linux-kernel - Re: [PATCH] USB: serial: option: add Quectel EM05-G modem

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Message-ID: <YrBuqTQObu7/vAf0@hovoldconsulting.com>
Date:   Mon, 20 Jun 2022 14:57:13 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Yonglin Tan <yonglin.tan@...look.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: serial: option: add Quectel EM05-G modem

On Mon, Jun 20, 2022 at 08:16:53PM +0800, Yonglin Tan wrote:
> Add a device-id entry for the Quectel EM05-G module.
> 
> T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 16 Spd=480  MxCh= 0
> D:  Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs=  1
> P:  Vendor=2c7c ProdID=030a Rev= 3.18
> S:  Manufacturer=Quectel
> S:  Product=Quectel EM05-G
> C:* #Ifs= 6 Cfg#= 1 Atr=a0 MxPwr=500mA
> A:  FirstIf#= 0 IfCount= 2 Cls=02(comm.) Sub=0e Prot=00
> I:* If#= 3 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
> E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> E:  Ad=83(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
> E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> E:  Ad=85(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
> E:  Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E:  Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 5 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> E:  Ad=87(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
> E:  Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E:  Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=0e Prot=00 Driver=cdc_mbim
> E:  Ad=89(I) Atr=03(Int.) MxPS=  64 Ivl=32ms
> I:  If#= 1 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=02 Driver=cdc_mbim
> I:* If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=02 Driver=cdc_mbim
> E:  Ad=88(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E:  Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

Are there any further configurations for this device that you need to
consider?

You reserve interface 6 below which doesn't even exist in the above
configuration.

Can you say something more about what the individual interfaces are used
for, for example, as was done here:

	https://lore.kernel.org/all/TYZPR06MB4270D3394B8E3E0301738F6B86D09@TYZPR06MB4270.apcprd06.prod.outlook.com/

> Signed-off-by: Yonglin Tan <yonglin.tan@...look.com>
> ---
>  drivers/usb/serial/option.c | 2 ++
>  1 file changed, 2 insertions(+)
>  mode change 100644 => 100755 drivers/usb/serial/option.c
> 
> diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
> old mode 100644
> new mode 100755
> index ed1e50d..05fc322
> --- a/drivers/usb/serial/option.c
> +++ b/drivers/usb/serial/option.c
> @@ -1147,6 +1147,8 @@ static const struct usb_device_id option_ids[] = {
>  	  .driver_info = ZLP },
>  	{ USB_DEVICE_AND_INTERFACE_INFO(QUECTEL_VENDOR_ID, QUECTEL_PRODUCT_EC200S_CN, 0xff, 0, 0) },
>  	{ USB_DEVICE_AND_INTERFACE_INFO(QUECTEL_VENDOR_ID, QUECTEL_PRODUCT_EC200T, 0xff, 0, 0) },
> +	{ USB_DEVICE_INTERFACE_CLASS(QUECTEL_VENDOR_ID, 0x030a, 0xff),
> +	  .driver_info = RSVD(6) | ZLP }, /* EM05-G */

As mentioned above RSVD(6) looks wrong here.

Please move the comment to the first line of the entry, and move the
entry to the other Quectel entries using numerical PIDs (i.e. before
EM160R-GL).
  
>  	{ USB_DEVICE(CMOTECH_VENDOR_ID, CMOTECH_PRODUCT_6001) },
>  	{ USB_DEVICE(CMOTECH_VENDOR_ID, CMOTECH_PRODUCT_CMU_300) },

Johan