2b58fd5b31
Playback Designs' USB devices have some hardware limitations on their USB interface. In particular: - They need a 20ms delay after each class compliant request as the hardware ACKs the USB packets before the device is actually ready for the next command. Sending data immediately will result in buffer overflows in the hardware. - The devices send bogus feedback data at the start of each stream which confuse the feedback format auto-detection. This patch introduces a new quirks hook that is called after each control packet and which adds a delay for all devices that match Playback Designs' USB VID for now. In addition, it adds a counter to snd_usb_endpoint to drop received packets on the floor. Another new quirks function that is called once an endpoint is started initializes that counter for these devices on their sync endpoint. Signed-off-by: Daniel Mack <zonque@gmail.com> Reported-and-tested-by: Andreas Koch <andreas@akdesigninc.com> Supported-by: Demian Martin <demianm_1@yahoo.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
34 lines
985 B
C
34 lines
985 B
C
#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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void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
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struct audioformat *fmt);
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int snd_usb_is_big_endian_format(struct snd_usb_audio *chip,
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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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#endif /* __USBAUDIO_QUIRKS_H */
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