On Fri, May 11, 2018 at 6:25 PM, Jorge Sanjuan <jorge.sanjuan@xxxxxxxxxxxxxxx> wrote: > This adds support for the MIXER UNIT in UAC3. All the information > is obtained from the (HIGH CAPABILITY) Cluster's header. We don't > read the rest of the logical cluster to obtain the channel config > as that wont make any difference in the current mixer behaviour. > > The name of the mixer unit is not yet requested as there is not > support for the UAC3 Class Specific String requests. > > Tested in an UAC3 device working as a HEADSET with a basic mixer > unit (same as the one in the BADD spec) with no controls. I tested this patch in a similar use-case (with a simple mixer unit), but _with_ controls and along with patch [1] from this series, which added parsing input terminal's channels. So everything works fine, I see all needed requests handling and mixer unit creation on ALSA side, which I can use now. So, as a bottom line: Reviewed-by: Ruslan Bilovol <ruslan.bilovol@xxxxxxxxx> Tested-by: Ruslan Bilovol <ruslan.bilovol@xxxxxxxxx> [1] http://mailman.alsa-project.org/pipermail/alsa-devel/2018-May/136030.html > > Signed-off-by: Jorge Sanjuan <jorge.sanjuan@xxxxxxxxxxxxxxx> > --- > include/uapi/linux/usb/audio.h | 19 +++++++-- > sound/usb/mixer.c | 88 ++++++++++++++++++++++++++++++++++++++---- > 2 files changed, 97 insertions(+), 10 deletions(-) > > diff --git a/include/uapi/linux/usb/audio.h b/include/uapi/linux/usb/audio.h > index 3a78e7145689..13d98e6e0db1 100644 > --- a/include/uapi/linux/usb/audio.h > +++ b/include/uapi/linux/usb/audio.h > @@ -285,9 +285,22 @@ static inline __u8 uac_mixer_unit_iChannelNames(struct uac_mixer_unit_descriptor > static inline __u8 *uac_mixer_unit_bmControls(struct uac_mixer_unit_descriptor *desc, > int protocol) > { > - return (protocol == UAC_VERSION_1) ? > - &desc->baSourceID[desc->bNrInPins + 4] : > - &desc->baSourceID[desc->bNrInPins + 6]; > + switch (protocol) { > + case UAC_VERSION_1: > + return &desc->baSourceID[desc->bNrInPins + 4]; > + case UAC_VERSION_2: > + return &desc->baSourceID[desc->bNrInPins + 6]; > + case UAC_VERSION_3: > + return &desc->baSourceID[desc->bNrInPins + 2]; > + default: > + return NULL; > + } > +} > + > +static inline __u16 uac3_mixer_unit_wClusterDescrID(struct uac_mixer_unit_descriptor *desc) > +{ > + return (desc->baSourceID[desc->bNrInPins + 1] << 8) | > + desc->baSourceID[desc->bNrInPins]; > } > > static inline __u8 uac_mixer_unit_iMixer(struct uac_mixer_unit_descriptor *desc) > diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c > index 76417943ff85..129c1397f0cb 100644 > --- a/sound/usb/mixer.c > +++ b/sound/usb/mixer.c > @@ -719,6 +719,66 @@ static int get_term_name(struct snd_usb_audio *chip, struct usb_audio_term *iter > } > > /* > + * Get logical cluster information for UAC3 devices. > + */ > +static int get_cluster_channels_v3(struct mixer_build *state, unsigned int cluster_id) > +{ > + struct uac3_cluster_header_descriptor c_header; > + int err; > + > + err = snd_usb_ctl_msg(state->chip->dev, > + usb_rcvctrlpipe(state->chip->dev, 0), > + UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR, > + USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN, > + cluster_id, > + snd_usb_ctrl_intf(state->chip), > + &c_header, sizeof(c_header)); > + if (err < 0) > + goto error; > + if (err != sizeof(c_header)) { > + err = -EIO; > + goto error; > + } > + > + return c_header.bNrChannels; > + > +error: > + usb_audio_err(state->chip, "cannot request logical cluster ID: %d (err: %d)\n", cluster_id, err); > + return err; > +} > + > +/* > + * Get number of channels for a Mixer Unit. > + */ > +static int uac_mixer_unit_get_channels(struct mixer_build *state, > + struct uac_mixer_unit_descriptor *desc) > +{ > + int mu_channels; > + > + if (desc->bLength < 11) > + return -EINVAL; > + if (!desc->bNrInPins) > + return -EINVAL; > + > + switch (state->mixer->protocol) { > + case UAC_VERSION_1: > + case UAC_VERSION_2: > + default: > + mu_channels = uac_mixer_unit_bNrChannels(desc); > + break; > + case UAC_VERSION_3: > + mu_channels = get_cluster_channels_v3(state, > + uac3_mixer_unit_wClusterDescrID(desc)); > + break; > + } > + > + if (!mu_channels) > + return -EINVAL; > + > + return mu_channels; > +} > + > +/* > * parse the source unit recursively until it reaches to a terminal > * or a branched unit. > */ > @@ -865,6 +925,18 @@ static int check_input_term(struct mixer_build *state, int id, > term->name = le16_to_cpu(d->wClockSourceStr); > return 0; > } > + case UAC3_MIXER_UNIT: { > + struct uac_mixer_unit_descriptor *d = p1; > + > + err = uac_mixer_unit_get_channels(state, d); > + if (err < 0) > + return err; > + > + term->channels = err; > + term->type = d->bDescriptorSubtype << 16; /* virtual type */ > + > + return 0; > + } > default: > return -ENODEV; > } > @@ -1798,11 +1870,10 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, > */ > static void build_mixer_unit_ctl(struct mixer_build *state, > struct uac_mixer_unit_descriptor *desc, > - int in_pin, int in_ch, int unitid, > - struct usb_audio_term *iterm) > + int in_pin, int in_ch, int num_outs, > + int unitid, struct usb_audio_term *iterm) > { > struct usb_mixer_elem_info *cval; > - unsigned int num_outs = uac_mixer_unit_bNrChannels(desc); > unsigned int i, len; > struct snd_kcontrol *kctl; > const struct usbmix_name_map *map; > @@ -1879,14 +1950,17 @@ static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, > int input_pins, num_ins, num_outs; > int pin, ich, err; > > - if (desc->bLength < 11 || !(input_pins = desc->bNrInPins) || > - !(num_outs = uac_mixer_unit_bNrChannels(desc))) { > + err = uac_mixer_unit_get_channels(state, desc); > + if (err < 0) { > usb_audio_err(state->chip, > "invalid MIXER UNIT descriptor %d\n", > unitid); > - return -EINVAL; > + return err; > } > > + num_outs = err; > + input_pins = desc->bNrInPins; > + > num_ins = 0; > ich = 0; > for (pin = 0; pin < input_pins; pin++) { > @@ -1913,7 +1987,7 @@ static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, > } > } > if (ich_has_controls) > - build_mixer_unit_ctl(state, desc, pin, ich, > + build_mixer_unit_ctl(state, desc, pin, ich, num_outs, > unitid, &iterm); > } > } > -- > 2.11.0 > -- Best regards, Ruslan Bilovol _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
