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ALSA: usb-audio: Add native DSD support for TEAC 501/503 DAC 

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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
hifive-unleashed-5.1
Nobutaka Okabe 2016-12-13 01:24:08 +09:00 committed by Takashi Iwai
parent 152fce5a23
commit 7f38ca047b
1 changed files with 38 additions and 0 deletions
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38
sound/usb/quirks.c
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@ -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;
}