Commit 4e33059e authored by Michael Walle's avatar Michael Walle Committed by Greg Kroah-Hartman
Browse files

usb: gadget: u_serial: add .get_icount() support 



Add icount support for the transmitting and receiving characters. This
will make the tty LED trigger work with the ttyGS devices.

Signed-off-by: default avatarMichael Walle <mwalle@kernel.org>
Link: https://lore.kernel.org/r/20240730193840.2580358-1-mwalle@kernel.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent acabfb1b

drivers/usb/gadget/function/u_serial.c

+22 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/kthread.h>

#include <linux/workqueue.h>

#include <linux/kfifo.h>

#include <linux/serial.h>



#include "u_serial.h"
@@ -126,6 +127,7 @@ struct gs_port { 
	wait_queue_head_t	close_wait;

	bool			suspended;	/* port suspended */

	bool			start_delayed;	/* delay start when suspended */

	struct async_icount	icount;



	/* REVISIT this state ... */

	struct usb_cdc_line_coding port_line_coding;	/* 8-N-1 etc */
@@ -257,6 +259,7 @@ __acquires(&port->port_lock) 
			break;

		}

		do_tty_wake = true;

		port->icount.tx += len;



		req->length = len;

		list_del(&req->list);
@@ -408,6 +411,7 @@ static void gs_rx_push(struct work_struct *work) 
				size -= n;

			}



			port->icount.rx += size;

			count = tty_insert_flip_string(&port->port, packet,

					size);

			if (count)
@@ -851,6 +855,23 @@ static int gs_break_ctl(struct tty_struct *tty, int duration) 
	return status;

}



static int gs_get_icount(struct tty_struct *tty,

			 struct serial_icounter_struct *icount)

{

	struct gs_port *port = tty->driver_data;

	struct async_icount cnow;

	unsigned long flags;



	spin_lock_irqsave(&port->port_lock, flags);

	cnow = port->icount;

	spin_unlock_irqrestore(&port->port_lock, flags);



	icount->rx = cnow.rx;

	icount->tx = cnow.tx;



	return 0;

}



static const struct tty_operations gs_tty_ops = {

	.open =			gs_open,

	.close =		gs_close,
@@ -861,6 +882,7 @@ static const struct tty_operations gs_tty_ops = { 
	.chars_in_buffer =	gs_chars_in_buffer,

	.unthrottle =		gs_unthrottle,

	.break_ctl =		gs_break_ctl,

	.get_icount =		gs_get_icount,

};



/*-------------------------------------------------------------------------*/