From acdda7915eb5dae20b6e43b8b772b712b1ed32c3 Mon Sep 17 00:00:00 2001 From: Wu Fengguang Date: Fri, 21 Nov 2008 11:41:50 +0800 Subject: [PATCH] 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 Signed-off-by: Takashi Iwai --- sound/pci/hda/hda_eld.c | 56 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c index 248cddf0ee80..d2b7ccca3bb3 100644 --- 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; } -- GitLab