netdev - Re: [PATCH] usbnet: ipheth: Simplify device detection

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Date:   Fri, 26 Apr 2019 13:27:03 +0200
From:   Simon Horman <horms@...ge.net.au>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     "David S . Miller" <davem@...emloft.net>,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usbnet: ipheth: Simplify device detection

On Wed, Apr 24, 2019 at 10:58:24AM -0700, Guenter Roeck wrote:
> All Apple products use the same protocol for tethering over USB.
> To simplify the code and make it future proof, use
> USB_VENDOR_AND_INTERFACE_INFO() instead of
> USB_DEVICE_AND_INTERFACE_INFO() to automatically detect and support
> all existing and future Apple products using the same interface.

What if future Apple products behave differently?

> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> Tested with various iPads and iPhones up to X. iPhone 6 and later
> up to and including X all use product ID 0x12a8, so this patch is
> not strictly required, but it does simplify the code.
> 
>  drivers/net/usb/ipheth.c | 58 +++---------------------------------------------
>  1 file changed, 3 insertions(+), 55 deletions(-)
> 
> diff --git a/drivers/net/usb/ipheth.c b/drivers/net/usb/ipheth.c
> index 3d8a70d3ea9b..a01a71a7e48d 100644
> --- a/drivers/net/usb/ipheth.c
> +++ b/drivers/net/usb/ipheth.c
> @@ -54,17 +54,6 @@
>  #include <linux/workqueue.h>
>  
>  #define USB_VENDOR_APPLE        0x05ac
> -#define USB_PRODUCT_IPHONE      0x1290
> -#define USB_PRODUCT_IPHONE_3G   0x1292
> -#define USB_PRODUCT_IPHONE_3GS  0x1294
> -#define USB_PRODUCT_IPHONE_4	0x1297
> -#define USB_PRODUCT_IPAD 0x129a
> -#define USB_PRODUCT_IPAD_2	0x12a2
> -#define USB_PRODUCT_IPAD_3	0x12a6
> -#define USB_PRODUCT_IPAD_MINI    0x12ab
> -#define USB_PRODUCT_IPHONE_4_VZW 0x129c
> -#define USB_PRODUCT_IPHONE_4S	0x12a0
> -#define USB_PRODUCT_IPHONE_5	0x12a8
>  
>  #define IPHETH_USBINTF_CLASS    255
>  #define IPHETH_USBINTF_SUBCLASS 253
> @@ -88,50 +77,9 @@
>  #define IPHETH_CARRIER_ON       0x04
>  
>  static const struct usb_device_id ipheth_table[] = {
> -	{ USB_DEVICE_AND_INTERFACE_INFO(
> -		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE,
> -		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
> -		IPHETH_USBINTF_PROTO) },
> -	{ USB_DEVICE_AND_INTERFACE_INFO(
> -		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3G,
> -		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
> -		IPHETH_USBINTF_PROTO) },
> -	{ USB_DEVICE_AND_INTERFACE_INFO(
> -		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3GS,
> -		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
> -		IPHETH_USBINTF_PROTO) },
> -	{ USB_DEVICE_AND_INTERFACE_INFO(
> -		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4,
> -		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
> -		IPHETH_USBINTF_PROTO) },
> -	{ USB_DEVICE_AND_INTERFACE_INFO(
> -		USB_VENDOR_APPLE, USB_PRODUCT_IPAD,
> -		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
> -		IPHETH_USBINTF_PROTO) },
> -	{ USB_DEVICE_AND_INTERFACE_INFO(
> -		USB_VENDOR_APPLE, USB_PRODUCT_IPAD_2,
> -		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
> -		IPHETH_USBINTF_PROTO) },
> -	{ USB_DEVICE_AND_INTERFACE_INFO(
> -		USB_VENDOR_APPLE, USB_PRODUCT_IPAD_3,
> -		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
> -		IPHETH_USBINTF_PROTO) },
> -	{ USB_DEVICE_AND_INTERFACE_INFO(
> -		USB_VENDOR_APPLE, USB_PRODUCT_IPAD_MINI,
> -		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
> -		IPHETH_USBINTF_PROTO) },
> -	{ USB_DEVICE_AND_INTERFACE_INFO(
> -		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4_VZW,
> -		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
> -		IPHETH_USBINTF_PROTO) },
> -	{ USB_DEVICE_AND_INTERFACE_INFO(
> -		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4S,
> -		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
> -		IPHETH_USBINTF_PROTO) },
> -	{ USB_DEVICE_AND_INTERFACE_INFO(
> -		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_5,
> -		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
> -		IPHETH_USBINTF_PROTO) },
> +	{ USB_VENDOR_AND_INTERFACE_INFO(USB_VENDOR_APPLE, IPHETH_USBINTF_CLASS,
> +					IPHETH_USBINTF_SUBCLASS,
> +					IPHETH_USBINTF_PROTO) },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(usb, ipheth_table);
> -- 
> 2.7.4
>