Commit 92c25611 authored by Daniel Mack's avatar Daniel Mack Committed by Takashi Iwai
Browse files

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



This request is again handled differently in comparison to UAC1.

Signed-off-by: default avatarDaniel Mack <daniel@caiaq.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 43b8e3bc

sound/usb/pcm.c

+30 −7
Original line number Diff line number Diff line
@@ -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;