Applications may want to read ELD information to understand what codecs are supported on the HDMI receiver and handle the a-v delay for better lip-sync.

ELD information is exposed in a device-specific IFACE_PCM kcontrol.

Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- sound/pci/hda/hda_eld.c | 9 ++--- sound/pci/hda/hda_local.h | 2 + sound/pci/hda/patch_hdmi.c | 85 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 91 insertions(+), 5 deletions(-)

diff --git a/sound/pci/hda/hda_eld.c b/sound/pci/hda/hda_eld.c index 28ce17d..8f16b20 100644 --- a/sound/pci/hda/hda_eld.c +++ b/sound/pci/hda/hda_eld.c @@ -335,21 +335,20 @@ int snd_hdmi_get_eld(struct hdmi_eld *eld, snd_printd(KERN_INFO "HDMI: ELD buf size is 0, force 128\n"); size = 128; } - if (size < ELD_FIXED_BYTES || size > PAGE_SIZE) { + if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE || size > PAGE_SIZE) { snd_printd(KERN_INFO "HDMI: invalid ELD buf size %d\n", size); return -ERANGE; }

- buf = kmalloc(size, GFP_KERNEL); - if (!buf) - return -ENOMEM; + /* update info */ + eld->eld_size = size; + buf = eld->eld_buffer;

for (i = 0; i < size; i++) buf[i] = hdmi_get_eld_byte(codec, nid, i);

ret = hdmi_update_eld(eld, buf, size);

- kfree(buf); return ret; }

diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h index 9ed4b0d..cd579a6 100644 --- a/sound/pci/hda/hda_local.h +++ b/sound/pci/hda/hda_local.h @@ -609,6 +609,7 @@ struct cea_sad { };

#define ELD_FIXED_BYTES 20 +#define ELD_MAX_SIZE 256 #define ELD_MAX_MNL 16 #define ELD_MAX_SAD 16

@@ -633,6 +634,7 @@ struct hdmi_eld { int spk_alloc; int sad_count; struct cea_sad sad[ELD_MAX_SAD]; + char eld_buffer[ELD_MAX_SIZE]; #ifdef CONFIG_PROC_FS struct snd_info_entry *proc_entry; #endif diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 19cb72d..5ea9b55 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -324,6 +324,83 @@ static int cvt_nid_to_cvt_index(struct hdmi_spec *spec, hda_nid_t cvt_nid) return -EINVAL; }

+static int hdmi_eld_ctl_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + struct hda_codec *codec = snd_kcontrol_chip(kcontrol); + struct hdmi_spec *spec; + struct hdmi_spec_per_pin *per_pin; + struct hdmi_eld *eld; + int pin_idx; + + uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES; + pin_idx = kcontrol->private_value; + spec = codec->spec; + + if (pin_idx < 0) { + uinfo->count = 0; + } else { + per_pin = &spec->pins[pin_idx]; + eld = &per_pin->sink_eld; + uinfo->count = eld->eld_size; + } + return 0; +} + +static int hdmi_eld_ctl_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct hda_codec *codec = snd_kcontrol_chip(kcontrol); + struct hdmi_spec *spec; + struct hdmi_spec_per_pin *per_pin; + struct hdmi_eld *eld; + int pin_idx; + + spec = codec->spec; + pin_idx = kcontrol->private_value; + + if (pin_idx < 0) { + memset(ucontrol->value.bytes.data, 0, ELD_MAX_SIZE); + } else { + per_pin = &spec->pins[pin_idx]; + eld = &per_pin->sink_eld; + memcpy(ucontrol->value.bytes.data, eld->eld_buffer, + (eld->eld_size > ELD_MAX_SIZE) ? + ELD_MAX_SIZE : eld->eld_size); + } + return 0; +} + +static struct snd_kcontrol_new eld_bytes_ctl = { + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = "ELD", + .info = hdmi_eld_ctl_info, + .get = hdmi_eld_ctl_get, +}; + +static int hdmi_create_eld_ctl(struct hda_codec *codec, int pin_idx, + int device) +{ + struct snd_kcontrol *kctl; + struct hdmi_spec *spec = codec->spec; + int err; + + if (pin_idx < 0) + return -EINVAL; + + kctl = snd_ctl_new1(&eld_bytes_ctl, codec); + if (!kctl) + return -ENOMEM; + kctl->private_value = pin_idx; + kctl->id.device = device; + + err = snd_hda_ctl_add(codec, spec->pins[pin_idx].pin_nid, kctl); + if (err < 0) + return err; + + return 0; +} + #ifdef BE_PARANOID static void hdmi_get_dip_index(struct hda_codec *codec, hda_nid_t pin_nid, int *packet_index, int *byte_index) @@ -1176,6 +1253,14 @@ static int generic_hdmi_build_controls(struct hda_codec *codec) if (err < 0) return err; snd_hda_spdif_ctls_unassign(codec, pin_idx); + + /* add control for ELD Bytes */ + err = hdmi_create_eld_ctl(codec, + pin_idx, + spec->pcm_rec[pin_idx].device); + + if (err < 0) + return err; }

return 0;