linux-kernel - Re: [PATCH] USB: serial: option: adding support for OPPO R11 diag port

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Date:   Fri, 15 Jul 2022 18:08:58 +0800
From:   sdlyyxy <sdlyyxy@...t.edu.cn>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     johan@...nel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: serial: option: adding support for OPPO R11 diag
 port


> On Jul 15, 2022, at 14:53, Greg KH <gregkh@...uxfoundation.org> wrote:
> 
> On Fri, Jul 15, 2022 at 08:45:34AM +0200, Greg KH wrote:
>> On Fri, Jul 15, 2022 at 02:39:06PM +0800, sdlyyxy wrote:
>>> Hi Greg,
>>> Thanks for your comments!
>>> 
>>>> On Jul 14, 2022, at 18:56, Greg KH <gregkh@...uxfoundation.org> wrote:
>>>> 
>>>> On Thu, Jul 14, 2022 at 06:20:37PM +0800, sdlyyxy wrote:
>>>>> From: Yan Xinyu <sdlyyxy@...t.edu.cn>
>>>>> 
>>>>> This patch adds support for OPPO R11 USB diag serial port to option
>>>>> driver. This phone uses Qualcomm Snapdragon 660 SoC.
>>>>> 
>>>>> usb-devices output:
>>>>> T: Bus=03 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 10 Spd=480 MxCh= 0
>>>>> D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
>>>>> P: Vendor=22d9 ProdID=276c Rev=04.04
>>>>> S: Manufacturer=OPPO
>>>>> S: Product=SDM660-MTP _SN:09C6BCA7
>>>>> S: SerialNumber=beb2c403
>>>>> C: #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=500mA
>>>>> I: If#=0x0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=30 Driver=option
>>>> 
>>>> I do not think this has an option usb-serial chip in the device, this is
>>>> a phone with a debug port instead.
>>>> 
>>> Yeah, this phone uses a Qualcomm chip, not an option usb-serial chip.
>>> It has the functionality to enter into a special mode, which provides 
>>> a QCDM-capable diag port as the same behaviour of USB modems. For
>>> Qualcomm devices, there are several drivers: qcserial, qcaux, and 
>>> option. According to qcserial.c, qcaux.c source code and mailing list
>>> conversations [1], this device with diag+adb layout should be driven
>>> by option.
>> 
>> No, this is not an option chip, and does not follow the option device
>> protocols at all.  So this is not the driver to use here.
>> 
>> We should probably switch those other devices as well, they aren't
>> really option devices either.
>> 
>>>>> I: If#=0x1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=usbfs
>>>> 
>>>> What userspace program is bound to this endpoint?
>>>> 
>>> I think it is used by adb via libusb.
>>>>> 
>>>>> Signed-off-by: Yan Xinyu <sdlyyxy@...t.edu.cn>
>>>>> ---
>>>>> drivers/usb/serial/option.c | 5 +++++
>>>>> 1 file changed, 5 insertions(+)
>>>>> 
>>>>> diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
>>>>> index de59fa919540..cf65cb84c3ca 100644
>>>>> --- a/drivers/usb/serial/option.c
>>>>> +++ b/drivers/usb/serial/option.c
>>>>> @@ -573,6 +573,10 @@ static void option_instat_callback(struct urb *urb);
>>>>> #define WETELECOM_PRODUCT_6802			0x6802
>>>>> #define WETELECOM_PRODUCT_WMD300		0x6803
>>>>> 
>>>>> +/* OPPO products */
>>>>> +#define OPPO_VENDOR_ID				0x22d9
>>>>> +#define OPPO_PRODUCT_R11			0x276c
>>>>> +
>>>>> 
>>>>> /* Device flags */
>>>>> 
>>>>> @@ -2155,6 +2159,7 @@ static const struct usb_device_id option_ids[] = {
>>>>> 	{ USB_DEVICE_INTERFACE_CLASS(0x305a, 0x1404, 0xff) },			/* GosunCn GM500 RNDIS */
>>>>> 	{ USB_DEVICE_INTERFACE_CLASS(0x305a, 0x1405, 0xff) },			/* GosunCn GM500 MBIM */
>>>>> 	{ USB_DEVICE_INTERFACE_CLASS(0x305a, 0x1406, 0xff) },			/* GosunCn GM500 ECM/NCM */
>>>>> +	{ USB_DEVICE_AND_INTERFACE_INFO(OPPO_VENDOR_ID, OPPO_PRODUCT_R11, 0xff, 0xff, 0x30) },
>>>> 
>>>> This does not look correct, sorry. Try using the usbserial generic
>>>> driver instead to transmit and recieve?
>>>> 
>>> Yes I have tried using usbserial generic driver. As for the interface
>>> #0x0 diag port, it seems working. However, in the same time the 
>>> generic driver will also be attached to interface #0x1, which causes
>>> nonfunction of adb. Using this patch, diag and adb can run 
>>> simultaneously. So it's better than the generic driver?
>> 
>> Ah, we should just bind the simple usb-serial driver to this interface
>> and not bind the generic usb-serial driver to this interface.
>> 
>> Let me make up a simple patch for this for you to test...
> 
> Can you try the patch here for this, it should work the same as your
> patch:
> 
> 
> diff --git a/drivers/usb/serial/usb-serial-simple.c b/drivers/usb/serial/usb-serial-simple.c
> index 4c6747889a19..eb832b94aa3a 100644
> --- a/drivers/usb/serial/usb-serial-simple.c
> +++ b/drivers/usb/serial/usb-serial-simple.c
> @@ -60,7 +60,9 @@ DEVICE(flashloader, FLASHLOADER_IDS);
> 	{ USB_VENDOR_AND_INTERFACE_INFO(0x18d1,			\
> 					USB_CLASS_VENDOR_SPEC,	\
> 					0x50,			\
> -					0x01) }
> +					0x01) },		\
> +	{ USB_DEVICE_AND_INTERFACE_INFO(0x22d9, 0x276c,		\
> +					0xff, 0xff, 0x30) }
> DEVICE(google, GOOGLE_IDS);
> 
> /* Libtransistor USB console */
> 
Great, this patch works as intended. The VendorID 0x22d9 does not
belong to Google, shall I add a separate section for OPPO in 
usb-serial-simple.c and create a new patch?

Thanks,
sdlyyxy