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

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Date:   Fri, 15 Jul 2022 08:53:27 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     sdlyyxy <sdlyyxy@...t.edu.cn>
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 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 */