This patch adds native DSD support for the following devices.

- TEAC NT-503 - TEAC UD-503 - TEAC UD-501

(1)Add quirks for native DSD support for TEAC devices. (2)A specific vendor command is needed to switch between PCM/DOP and DSD mode, same as Denon/Marantz devices.

Signed-off-by: Nobutaka Okabe nob77413@gmail.com --- sound/usb/quirks.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c index 2782155..b3fd238 100644 --- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -1165,6 +1165,18 @@ static bool is_marantz_denon_dac(unsigned int id) return false; }

+/* TEAC UD-501/UD-503/NT-503 USB DACs need a vendor cmd to switch + * between PCM/DOP and native DSD mode + */ +static bool is_teac_50X_dac(unsigned int id) +{ + switch (id) { + case USB_ID(0x0644, 0x8043): /* TEAC UD-501/UD-503/NT-503 */ + return true; + } + return false; +} + int snd_usb_select_mode_quirk(struct snd_usb_substream *subs, struct audioformat *fmt) { @@ -1192,6 +1204,26 @@ int snd_usb_select_mode_quirk(struct snd_usb_substream *subs, break; } mdelay(20); + } else if (is_teac_50X_dac(subs->stream->chip->usb_id)) { + /* Vendor mode switch cmd is required. */ + switch (fmt->altsetting) { + case 3: /* DSD mode (DSD_U32) requested */ + err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0, + USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE, + 1, 1, NULL, 0); + if (err < 0) + return err; + break; + + case 2: /* PCM or DOP mode (S32) requested */ + case 1: /* PCM mode (S16) requested */ + err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0, + USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE, + 0, 1, NULL, 0); + if (err < 0) + return err; + break; + } } return 0; } @@ -1337,5 +1369,11 @@ u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip, return SNDRV_PCM_FMTBIT_DSD_U32_BE; }

+ /* TEAC devices with USB DAC functionality */ + if (is_teac_50X_dac(chip->usb_id)) { + if (fp->altsetting == 3) + return SNDRV_PCM_FMTBIT_DSD_U32_BE; + } + return 0; }