[alsa-devel] sound: usb-audio: [PATCH]x2 full capture/playback/spdif support for Digidesign Mbox 2

Takashi Iwai tiwai at suse.de
Mon Dec 24 10:38:36 CET 2012


At Sun, 23 Dec 2012 15:54:48 +1100,
Damien Zammit wrote:
> 
> [1  <text/plain; ISO-8859-1 (7bit)>]
> On 23 December 2012 14:36, Damien Zammit <damien.zammit at gmail.com> wrote:
> > I have fixed both the kernel panic and the broken pipe issue with midi.
> > I believe this completes the patch, I just don't know how to submit it to you.
> 
> Please find attached the patch you accepted previously: (Version 5)
> Plus an incremental patch (Version 5-2)
> ***Please ignore patch (Version 6)***
> 
> I hope this is the easiest way for you to review it.

Well, the standard way is to send an incremental patch against the
latest upstream.  That is, just give a diff against 3.8-rc1 with a 
patch description about only the incremental patch -- i.e. which
problems in previous commits are fixed by the new patch.

BTW, I'm going to be on vacation until Jan. 2, so the reply will be
delayed.

Have a merry Christmas and new year.


thanks,

Takashi

> 
> It compiles, runs, and works on the hardware now without errors.
> 
> Thanks,
> Damien
> [2 patch_for-next_dz5.txt <text/plain; US-ASCII (base64)>]
> Support for Digidesign Mbox 2 USB sound card:
> 
> This patch is the result of a lot of trial and error, since there are no specs
> available for the device.
> 
> Full duplex support is provided, i.e. playback and recording in stereo.
> The format is hardcoded at 48000Hz @ 24 bit, which is the maximum that the
> device supports.  Also, MIDI in and MIDI out both work.
> 
> Users will notice that the S/PDIF light also flashes when playback or recording
> is active.  I believe this means that S/PDIF input/output is simultaneously
> activated with the analogue i/o during use.
> But this particular functionality remains untested.
> 
> Note that this particular version of the patch is so far untested on the
> physical hardware because I have not compiled a full kernel with the changes.
> However, extensive testing has been done by many users of the hardware
> who believe other versions of my patch have worked since circa 2009.
> 
> Signed-off-by: Damien Zammit <damien at zamaudio.com>
> 
> ---
> 
> diff --git a/sound/usb/midi.c b/sound/usb/midi.c
> index 34b9bb7..c183d34 100644
> --- a/sound/usb/midi.c
> +++ b/sound/usb/midi.c
> @@ -2181,6 +2181,10 @@ int snd_usbmidi_create(struct snd_card *card,
>  		umidi->usb_protocol_ops = &snd_usbmidi_novation_ops;
>  		err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
>  		break;
> +	case QUIRK_MIDI_MBOX2:
> +		umidi->usb_protocol_ops = &snd_usbmidi_midiman_ops;
> +		err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
> +		break;
>  	case QUIRK_MIDI_RAW_BYTES:
>  		umidi->usb_protocol_ops = &snd_usbmidi_raw_ops;
>  		/*
> diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
> index 579cf6f..cdcf6b4 100644
> --- a/sound/usb/quirks-table.h
> +++ b/sound/usb/quirks-table.h
> @@ -2921,6 +2921,93 @@ YAMAHA_DEVICE(0x7010, "UB99"),
>  
>  	}
>  },
> +
> +/* DIGIDESIGN MBOX 2 */
> +{
> +	USB_DEVICE(0x0dba, 0x3000),
> +	.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
> +		.vendor_name = "Digidesign",
> +		.product_name = "Mbox 2",
> +		.ifnum = QUIRK_ANY_INTERFACE,
> +		.type = QUIRK_COMPOSITE,
> +		.data = (const struct snd_usb_audio_quirk[]) {
> +			{
> +				.ifnum = 0,
> +				.type = QUIRK_IGNORE_INTERFACE
> +			},
> +			{
> +				.ifnum = 1,
> +				.type = QUIRK_IGNORE_INTERFACE
> +			},
> +			{
> +				.ifnum = 2,
> +				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
