->ac97);
                 if (ac97_read(codec, 0) == wm9705_reg[0])
                         return 0; /* Success */
         }
@@ -306,7 +306,7 @@ static int wm9705_reset(struct snd_soc_codec *codec)
 #ifdef CONFIG_PM
 static int wm9705_soc_suspend(struct snd_soc_codec *codec)
 {
-        soc_ac97_ops.write(codec->ac97, AC97_POWERDOWN, 0xffff);
+        soc_ac97_ops->write(codec->ac97, AC97_POWERDOWN, 0xffff);
 
         return 0;
 }
@@ -323,7 +323,7 @@ static int wm9705_soc_resume(struct snd_soc_codec *codec)
         }
 
         for (i = 2; i < ARRAY_SIZE(wm9705_reg) << 1; i += 2) {
-                soc_ac97_ops.write(codec->ac97, i, cache[i>>1]);
+                soc_ac97_ops->write(codec->ac97, i, cache[i>>1]);
         }
 
         return 0;
@@ -337,7 +337,7 @@ static int wm9705_soc_probe(struct snd_soc_codec *codec)
 {
         int ret = 0;
 
-        ret = snd_soc_new_ac97_codec(codec, &soc_ac97_ops, 0);
+        ret = snd_soc_new_ac97_codec(codec, soc_ac97_ops, 0);
         if (ret < 0) {
                 printk(KERN_ERR "wm9705: failed to register AC97 codec\n");
                 return ret;
diff --git a/sound/soc/codecs/wm9712.c b/sound/soc/codecs/wm9712.c
index 8e9a6a3eeb1a..c5eb746087b4 100644
--- a/sound/soc/codecs/wm9712.c
+++ b/sound/soc/codecs/wm9712.c
@@ -455,7 +455,7 @@ static unsigned int ac97_read(struct snd_soc_codec *codec,
         if (reg == AC97_RESET || reg == AC97_GPIO_STATUS ||
                 reg == AC97_VENDOR_ID1 || reg == AC97_VENDOR_ID2 ||
                 reg == AC97_REC_GAIN)
-                return soc_ac97_ops.read(codec->ac97, reg);
+                return soc_ac97_ops->read(codec->ac97, reg);
         else {
                 reg = reg >> 1;
 
@@ -472,7 +472,7 @@ static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
         u16 *cache = codec->reg_cache;
 
         if (reg < 0x7c)
-                soc_ac97_ops.write(codec->ac97, reg, val);
+                soc_ac97_ops->write(codec->ac97, reg, val);
         reg = reg >> 1;
         if (reg < (ARRAY_SIZE(wm9712_reg)))
                 cache[reg] = val;
@@ -581,15 +581,15 @@ static int wm9712_set_bias_level(struct snd_soc_codec *codec,
 
 static int wm9712_reset(struct snd_soc_codec *codec, int try_warm)
 {
-        if (try_warm && soc_ac97_ops.warm_reset) {
-                soc_ac97_ops.warm_reset(codec->ac97);
+        if (try_warm && soc_ac97_ops->warm_reset) {
+                soc_ac97_ops->warm_reset(codec->ac97);
                 if (ac97_read(codec, 0) == wm9712_reg[0])
                         return 1;
         }
 
-        soc_ac97_ops.reset(codec->ac97);
-        if (soc_ac97_ops.warm_reset)
-                soc_ac97_ops.warm_reset(codec->ac97);
+        soc_ac97_ops->reset(codec->ac97);
+        if (soc_ac97_ops->warm_reset)
+                soc_ac97_ops->warm_reset(codec->ac97);
         if (ac97_read(codec, 0) != wm9712_reg[0])
                 goto err;
         return 0;
@@ -624,7 +624,7 @@ static int wm9712_soc_resume(struct snd_soc_codec *codec)
                         if (i == AC97_INT_PAGING || i == AC97_POWERDOWN ||
                             (i > 0x58 && i != 0x5c))
                                 continue;
-                        soc_ac97_ops.write(codec->ac97, i, cache[i>>1]);
+                        soc_ac97_ops->write(codec->ac97, i, cache[i>>1]);
                 }
         }
 
