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authorDaniel Mack <daniel@caiaq.de>2010-05-26 18:11:39 +0200
committerTakashi Iwai <tiwai@suse.de>2010-05-27 09:49:37 +0200
commit92c256110fa9566de639ef8948b4fb430aa495b3 (patch)
treee20254c319911c02a9973280f4d678f13ff96584 /sound
parentALSA: usb-audio: parse UAC2 endpoint descriptors correctly (diff)
downloadlinux-92c256110fa9566de639ef8948b4fb430aa495b3.tar.xz
linux-92c256110fa9566de639ef8948b4fb430aa495b3.zip
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>
Diffstat (limited to 'sound')
-rw-r--r--sound/usb/pcm.c37
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;