linux-kernel - Re: [PATCH] USB: add USB_VENDOR_AND_INTERFACE

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Date:	Tue, 10 Jul 2012 19:03:49 -0300
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Gustavo Padovan <gustavo@...ovan.org>
Cc:	linux-bluetooth@...r.kernel.org,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] USB: add USB_VENDOR_AND_INTERFACE_INFO() macro

Hi Gustavo,

> A lot of Broadcom Bluetooth devices provides vendor specific interface
> class and we are getting flooded by patches adding new device support.
> This change will help us enable support for any other Broadcom with vendor
> specific device that arrives in the future.
> 
> Only the product id changes for those devices, so this macro would be
> perfect for us:
> 
> { USB_VENDOR_AND_INTERFACE_INFO(0x0a5c, 0xff, 0x01, 0x01) }
> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> ---
>  include/linux/usb.h |   21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/include/linux/usb.h b/include/linux/usb.h
> index dea39dc..dad156b 100644
> --- a/include/linux/usb.h
> +++ b/include/linux/usb.h
> @@ -829,6 +829,27 @@ static inline int usb_make_path(struct usb_device *dev, char *buf, size_t size)
>  	.bInterfaceSubClass = (sc), \
>  	.bInterfaceProtocol = (pr)
>  
> +/**
> + * USB_VENDOR_AND_INTERFACE_INFO - describe a specific usb vendor with a class of usb interfaces
> + * @vend: the 16 bit USB Vendor ID
> + * @cl: bInterfaceClass value
> + * @sc: bInterfaceSubClass value
> + * @pr: bInterfaceProtocol value
> + *
> + * This macro is used to create a struct usb_device_id that matches a
> + * specific vendor with a specific class of interfaces.
> + *
> + * This is especially useful when explicitly matching devices that have
> + * vendor specific bDeviceClass values, but standards-compliant interfaces.
> + */
> +#define USB_VENDOR_AND_INTERFACE_INFO(vend, cl, sc, pr) \
> +	.match_flags = USB_DEVICE_ID_MATCH_INT_INFO \
> +		| USB_DEVICE_ID_MATCH_DEVICE, \

this should be USB_DEVICE_ID_MATCH_VENDOR.

> +	.idVendor = (vend), \
> +	.bInterfaceClass = (cl), \
> +	.bInterfaceSubClass = (sc), \
> +	.bInterfaceProtocol = (pr)
> +
>  /* ----------------------------------------------------------------------- */
>  
>  /* Stuff for dynamic usb ids */

Regards

Marcel


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