diff options
| -rw-r--r-- | sound/usb/pcm.c | 128 |
1 files changed, 73 insertions, 55 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index be5c7c2219ea..e24ce7d58d83 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -327,64 +327,17 @@ static int search_roland_implicit_fb(struct usb_device *dev, int ifnum, return 0; } -/* - * find a matching format and set up the interface - */ -static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) + +static int set_sync_endpoint(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; - unsigned int ep, attr; int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK; - int err, 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; + unsigned int ep, attr; + int implicit_fb = 0; /* we need a sync pipe in async OUT or adaptive IN mode */ /* 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; } + 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); if (err < 0) return err; |