diff options
| -rw-r--r-- | sound/usb/pcm.c | 83 |
1 files changed, 66 insertions, 17 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index 380d7275d187..2b11c2c837bf 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -272,33 +272,70 @@ static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream) return 0; } -static int search_roland_implicit_fb(struct usb_device *dev, int ifnum, - unsigned int altsetting, - struct usb_host_interface **alts, - unsigned int *ep) +/* Check whether the given iface:altsetting points to an implicit fb source */ +static bool search_generic_implicit_fb(struct usb_device *dev, int ifnum, + unsigned int altsetting, + struct usb_host_interface **altsp, + unsigned int *ep) { struct usb_interface *iface; + struct usb_host_interface *alts; + struct usb_interface_descriptor *altsd; + struct usb_endpoint_descriptor *epd; + + iface = usb_ifnum_to_if(dev, ifnum); + if (!iface) + return false; + alts = usb_altnum_to_altsetting(iface, altsetting); + if (!alts) + return false; + altsd = get_iface_desc(alts); + if (altsd->bInterfaceClass != USB_CLASS_AUDIO || + altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING || + altsd->bInterfaceProtocol != UAC_VERSION_2 || + altsd->bNumEndpoints < 1) + return false; + epd = get_endpoint(alts, 0); + if (!usb_endpoint_is_isoc_in(epd) || + (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) != + USB_ENDPOINT_USAGE_IMPLICIT_FB) + return false; + *ep = epd->bEndpointAddress; + *altsp = alts; + return true; +} + +/* Like the function above, but specific to Roland with vendor class and hack */ +static bool search_roland_implicit_fb(struct usb_device *dev, int ifnum, + unsigned int altsetting, + struct usb_host_interface **altsp, + unsigned int *ep) +{ + struct usb_interface *iface; + struct usb_host_interface *alts; struct usb_interface_descriptor *altsd; struct usb_endpoint_descriptor *epd; iface = usb_ifnum_to_if(dev, ifnum); - if (!iface || iface->num_altsetting < altsetting + 1) - return -ENOENT; - *alts = &iface->altsetting[altsetting]; - altsd = get_iface_desc(*alts); - if (altsd->bAlternateSetting != altsetting || - altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC || + if (!iface) + return false; + alts = usb_altnum_to_altsetting(iface, altsetting); + if (!alts) + return false; + altsd = get_iface_desc(alts); + if (altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC || (altsd->bInterfaceSubClass != 2 && - altsd->bInterfaceProtocol != 2 ) || + altsd->bInterfaceProtocol != 2) || altsd->bNumEndpoints < 1) - return -ENOENT; - epd = get_endpoint(*alts, 0); + return false; + epd = get_endpoint(alts, 0); if (!usb_endpoint_is_isoc_in(epd) || (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) != USB_ENDPOINT_USAGE_IMPLICIT_FB) - return -ENOENT; + return false; *ep = epd->bEndpointAddress; - return 0; + *altsp = alts; + return true; } /* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk @@ -375,6 +412,19 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs, return 0; } + /* Generic UAC2 implicit feedback */ + if (attr == USB_ENDPOINT_SYNC_ASYNC && + altsd->bInterfaceClass == USB_CLASS_AUDIO && + altsd->bInterfaceProtocol == UAC_VERSION_2 && + altsd->bNumEndpoints == 1) { + ifnum = altsd->bInterfaceNumber + 1; + if (search_generic_implicit_fb(dev, ifnum, + altsd->bAlternateSetting, + &alts, &ep)) + goto add_sync_ep; + } + + /* Roland/BOSS implicit feedback with vendor spec class */ if (attr == USB_ENDPOINT_SYNC_ASYNC && altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC && altsd->bInterfaceProtocol == 2 && @@ -382,9 +432,8 @@ static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs, USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ && search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1, altsd->bAlternateSetting, - &alts, &ep) >= 0) { + &alts, &ep)) goto add_sync_ep; - } /* No quirk */ return 0; |