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Commit acdda791 authored by Wu Fengguang's avatar Wu Fengguang Committed by Takashi Iwai
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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: default avatarWu Fengguang <wfg@linux.intel.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent db742104

sound/pci/hda/hda_eld.c

+56 −0
Original line number Diff line number Diff line
@@ -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;

}