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Date:   Wed, 9 Feb 2022 15:27:01 +0100
From:   Johan Hovold <johan@kernel.org>
To:     Slark Xiao <slark_xiao@163.com>
Cc:     gregkh@linuxfoundation.org, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] USB: serial: option: add support for DW5829e
Message-ID: <YgPPNVzyg7Gypzv9@hovoldconsulting.com>
References: <20220209031535.9668-1-slark_xiao@163.com>
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On Wed, Feb 09, 2022 at 11:15:35AM +0800, Slark Xiao wrote:
> Dell DW5829e same as DW5821e except CAT level.
> DW5821e supports CAT16 but DW5829e supports CAT9.
> There are 2 types product of DW5829e: normal and eSIM.
> So we will add 2 PID for DW5829e.
> And for each PID, it support MBIM or RMNET.
> Let's see test evidence as below:
> 
> DW5829e MBIM mode:
> T:  Bus=04 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  4 Spd=5000 MxCh= 0
> D:  Ver= 3.10 Cls=ef(misc ) Sub=02 Prot=01 MxPS= 9 #Cfgs=  2
> P:  Vendor=413c ProdID=81e6 Rev=03.18
> S:  Manufacturer=Dell Inc.
> S:  Product=DW5829e Snapdragon X20 LTE
> S:  SerialNumber=0123456789ABCDEF
> C:  #Ifs= 7 Cfg#= 2 Atr=a0 MxPwr=896mA
> I:  If#=0x0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=0e Prot=00 Driver=cdc_mbim
> I:  If#=0x1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=02 Driver=cdc_mbim
> I:  If#=0x2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x5 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
> I:  If#=0x6 Alt= 0 #EPs= 1 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
> 
> DW5829e RMNET mode:
> T:  Bus=04 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  5 Spd=5000 MxCh= 0
> D:  Ver= 3.10 Cls=ef(misc ) Sub=02 Prot=01 MxPS= 9 #Cfgs=  1
> P:  Vendor=413c ProdID=81e6 Rev=03.18
> S:  Manufacturer=Dell Inc.
> S:  Product=DW5829e Snapdragon X20 LTE
> S:  SerialNumber=0123456789ABCDEF
> C:  #Ifs= 6 Cfg#= 1 Atr=a0 MxPwr=896mA
> I:  If#=0x0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
> I:  If#=0x1 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
> I:  If#=0x2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x5 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
> 
> DW5829e-eSIM MBIM mode:
> T:  Bus=04 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  6 Spd=5000 MxCh= 0
> D:  Ver= 3.10 Cls=ef(misc ) Sub=02 Prot=01 MxPS= 9 #Cfgs=  2
> P:  Vendor=413c ProdID=81e4 Rev=03.18
> S:  Manufacturer=Dell Inc.
> S:  Product=DW5829e-eSIM Snapdragon X20 LTE
> S:  SerialNumber=0123456789ABCDEF
> C:  #Ifs= 7 Cfg#= 2 Atr=a0 MxPwr=896mA
> I:  If#=0x0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=0e Prot=00 Driver=cdc_mbim
> I:  If#=0x1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=02 Driver=cdc_mbim
> I:  If#=0x2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x5 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
> I:  If#=0x6 Alt= 0 #EPs= 1 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
> 
> DW5829e-eSIM RMNET mode:
> T:  Bus=04 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  7 Spd=5000 MxCh= 0
> D:  Ver= 3.10 Cls=ef(misc ) Sub=02 Prot=01 MxPS= 9 #Cfgs=  1
> P:  Vendor=413c ProdID=81e4 Rev=03.18
> S:  Manufacturer=Dell Inc.
> S:  Product=DW5829e-eSIM Snapdragon X20 LTE
> S:  SerialNumber=0123456789ABCDEF
> C:  #Ifs= 6 Cfg#= 1 Atr=a0 MxPwr=896mA
> I:  If#=0x0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
> I:  If#=0x1 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
> I:  If#=0x2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> I:  If#=0x5 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
> 
> BTW, the interface 0x6 of MBIM mode is GNSS port, which not same as NMEA
> port. So it's banned from serial option driver.
> The remaining interfaces 0x2-0x5 are: MODEM, MODEM, NMEA, DIAG.
> 
> Signed-off-by: Slark Xiao <slark_xiao@163.com>

Thanks for providing all the necessary details.

> ---
>  drivers/usb/serial/option.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
> index 962e9943fc20..b47bad810eec 100644
> --- a/drivers/usb/serial/option.c
> +++ b/drivers/usb/serial/option.c
> @@ -198,6 +198,8 @@ static void option_instat_callback(struct urb *urb);
>  
>  #define DELL_PRODUCT_5821E			0x81d7
>  #define DELL_PRODUCT_5821E_ESIM			0x81e0
> +#define DELL_PRODUCT_5829E			0x81e6
> +#define DELL_PRODUCT_5829E_ESIM			0x81e4

Please keep the defines sorted by PID.

>  #define KYOCERA_VENDOR_ID			0x0c88
>  #define KYOCERA_PRODUCT_KPC650			0x17da
> @@ -1063,6 +1065,10 @@ static const struct usb_device_id option_ids[] = {
>  	  .driver_info = RSVD(0) | RSVD(1) | RSVD(6) },
>  	{ USB_DEVICE(DELL_VENDOR_ID, DELL_PRODUCT_5821E_ESIM),
>  	  .driver_info = RSVD(0) | RSVD(1) | RSVD(6) },
> +	{ USB_DEVICE_INTERFACE_CLASS(DELL_VENDOR_ID, DELL_PRODUCT_5829E, 0xff),
> +	  .driver_info = RSVD(6) },
> +	{ USB_DEVICE_INTERFACE_CLASS(DELL_VENDOR_ID, DELL_PRODUCT_5829E_ESIM, 0xff),
> +	  .driver_info = RSVD(6) },

It looks like these entries will cause the driver to bind also to the
QMI port however.

>  	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_E100A) },	/* ADU-E100, ADU-310 */
>  	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_500A) },
>  	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_620UW) },

Johan