ALSA: Allow passing platform_data to devices attached to AC97 bus

This patch allows passing platform_data to devices attached to AC97 bus
(like touchscreens, battery measurement chips ...).

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 12 insertions, 1 deletions

diff --git a/include/sound/ac97_codec.h b/include/sound/ac97_codec.h
index 251fc1cd500..9b1c0985480 100644
--- a/include/sound/ac97_codec.h
+++ b/include/sound/ac97_codec.h
@@ -642,4 +642,10 @@ int snd_ac97_pcm_double_rate_rules(struct snd_pcm_runtime *runtime);
 /* ad hoc AC97 device driver access */
 extern struct bus_type ac97_bus_type;
 
+/* AC97 platform_data adding function */
+static inline void snd_ac97_dev_add_pdata(struct snd_ac97 *ac97, void *data)
+{
+        ac97->dev.platform_data = data;
+}
+
 #endif /* __SOUND_AC97_CODEC_H */
diff --git a/include/sound/soc-dai.h b/include/sound/soc-dai.h
index 05991b0925e..25d62ac53fc 100644
--- a/include/sound/soc-dai.h
+++ b/include/sound/soc-dai.h
@@ -179,6 +179,7 @@ struct snd_soc_dai {
         int ac97_control;
 
         struct device *dev;
+        void *ac97_pdata;       /* platform_data for the ac97 codec */
 
         /* DAI callbacks */
         int (*probe)(struct platform_device *pdev,
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 8bf49a4e664..5eabb711760 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -28,6 +28,7 @@
 #include <linux/bitops.h>
 #include <linux/debugfs.h>
 #include <linux/platform_device.h>
+#include <sound/ac97_codec.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -1461,8 +1462,11 @@ int snd_soc_init_card(struct snd_soc_device *socdev)
                                 continue;
                         }
                 }
-                if (card->dai_link[i].codec_dai->ac97_control)
+                if (card->dai_link[i].codec_dai->ac97_control) {
                         ac97 = 1;
+                        snd_ac97_dev_add_pdata(codec->ac97,
+                                card->dai_link[i].cpu_dai->ac97_pdata);
+                }
         }
         snprintf(codec->card->shortname, sizeof(codec->card->shortname),
                  "%s",  card->name);