ALSA: hda - support writing to the ELD proc file

Allow users to fix quicks of ELD ROMs by writing new values to the ELD proc
interface. The format is one or more lines of "name hex_value".

Users can add/remove/modify up to 32 SAD(Short Audio Descriptor) entries.

Signed-off-by: Wu Fengguang <wfg@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c
index 248cddf0ee8096704cc72b13d7c38f6e12f9f7d4..d2b7ccca3bb3a1186bed4d3d7f46d5c7ebe63a75 100644 (file)
--- a/sound/pci/hda/hda_eld.c
+++ b/sound/pci/hda/hda_eld.c
@@ -500,6 +500,59 @@ static void hdmi_print_eld_info(struct snd_info_entry *entry,
                hdmi_print_sad_info(i, e->sad + i, buffer);
 }
 
+static void hdmi_write_eld_item(struct snd_info_entry *entry,
+                               struct snd_info_buffer *buffer)
+{
+       struct hdmi_eld *e = entry->private_data;
+       char line[64];
+       char name[64];
+       char *sname;
+       long long val;
+       int n;
+
+       while (!snd_info_get_line(buffer, line, sizeof(line))) {
+               if (sscanf(line, "%s %llx", name, &val) != 2)
+                       continue;
+               if (!strcmp(name, "connection_type"))
+                       e->conn_type = val;
+               else if (!strcmp(name, "port_id"))
+                       e->port_id = val;
+               else if (!strcmp(name, "support_hdcp"))
+                       e->support_hdcp = val;
+               else if (!strcmp(name, "support_ai"))
+                       e->support_ai = val;
+               else if (!strcmp(name, "audio_sync_delay"))
+                       e->aud_synch_delay = val;
+               else if (!strcmp(name, "speakers"))
+                       e->spk_alloc = val;
+               else if (!strcmp(name, "sad_count"))
+                       e->sad_count = val;
+               else if (!strncmp(name, "sad", 3)) {
+                       sname = name + 4;
+                       n = name[3] - '0';
+                       if (name[4] >= '0' && name[4] <= '9') {
+                               sname++;
+                               n = 10 * n + name[4] - '0';
+                       }
+                       if (n < 0 || n > 31) /* double the CEA limit */
+                               continue;
+                       if (!strcmp(sname, "_coding_type"))
+                               e->sad[n].format = val;
+                       else if (!strcmp(sname, "_channels"))
+                               e->sad[n].channels = val;
+                       else if (!strcmp(sname, "_rates"))
+                               e->sad[n].rates = val;
+                       else if (!strcmp(sname, "_bits"))
+                               e->sad[n].sample_bits = val;
+                       else if (!strcmp(sname, "_max_bitrate"))
+                               e->sad[n].max_bitrate = val;
+                       if (n >= e->sad_count)
+                               e->sad_count = n + 1;
+               }
+       }
+}
+
+
 int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld)
 {
        char name[32];
@@ -512,6 +565,9 @@ int snd_hda_eld_proc_new(struct hda_codec *codec, struct hdmi_eld *eld)
                return err;
 
        snd_info_set_text_ops(entry, eld, hdmi_print_eld_info);
+       entry->c.text.write = hdmi_write_eld_item;
+       entry->mode |= S_IWUSR;
+
        return 0;
 }