ASoC: core: Add support for DAI and machine kcontrols.

Currently ASoC can only add kcontrols using codec and platform component device
handles. It's also desirable to add kcontrols for DAIs (i.e. McBSP) and for
SoC card machine drivers too. This allows the kcontrol to have a direct handle to
the parent ASoC component DAI/SoC Card/Platform/Codec device and hence easily
get it's private data.

This change makes snd_soc_add_controls() static and wraps it in the folowing
calls (card and dai are new) :-

snd_soc_add_card_controls()
snd_soc_add_codec_controls()
snd_soc_add_dai_controls()
snd_soc_add_platform_controls()

This patch also does a lot of small mechanical changes in individual codec drivers
to replace snd_soc_add_controls() with snd_soc_add_codec_controls().

It also updates the McBSP DAI driver to use snd_soc_add_dai_controls().

Finally, it updates the existing machine drivers that register controls to either :-

1) Use snd_soc_add_card_controls() where no direct codec control is required.
2) Use snd_soc_add_codec_controls() where there is direct codec control.

In the case of 1) above we also update the machine drivers to get the correct
component data pointers from the kcontrol (rather than getting the machine pointer
via the codec pointer).

Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 70 insertions, 38 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 091d5f37ae64..a3a47cdaac8f 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -996,7 +996,7 @@ static int soc_probe_codec(struct snd_soc_card *card,
         }
 
         if (driver->controls)
-                snd_soc_add_controls(codec, driver->controls,
+                snd_soc_add_codec_controls(codec, driver->controls,
                                      driver->num_controls);
         if (driver->dapm_routes)
                 snd_soc_dapm_add_routes(&codec->dapm, driver->dapm_routes,
@@ -1457,13 +1457,8 @@ static void snd_soc_instantiate_card(struct snd_soc_card *card)
                 }
         }
 
-        /* We should have a non-codec control add function but we don't */
         if (card->controls)
-                snd_soc_add_controls(list_first_entry(&card->codec_dev_list,
-                                                      struct snd_soc_codec,
-                                                      card_list),
-                                     card->controls,
-                                     card->num_controls);
+                snd_soc_add_card_controls(card, card->controls, card->num_controls);
 
         if (card->dapm_routes)
                 snd_soc_dapm_add_routes(&card->dapm, card->dapm_routes,
@@ -2015,9 +2010,28 @@ struct snd_kcontrol *snd_soc_cnew(const struct snd_kcontrol_new *_template,
 }
 EXPORT_SYMBOL_GPL(snd_soc_cnew);
 
+static int snd_soc_add_controls(struct snd_card *card, struct device *dev,
+        const struct snd_kcontrol_new *controls, int num_controls,
+        const char *prefix, void *data)
+{
+        int err, i;
+
+        for (i = 0; i < num_controls; i++) {
+                const struct snd_kcontrol_new *control = &controls[i];
+                err = snd_ctl_add(card, snd_soc_cnew(control, data,
+                                                     control->name, prefix));
+                if (err < 0) {
+                        dev_err(dev, "Failed to add %s: %d\n", control->name, err);
+                        return err;
+                }
+        }
+
+        return 0;
+}
+
 /**
- * snd_soc_add_controls - add an array of controls to a codec.
- * Convienience function to add a list of controls. Many codecs were
+ * snd_soc_add_codec_controls - add an array of controls to a codec.
+ * Convenience function to add a list of controls. Many codecs were
  * duplicating this code.
  *
  * @codec: codec to add controls to
@@ -2026,31 +2040,19 @@ EXPORT_SYMBOL_GPL(snd_soc_cnew);
  *
  * Return 0 for success, else error.
  */
-int snd_soc_add_controls(struct snd_soc_codec *codec,
+int snd_soc_add_codec_controls(struct snd_soc_codec *codec,
         const struct snd_kcontrol_new *controls, int num_controls)
 {
         struct snd_card *card = codec->card->snd_card;
-        int err, i;
 
-        for (i = 0; i < num_controls; i++) {
-                const struct snd_kcontrol_new *control = &controls[i];
-                err = snd_ctl_add(card, snd_soc_cnew(control, codec,
-                                                     control->name,
-                                                     codec->name_prefix));
-                if (err < 0) {
-                        dev_err(codec->dev, "%s: Failed to add %s: %d\n",
-                                codec->name, control->name, err);
-                        return err;
-                }
-        }
-
-        return 0;
+        return snd_soc_add_controls(card, codec->dev, controls, num_controls,
+                        codec->name_prefix, codec);
 }
-EXPORT_SYMBOL_GPL(snd_soc_add_controls);
+EXPORT_SYMBOL_GPL(snd_soc_add_codec_controls);
 
 /**
  * snd_soc_add_platform_controls - add an array of controls to a platform.
- * Convienience function to add a list of controls.
+ * Convenience function to add a list of controls.
  *
  * @platform: platform to add controls to
  * @controls: array of controls to add
@@ -2062,23 +2064,53 @@ int snd_soc_add_platform_controls(struct snd_soc_platform *platform,
         const struct snd_kcontrol_new *controls, int num_controls)
 {
         struct snd_card *card = platform->card->snd_card;
-        int err, i;
 
-        for (i = 0; i < num_controls; i++) {
-                const struct snd_kcontrol_new *control = &controls[i];
-                err = snd_ctl_add(card, snd_soc_cnew(control, platform,
-                                control->name, NULL));
-                if (err < 0) {
-                        dev_err(platform->dev, "Failed to add %s %d\n",control->name, err);
-                        return err;
-                }
-        }
-
-        return 0;
+        return snd_soc_add_controls(card, platform->dev, controls, num_controls,
+                        NULL, platform);
 }
 EXPORT_SYMBOL_GPL(snd_soc_add_platform_controls);
 
 /**
+ * snd_soc_add_card_controls - add an array of controls to a SoC card.
+ * Convenience function to add a list of controls.
+ *
+ * @soc_card: SoC card to add controls to
+ * @controls: array of controls to add
+ * @num_controls: number of elements in the array
+ *
+ * Return 0 for success, else error.
+ */
+int snd_soc_add_card_controls(struct snd_soc_card *soc_card,
+        const struct snd_kcontrol_new *controls, int num_controls)
+{
+        struct snd_card *card = soc_card->snd_card;
+
+        return snd_soc_add_controls(card, soc_card->dev, controls, num_controls,
+                        NULL, soc_card);
+}
+EXPORT_SYMBOL_GPL(snd_soc_add_card_controls);
+
+/**
+ * snd_soc_add_dai_controls - add an array of controls to a DAI.
+ * Convienience function to add a list of controls.
+ *
+ * @dai: DAI to add controls to
+ * @controls: array of controls to add
+ * @num_controls: number of elements in the array
+ *
+ * Return 0 for success, else error.
+ */
+int snd_soc_add_dai_controls(struct snd_soc_dai *dai,
+        const struct snd_kcontrol_new *controls, int num_controls)
+{
+        struct snd_card *card = dai->card->snd_card;
+
+        return snd_soc_add_controls(card, dai->dev, controls, num_controls,
+                        NULL, dai);
+}
+EXPORT_SYMBOL_GPL(snd_soc_add_dai_controls);
+
+/**
  * snd_soc_info_enum_double - enumerated double mixer info callback
  * @kcontrol: mixer control
  * @uinfo: control element information