1 files changed, 27 insertions, 103 deletions

diff --git a/drivers/usb/serial/omninet.c b/drivers/usb/serial/omninet.c
index dd706953b466..efcd7feed6f4 100644
--- a/drivers/usb/serial/omninet.c
+++ b/drivers/usb/serial/omninet.c
@@ -1,6 +1,8 @@
 /*
  * USB ZyXEL omni.net LCD PLUS driver
  *
+ * Copyright (C) 2013,2017 Johan Hovold <johan@kernel.org>
+ *
  *	This program is free software; you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License version
  *	2 as published by the Free Software Foundation.
@@ -32,12 +34,10 @@
 
 /* function prototypes */
 static void omninet_process_read_urb(struct urb *urb);
-static void omninet_write_bulk_callback(struct urb *urb);
-static int  omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
-				const unsigned char *buf, int count);
-static int  omninet_write_room(struct tty_struct *tty);
-static void omninet_disconnect(struct usb_serial *serial);
-static int omninet_attach(struct usb_serial *serial);
+static int omninet_prepare_write_buffer(struct usb_serial_port *port,
+				void *buf, size_t count);
+static int omninet_calc_num_ports(struct usb_serial *serial,
+				struct usb_serial_endpoints *epds);
 static int omninet_port_probe(struct usb_serial_port *port);
 static int omninet_port_remove(struct usb_serial_port *port);
 
@@ -55,15 +55,12 @@ static struct usb_serial_driver zyxel_omninet_device = {
 	},
 	.description =		"ZyXEL - omni.net lcd plus usb",
 	.id_table =		id_table,
-	.num_ports =		1,
-	.attach =		omninet_attach,
+	.num_bulk_out =		2,
+	.calc_num_ports =	omninet_calc_num_ports,
 	.port_probe =		omninet_port_probe,
 	.port_remove =		omninet_port_remove,
-	.write =		omninet_write,
-	.write_room =		omninet_write_room,
-	.write_bulk_callback =	omninet_write_bulk_callback,
 	.process_read_urb =	omninet_process_read_urb,
-	.disconnect =		omninet_disconnect,
+	.prepare_write_buffer =	omninet_prepare_write_buffer,
 };
 
 static struct usb_serial_driver * const serial_drivers[] = {
@@ -104,15 +101,14 @@ struct omninet_data {
 	__u8	od_outseq;	/* Sequence number for bulk_out URBs */
 };
 
-static int omninet_attach(struct usb_serial *serial)
+static int omninet_calc_num_ports(struct usb_serial *serial,
+					struct usb_serial_endpoints *epds)
 {
-	/* The second bulk-out endpoint is used for writing. */
-	if (serial->num_bulk_out < 2) {
-		dev_err(&serial->interface->dev, "missing endpoints\n");
-		return -ENODEV;
-	}
+	/* We need only the second bulk-out for our single-port device. */
+	epds->bulk_out[0] = epds->bulk_out[1];
+	epds->num_bulk_out = 1;
 
-	return 0;
+	return 1;
 }
 
 static int omninet_port_probe(struct usb_serial_port *port)
@@ -159,96 +155,24 @@ static void omninet_process_read_urb(struct urb *urb)
 	tty_flip_buffer_push(&port->port);
 }
 
-static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
-					const unsigned char *buf, int count)
+static int omninet_prepare_write_buffer(struct usb_serial_port *port,
+					void *buf, size_t count)
 {
-	struct usb_serial *serial = port->serial;
-	struct usb_serial_port *wport = serial->port[1];
-
 	struct omninet_data *od = usb_get_serial_port_data(port);
-	struct omninet_header *header = (struct omninet_header *)
-					wport->write_urb->transfer_buffer;
-
-	int			result;
-
-	if (count == 0) {
-		dev_dbg(&port->dev, "%s - write request of 0 bytes\n", __func__);
-		return 0;
-	}
-
-	if (!test_and_clear_bit(0, &port->write_urbs_free)) {
-		dev_dbg(&port->dev, "%s - already writing\n", __func__);
-		return 0;
-	}
-
-	count = (count > OMNINET_PAYLOADSIZE) ? OMNINET_PAYLOADSIZE : count;
-
-	memcpy(wport->write_urb->transfer_buffer + OMNINET_HEADERLEN,
-								buf, count);
-
-	usb_serial_debug_data(&port->dev, __func__, count,
-			      wport->write_urb->transfer_buffer);
-
-	header->oh_seq 	= od->od_outseq++;
-	header->oh_len 	= count;
-	header->oh_xxx  = 0x03;
-	header->oh_pad 	= 0x00;
-
-	/* send the data out the bulk port, always 64 bytes */
-	wport->write_urb->transfer_buffer_length = OMNINET_BULKOUTSIZE;
-
-	result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
-	if (result) {
-		set_bit(0, &wport->write_urbs_free);
-		dev_err_console(port,
-			"%s - failed submitting write urb, error %d\n",
-			__func__, result);
-	} else
-		result = count;
-
-	return result;
-}
+	struct omninet_header *header = buf;
 
+	count = min_t(size_t, count, OMNINET_PAYLOADSIZE);
 
-static int omninet_write_room(struct tty_struct *tty)
-{
-	struct usb_serial_port *port = tty->driver_data;
-	struct usb_serial 	*serial = port->serial;
-	struct usb_serial_port 	*wport 	= serial->port[1];
-
-	int room = 0; /* Default: no room */
-
-	if (test_bit(0, &wport->write_urbs_free))
-		room = wport->bulk_out_size - OMNINET_HEADERLEN;
-
-	dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
-
-	return room;
-}
-
-static void omninet_write_bulk_callback(struct urb *urb)
-{
-/*	struct omninet_header	*header = (struct omninet_header  *)
-						urb->transfer_buffer; */
-	struct usb_serial_port 	*port   =  urb->context;
-	int status = urb->status;
-
-	set_bit(0, &port->write_urbs_free);
-	if (status) {
-		dev_dbg(&port->dev, "%s - nonzero write bulk status received: %d\n",
-			__func__, status);
-		return;
-	}
+	count = kfifo_out_locked(&port->write_fifo, buf + OMNINET_HEADERLEN,
+			count, &port->lock);
 
-	usb_serial_port_softint(port);
-}
-
-
-static void omninet_disconnect(struct usb_serial *serial)
-{
-	struct usb_serial_port *wport = serial->port[1];
+	header->oh_seq = od->od_outseq++;
+	header->oh_len = count;
+	header->oh_xxx = 0x03;
+	header->oh_pad = 0x00;
 
-	usb_kill_urb(wport->write_urb);
+	/* always 64 bytes */
+	return OMNINET_BULKOUTSIZE;
 }
 
 module_usb_serial_driver(serial_drivers, id_table);