@@ -635,7 +635,7 @@ static int wm9712_soc_probe(struct snd_soc_codec *codec)
 {
         int ret = 0;
 
-        ret = snd_soc_new_ac97_codec(codec, &soc_ac97_ops, 0);
+        ret = snd_soc_new_ac97_codec(codec, soc_ac97_ops, 0);
         if (ret < 0) {
                 printk(KERN_ERR "wm9712: failed to register AC97 codec\n");
                 return ret;
diff --git a/sound/soc/codecs/wm9713.c b/sound/soc/codecs/wm9713.c
index f7afa68d8c7f..a53e175c015a 100644
--- a/sound/soc/codecs/wm9713.c
+++ b/sound/soc/codecs/wm9713.c
@@ -652,7 +652,7 @@ static unsigned int ac97_read(struct snd_soc_codec *codec,
         if (reg == AC97_RESET || reg == AC97_GPIO_STATUS ||
                 reg == AC97_VENDOR_ID1 || reg == AC97_VENDOR_ID2 ||
                 reg == AC97_CD)
-                return soc_ac97_ops.read(codec->ac97, reg);
+                return soc_ac97_ops->read(codec->ac97, reg);
         else {
                 reg = reg >> 1;
 
@@ -668,7 +668,7 @@ static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
 {
         u16 *cache = codec->reg_cache;
         if (reg < 0x7c)
-                soc_ac97_ops.write(codec->ac97, reg, val);
+                soc_ac97_ops->write(codec->ac97, reg, val);
         reg = reg >> 1;
         if (reg < (ARRAY_SIZE(wm9713_reg)))
                 cache[reg] = val;
@@ -1095,15 +1095,15 @@ static struct snd_soc_dai_driver wm9713_dai[] = {
 
 int wm9713_reset(struct snd_soc_codec *codec, int try_warm)
 {
-        if (try_warm && soc_ac97_ops.warm_reset) {
-                soc_ac97_ops.warm_reset(codec->ac97);
+        if (try_warm && soc_ac97_ops->warm_reset) {
+                soc_ac97_ops->warm_reset(codec->ac97);
                 if (ac97_read(codec, 0) == wm9713_reg[0])
                         return 1;
         }
 
-        soc_ac97_ops.reset(codec->ac97);
-        if (soc_ac97_ops.warm_reset)
-                soc_ac97_ops.warm_reset(codec->ac97);
+        soc_ac97_ops->reset(codec->ac97);
+        if (soc_ac97_ops->warm_reset)
+                soc_ac97_ops->warm_reset(codec->ac97);
         if (ac97_read(codec, 0) != wm9713_reg[0])
                 return -EIO;
         return 0;
@@ -1180,7 +1180,7 @@ static int wm9713_soc_resume(struct snd_soc_codec *codec)
                         if (i == AC97_POWERDOWN || i == AC97_EXTENDED_MID ||
                                 i == AC97_EXTENDED_MSTATUS || i > 0x66)
                                 continue;
-                        soc_ac97_ops.write(codec->ac97, i, cache[i>>1]);
+                        soc_ac97_ops->write(codec->ac97, i, cache[i>>1]);
                 }
         }
 
@@ -1197,7 +1197,7 @@ static int wm9713_soc_probe(struct snd_soc_codec *codec)
                 return -ENOMEM;
         snd_soc_codec_set_drvdata(codec, wm9713);
 
-        ret = snd_soc_new_ac97_codec(codec, &soc_ac97_ops, 0);
+        ret = snd_soc_new_ac97_codec(codec, soc_ac97_ops, 0);
         if (ret < 0)
                 goto codec_err;
 
diff --git a/sound/soc/fsl/imx-ssi.c b/sound/soc/fsl/imx-ssi.c
index c6fa03e2114a..bd40849454a8 100644
--- a/sound/soc/fsl/imx-ssi.c
+++ b/sound/soc/fsl/imx-ssi.c
@@ -501,13 +501,12 @@ static void imx_ssi_ac97_warm_reset(struct snd_ac97 *ac97)
         imx_ssi_ac97_read(ac97, 0);
 }
 
