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ALSA: hda - support writing to the ELD proc file

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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>
This commit is contained in:
Wu Fengguang 2008-11-21 11:41:50 +08:00 committed by Takashi Iwai
parent db74210470
commit acdda7915e
1 changed files with 56 additions and 0 deletions
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56
sound/pci/hda/hda_eld.c
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@ -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;
}