linux-kernel - Re: [PATCH v2] USB: serial: usb_wwan: replace DTR/RTS magic numbers with macros

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Date:   Fri, 22 Jul 2022 10:40:51 +0800
From:   Yan Xinyu <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 v2] USB: serial: usb_wwan: replace DTR/RTS magic numbers
 with macros

> On Jul 22, 2022, at 02:18, Greg KH <gregkh@...uxfoundation.org> wrote:
> 
> On Thu, Jul 21, 2022 at 11:52:57PM +0800, Yan Xinyu wrote:
>> The usb_wwan_send_setup function generates DTR/RTS signals in compliance
>> with CDC ACM standard. This patch changes magic numbers in this function
>> to equivalent macros.
>> 
>> Signed-off-by: Yan Xinyu <sdlyyxy@...t.edu.cn>
>> ---
>> v1->v2:
>> * Fix Signed-off-by name.
>> ---
>> drivers/usb/serial/usb_wwan.c | 13 +++++++++----
>> 1 file changed, 9 insertions(+), 4 deletions(-)
>> 
>> diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
>> index dab38b63eaf7..a6bd6144702d 100644
>> --- a/drivers/usb/serial/usb_wwan.c
>> +++ b/drivers/usb/serial/usb_wwan.c
>> @@ -29,10 +29,14 @@
>> #include <linux/bitops.h>
>> #include <linux/uaccess.h>
>> #include <linux/usb.h>
>> +#include <linux/usb/cdc.h>
>> #include <linux/usb/serial.h>
>> #include <linux/serial.h>
>> #include "usb-wwan.h"
>> 
>> +#define ACM_CTRL_DTR 0x01
>> +#define ACM_CTRL_RTS 0x02
> 
> Why are these not in the cdc.h file already?

These are defined in the drivers/usb/class/cdc-acm.h file. Is it safe
to include it?

Thanks,
sdlyyxy