[alsa-devel] [PATCH v2 3/4] ASoC: simple-card: accept many DAI links
Jean-Francois Moine
moinejf at free.fr
Tue Mar 11 10:36:10 CET 2014
Some simple audio cards may have many DAI links.
This patch extends the simple-card driver for handling such cards.
Signed-off-by: Jean-Francois Moine <moinejf at free.fr>
---
sound/soc/generic/simple-card.c | 132 ++++++++++++++++++++++++++--------------
1 file changed, 85 insertions(+), 47 deletions(-)
diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index 2710b52..8188c34 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -107,6 +107,9 @@ asoc_simple_card_sub_parse_of(struct device_node *np,
if (ret < 0)
return ret;
+ if (!dai)
+ return 0;
+
/* parse TDM slot */
ret = snd_soc_of_parse_tdm_slot(np, &dai->slots, &dai->slot_width);
if (ret)
@@ -154,7 +157,7 @@ static int asoc_simple_card_parse_of(struct device_node *node,
struct snd_soc_dai_link *dai_link = priv->snd_card.dai_link;
struct device_node *np;
char *name;
- int ret;
+ int first_link, ret;
/* parsing the card name from DT */
snd_soc_of_parse_card_name(&priv->snd_card, "simple-audio-card,name");
@@ -179,50 +182,67 @@ static int asoc_simple_card_parse_of(struct device_node *node,
return ret;
}
- /* CPU sub-node */
- ret = -EINVAL;
- np = of_get_child_by_name(node, "simple-audio-card,cpu");
- if (np) {
+ /* loop on the DAI links */
+ np = NULL;
+ first_link = 1;
+ for (;;) {
+ np = of_get_next_child(node, np);
+ if (!np)
+ break;
+
+ /* CPU sub-node */
+ if (strcmp(np->name, "simple-audio-card,cpu") != 0) {
+ dev_err(dev, "Bad CPU DAI\n");
+ ret = -EINVAL;
+ goto err;
+ }
ret = asoc_simple_card_sub_parse_of(np, priv->daifmt,
- &priv->cpu_dai,
+ first_link ? &priv->cpu_dai : NULL,
&dai_link->cpu_of_node,
&dai_link->cpu_dai_name);
- of_node_put(np);
- }
- if (ret < 0)
- return ret;
+ if (ret < 0)
+ goto err;
- /* CODEC sub-node */
- ret = -EINVAL;
- np = of_get_child_by_name(node, "simple-audio-card,codec");
- if (np) {
+ /* CODEC sub-node */
+ np = of_get_next_child(node, np);
+ if (strcmp(np->name, "simple-audio-card,codec") != 0) {
+ dev_err(dev, "Bad CODEC DAI\n");
+ ret = -EINVAL;
+ goto err;
+ }
ret = asoc_simple_card_sub_parse_of(np, priv->daifmt,
- &priv->codec_dai,
+ first_link ? &priv->codec_dai : NULL,
&dai_link->codec_of_node,
&dai_link->codec_dai_name);
- of_node_put(np);
- }
- if (ret < 0)
- return ret;
+ if (ret < 0)
+ goto err;
+
+ if (!dai_link->cpu_dai_name || !dai_link->codec_dai_name) {
+ ret = -EINVAL;
+ goto err;
+ }
- if (!dai_link->cpu_dai_name || !dai_link->codec_dai_name)
- return -EINVAL;
+ /* simple-card assumes platform == cpu */
+ dai_link->platform_of_node = dai_link->cpu_of_node;
+
+ name = devm_kzalloc(dev,
+ strlen(dai_link->cpu_dai_name) +
+ strlen(dai_link->codec_dai_name) + 2,
+ GFP_KERNEL);
+ sprintf(name, "%s-%s", dai_link->cpu_dai_name,
+ dai_link->codec_dai_name);
+ dai_link->name = dai_link->stream_name = name;
+
+ dai_link++;
+ first_link = 0;
+ }
/* card name is created from CPU/CODEC dai name */
- name = devm_kzalloc(dev,
- strlen(dai_link->cpu_dai_name) +
- strlen(dai_link->codec_dai_name) + 2,
- GFP_KERNEL);
- sprintf(name, "%s-%s", dai_link->cpu_dai_name,
- dai_link->codec_dai_name);
+ dai_link = priv->snd_card.dai_link;
if (!priv->snd_card.name)
- priv->snd_card.name = name;
- dai_link->name = dai_link->stream_name = name;
+ priv->snd_card.name = dai_link->name;
- /* simple-card assumes platform == cpu */
- dai_link->platform_of_node = dai_link->cpu_of_node;
-
- dev_dbg(dev, "card-name : %s\n", name);
+ dev_dbg(dev, "card-name : %s\n", priv->snd_card.name);
dev_dbg(dev, "platform : %04x\n", priv->daifmt);
dev_dbg(dev, "cpu : %s / %04x / %d\n",
dai_link->cpu_dai_name,
@@ -233,18 +253,11 @@ static int asoc_simple_card_parse_of(struct device_node *node,
priv->codec_dai.fmt,
priv->codec_dai.sysclk);
- /*
- * soc_bind_dai_link() will check cpu name
- * after of_node matching if dai_link has cpu_dai_name.
- * but, it will never match if name was created by fmt_single_name()
- * remove cpu_dai_name to escape name matching.
- * see
- * fmt_single_name()
- * fmt_multiple_name()
- */
- dai_link->cpu_dai_name = NULL;
-
return 0;
+
+err:
+ of_node_put(np);
+ return ret;
}
/* update the reference count of the devices nodes at end of probe */
@@ -274,10 +287,22 @@ static int asoc_simple_card_probe(struct platform_device *pdev)
struct snd_soc_dai_link *dai_link;
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
- int ret;
+ int num_links, ret;
+
+ /* get the number of DAI links */
+ if (np) {
+ num_links = of_get_child_count(np);
+ if (num_links == 0 || (num_links & 1)) {
+ dev_err(&pdev->dev, "Bad number of DAI links\n");
+ return -EINVAL;
+ }
+ num_links /= 2;
+ } else {
+ num_links = 1;
+ }
priv = devm_kzalloc(dev,
- sizeof(*priv) + sizeof(*dai_link),
+ sizeof(*priv) + sizeof(*dai_link) * num_links,
GFP_KERNEL);
if (!priv)
return -ENOMEM;
@@ -289,7 +314,7 @@ static int asoc_simple_card_probe(struct platform_device *pdev)
priv->snd_card.dev = dev;
dai_link = priv->dai_link;
priv->snd_card.dai_link = dai_link;
- priv->snd_card.num_links = 1;
+ priv->snd_card.num_links = num_links;
if (np && of_device_is_available(np)) {
@@ -299,6 +324,19 @@ static int asoc_simple_card_probe(struct platform_device *pdev)
dev_err(dev, "parse error %d\n", ret);
goto err;
}
+
+ /*
+ * soc_bind_dai_link() will check cpu name
+ * after of_node matching if dai_link has cpu_dai_name.
+ * but, it will never match if name was created by fmt_single_name()
+ * remove cpu_dai_name to escape name matching.
+ * see
+ * fmt_single_name()
+ * fmt_multiple_name()
+ */
+ if (num_links == 1)
+ dai_link->cpu_dai_name = NULL;
+
} else {
struct asoc_simple_card_info *cinfo;
--
1.9.0
More information about the Alsa-devel
mailing list