USB: serial: usb_wwan: replace DTR/RTS magic numbers with macros

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: sdlyyxy <sdlyyxy@bupt.edu.cn>
---
 drivers/usb/serial/usb_wwan.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

On Thu, Jul 21, 2022 at 11:23:35PM +0800, sdlyyxy 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: sdlyyxy <sdlyyxy@bupt.edu.cn>
> ---
>  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
> +
>  /*
>   * Generate DTR/RTS signals on the port using the SET_CONTROL_LINE_STATE request
>   * in CDC ACM.
> @@ -48,9 +52,9 @@ static int usb_wwan_send_setup(struct usb_serial_port *port)
>  	portdata = usb_get_serial_port_data(port);
>  
>  	if (portdata->dtr_state)
> -		val |= 0x01;
> +		val |= ACM_CTRL_DTR;
>  	if (portdata->rts_state)
> -		val |= 0x02;
> +		val |= ACM_CTRL_RTS;
>  
>  	ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
>  
> @@ -59,8 +63,9 @@ static int usb_wwan_send_setup(struct usb_serial_port *port)
>  		return res;
>  
>  	res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
> -				0x22, 0x21, val, ifnum, NULL, 0,
> -				USB_CTRL_SET_TIMEOUT);
> +				USB_CDC_REQ_SET_CONTROL_LINE_STATE,
> +				USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
> +				val, ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
>  
>  	usb_autopm_put_interface(port->serial->interface);
>  
> -- 
> 2.25.1
> 
> 
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
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