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>

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 2bf0d77..056587d 100644 (file)
--- 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;