ALSA: hda - add device list & select info of display pins to codec proc file

If a display codec supports multi-stream transport on the pins, the pin's
device list length and device entries will be exposed to codec proc file.

Signed-off-by: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 33 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index 9760f001916d..a8cb22eec89e 100644
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -582,6 +582,36 @@ static void print_gpio(struct snd_info_buffer *buffer,
         print_nid_array(buffer, codec, nid, &codec->nids);
 }
 
+static void print_device_list(struct snd_info_buffer *buffer,
+                            struct hda_codec *codec, hda_nid_t nid)
+{
+        int i, curr = -1;
+        u8 dev_list[AC_MAX_DEV_LIST_LEN];
+        int devlist_len;
+
+        devlist_len = snd_hda_get_devices(codec, nid, dev_list,
+                                        AC_MAX_DEV_LIST_LEN);
+        snd_iprintf(buffer, "  Devices: %d\n", devlist_len);
+        if (devlist_len <= 0)
+                return;
+
+        curr = snd_hda_codec_read(codec, nid, 0,
+                                AC_VERB_GET_DEVICE_SEL, 0);
+
+        for (i = 0; i < devlist_len; i++) {
+                if (i == curr)
+                        snd_iprintf(buffer, "    *");
+                else
+                        snd_iprintf(buffer, "     ");
+
+                snd_iprintf(buffer,
+                        "Dev %02d: PD = %d, ELDV = %d, IA = %d\n", i,
+                        !!(dev_list[i] & AC_DE_PD),
+                        !!(dev_list[i] & AC_DE_ELDV),
+                        !!(dev_list[i] & AC_DE_IA));
+        }
+}
+
 static void print_codec_info(struct snd_info_entry *entry,
                              struct snd_info_buffer *buffer)
 {
@@ -751,6 +781,9 @@ static void print_codec_info(struct snd_info_entry *entry,
                                     (wid_caps & AC_WCAP_DELAY) >>
                                     AC_WCAP_DELAY_SHIFT);
 
+                if (wid_type == AC_WID_PIN && codec->dp_mst)
+                        print_device_list(buffer, codec, nid);
+
                 if (wid_caps & AC_WCAP_CONN_LIST)
                         print_conn_list(buffer, codec, nid, wid_type,
                                         conn, conn_len);