> +				.data = &(const struct audioformat) {
> +					.formats = SNDRV_PCM_FMTBIT_S24_3BE,
> +					.channels = 2,
> +					.iface = 2,
> +					.altsetting = 2,
> +					.altset_idx = 1,
> +					.attributes = 0x00,
> +					.endpoint = 0x03,
> +					.ep_attr = USB_ENDPOINT_SYNC_ASYNC,
> +					.maxpacksize = 0x128,
> +					.rates = SNDRV_PCM_RATE_48000,
> +					.rate_min = 48000,
> +					.rate_max = 48000,
> +					.nr_rates = 1,
> +					.rate_table = (unsigned int[]) {
> +						48000
> +					}
> +				}
> +			},
> +			{
> +				.ifnum = 3,
> +				.type = QUIRK_IGNORE_INTERFACE
> +			},
> +			{
> +				.ifnum = 4,
> +				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
> +				.data = &(const struct audioformat) {
> +				.formats = SNDRV_PCM_FMTBIT_S24_3BE,
> +					.channels = 2,
> +					.iface = 4,
> +					.altsetting = 2,
> +					.altset_idx = 1,
> +					.attributes = UAC_EP_CS_ATTR_SAMPLE_RATE,
> +					.endpoint = 0x85,
> +					.ep_attr = USB_ENDPOINT_SYNC_SYNC,
> +					.maxpacksize = 0x128,
> +					.rates = SNDRV_PCM_RATE_48000,
> +					.rate_min = 48000,
> +					.rate_max = 48000,
> +					.nr_rates = 1,
> +					.rate_table = (unsigned int[]) {
> +						48000
> +					}
> +				}
> +			},
> +			{
> +				.ifnum = 5,
> +				.type = QUIRK_IGNORE_INTERFACE
> +			},
> +			{
> +				.ifnum = 6,
> +				.type = QUIRK_MIDI_MBOX2,
> +				.data = &(const struct snd_usb_midi_endpoint_info) {
> +					.out_ep =  0x02,
> +					.out_cables = 0x0001,
> +					.in_ep = 0x81,
> +					.in_interval = 0x01,
> +					.in_cables = 0x0001
> +				}
> +			},
> +			{
> +				.ifnum = -1
> +			}
> +		}
> +	}
> +},
>  {
>  	/* Tascam US122 MKII - playback-only support */
>  	.match_flags = USB_DEVICE_ID_MATCH_DEVICE,
> diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
> index 0f58b4b..8f23af5 100644
> --- a/sound/usb/quirks.c
> +++ b/sound/usb/quirks.c
> @@ -306,6 +306,7 @@ int snd_usb_create_quirk(struct snd_usb_audio *chip,
>  		[QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,
>  		[QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk,
>  		[QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
> +		[QUIRK_MIDI_MBOX2] = create_any_midi_quirk,
>  		[QUIRK_MIDI_RAW_BYTES] = create_any_midi_quirk,
>  		[QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
>  		[QUIRK_MIDI_CME] = create_any_midi_quirk,
> @@ -655,6 +656,10 @@ int snd_usb_apply_boot_quirk(struct usb_device *dev,
>  	case USB_ID(0x0ccd, 0x00b1): /* Terratec Aureon 7.1 USB */
>  		return snd_usb_cm6206_boot_quirk(dev);
>  
> +	case USB_ID(0x0dba, 0x3000):
> +		/* Digidesign Mbox 2 */
> +		return snd_usb_mbox2_boot_quirk(dev);
> +
>  	case USB_ID(0x133e, 0x0815):
>  		/* Access Music VirusTI Desktop */
>  		return snd_usb_accessmusic_boot_quirk(dev);
> @@ -761,6 +766,92 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
>  	}
>  }
>  
> +static void mbox2_setup_48_24_magic(struct usb_device *dev)
> +{
> +	u8 srate[3];
> +	u8 temp[12];
> +
> +	/* Choose 48000Hz permanently */
> +	srate[0] = 0x80;
> +	srate[1] = 0xbb;
> +	srate[2] = 0x00;
> +
> +	/* Send the magic! */
> +	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
> +		0x01, 0x22, 0x0100, 0x0085, &temp, 0x0003);
> +	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
> +		0x81, 0xa2, 0x0100, 0x0085, &srate, 0x0003);
> +	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
> +		0x81, 0xa2, 0x0100, 0x0086, &srate, 0x0003);
> +	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
> +		0x81, 0xa2, 0x0100, 0x0003, &srate, 0x0003);
> +	return;
> +}
> +
> +/* Digidesign Mbox 2 needs to load firmware onboard
> + * and driver must wait a few seconds for initialisation.
