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

[ Upstream commit 7f38ca047b0cb54df7f6d9e4110e292e45dba6ad ]

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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 93bb14e..eb4b9f7 100644 (file)
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1166,6 +1166,18 @@ 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)
 {
@@ -1193,6 +1205,26 @@ 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;
 }
@@ -1338,5 +1370,11 @@ 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;
 }