ALSA: usb-audio: add support for UAC2 pitch control

This request is again handled differently in comparison to UAC1.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 30 insertions, 7 deletions

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 2bf0d77d1768..056587de7be4 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -120,10 +120,6 @@ static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
 
         ep = get_endpoint(alts, 0)->bEndpointAddress;
 
-        /* if endpoint doesn't have pitch control, bail out */
-        if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
-                return 0;
-
         data[0] = 1;
         if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
                                    USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
@@ -137,8 +133,32 @@ static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
         return 0;
 }
 
+static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
+                         struct usb_host_interface *alts,
+                         struct audioformat *fmt)
+{
+        struct usb_device *dev = chip->dev;
+        unsigned char data[1];
+        unsigned int ep;
+        int err;
+
+        ep = get_endpoint(alts, 0)->bEndpointAddress;
+
+        data[0] = 1;
+        if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
+                                   USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
+                                   UAC2_EP_CS_PITCH << 8, 0,
+                                   data, sizeof(data), 1000)) < 0) {
+                snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH (v2)\n",
+                           dev->devnum, iface, fmt->altsetting);
+                return err;
+        }
+
+        return 0;
+}
+
 /*
- * initialize the picth control and sample rate
+ * initialize the pitch control and sample rate
  */
 int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
                        struct usb_host_interface *alts,
@@ -146,13 +166,16 @@ int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 {
         struct usb_interface_descriptor *altsd = get_iface_desc(alts);
 
+        /* if endpoint doesn't have pitch control, bail out */
+        if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
+                return 0;
+
         switch (altsd->bInterfaceProtocol) {
         case UAC_VERSION_1:
                 return init_pitch_v1(chip, iface, alts, fmt);
 
         case UAC_VERSION_2:
-                /* not implemented yet */
-                return 0;
+                return init_pitch_v2(chip, iface, alts, fmt);
         }
 
         return -EINVAL;