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The USB-audio driver matches per interface, and as default, it registers the card instance at the very first instance. This can be a problem for the devices that have multiple interfaces to be probed, as the udev rule isn't applied properly for the later appearing interfaces. Although we introduced the delayed_register option and the quirks for covering those shortcomings, it's nothing but a workaround for specific devices. This patch is an another attempt to fix the problem in a more generic way. Now the driver checks the whole USB device descriptor at the very first time when an interface is attached to a sound card. It looks at each matching interface in the descriptor and remembers the last matching one. The snd_card_register() is invoked only when this last interface is probed. After this change, the quirks for the delayed registration become superfluous, hence they are removed along with the patch. OTOH, the delayed_register option is still kept, as it might be useful for some corner cases (e.g. a special driver overtakes the interface probe from the standard driver, and the last interface probe may miss). Link: https://lore.kernel.org/r/20220904161247.16461-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __USBAUDIO_QUIRKS_H
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#define __USBAUDIO_QUIRKS_H
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struct audioformat;
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struct snd_usb_endpoint;
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struct snd_usb_substream;
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int snd_usb_create_quirk(struct snd_usb_audio *chip,
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struct usb_interface *iface,
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struct usb_driver *driver,
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const struct snd_usb_audio_quirk *quirk);
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int snd_usb_apply_interface_quirk(struct snd_usb_audio *chip,
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int iface,
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int altno);
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int snd_usb_apply_boot_quirk(struct usb_device *dev,
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struct usb_interface *intf,
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const struct snd_usb_audio_quirk *quirk,
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unsigned int usb_id);
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int snd_usb_apply_boot_quirk_once(struct usb_device *dev,
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struct usb_interface *intf,
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const struct snd_usb_audio_quirk *quirk,
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unsigned int usb_id);
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void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
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const struct audioformat *fmt);
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int snd_usb_is_big_endian_format(struct snd_usb_audio *chip,
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const struct audioformat *fp);
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void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep);
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void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
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__u8 request, __u8 requesttype, __u16 value,
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__u16 index, void *data, __u16 size);
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int snd_usb_select_mode_quirk(struct snd_usb_audio *chip,
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const struct audioformat *fmt);
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u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
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struct audioformat *fp,
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unsigned int sample_bytes);
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void snd_usb_audioformat_attributes_quirk(struct snd_usb_audio *chip,
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struct audioformat *fp,
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int stream);
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void snd_usb_init_quirk_flags(struct snd_usb_audio *chip);
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#endif /* __USBAUDIO_QUIRKS_H */
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