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Date:   Fri, 26 Apr 2019 05:13:17 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Simon Horman <horms@...ge.net.au>
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 4/26/19 4:27 AM, Simon Horman wrote:
> 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?
> 

Sure, Apple may decide to use the same device/class/subclass/protocol
identifier for a different protocol. That is unlikely but possible.

If the associated risk is considered higher than the benefit of supporting
new devices announcing the same protocol with a different product id,
please feel free to ignore (or nack) this patch.

Thanks,
Guenter

>> 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
>>
> 

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