> + */
> +
> +#define MBOX2_FIRMWARE_SIZE    646
> +#define MBOX2_BOOT_LOADING     0x01 /* Hard coded into the device */
> +#define MBOX2_BOOT_READY       0x02 /* Hard coded into the device */
> +
> +int snd_usb_mbox2_boot_quirk(struct usb_device *dev)
> +{
> +	struct usb_host_config *config = dev->actconfig;
> +	int err;
> +	u8 bootresponse;
> +	int fwsize;
> +	int count;
> +
> +	fwsize = le16_to_cpu(get_cfg_desc(config)->wTotalLength);
> +
> +	if (fwsize != MBOX2_FIRMWARE_SIZE) {
> +		snd_printk(KERN_ERR "usb-audio: Invalid firmware size=%d.\n", fwsize);
> +		return -ENODEV;
> +	}
> +
> +	snd_printd("usb-audio: Sending Digidesign Mbox 2 boot sequence...\n");
> +
> +	count = 0;
> +	bootresponse = MBOX2_BOOT_LOADING;
> +	while ((bootresponse == MBOX2_BOOT_LOADING) && (count < 10)) {
> +		msleep(500); /* 0.5 second delay */
> +		snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
> +			/* Control magic - load onboard firmware */
> +			0x85, 0xc0, 0x0001, 0x0000, &bootresponse, 0x0012);
> +		if (bootresponse == MBOX2_BOOT_READY)
> +			break;
> +		snd_printd("usb-audio: device not ready, resending boot sequence...\n");
> +		count++;
> +	}
> +
> +	if (bootresponse != MBOX2_BOOT_READY) {
> +		snd_printk(KERN_ERR "usb-audio: Unknown bootresponse=%d, or timed out, ignoring device.\n", bootresponse);
> +		return -ENODEV;
> +	}
> +
> +	snd_printdd("usb-audio: device initialised!\n");
> +
> +	err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
> +		&dev->descriptor, sizeof(dev->descriptor));
> +	config = dev->actconfig;
> +	if (err < 0)
> +		snd_printd("error usb_get_descriptor: %d\n", err);
> +
> +	err = usb_reset_configuration(dev);
> +	if (err < 0)
> +		snd_printd("error usb_reset_configuration: %d\n", err);
> +	snd_printdd("mbox2_boot: new boot length = %d\n",
> +		le16_to_cpu(get_cfg_desc(config)->wTotalLength));
> +
> +	mbox2_setup_48_24_magic(dev);
> +
> +	snd_printk(KERN_INFO "usb-audio: Digidesign Mbox 2: 24bit 48kHz");
> +
> +	return 0; /* Successful boot */
> +}
> +
>  void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep)
>  {
>  	/*
> diff --git a/sound/usb/quirks.h b/sound/usb/quirks.h
> index 0ca9e91..e7e9530 100644
> --- a/sound/usb/quirks.h
> +++ b/sound/usb/quirks.h
> @@ -24,6 +24,8 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
>  int snd_usb_is_big_endian_format(struct snd_usb_audio *chip,
>  				 struct audioformat *fp);
>  
> +int snd_usb_mbox2_boot_quirk(struct usb_device *dev);
> +
>  void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep);
>  
>  void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
> diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
> index 1ac3fd9..a8172c1 100644
> --- a/sound/usb/usbaudio.h
> +++ b/sound/usb/usbaudio.h
> @@ -76,6 +76,7 @@ enum quirk_type {
