[alsa-devel] [Intel-gfx] [RFC][PATCH] ELD routines and proc interface

[Wu Fengguang]

On Thu, Nov 20, 2008 at 05:46:49PM -0800, Shane W wrote:
> On Fri, Nov 21, 2008 at 09:36:55AM +0800, Wu Fengguang wrote:

> > Yes it's unexpected. Do you know its real speaker numbers and
> > allocations? Does it provide some number of line-out ports?
> 
> There are six speakers connected, fl, ct, fr, rl, rr and lfe.

Hi Shane,

Apply this patch and run "echo speakers f > /proc/asound/card0/eld\#3".
That will make the ELD "speakers" field right.

Thanks,
Fengguang
---
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 at linux.intel.com>
---
 sound/pci/hda/hda_eld.c |   56 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

--- sound-2.6.orig/sound/pci/hda/hda_eld.c
+++ sound-2.6/sound/pci/hda/hda_eld.c
@@ -500,6 +500,59 @@ static void hdmi_print_eld_info(struct s
 		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_code
 		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;
 }