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authorTakashi Iwai <tiwai@suse.de>2015-02-26 14:29:03 +0300
committerTakashi Iwai <tiwai@suse.de>2015-03-23 15:19:41 +0300
commit5e56bcea5017b7b7808df60f21ef01738b6e1a25 (patch)
treebf841e780837f867d8e842928440537e1eb465cc /sound
parentfaa75f8a2edf005a5caf43be4875ffeeb9bcb498 (diff)
downloadlinux-5e56bcea5017b7b7808df60f21ef01738b6e1a25.tar.xz
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>
Diffstat (limited to 'sound')
-rw-r--r--sound/hda/hdac_regmap.c28
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
*/