>  	QUIRK_MIDI_YAMAHA,
>  	QUIRK_MIDI_MIDIMAN,
>  	QUIRK_MIDI_NOVATION,
> +	QUIRK_MIDI_MBOX2,
>  	QUIRK_MIDI_RAW_BYTES,
>  	QUIRK_MIDI_EMAGIC,
>  	QUIRK_MIDI_CME,
> [3 patch_for-next_dz5-2.txt <text/plain; US-ASCII (base64)>]
> diff --git a/sound/usb/midi.c b/sound/usb/midi.c
> index c183d34..34b9bb7 100644
> --- a/sound/usb/midi.c
> +++ b/sound/usb/midi.c
> @@ -2181,10 +2181,6 @@ int snd_usbmidi_create(struct snd_card *card,
>  		umidi->usb_protocol_ops = &snd_usbmidi_novation_ops;
>  		err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
>  		break;
> -	case QUIRK_MIDI_MBOX2:
> -		umidi->usb_protocol_ops = &snd_usbmidi_midiman_ops;
> -		err = snd_usbmidi_detect_per_port_endpoints(umidi, endpoints);
> -		break;
>  	case QUIRK_MIDI_RAW_BYTES:
>  		umidi->usb_protocol_ops = &snd_usbmidi_raw_ops;
>  		/*
> diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
> index cdcf6b4..95e3326 100644
> --- a/sound/usb/quirks-table.h
> +++ b/sound/usb/quirks-table.h
> @@ -2993,7 +2993,7 @@ YAMAHA_DEVICE(0x7010, "UB99"),
>  			},
>  			{
>  				.ifnum = 6,
> -				.type = QUIRK_MIDI_MBOX2,
> +				.type = QUIRK_MIDI_MIDIMAN,
>  				.data = &(const struct snd_usb_midi_endpoint_info) {
>  					.out_ep =  0x02,
>  					.out_cables = 0x0001,
> diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
> index 8f23af5..dc96696 100644
> --- a/sound/usb/quirks.c
> +++ b/sound/usb/quirks.c
> @@ -306,7 +306,6 @@ int snd_usb_create_quirk(struct snd_usb_audio *chip,
>  		[QUIRK_MIDI_YAMAHA] = create_any_midi_quirk,
>  		[QUIRK_MIDI_MIDIMAN] = create_any_midi_quirk,
>  		[QUIRK_MIDI_NOVATION] = create_any_midi_quirk,
> -		[QUIRK_MIDI_MBOX2] = create_any_midi_quirk,
>  		[QUIRK_MIDI_RAW_BYTES] = create_any_midi_quirk,
>  		[QUIRK_MIDI_EMAGIC] = create_any_midi_quirk,
>  		[QUIRK_MIDI_CME] = create_any_midi_quirk,
> @@ -498,6 +497,92 @@ static int snd_usb_nativeinstruments_boot_quirk(struct usb_device *dev)
>  	return -EAGAIN;
>  }
>  
> +static void mbox2_setup_48_24_magic(struct usb_device *dev)
> +{
> +	u8 srate[3];
> +	u8 temp[12];
> +
> +	/* Choose 48000Hz permanently */
> +	srate[0] = 0x80;
> +	srate[1] = 0xbb;
> +	srate[2] = 0x00;
> +
> +	/* Send the magic! */
> +	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
> +		0x01, 0x22, 0x0100, 0x0085, &temp, 0x0003);
> +	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
> +		0x81, 0xa2, 0x0100, 0x0085, &srate, 0x0003);
> +	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
> +		0x81, 0xa2, 0x0100, 0x0086, &srate, 0x0003);
> +	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
> +		0x81, 0xa2, 0x0100, 0x0003, &srate, 0x0003);
> +	return;
> +}
> +
> +/* Digidesign Mbox 2 needs to load firmware onboard
> + * and driver must wait a few seconds for initialisation.
