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ALSA: usb-audio: separate sync endpoint setting from set_format

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Setting the sync endpoint currently takes up about half of set_format().
Move it to a dedicated function.
No functional change.

Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Eldad Zack 2013-08-03 10:50:17 +02:00 committed by Takashi Iwai
parent d133f2c22e
commit 71bb64c56d
1 changed files with 73 additions and 55 deletions
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128
sound/usb/pcm.c
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@ -327,64 +327,17 @@ static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
return 0; return 0;
} }
/*
* find a matching format and set up the interface static int set_sync_endpoint(struct snd_usb_substream *subs,
*/ struct audioformat *fmt,
static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) struct usb_device *dev,
struct usb_host_interface *alts,
struct usb_interface_descriptor *altsd)
{ {
struct usb_device *dev = subs->dev;
struct usb_host_interface *alts;
struct usb_interface_descriptor *altsd;
struct usb_interface *iface; struct usb_interface *iface;
unsigned int ep, attr;
int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
int err, implicit_fb = 0; unsigned int ep, attr;
int implicit_fb = 0;
iface = usb_ifnum_to_if(dev, fmt->iface);
if (WARN_ON(!iface))
return -EINVAL;
alts = &iface->altsetting[fmt->altset_idx];
altsd = get_iface_desc(alts);
if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
return -EINVAL;
if (fmt == subs->cur_audiofmt)
return 0;
/* close the old interface */
if (subs->interface >= 0 && subs->interface != fmt->iface) {
err = usb_set_interface(subs->dev, subs->interface, 0);
if (err < 0) {
snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
dev->devnum, fmt->iface, fmt->altsetting, err);
return -EIO;
}
subs->interface = -1;
subs->altset_idx = 0;
}
/* set interface */
if (subs->interface != fmt->iface ||
subs->altset_idx != fmt->altset_idx) {
err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
if (err < 0) {
snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
dev->devnum, fmt->iface, fmt->altsetting, err);
return -EIO;
}
snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
fmt->iface, fmt->altsetting);
subs->interface = fmt->iface;
subs->altset_idx = fmt->altset_idx;
snd_usb_set_interface_quirk(dev);
}
subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
alts, fmt->endpoint, subs->direction,
SND_USB_ENDPOINT_TYPE_DATA);
if (!subs->data_endpoint)
return -EINVAL;
/* we need a sync pipe in async OUT or adaptive IN mode */ /* we need a sync pipe in async OUT or adaptive IN mode */
/* check the number of EP, since some devices have broken /* check the number of EP, since some devices have broken
@ -479,6 +432,71 @@ add_sync_ep:
subs->data_endpoint->sync_master = subs->sync_endpoint; subs->data_endpoint->sync_master = subs->sync_endpoint;
} }
return 0;
}
/*
* find a matching format and set up the interface
*/
static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
{
struct usb_device *dev = subs->dev;
struct usb_host_interface *alts;
struct usb_interface_descriptor *altsd;
struct usb_interface *iface;
int err;
iface = usb_ifnum_to_if(dev, fmt->iface);
if (WARN_ON(!iface))
return -EINVAL;
alts = &iface->altsetting[fmt->altset_idx];
altsd = get_iface_desc(alts);
if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
return -EINVAL;
if (fmt == subs->cur_audiofmt)
return 0;
/* close the old interface */
if (subs->interface >= 0 && subs->interface != fmt->iface) {
err = usb_set_interface(subs->dev, subs->interface, 0);
if (err < 0) {
snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed (%d)\n",
dev->devnum, fmt->iface, fmt->altsetting, err);
return -EIO;
}
subs->interface = -1;
subs->altset_idx = 0;
}
/* set interface */
if (subs->interface != fmt->iface ||
subs->altset_idx != fmt->altset_idx) {
err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
if (err < 0) {
snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed (%d)\n",
dev->devnum, fmt->iface, fmt->altsetting, err);
return -EIO;
}
snd_printdd(KERN_INFO "setting usb interface %d:%d\n",
fmt->iface, fmt->altsetting);
subs->interface = fmt->iface;
subs->altset_idx = fmt->altset_idx;
snd_usb_set_interface_quirk(dev);
}
subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
alts, fmt->endpoint, subs->direction,
SND_USB_ENDPOINT_TYPE_DATA);
if (!subs->data_endpoint)
return -EINVAL;
err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
if (err < 0)
return err;
err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt); err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
if (err < 0) if (err < 0)
return err; return err;