i2c: tiny-usb: check usb base class before assuming the interface on device is for...

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@devtank.co.uk>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20230727162255.21551-1-harry.geyer@devtank.co.uk
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/busses/i2c-tiny-usb.c b/drivers/i2c/busses/i2c-tiny-usb.c
index d1fa9ff..1bffe36 100644 (file)
--- 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;
+
        dev_dbg(&interface->dev, "probing usb device\n");
 
        /* allocate memory for our device state and initialize it */