> + */
> +
> +#define MBOX2_FIRMWARE_SIZE    646
> +#define MBOX2_BOOT_LOADING     0x01 /* Hard coded into the device */
> +#define MBOX2_BOOT_READY       0x02 /* Hard coded into the device */
> +
> +static int snd_usb_mbox2_boot_quirk(struct usb_device *dev)
> +{
> +	struct usb_host_config *config = dev->actconfig;
> +	int err;
> +	u8 bootresponse[12];
> +	int fwsize;
> +	int count;
> +
> +	fwsize = le16_to_cpu(get_cfg_desc(config)->wTotalLength);
> +
> +	if (fwsize != MBOX2_FIRMWARE_SIZE) {
> +		snd_printk(KERN_ERR "usb-audio: Invalid firmware size=%d.\n", fwsize);
> +		return -ENODEV;
> +	}
> +
> +	snd_printd("usb-audio: Sending Digidesign Mbox 2 boot sequence...\n");
> +
> +	count = 0;
> +	bootresponse[0] = MBOX2_BOOT_LOADING;
> +	while ((bootresponse[0] == MBOX2_BOOT_LOADING) && (count < 10)) {
> +		msleep(500); /* 0.5 second delay */
> +		snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
> +			/* Control magic - load onboard firmware */
> +			0x85, 0xc0, 0x0001, 0x0000, &bootresponse, 0x0012);
> +		if (bootresponse[0] == MBOX2_BOOT_READY)
> +			break;
> +		snd_printd("usb-audio: device not ready, resending boot sequence...\n");
> +		count++;
> +	}
> +
> +	if (bootresponse[0] != MBOX2_BOOT_READY) {
> +		snd_printk(KERN_ERR "usb-audio: Unknown bootresponse=%d, or timed out, ignoring device.\n", bootresponse[0]);
> +		return -ENODEV;
> +	}
> +
> +	snd_printdd("usb-audio: device initialised!\n");
> +
> +	err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
> +		&dev->descriptor, sizeof(dev->descriptor));
> +	config = dev->actconfig;
> +	if (err < 0)
> +		snd_printd("error usb_get_descriptor: %d\n", err);
> +
> +	err = usb_reset_configuration(dev);
> +	if (err < 0)
> +		snd_printd("error usb_reset_configuration: %d\n", err);
> +	snd_printdd("mbox2_boot: new boot length = %d\n",
> +		le16_to_cpu(get_cfg_desc(config)->wTotalLength));
> +
> +	mbox2_setup_48_24_magic(dev);
> +
> +	snd_printk(KERN_INFO "usb-audio: Digidesign Mbox 2: 24bit 48kHz");
> +
> +	return 0; /* Successful boot */
> +}
> +
>  /*
>   * Setup quirks
>   */
> @@ -574,7 +659,6 @@ static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
>  	return 0; /* keep this altsetting */
>  }
>  
> -
>  static int fasttrackpro_skip_setting_quirk(struct snd_usb_audio *chip,
>  					   int iface, int altno)
>  {
> @@ -766,92 +850,6 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
>  	}
>  }
>  
> -static void mbox2_setup_48_24_magic(struct usb_device *dev)
> -{
> -	u8 srate[3];
> -	u8 temp[12];
> -
> -	/* Choose 48000Hz permanently */
> -	srate[0] = 0x80;
> -	srate[1] = 0xbb;
> -	srate[2] = 0x00;
> -
> -	/* Send the magic! */
> -	snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
> -		0x01, 0x22, 0x0100, 0x0085, &temp, 0x0003);
> -	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
> -		0x81, 0xa2, 0x0100, 0x0085, &srate, 0x0003);
> -	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
> -		0x81, 0xa2, 0x0100, 0x0086, &srate, 0x0003);
> -	snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0),
> -		0x81, 0xa2, 0x0100, 0x0003, &srate, 0x0003);
> -	return;
> -}
> -
> -/* Digidesign Mbox 2 needs to load firmware onboard
> - * and driver must wait a few seconds for initialisation.
