ALSA: usb-audio: Add native DSD support for TEAC 501/503 DAC (7f38ca04) · Commits · 戴 / test

sound/usb/quirks.c

+38 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}