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authorClemens Ladisch <clemens@ladisch.de>2013-04-04 21:43:57 +0200
committerClemens Ladisch <clemens@ladisch.de>2013-06-27 21:59:49 +0200
commitb1ce7ba619d9de53db7fad25f445ca9abc2b63df (patch)
tree09e6fd2e2f1d81e54e52789ad1baf3eee2992b81 /sound/usb
parent8e5ced83dd1c3090c96c4e0614703f0f2a5ba2f4 (diff)
downloadlinux-b1ce7ba619d9de53db7fad25f445ca9abc2b63df.tar.bz2
ALSA: usb-audio: claim autodetected PCM interfaces all at once
snd_card_register() registers all devices newly added since the last call. However, the playback/capture streams are handled as one ALSA device, so the second /dev device will not be registered if the PCM streams are added in two steps. QUIRK_AUTODETECT caused the probe callback to be called once for each interface, which triggered this problem. Work around this by handling this like the composite quirk, i.e., autodetecting all other interfaces that might be used for PCM or MIDI. Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/quirks.c40
1 files changed, 37 insertions, 3 deletions
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 5363bcca9494..5b01330b8452 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -337,8 +337,7 @@ static int create_auto_midi_quirk(struct snd_usb_audio *chip,
static int create_autodetect_quirk(struct snd_usb_audio *chip,
struct usb_interface *iface,
- struct usb_driver *driver,
- const struct snd_usb_audio_quirk *quirk)
+ struct usb_driver *driver)
{
int err;
@@ -348,6 +347,41 @@ static int create_autodetect_quirk(struct snd_usb_audio *chip,
return err;
}
+static int create_autodetect_quirks(struct snd_usb_audio *chip,
+ struct usb_interface *iface,
+ struct usb_driver *driver,
+ const struct snd_usb_audio_quirk *quirk)
+{
+ int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
+ int ifcount, ifnum, err;
+
+ err = create_autodetect_quirk(chip, iface, driver);
+ if (err < 0)
+ return err;
+
+ /*
+ * ALSA PCM playback/capture devices cannot be registered in two steps,
+ * so we have to claim the other corresponding interface here.
+ */
+ ifcount = chip->dev->actconfig->desc.bNumInterfaces;
+ for (ifnum = 0; ifnum < ifcount; ifnum++) {
+ if (ifnum == probed_ifnum || quirk->ifnum >= 0)
+ continue;
+ iface = usb_ifnum_to_if(chip->dev, ifnum);
+ if (!iface ||
+ usb_interface_claimed(iface) ||
+ get_iface_desc(iface->altsetting)->bInterfaceClass !=
+ USB_CLASS_VENDOR_SPEC)
+ continue;
+
+ err = create_autodetect_quirk(chip, iface, driver);
+ if (err >= 0)
+ usb_driver_claim_interface(driver, iface, (void *)-1L);
+ }
+
+ return 0;
+}
+
/*
* Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.
* The only way to detect the sample rate is by looking at wMaxPacketSize.
@@ -476,7 +510,7 @@ int snd_usb_create_quirk(struct snd_usb_audio *chip,
static const quirk_func_t quirk_funcs[] = {
[QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
[QUIRK_COMPOSITE] = create_composite_quirk,
- [QUIRK_AUTODETECT] = create_autodetect_quirk,
+ [QUIRK_AUTODETECT] = create_autodetect_quirks,
[QUIRK_MIDI_STANDARD_INTERFACE] = create_any_midi_quirk,
[QUIRK_MIDI_FIXED_ENDPOINT] = create_any_midi_quirk,
[QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,