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

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Message-Id: <20230719113838.17714-1-harry.geyer@devtank.co.uk>
Date:   Wed, 19 Jul 2023 12:38:38 +0100
From:   Harry Geyer <harry.geyer@...tank.co.uk>
To:     Till Harbaum <till@...baum.org>,
        Andi Shyti <andi.shyti@...nel.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     harry.geyer@...tank.co.uk
Subject: [PATCH] i2c: tiny-usb: check usb base class before assuming the interface on device is for this driver

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 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/i2c/busses/i2c-tiny-usb.c b/drivers/i2c/busses/i2c-tiny-usb.c
index d1fa9ff5aeab..fc194c65e50e 100644
--- a/drivers/i2c/busses/i2c-tiny-usb.c
+++ b/drivers/i2c/busses/i2c-tiny-usb.c
@@ -222,6 +222,11 @@ 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 */
-- 
2.34.1