In order for a serial function to add flags to the poll() mask of their
tty files, propagate the poll() callback to the next layer so it can
return a mask if it sees fit to do so.
Signed-off-by: Tal Shorer <tal.shorer@xxxxxxxxx>
---
drivers/usb/gadget/function/u_serial.c | 16 ++++++++++++++++
drivers/usb/gadget/function/u_serial.h | 3 +++
2 files changed, 19 insertions(+)
diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/function/u_serial.c
index 9b0805f..d466f58 100644
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c
@@ -1025,6 +1025,21 @@ static int gs_break_ctl(struct tty_struct *tty, int duration)
return status;
}
+static unsigned int gs_poll(struct tty_struct *tty, struct file *file,
+ poll_table *wait)
+{
+ struct gs_port *port = tty->driver_data;
+ struct gserial *gser;
+ unsigned int mask = 0;
+
+ spin_lock_irq(&port->port_lock);
+ gser = port->port_usb;
+ if (gser && gser->poll)
+ mask |= gser->poll(gser, file, wait);
+ spin_unlock_irq(&port->port_lock);
+ return mask;
+}
+
static const struct tty_operations gs_tty_ops = {
.open = gs_open,
.close = gs_close,
@@ -1035,6 +1050,7 @@ static const struct tty_operations gs_tty_ops = {
.chars_in_buffer = gs_chars_in_buffer,
.unthrottle = gs_unthrottle,
.break_ctl = gs_break_ctl,
+ .poll = gs_poll,
};
/*-------------------------------------------------------------------------*/
diff --git a/drivers/usb/gadget/function/u_serial.h b/drivers/usb/gadget/function/u_serial.h
index c20210c..ce00840 100644
--- a/drivers/usb/gadget/function/u_serial.h
+++ b/drivers/usb/gadget/function/u_serial.h
@@ -12,6 +12,7 @@
#ifndef __U_SERIAL_H
#define __U_SERIAL_H
+#include <linux/poll.h>
#include <linux/usb/composite.h>
#include <linux/usb/cdc.h>
@@ -50,6 +51,8 @@ struct gserial {
void (*connect)(struct gserial *p);
void (*disconnect)(struct gserial *p);
int (*send_break)(struct gserial *p, int duration);
+ unsigned int (*poll)(struct gserial *p, struct file *file,
+ poll_table *wait);
};
/* utilities to allocate/free request and buffer */
--
2.7.4
--
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