> - */
> -
> -#define MBOX2_FIRMWARE_SIZE    646
> -#define MBOX2_BOOT_LOADING     0x01 /* Hard coded into the device */
> -#define MBOX2_BOOT_READY       0x02 /* Hard coded into the device */
> -
> -int snd_usb_mbox2_boot_quirk(struct usb_device *dev)
> -{
> -	struct usb_host_config *config = dev->actconfig;
> -	int err;
> -	u8 bootresponse;
> -	int fwsize;
> -	int count;
> -
> -	fwsize = le16_to_cpu(get_cfg_desc(config)->wTotalLength);
> -
> -	if (fwsize != MBOX2_FIRMWARE_SIZE) {
> -		snd_printk(KERN_ERR "usb-audio: Invalid firmware size=%d.\n", fwsize);
> -		return -ENODEV;
> -	}
> -
> -	snd_printd("usb-audio: Sending Digidesign Mbox 2 boot sequence...\n");
> -
> -	count = 0;
> -	bootresponse = MBOX2_BOOT_LOADING;
> -	while ((bootresponse == MBOX2_BOOT_LOADING) && (count < 10)) {
> -		msleep(500); /* 0.5 second delay */
> -		snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0),
> -			/* Control magic - load onboard firmware */
> -			0x85, 0xc0, 0x0001, 0x0000, &bootresponse, 0x0012);
> -		if (bootresponse == MBOX2_BOOT_READY)
> -			break;
> -		snd_printd("usb-audio: device not ready, resending boot sequence...\n");
> -		count++;
> -	}
> -
> -	if (bootresponse != MBOX2_BOOT_READY) {
> -		snd_printk(KERN_ERR "usb-audio: Unknown bootresponse=%d, or timed out, ignoring device.\n", bootresponse);
> -		return -ENODEV;
> -	}
> -
> -	snd_printdd("usb-audio: device initialised!\n");
> -
> -	err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
> -		&dev->descriptor, sizeof(dev->descriptor));
> -	config = dev->actconfig;
> -	if (err < 0)
> -		snd_printd("error usb_get_descriptor: %d\n", err);
> -
> -	err = usb_reset_configuration(dev);
> -	if (err < 0)
> -		snd_printd("error usb_reset_configuration: %d\n", err);
> -	snd_printdd("mbox2_boot: new boot length = %d\n",
> -		le16_to_cpu(get_cfg_desc(config)->wTotalLength));
> -
> -	mbox2_setup_48_24_magic(dev);
> -
> -	snd_printk(KERN_INFO "usb-audio: Digidesign Mbox 2: 24bit 48kHz");
> -
> -	return 0; /* Successful boot */
> -}
> -
>  void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep)
>  {
>  	/*
> diff --git a/sound/usb/quirks.h b/sound/usb/quirks.h
> index e7e9530..0ca9e91 100644
> --- a/sound/usb/quirks.h
> +++ b/sound/usb/quirks.h
> @@ -24,8 +24,6 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
>  int snd_usb_is_big_endian_format(struct snd_usb_audio *chip,
>  				 struct audioformat *fp);
>  
> -int snd_usb_mbox2_boot_quirk(struct usb_device *dev);
> -
>  void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep);
>  
>  void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,


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