[PATCH 2/2] ALSA: hda - Add cache connection info

[Wang Xingchao <xingchao.wang@linux.intel.com>]

Pin's connection list may change dynamically with hot-plug event
on Intel Haswell chip. Users would see connections be "0" in codec#.
when play audio on this pin, software choose connections from cache.
So add Cache connection info to avoid confuse.

Signed-off-by: Wang Xingchao <xingchao.wang@linux.intel.com>
---
 sound/pci/hda/hda_codec.c | 13 +++++++++++++
 sound/pci/hda/hda_codec.h |  2 ++
 sound/pci/hda/hda_proc.c  | 13 ++++++++++++-
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 55108b5..7517fd6 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -354,6 +354,19 @@ lookup_conn_list(struct hda_codec *codec, hda_nid_t nid)
 	return NULL;
 }
 
+int lookup_cache_conn(struct hda_codec *codec,
+	       hda_nid_t pin_nid, hda_nid_t *conn_list)
+{
+	struct hda_conn_list *p;
+
+	p = lookup_conn_list(codec, pin_nid);
+	if (p) {
+		memcpy(conn_list, p->conns, p->len * sizeof(hda_nid_t));
+		return p->len;
+	}
+	return 0;
+}
+
 static int add_conn_list(struct hda_codec *codec, hda_nid_t nid, int len,
 			 const hda_nid_t *list)
 {
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index c93f902..145d184 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -963,6 +963,8 @@ snd_hda_get_num_conns(struct hda_codec *codec, hda_nid_t nid)
 int snd_hda_get_num_raw_conns(struct hda_codec *codec, hda_nid_t nid);
 int snd_hda_get_raw_connections(struct hda_codec *codec, hda_nid_t nid,
 			    hda_nid_t *conn_list, int max_conns);
+int lookup_cache_conn(struct hda_codec *codec,
+	       hda_nid_t pin_nid, hda_nid_t *conn_list);
 int snd_hda_get_conn_list(struct hda_codec *codec, hda_nid_t nid,
 			  const hda_nid_t **listp);
 int snd_hda_override_conn_list(struct hda_codec *codec, hda_nid_t nid, int nums,
diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index 0fee8fa..e52ad3c 100644
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -504,6 +504,7 @@ static void print_conn_list(struct snd_info_buffer *buffer,
 			    int conn_len)
 {
 	int c, curr = -1;
+	hda_nid_t cache_conn[4];
 
 	if (conn_len > 1 &&
 	    wid_type != AC_WID_AUD_MIX &&
@@ -511,7 +512,7 @@ static void print_conn_list(struct snd_info_buffer *buffer,
 	    wid_type != AC_WID_POWER)
 		curr = snd_hda_codec_read(codec, nid, 0,
 					  AC_VERB_GET_CONNECT_SEL, 0);
-	snd_iprintf(buffer, "  Connection: %d\n", conn_len);
+	snd_iprintf(buffer, "  Raw Connection: %d\n", conn_len);
 	if (conn_len > 0) {
 		snd_iprintf(buffer, "    ");
 		for (c = 0; c < conn_len; c++) {
@@ -521,6 +522,16 @@ static void print_conn_list(struct snd_info_buffer *buffer,
 		}
 		snd_iprintf(buffer, "\n");
 	}
+
+	/* Get Cache connections info */
+	conn_len = lookup_cache_conn(codec, nid, cache_conn);
+	if (conn_len > 0) {
+		snd_iprintf(buffer, "  Cache Connection: %d\n", conn_len);
+		snd_iprintf(buffer, "    ");
+		for (c = 0; c < conn_len; c++)
+			snd_iprintf(buffer, " 0x%02x", cache_conn[c]);
+		snd_iprintf(buffer, "\n");
+	}
 }
 
 static void print_gpio(struct snd_info_buffer *buffer,
-- 
1.8.1.2