ALSA: usb-audio: Add mode select quirk for Denon/Marantz DACs

Denon/Marantz USB DACs need a specific vendor command to switch between PCM and
DSD mode. This patch adds a new quirk function to switch between the two modes
using the specific USB vendor command.

This patch applies to the following devices:
- Marantz SA-14S1
- Marantz HD-DAC1

Signed-off-by: Jurgen Kramer <gtmkramer@xs4all.nl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index c62a165..0d8aba5 100644 (file)
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -482,6 +482,11 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
        /* set interface */
        if (subs->interface != fmt->iface ||
            subs->altset_idx != fmt->altset_idx) {
+
+               err = snd_usb_select_mode_quirk(subs, fmt);
+               if (err < 0)
+                       return -EIO;
+
                err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
                if (err < 0) {
                        dev_err(&dev->dev,

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index a9d4add..e0cde74 100644 (file)
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1111,6 +1111,44 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
        }
 }
 
+
+/* Marantz/Denon USB DACs need a vendor cmd to switch
+ * between PCM and native DSD mode
+ */
+int snd_usb_select_mode_quirk(struct snd_usb_substream *subs,
+                             struct audioformat *fmt)
+{
+       struct usb_device *dev = subs->dev;
+       int err;
+
+       switch (subs->stream->chip->usb_id) {
+       case USB_ID(0x154e, 0x3005): /* Marantz HD-DAC1 */
+       case USB_ID(0x154e, 0x3006): /* Marantz SA-14S1 */
+
+               /* First switch to alt set 0, otherwise the mode switch cmd
+                * will not be accepted by the DAC
+                */
+               err = usb_set_interface(dev, fmt->iface, 0);
+               if (err < 0)
+                       return err;
+
+               mdelay(20); /* Delay needed after setting the interface */
+
+               switch (fmt->altsetting) {
+               case 2: /* DSD mode requested */
+               case 1: /* PCM mode requested */
+                       err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0,
+                                             USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
+                                             fmt->altsetting - 1, 1, NULL, 0);
+                       if (err < 0)
+                               return err;
+                       break;
+               }
+               mdelay(20);
+       }
+       return 0;
+}
+
 void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep)
 {
        /*

diff --git a/sound/usb/quirks.h b/sound/usb/quirks.h
index 665e972..1b86238 100644 (file)
--- a/sound/usb/quirks.h
+++ b/sound/usb/quirks.h
@@ -31,6 +31,9 @@ void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
                           __u8 request, __u8 requesttype, __u16 value,
                           __u16 index, void *data, __u16 size);
 
+int snd_usb_select_mode_quirk(struct snd_usb_substream *subs,
+                             struct audioformat *fmt);
+
 u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
                                        struct audioformat *fp,
                                        unsigned int sample_bytes);