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops imx_ssi_ac97_ops = {
         .read           = imx_ssi_ac97_read,
         .write          = imx_ssi_ac97_write,
         .reset          = imx_ssi_ac97_reset,
         .warm_reset     = imx_ssi_ac97_warm_reset
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
 
 static int imx_ssi_probe(struct platform_device *pdev)
 {
@@ -583,6 +582,12 @@ static int imx_ssi_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, ssi);
 
+        ret = snd_soc_set_ac97_ops(&imx_ssi_ac97_ops);
+        if (ret != 0) {
+                dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret);
+                goto failed_register;
+        }
+
         ret = snd_soc_register_component(&pdev->dev, &imx_component,
                                          dai, 1);
         if (ret) {
@@ -630,6 +635,7 @@ failed_register:
         release_mem_region(res->start, resource_size(res));
         clk_disable_unprepare(ssi->clk);
 failed_clk:
+        snd_soc_set_ac97_ops(NULL);
 
         return ret;
 }
@@ -649,6 +655,7 @@ static int imx_ssi_remove(struct platform_device *pdev)
 
         release_mem_region(res->start, resource_size(res));
         clk_disable_unprepare(ssi->clk);
+        snd_soc_set_ac97_ops(NULL);
 
         return 0;
 }
diff --git a/sound/soc/fsl/mpc5200_psc_ac97.c b/sound/soc/fsl/mpc5200_psc_ac97.c
index 4141b35ef0bb..3ef7a0c92efa 100644
--- a/sound/soc/fsl/mpc5200_psc_ac97.c
+++ b/sound/soc/fsl/mpc5200_psc_ac97.c
@@ -131,13 +131,12 @@ static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
         psc_ac97_warm_reset(ac97);
 }
 
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops psc_ac97_ops = {
         .read           = psc_ac97_read,
         .write          = psc_ac97_write,
         .reset          = psc_ac97_cold_reset,
         .warm_reset     = psc_ac97_warm_reset,
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
 
 static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
                                  struct snd_pcm_hw_params *params,
@@ -290,6 +289,12 @@ static int psc_ac97_of_probe(struct platform_device *op)
         if (rc != 0)
                 return rc;
 
+        rc = snd_soc_set_ac97_ops(&psc_ac97_ops);
+        if (rc != 0) {
+                dev_err(&op->dev, "Failed to set AC'97 ops: %d\n", ret);
+                return rc;
+        }
+
         rc = snd_soc_register_component(&op->dev, &psc_ac97_component,
                                         psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
         if (rc != 0) {
@@ -318,6 +323,7 @@ static int psc_ac97_of_remove(struct platform_device *op)
 {
         mpc5200_audio_dma_destroy(op);
         snd_soc_unregister_component(&op->dev);
+        snd_soc_set_ac97_ops(NULL);
         return 0;
 }
 
diff --git a/sound/soc/nuc900/nuc900-ac97.c b/sound/soc/nuc900/nuc900-ac97.c
index 8dea4c1fd997..f4c2417a8730 100644
--- a/sound/soc/nuc900/nuc900-ac97.c
+++ b/sound/soc/nuc900/nuc900-ac97.c
@@ -197,13 +197,12 @@ static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
 }
 
 /* AC97 controller operations */
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops nuc900_ac97_ops = {
         .read           = nuc900_ac97_read,
         .write          = nuc900_ac97_write,
         .reset          = nuc900_ac97_cold_reset,
         .warm_reset     = nuc900_ac97_warm_reset,
-}
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
+};
 
 static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
                                 int cmd, struct snd_soc_dai *dai)
@@ -356,6 +355,10 @@ static int nuc900_ac97_drvprobe(struct platform_device *pdev)
 
         nuc900_ac97_data = nuc900_audio;
 
