ALSA: hda - Allow driver to add vendor-specific verbs for regmap

Codecs may have own vendor-specific verbs, and we need to allow each
driver to give such verbs for cached accesses.  Here a verb can be put
into a single array and looked through it at readable and writeable
callbacks.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 28 insertions, 0 deletions

diff --git a/sound/hda/hdac_regmap.c b/sound/hda/hdac_regmap.c
index 933907b16457..486ef720cbff 100644
--- a/sound/hda/hdac_regmap.c
+++ b/sound/hda/hdac_regmap.c
@@ -60,6 +60,13 @@ static bool hda_writeable_reg(struct device *dev, unsigned int reg)
 {
         struct hdac_device *codec = dev_to_hdac_dev(dev);
         unsigned int verb = get_verb(reg);
+        int i;
+
+        for (i = 0; i < codec->vendor_verbs.used; i++) {
+                unsigned int *v = snd_array_elem(&codec->vendor_verbs, i);
+                if (verb == *v)
+                        return true;
+        }
 
         if (codec->caps_overwriting)
                 return true;
@@ -200,6 +207,7 @@ int snd_hdac_regmap_init(struct hdac_device *codec)
         if (IS_ERR(regmap))
                 return PTR_ERR(regmap);
         codec->regmap = regmap;
+        snd_array_init(&codec->vendor_verbs, sizeof(unsigned int), 8);
         return 0;
 }
 EXPORT_SYMBOL_GPL(snd_hdac_regmap_init);
@@ -209,10 +217,30 @@ void snd_hdac_regmap_exit(struct hdac_device *codec)
         if (codec->regmap) {
                 regmap_exit(codec->regmap);
                 codec->regmap = NULL;
+                snd_array_free(&codec->vendor_verbs);
         }
 }
 EXPORT_SYMBOL_GPL(snd_hdac_regmap_exit);
 
+/**
+ * snd_hdac_regmap_add_vendor_verb - add a vendor-specific verb to regmap
+ * @codec: the codec object
+ * @verb: verb to allow accessing via regmap
+ *
+ * Returns zero for success or a negative error code.
+ */
+int snd_hdac_regmap_add_vendor_verb(struct hdac_device *codec,
+                                    unsigned int verb)
+{
+        unsigned int *p = snd_array_new(&codec->vendor_verbs);
+
+        if (!p)
+                return -ENOMEM;
+        *p = verb;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_regmap_add_vendor_verb);
+
 /*
  * helper functions
  */