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USB: serial: omninet: use generic write implementation

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Now that the endpoint-port mapping has been properly set up during
probe, we can switch to using the more efficient generic write
implementation.

Note that this currently means that chars_in_buffer now overcounts
slightly as we always write a full endpoint-sized packet.

Also add a copyright entry.

Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2017-03-16 17:13:49 +01:00
parent 2dc1071b34
commit d27444152c
1 changed files with 17 additions and 76 deletions
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93
drivers/usb/serial/omninet.c
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@ -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.
@ -32,10 +34,8 @@
/* 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 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);
@ -59,10 +59,8 @@ static struct usb_serial_driver zyxel_omninet_device = {
.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,
.prepare_write_buffer = omninet_prepare_write_buffer,
};
static struct usb_serial_driver * const serial_drivers[] = {
@ -157,81 +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 omninet_data *od = usb_get_serial_port_data(port);
struct omninet_header *header = (struct omninet_header *)
port->write_urb->transfer_buffer;
int result;
struct omninet_header *header = buf;
if (count == 0) {
dev_dbg(&port->dev, "%s - write request of 0 bytes\n", __func__);
return 0;
}
count = min_t(size_t, count, OMNINET_PAYLOADSIZE);
if (!test_and_clear_bit(0, &port->write_urbs_free)) {
dev_dbg(&port->dev, "%s - already writing\n", __func__);
return 0;
}
count = kfifo_out_locked(&port->write_fifo, buf + OMNINET_HEADERLEN,
count, &port->lock);
count = (count > OMNINET_PAYLOADSIZE) ? OMNINET_PAYLOADSIZE : count;
header->oh_seq = od->od_outseq++;
header->oh_len = count;
header->oh_xxx = 0x03;
header->oh_pad = 0x00;
memcpy(port->write_urb->transfer_buffer + OMNINET_HEADERLEN,
buf, count);
usb_serial_debug_data(&port->dev, __func__, count,
port->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 */
port->write_urb->transfer_buffer_length = OMNINET_BULKOUTSIZE;
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (result) {
set_bit(0, &port->write_urbs_free);
dev_err_console(port,
"%s - failed submitting write urb, error %d\n",
__func__, result);
} else
result = count;
return result;
}
static int omninet_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int room = 0; /* Default: no room */
if (test_bit(0, &port->write_urbs_free))
room = port->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;
}
usb_serial_port_softint(port);
/* always 64 bytes */
return OMNINET_BULKOUTSIZE;
}
module_usb_serial_driver(serial_drivers, id_table);