linux-kernel - Re: [PATCH] i2c: tiny-usb: check usb base class before assuming the interface on device is for this driver

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Message-ID: <20230727171345.7u53kcfeadubvvlq@intel.intel>
Date:   Thu, 27 Jul 2023 19:13:45 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Harry Geyer <harry.geyer@...tank.co.uk>
Cc:     Till Harbaum <till@...baum.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: tiny-usb: check usb base class before assuming the
 interface on device is for this driver

Hi Harry,

On Thu, Jul 27, 2023 at 05:22:55PM +0100, Harry Geyer wrote:
> Patch allows usb devices with multiple interfaces to use this driver without
> this driver assuming all interfaces are i2c-tiny-usb.
> 
> Signed-off-by: Harry Geyer <harry.geyer@...tank.co.uk>
> ---
>  drivers/i2c/busses/i2c-tiny-usb.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-tiny-usb.c b/drivers/i2c/busses/i2c-tiny-usb.c
> index d1fa9ff5aeab..1bffe36c40ad 100644
> --- a/drivers/i2c/busses/i2c-tiny-usb.c
> +++ b/drivers/i2c/busses/i2c-tiny-usb.c
> @@ -222,6 +222,10 @@ static int i2c_tiny_usb_probe(struct usb_interface *interface,
>  	int retval = -ENOMEM;
>  	u16 version;
>  
> +	if (interface->intf_assoc &&
> +	    interface->intf_assoc->bFunctionClass != USB_CLASS_VENDOR_SPEC)
> +		return -ENODEV;
> +

Thanks for resending it!

Reviewed-by: Andi Shyti <andi.shyti@...nel.org> 

Andi