+        ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops);
+        if (ret)
+                goto out;
+
         ret = snd_soc_register_component(&pdev->dev, &nuc900_ac97_component,
                                          &nuc900_ac97_dai, 1);
         if (ret)
@@ -367,6 +370,7 @@ static int nuc900_ac97_drvprobe(struct platform_device *pdev)
         return 0;
 
 out:
+        snd_soc_set_ac97_ops(NULL);
         return ret;
 }
 
@@ -375,6 +379,7 @@ static int nuc900_ac97_drvremove(struct platform_device *pdev)
         snd_soc_unregister_component(&pdev->dev);
 
         nuc900_ac97_data = NULL;
+        snd_soc_set_ac97_ops(NULL);
 
         return 0;
 }
diff --git a/sound/soc/pxa/pxa2xx-ac97.c b/sound/soc/pxa/pxa2xx-ac97.c
index 57ea8e6c5488..a3c22ba25f08 100644
--- a/sound/soc/pxa/pxa2xx-ac97.c
+++ b/sound/soc/pxa/pxa2xx-ac97.c
@@ -41,13 +41,12 @@ static void pxa2xx_ac97_cold_reset(struct snd_ac97 *ac97)
         pxa2xx_ac97_finish_reset(ac97);
 }
 
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
         .read   = pxa2xx_ac97_read,
         .write  = pxa2xx_ac97_write,
         .warm_reset     = pxa2xx_ac97_warm_reset,
         .reset  = pxa2xx_ac97_cold_reset,
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
 
 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_out = {
         .name                   = "AC97 PCM Stereo out",
@@ -244,6 +243,10 @@ static int pxa2xx_ac97_dev_probe(struct platform_device *pdev)
                 return -ENXIO;
         }
 
+        ret = snd_soc_set_ac97_ops(&pxa2xx_ac97_ops);
+        if (ret != 0)
+                return ret;
+
         /* Punt most of the init to the SoC probe; we may need the machine
          * driver to do interesting things with the clocking to get us up
          * and running.
@@ -255,6 +258,7 @@ static int pxa2xx_ac97_dev_probe(struct platform_device *pdev)
 static int pxa2xx_ac97_dev_remove(struct platform_device *pdev)
 {
         snd_soc_unregister_component(&pdev->dev);
+        snd_soc_set_ac97_ops(NULL);
         return 0;
 }
 
diff --git a/sound/soc/samsung/ac97.c b/sound/soc/samsung/ac97.c
index 04d7fd461484..2dd623fa3882 100644
--- a/sound/soc/samsung/ac97.c
+++ b/sound/soc/samsung/ac97.c
@@ -214,13 +214,12 @@ static irqreturn_t s3c_ac97_irq(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops s3c_ac97_ops = {
         .read       = s3c_ac97_read,
         .write      = s3c_ac97_write,
         .warm_reset = s3c_ac97_warm_reset,
         .reset      = s3c_ac97_cold_reset,
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
 
 static int s3c_ac97_hw_params(struct snd_pcm_substream *substream,
                                   struct snd_pcm_hw_params *params,
@@ -452,6 +451,12 @@ static int s3c_ac97_probe(struct platform_device *pdev)
                 goto err4;
         }
 
+        ret = snd_soc_set_ac97_ops(&s3c_ac97_ops);
+        if (ret != 0) {
+                dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret);
+                goto err4;
+        }
+
         ret = snd_soc_register_component(&pdev->dev, &s3c_ac97_component,
                                          s3c_ac97_dai, ARRAY_SIZE(s3c_ac97_dai));
         if (ret)
@@ -472,7 +477,7 @@ err4:
 err3:
         clk_disable_unprepare(s3c_ac97.ac97_clk);
 err2:
-
+        snd_soc_set_ac97_ops(NULL);
         return ret;
 }
 
@@ -488,6 +493,7 @@ static int s3c_ac97_remove(struct platform_device *pdev)
                 free_irq(irq_res->start, NULL);
 
         clk_disable_unprepare(s3c_ac97.ac97_clk);
+        snd_soc_set_ac97_ops(NULL);
 
         return 0;
 }
diff --git a/sound/soc/sh/hac.c b/sound/soc/sh/hac.c
index af19f77b7bf0..0af2e4dfd139 100644
--- a/sound/soc/sh/hac.c
+++ b/sound/soc/sh/hac.c
@@ -227,13 +227,12 @@ static void hac_ac97_coldrst(struct snd_ac97 *ac97)
         hac_ac97_warmrst(ac97);
 }
 
