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

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

Signed-off-by: Michael Walle <mwalle@kernel.org>
Link: https://lore.kernel.org/r/20240730193840.2580358-1-mwalle@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Walle
2024-07-30 21:38:40 +02:00
committed by Greg Kroah-Hartman
parent acabfb1b79
commit 4e33059ed5
1 changed files with 22 additions and 0 deletions
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22
drivers/usb/gadget/function/u_serial.c
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@@ -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,
};
/*-------------------------------------------------------------------------*/