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Diffstat (limited to 'sound/usb/card.c')
-rw-r--r--sound/usb/card.c32
1 files changed, 25 insertions, 7 deletions
diff --git a/sound/usb/card.c b/sound/usb/card.c
index d356743de2ff..a5ed11ea1145 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -690,7 +690,7 @@ static bool get_alias_id(struct usb_device *dev, unsigned int *id)
return false;
}
-static bool check_delayed_register_option(struct snd_usb_audio *chip, int iface)
+static int check_delayed_register_option(struct snd_usb_audio *chip)
{
int i;
unsigned int id, inum;
@@ -699,14 +699,31 @@ static bool check_delayed_register_option(struct snd_usb_audio *chip, int iface)
if (delayed_register[i] &&
sscanf(delayed_register[i], "%x:%x", &id, &inum) == 2 &&
id == chip->usb_id)
- return inum != iface;
+ return inum;
}
- return false;
+ return -1;
}
static const struct usb_device_id usb_audio_ids[]; /* defined below */
+/* look for the last interface that matches with our ids and remember it */
+static void find_last_interface(struct snd_usb_audio *chip)
+{
+ struct usb_host_config *config = chip->dev->actconfig;
+ struct usb_interface *intf;
+ int i;
+
+ if (!config)
+ return;
+ for (i = 0; i < config->desc.bNumInterfaces; i++) {
+ intf = config->interface[i];
+ if (usb_match_id(intf, usb_audio_ids))
+ chip->last_iface = intf->altsetting[0].desc.bInterfaceNumber;
+ }
+ usb_audio_dbg(chip, "Found last interface = %d\n", chip->last_iface);
+}
+
/* look for the corresponding quirk */
static const struct snd_usb_audio_quirk *
get_alias_quirk(struct usb_device *dev, unsigned int id)
@@ -813,6 +830,7 @@ static int usb_audio_probe(struct usb_interface *intf,
err = -ENODEV;
goto __error;
}
+ find_last_interface(chip);
}
if (chip->num_interfaces >= MAX_CARD_INTERFACES) {
@@ -862,11 +880,11 @@ static int usb_audio_probe(struct usb_interface *intf,
chip->need_delayed_register = false; /* clear again */
}
- /* we are allowed to call snd_card_register() many times, but first
- * check to see if a device needs to skip it or do anything special
+ /* register card if we reach to the last interface or to the specified
+ * one given via option
*/
- if (!snd_usb_registration_quirk(chip, ifnum) &&
- !check_delayed_register_option(chip, ifnum)) {
+ if (check_delayed_register_option(chip) == ifnum ||
+ usb_interface_claimed(usb_ifnum_to_if(dev, chip->last_iface))) {
err = snd_card_register(chip->card);
if (err < 0)
goto __error;