[alsa-devel] [PATCH] ASoC: wm_adsp: Expose mixer control API

[David Rhodes]

From: Li Xu <li.xu at cirrus.com>

Expose mixer control API for reading and writing.
The exposed API can be used by codec driver for
interacting with mixer control in kernel space.
This allows codec driver to implement more involved
interactions with DSP firmware, such as Fast Use
Case Switching.

Signed-off-by: Li Xu <li.xu at cirrus.com>
Signed-off-by: David Rhodes <david.rhodes at cirrus.com>
---
 sound/soc/codecs/wm_adsp.c | 70 +++++++++++++++++++++++++++++++++++++++++++++-
 sound/soc/codecs/wm_adsp.h |  4 +++
 2 files changed, 73 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index aa74fd1..77b8aea 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -635,6 +635,9 @@ struct wm_coeff_ctl_ops {
 struct wm_coeff_ctl {
 	const char *name;
 	const char *fw_name;
+	/* Subname is needed to match with firmware */
+	const char *subname;
+	unsigned int subname_len;
 	struct wm_adsp_alg_region alg_region;
 	struct wm_coeff_ctl_ops ops;
 	struct wm_adsp *dsp;
@@ -1520,6 +1523,7 @@ static void wm_adsp_free_ctl_blk(struct wm_coeff_ctl *ctl)
 {
 	kfree(ctl->cache);
 	kfree(ctl->name);
+	kfree(ctl->subname);
 	kfree(ctl);
 }
 
@@ -1597,6 +1601,15 @@ static int wm_adsp_create_control(struct wm_adsp *dsp,
 		ret = -ENOMEM;
 		goto err_ctl;
 	}
+	if (subname) {
+		ctl->subname_len = subname_len;
+		ctl->subname = kmemdup(subname,
+				       strlen(subname) + 1, GFP_KERNEL);
+		if (!ctl->subname) {
+			ret = -ENOMEM;
+			goto err_ctl_name;
+		}
+	}
 	ctl->enabled = 1;
 	ctl->set = 0;
 	ctl->ops.xget = wm_coeff_get;
@@ -1610,7 +1623,7 @@ static int wm_adsp_create_control(struct wm_adsp *dsp,
 	ctl->cache = kzalloc(ctl->len, GFP_KERNEL);
 	if (!ctl->cache) {
 		ret = -ENOMEM;
-		goto err_ctl_name;
+		goto err_ctl_subname;
 	}
 
 	list_add(&ctl->list, &dsp->ctl_list);
@@ -1633,6 +1646,8 @@ static int wm_adsp_create_control(struct wm_adsp *dsp,
 
 err_ctl_cache:
 	kfree(ctl->cache);
+err_ctl_subname:
+	kfree(ctl->subname);
 err_ctl_name:
 	kfree(ctl->name);
 err_ctl:
@@ -2194,6 +2209,59 @@ static int wm_adsp_load(struct wm_adsp *dsp)
 	return ret;
 }
 
+/*
+ * Find wm_coeff_ctl with input name as its subname
+ * If not found, return NULL
+ */
+static struct wm_coeff_ctl *wm_adsp_get_ctl(struct wm_adsp *dsp,
+					     const char *name)
+{
+	struct wm_coeff_ctl *pos, *rslt = NULL;
+
+	list_for_each_entry(pos, &dsp->ctl_list, list) {
+		if (!pos->subname)
+			continue;
+		if (strncmp(pos->subname, name, pos->subname_len) == 0) {
+			rslt = pos;
+			break;
+		}
+	}
+
+	return rslt;
+}
+
+int wm_adsp_write_ctl(struct wm_adsp *dsp, const char *name, const void *buf,
+		      size_t len)
+{
+	struct wm_coeff_ctl *ctl;
+
+	ctl = wm_adsp_get_ctl(dsp, name);
+	if (!ctl)
+		return -EINVAL;
+
+	if (len > ctl->len)
+		return -EINVAL;
+
+	return wm_coeff_write_control(ctl, buf, len);
+}
+EXPORT_SYMBOL_GPL(wm_adsp_write_ctl);
+
+int wm_adsp_read_ctl(struct wm_adsp *dsp, const char *name, void *buf,
+		     size_t len)
+{
+	struct wm_coeff_ctl *ctl;
+
+	ctl = wm_adsp_get_ctl(dsp, name);
+	if (!ctl)
+		return -EINVAL;
+
+	if (len > ctl->len)
+		return -EINVAL;
+
+	return wm_coeff_read_control(ctl, buf, len);
+}
+EXPORT_SYMBOL_GPL(wm_adsp_read_ctl);
+
 static void wm_adsp_ctl_fixup_base(struct wm_adsp *dsp,
 				  const struct wm_adsp_alg_region *alg_region)
 {
diff --git a/sound/soc/codecs/wm_adsp.h b/sound/soc/codecs/wm_adsp.h
index 5275a49..2a8cd09 100644
--- a/sound/soc/codecs/wm_adsp.h
+++ b/sound/soc/codecs/wm_adsp.h
@@ -223,5 +223,9 @@ int wm_adsp_compr_pointer(struct snd_compr_stream *stream,
 			  struct snd_compr_tstamp *tstamp);
 int wm_adsp_compr_copy(struct snd_compr_stream *stream,
 		       char __user *buf, size_t count);
+int wm_adsp_write_ctl(struct wm_adsp *dsp, const char *name, const void *buf,
+		      size_t len);
+int wm_adsp_read_ctl(struct wm_adsp *dsp, const char *name, void *buf,
+		     size_t len);
 
 #endif
-- 
1.9.1