[alsa-devel] [PATCH] ALSA: usb-audio: Add boot quirk for MOTU M Series

[Takashi Iwai]

On Sun, 12 Jan 2020 00:34:46 +0100,
Alexander Tsoy wrote:
> 
> Add delay to make sure that audio urbs are not sent too early.
> Otherwise the device hangs. Windows driver makes ~2s delay, so use
> about the same time delay value.
> 
> snd_usb_apply_boot_quirk() is called 3 times for my MOTU M4, which
> is an overkill. Thus a quirk that is called only once is implemented.
> 
> Also send two vendor-specific control messages before and after
> the delay. This behaviour is blindly copied from the Windows driver.
> 
> Signed-off-by: Alexander Tsoy <alexander at tsoy.me>

The code change looks OK, but I get a lot of errors from
scripts/checkpatch.pl regarding the spaces.
Could you resubmit with those fixes?


thanks,

Takashi

> ---
>  sound/usb/card.c   |  4 ++++
>  sound/usb/quirks.c | 38 ++++++++++++++++++++++++++++++++++++++
>  sound/usb/quirks.h |  5 +++++
>  3 files changed, 47 insertions(+)
> 
> diff --git a/sound/usb/card.c b/sound/usb/card.c
> index 9f743ebae615..2f582ac7cf78 100644
> --- a/sound/usb/card.c
> +++ b/sound/usb/card.c
> @@ -600,6 +600,10 @@ static int usb_audio_probe(struct usb_interface *intf,
>  		}
>  	}
>  	if (! chip) {
> +		err = snd_usb_apply_boot_quirk_once(dev, intf, quirk, id);
> +		if (err < 0)
> +			return err;
> +
>  		/* it's a fresh one.
>  		 * now look for an empty slot and create a new card instance
>  		 */
> diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
> index 82184036437b..c93c53126243 100644
> --- a/sound/usb/quirks.c
> +++ b/sound/usb/quirks.c
> @@ -1113,6 +1113,31 @@ static int snd_usb_motu_microbookii_boot_quirk(struct usb_device *dev)
>  	return err;
>  }
>  
> +static int snd_usb_motu_m_series_boot_quirk(struct usb_device *dev)
> +{
> +	int ret;
> +
> +	if (snd_usb_pipe_sanity_check(dev, usb_sndctrlpipe(dev, 0)))
> +		return -EINVAL;
> +	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
> +			      1, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
> +			      0x0, 0, NULL, 0, 1000);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	msleep(2000);
> +
> +	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
> +			      1, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
> +			      0x20, 0, NULL, 0, 1000);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
>  /*
>   * Setup quirks
>   */
> @@ -1297,6 +1322,19 @@ int snd_usb_apply_boot_quirk(struct usb_device *dev,
>  	return 0;
>  }
>  
> +int snd_usb_apply_boot_quirk_once(struct usb_device *dev,
> +			          struct usb_interface *intf,
> +			          const struct snd_usb_audio_quirk *quirk,
> +			          unsigned int id)
> +{
> +	switch (id) {
> +	case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
> +		return snd_usb_motu_m_series_boot_quirk(dev);
> +	}
> +
> +	return 0;
> +}
> +
>  /*
>   * check if the device uses big-endian samples
>   */
> diff --git a/sound/usb/quirks.h b/sound/usb/quirks.h
> index a80e0ddd0736..fa83a98ad7bb 100644
> --- a/sound/usb/quirks.h
> +++ b/sound/usb/quirks.h
> @@ -20,6 +20,11 @@ int snd_usb_apply_boot_quirk(struct usb_device *dev,
>  			     const struct snd_usb_audio_quirk *quirk,
>  			     unsigned int usb_id);
>  
> +int snd_usb_apply_boot_quirk_once(struct usb_device *dev,
> +			          struct usb_interface *intf,
> +			          const struct snd_usb_audio_quirk *quirk,
> +			          unsigned int usb_id);
> +
>  void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
>  			      struct audioformat *fmt);
>  
> -- 
> 2.24.1
>