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops hac_ac97_ops = {
         .read   = hac_ac97_read,
         .write  = hac_ac97_write,
         .reset  = hac_ac97_coldrst,
         .warm_reset = hac_ac97_warmrst,
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
 
 static int hac_hw_params(struct snd_pcm_substream *substream,
                          struct snd_pcm_hw_params *params,
@@ -316,6 +315,10 @@ static const struct snd_soc_component_driver sh4_hac_component = {
 
 static int hac_soc_platform_probe(struct platform_device *pdev)
 {
+        ret = snd_soc_set_ac97_ops(&hac_ac97_ops);
+        if (ret != 0)
+                return ret;
+
         return snd_soc_register_component(&pdev->dev, &sh4_hac_component,
                                           sh4_hac_dai, ARRAY_SIZE(sh4_hac_dai));
 }
@@ -323,6 +326,7 @@ static int hac_soc_platform_probe(struct platform_device *pdev)
 static int hac_soc_platform_remove(struct platform_device *pdev)
 {
         snd_soc_unregister_component(&pdev->dev);
+        snd_soc_set_ac97_ops(NULL);
         return 0;
 }
 
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index d56bbea6e75e..562d72e04e6e 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -2079,6 +2079,22 @@ int snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
 }
 EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec);
 
+struct snd_ac97_bus_ops *soc_ac97_ops;
+
+int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops)
+{
+        if (ops == soc_ac97_ops)
+                return 0;
+
+        if (soc_ac97_ops && ops)
+                return -EBUSY;
+
+        soc_ac97_ops = ops;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_set_ac97_ops);
+
 /**
  * snd_soc_free_ac97_codec - free AC97 codec device
  * @codec: audio codec
diff --git a/sound/soc/tegra/tegra20_ac97.c b/sound/soc/tegra/tegra20_ac97.c
index 48037f784a86..f52eab6d2231 100644
--- a/sound/soc/tegra/tegra20_ac97.c
+++ b/sound/soc/tegra/tegra20_ac97.c
@@ -142,13 +142,12 @@ static void tegra20_ac97_codec_write(struct snd_ac97 *ac97_snd,
         } while (!time_after(jiffies, timeout));
 }
 
-struct snd_ac97_bus_ops soc_ac97_ops = {
+static struct snd_ac97_bus_ops tegra20_ac97_ops = {
         .read           = tegra20_ac97_codec_read,
         .write          = tegra20_ac97_codec_write,
         .reset          = tegra20_ac97_codec_reset,
         .warm_reset     = tegra20_ac97_codec_warm_reset,
 };
-EXPORT_SYMBOL_GPL(soc_ac97_ops);
 
 static inline void tegra20_ac97_start_playback(struct tegra20_ac97 *ac97)
 {
@@ -409,6 +408,12 @@ static int tegra20_ac97_platform_probe(struct platform_device *pdev)
                 goto err_asoc_utils_fini;
         }
 
+        ret = snd_soc_set_ac97_ops(&tegra20_ac97_ops);
+        if (ret) {
+                dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret);
+                goto err_asoc_utils_fini;
+        }
+
         ret = snd_soc_register_component(&pdev->dev, &tegra20_ac97_component,
                                          &tegra20_ac97_dai, 1);
         if (ret) {
@@ -436,6 +441,7 @@ err_asoc_utils_fini:
         tegra_asoc_utils_fini(&ac97->util_data);
 err_clk_put:
 err:
+        snd_soc_set_ac97_ops(NULL);
         return ret;
 }
 
@@ -450,6 +456,8 @@ static int tegra20_ac97_platform_remove(struct platform_device *pdev)
 
         clk_disable_unprepare(ac97->clk_ac97);
 
+        snd_soc_set_ac97_ops(NULL);
+
         return 0;
 }
 
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;
 }